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02-26-06, 10:51 PM
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#91 (permalink)
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250+ Club
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Posts: 376
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I've been waiting for a chance to do this same thing with my laptop. After mod, my truck seems to be running a lot cooler than I thought it was, the needle hasn't hit the middle of the gauge yet, although trips have been kinda short.
I'm wondering how consistent the temp readings are between gauges. I'd assume they're pretty darn consistent but what do I know? (Answer: not much apart from how to order some resistors and work a soldering iron).
__________________
-Todd
'97 Land Cruiser 40th Anniversary
'89 Porsche 930
'07 BMW R1200GSA
'96 Toyota T100
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02-26-06, 11:05 PM
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#92 (permalink)
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California Expatriate
Join Date: Oct 2003
Location: Z.O.W.I.E. Headquarters
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I'm curious to see what you read from the ECU as well. I think we might find a lot of variation on temperatures between trucks depending on cooling system health. My gauge seems to be fairly consistent with RavenTai's experiments and observations.
Todd, what kind of ambient temperatures have you been driving in?
__________________
'97 LandCruiser (Slee bits with OME418 and SOF4RH springs; Slee step sliders; African Outback full length roof rack; ARB front bumper, Hella 4000s; Kaymar rear bumper, tire carrier, jerry can carrier; BFG AT 315/75/16 on OEM steelies)
'09 WRX STi
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02-26-06, 11:09 PM
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#93 (permalink)
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Mid 60s to mid 70s. I haven't done more than a few freeway miles, mostly LA surface street traffic. I also did a full back- forward- and sideways flush on the cooling system not 6 months (and less than 5000 miles) ago so my cooling system should be in pretty good health.
Nothing like having slighty divergent results to make one quesiton one's soldering skills!
__________________
-Todd
'97 Land Cruiser 40th Anniversary
'89 Porsche 930
'07 BMW R1200GSA
'96 Toyota T100
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02-27-06, 10:59 AM
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#94 (permalink)
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California Expatriate
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Quote:
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Originally Posted by tiorio
Mid 60s to mid 70s. I haven't done more than a few freeway miles, mostly LA surface street traffic. I also did a full back- forward- and sideways flush on the cooling system not 6 months (and less than 5000 miles) ago so my cooling system should be in pretty good health.
Nothing like having slighty divergent results to make one quesiton one's soldering skills!
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It looks like your ambient temperatures are the same or slightly higher than mine. The more I think about it the more I'd love to see what temperatures your ECU is reading.
__________________
'97 LandCruiser (Slee bits with OME418 and SOF4RH springs; Slee step sliders; African Outback full length roof rack; ARB front bumper, Hella 4000s; Kaymar rear bumper, tire carrier, jerry can carrier; BFG AT 315/75/16 on OEM steelies)
'09 WRX STi
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03-01-06, 08:46 PM
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#95 (permalink)
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ΜΟΛΩΝ ΛΑΒΕ
Join Date: Nov 2003
Location: Miami FL
Posts: 5,657
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This is good stuff, thanks for the ECM comparison
The bottom of the red mark is suppose to be 217, I would be bummed if it did wind up being 212. I tried to be as accurate as possible in designing the test bed, I could accept a degree or two variation from the test bed to the real engine but not 5. Do you think it could make that 5 degrees in the space left? When I called bottom of red @ 217 that was the line forming bottom of the red at the center of the needle. See attached,
Also due to the height of the needle off the face of the gauge there is some parallax error, reading vary with viewing angle. Nothing can be done about this, in the test bed the camera was set to perpendicular to the face of the gauge. The other variable is gauge to gauge variation, I would hope that they are consistent being a near Wheatstone bridge it has the potential to be accurate and consistent, time and what they are exposed to could effect things also.
My main goal in this mod was for us to have an inexpensive reasonably accurate troubleshooting and monitoring tool, we may be getting to some early results here.
I am hesitant to make the mod less sensitive. If we are seeing actual problems even if they are minor, fix the problem not the symptom, 217 is 32F above thermostat opening temp, but if we are seeing consistent hits into high needle positions on many vehicles that are otherwise good then maybe I should look into it but not any time soon. Have other things that need to come first, Will have to see what happens as summer approaches.
In general my needle stays at or near the middle at highway speeds. long acceleration can get it to pop up a bit (200 or so) but not near the red mark, I ran a early version of the mod near the end of summer on a trip to FL, it was hot and never got that close to the red mark even with a more sensitive early version of the mod. Mine seams more to rise up at low speeds where airflow is less,
Could I talk you into pulling the lights and retesting? Could they be restricting flow airflow to much? Possibly combined with some other minor cooling efficiency problems?
Tiorio at the other end of the scale, have you done any non short trips at all yet? The last bit of warming up is slow, takes over 10 miles or more to finally hit the middle.
__________________
1988 FJ62 on 33s
1996 LX450 on 33s
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03-02-06, 10:53 AM
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#96 (permalink)
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250+ Club
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I'm doing a couple hours freeway tonight. Depending on the hour when I leave I'll try to hook up the laptop for a portion of the trip and get some data from the ECU as well.
__________________
-Todd
'97 Land Cruiser 40th Anniversary
'89 Porsche 930
'07 BMW R1200GSA
'96 Toyota T100
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03-02-06, 02:29 PM
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#97 (permalink)
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California Expatriate
Join Date: Oct 2003
Location: Z.O.W.I.E. Headquarters
Posts: 1,874
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Quote:
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Originally Posted by RavenTai
This is good stuff, thanks for the ECM comparison
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My pleasure. This mod is starting to suck me in. I wish I had found the thread about it while the testing was going on.
Quote:
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The bottom of the red mark is suppose to be 217, I would be bummed if it did wind up being 212. I tried to be as accurate as possible in designing the test bed, I could accept a degree or two variation from the test bed to the real engine but not 5. Do you think it could make that 5 degrees in the space left? When I called bottom of red @ 217 that was the line forming bottom of the red at the center of the needle. See attached,
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If that is what you meant by bottom of red then I think that yes, it should make the 5 degrees with the space left. I think 212 will be just when the top of the needle touches the red line. From my limited experience it's about 5 degrees a needle width (give or take).
Quote:
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Could I talk you into pulling the lights and retesting? Could they be restricting flow airflow to much? Possibly combined with some other minor cooling efficiency problems?
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This is a good idea. I'll probably try it this weekend. I'm starting to think I have some cooling issues (big surprise there). My truck definitely gets hotter with higher mphs. Slow speed (35-40) driving seems to be fine with the gauge in the center.
__________________
'97 LandCruiser (Slee bits with OME418 and SOF4RH springs; Slee step sliders; African Outback full length roof rack; ARB front bumper, Hella 4000s; Kaymar rear bumper, tire carrier, jerry can carrier; BFG AT 315/75/16 on OEM steelies)
'09 WRX STi
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03-06-06, 02:41 PM
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#98 (permalink)
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250+ Club
Join Date: Mar 2003
Location: Tinley Park, IL
Posts: 390
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I know this might be a bit off topic, but anyone have any resistors layin around? I'd much rather give you guys 5$ for 2 little resistors, then some company who wants like 8$ to ship a gram worth of parts...
__________________
'95 Cruiser, locked, emu'ed, arb'd & BFG'd / '91 MR2 Turbo
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03-06-06, 02:50 PM
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#99 (permalink)
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250+ Club
Join Date: Apr 2003
Posts: 376
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Quote:
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Originally Posted by tiorio
I'm doing a couple hours freeway tonight. Depending on the hour when I leave I'll try to hook up the laptop for a portion of the trip and get some data from the ECU as well.
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Well, I ended up hitting the road shortly before midnight, with wife and half-alseep/half-screaming 2-yr old so me plugging the laptop in was not a priority nor well-advised distraction.
Will try to get ECU temps this week and post 'em up!
__________________
-Todd
'97 Land Cruiser 40th Anniversary
'89 Porsche 930
'07 BMW R1200GSA
'96 Toyota T100
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03-06-06, 03:37 PM
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#100 (permalink)
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Forum Lifer
Join Date: Dec 2003
Location: Knoxville
Posts: 2,532
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Quote:
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Originally Posted by Mr.Bryan
I know this might be a bit off topic, but anyone have any resistors layin around? I'd much rather give you guys 5$ for 2 little resistors, then some company who wants like 8$ to ship a gram worth of parts...
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Yep, I bought two extras. I'll PM you if you still want them.

Rookie2
__________________
1997 LX-450, Basically stock.
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03-06-06, 08:48 PM
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#101 (permalink)
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Forum Lifer
Join Date: Aug 2003
Location: Tijeras, NM
Posts: 4,577
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Quote:
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Originally Posted by Mr.Bryan
I know this might be a bit off topic, but anyone have any resistors layin around? I'd much rather give you guys 5$ for 2 little resistors, then some company who wants like 8$ to ship a gram worth of parts...
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Bryan,
I have two sets of extra resistors so let me know. If you're home from school any time soon, bring $5 to the house!
Later,
Ali
__________________
'96 his
'97 hers
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03-15-06, 12:28 AM
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#102 (permalink)
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ΜΟΛΩΝ ΛΑΒΕ
Join Date: Nov 2003
Location: Miami FL
Posts: 5,657
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did some testing on the 93 gauge and to let you guys know the mod is in fact the same for the 93-94 gauges.
there was a few degrees diffrence here and there but close enough IMO, you can read the details starting arround post # 313
http://forum.ih8mud.com/80-series-tech/53142-adding-coolant-temp-gauge.html
__________________
1988 FJ62 on 33s
1996 LX450 on 33s
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03-15-06, 06:53 AM
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#103 (permalink)
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Forum Lifer
Join Date: Aug 2003
Location: Tijeras, NM
Posts: 4,577
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Another satisfied 80 owner with this mod. Thanks Raven!!
Ali
__________________
'96 his
'97 hers
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03-15-06, 08:08 AM
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#104 (permalink)
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Forum Lifer
Join Date: Dec 2003
Location: Knoxville
Posts: 2,532
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You can add Mr. Bryan to the list too. He did both the temp guage and the auto window up mod last week in like 8 minutes.

Rookie2
__________________
1997 LX-450, Basically stock.
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03-17-06, 12:01 PM
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#105 (permalink)
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250+ Club
Join Date: Apr 2003
Posts: 376
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Quote:
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Originally Posted by Darwood
It looks like your ambient temperatures are the same or slightly higher than mine. The more I think about it the more I'd love to see what temperatures your ECU is reading. 
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Finally got around to do at least a quick test today. Hooked up the OBD-II (AutoEnginuity ScanTool) and made a 15 min or so run. Here's what I found:
Needle parallel to white line on bottom of gauge, ECU says ~150F
Needle approx. 1/3 between white line and red line on gauge, ECU says ~174-178F
My temp maxed at 181, ambient temps mid 50s, stop-and-go driving. I'm fairly close the the range indicated. There are individual sensors for the ECU and the gauge, no? I forget...
__________________
-Todd
'97 Land Cruiser 40th Anniversary
'89 Porsche 930
'07 BMW R1200GSA
'96 Toyota T100
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03-17-06, 01:24 PM
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#106 (permalink)
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The quick brown fox .....
Join Date: Mar 2003
Location: Somewhere in the foothills...
Posts: 11,845
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Quote:
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Originally Posted by tiorio
There are individual sensors for the ECU and the gauge, no? I forget...
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There are 3 stock temp sensors; A/C shutoff, ECU, and dash gauge. Some of us have added a fourth.
-B-
__________________
97 FZJ80 - Locked, 315 Toyos, 4.88s, Slee 4", George's sliders, Slee bumpers, Warn M12000, OBA, Yaesu 7800, Outback drawers + other stuff. Transformation complete.
Sometimes you find yourself in the middle of nowhere. And sometimes in the middle of nowhere, you find yourself.
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03-18-06, 12:30 AM
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#107 (permalink)
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ΜΟΛΩΝ ΛΑΒΕ
Join Date: Nov 2003
Location: Miami FL
Posts: 5,657
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Quote:
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Originally Posted by Rookie2
You can add Mr. Bryan to the list too. He did both the temp guage and the auto window up mod last week in like 8 minutes.

Rookie2
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Cool is that 10 total now?
Quote:
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Originally Posted by tiorio
Finally got around to do at least a quick test today. Hooked up the OBD-II (AutoEnginuity ScanTool) and made a 15 min or so run. Here's what I found:
Needle parallel to white line on bottom of gauge, ECU says ~150F
Needle approx. 1/3 between white line and red line on gauge, ECU says ~174-178F
My temp maxed at 181, ambient temps mid 50s, stop-and-go driving. I'm fairly close the the range indicated. There are individual sensors for the ECU and the gauge, no? I forget...
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So your gauge has been reading low since the mod correct? If you are maxing out at 181f that would fit, the gauge is suppose to center around 189 and this seams to be a pretty good center for most of us, yours seams to be running a bit cooler.
Thermosat Specs per the FSM
Valve opening temperature: 80 – 84°C (176 – 183°F)
Valve lift: 10 mm (0.39 in.) or more at 95°C (203°F)
Depends on how you look at it, it is suppose to crack open at about 179.6 I do not think that if yours was opening at 179 it would only be at 181 by the time it got to the end of the head (where the sensors are) I think your thermostat may be opening early probably not a big deal and maybe not worth futzing over, close enough and on the good side.
Have you replaced your thermostat yet? Was it OEM?
Like B said there are separate senders for the ECU and gauge, they both seam to agree that you are running cooler than most.
__________________
1988 FJ62 on 33s
1996 LX450 on 33s
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03-19-06, 09:55 AM
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#108 (permalink)
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250+ Club
Join Date: Apr 2003
Posts: 376
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Quote:
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Originally Posted by RavenTai
So your gauge has been reading low since the mod correct? If you are maxing out at 181f that would fit, the gauge is suppose to center around 189 and this seams to be a pretty good center for most of us, yours seams to be running a bit cooler.
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The truck has been running this way since the mod, the gauge vs. ECU readings have also been consistent.
Quote:
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Originally Posted by RavenTai
Thermosat Specs per the FSM
Valve opening temperature: 80 – 84°C (176 – 183°F)
Valve lift: 10 mm (0.39 in.) or more at 95°C (203°F)
Depends on how you look at it, it is suppose to crack open at about 179.6 I do not think that if yours was opening at 179 it would only be at 181 by the time it got to the end of the head (where the sensors are) I think your thermostat may be opening early probably not a big deal and maybe not worth futzing over, close enough and on the good side.
Have you replaced your thermostat yet? Was it OEM?
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I completely flushed my cooling system (back and forward, maybe sideways too) and replaced thermostat, fan clutch, couple of hoses, and filled with distilled/toyota red some 2000 miles ago, and had a quick partial drain/refill when I r&r'd the PHH a couple weeks ago.
I would not be surprised that I am running at the cool temp I am, but it does seem that my gauge position is lower by ~10F at the same actual temp as other modders. So I think the gauge is accurate, but my range is 140 (pegged cold) to prolly 234 (pegged hot) by extrapolation. Accurate enough for me, but an interesting variation nonetheless!
Either way, I'm VERY HAPPY with this mod, thanks to all who contributed!
__________________
-Todd
'97 Land Cruiser 40th Anniversary
'89 Porsche 930
'07 BMW R1200GSA
'96 Toyota T100
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04-12-06, 06:27 AM
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#109 (permalink)
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No charge for awesomeness
Join Date: Dec 2005
Location: Naper-vile, IL
Posts: 267
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Did the mod yesterday with a little help from a friend who used to do aviation electrics for the navy. It was really pretty simple. I look forward to getting my truck put back together to see the results. Thanks RT.
__________________
94- Gray with cloth, 150K mi, pretty much stock, , no running boards, and no lockers
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04-12-06, 09:47 AM
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#110 (permalink)
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Forum Regular
Join Date: Apr 2005
Location: Bellbrook, OH
Posts: 111
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did mod a month ago. runs consistently at parallel to the horizon almost all the time. no data on OBD temp or such- sorry.
__________________
'97 LC w/ 143k. Unlocked, fake wood, oem tires. (temp g. mod, breather mod, r.rack pads/seal, egr bypass) whoopee.
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04-12-06, 05:18 PM
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#111 (permalink)
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ΜΟΛΩΝ ΛΑΒΕ
Join Date: Nov 2003
Location: Miami FL
Posts: 5,657
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Mods # 11 & 12
good deal.
mine has beeen doing the same as before, near level most times, pops up a bit with extended idle time, especially with the AC on.
__________________
1988 FJ62 on 33s
1996 LX450 on 33s
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04-12-06, 11:52 PM
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#112 (permalink)
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northerner
Join Date: Mar 2003
Location: north of 49
Posts: 4,230
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anyone got an extra set of resisters they want to sell? my truck is finally running so I want to do the mod gauge before the end of the month when i have a long road trip.
__________________
93 fzj80
66 fj40L
m101cdn trailer
91 LS400 sedancruiser
64, 2x65 honda ct 200
67, 2x68, 3x69, 72, 75 Honda ct90
83 Honda ct70
48 Ferguson TE20
"Diplomacy is the art of having someone else impose your will on you" Lester Pearson
"I have the conch" Piggy
wfc 4812-2635-4880
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04-13-06, 07:02 AM
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#113 (permalink)
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ΜΟΛΩΝ ΛΑΒΕ
Join Date: Nov 2003
Location: Miami FL
Posts: 5,657
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there was a pair of resistors in the box,
have you not recieved your package?
__________________
1988 FJ62 on 33s
1996 LX450 on 33s
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04-13-06, 07:03 AM
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#114 (permalink)
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ΜΟΛΩΝ ΛΑΒΕ
Join Date: Nov 2003
Location: Miami FL
Posts: 5,657
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there was a pair of resistors in the box,
have you not recieved your package?
__________________
1988 FJ62 on 33s
1996 LX450 on 33s
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04-13-06, 09:22 AM
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#115 (permalink)
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northerner
Join Date: Mar 2003
Location: north of 49
Posts: 4,230
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no sir. when did you send it??
__________________
93 fzj80
66 fj40L
m101cdn trailer
91 LS400 sedancruiser
64, 2x65 honda ct 200
67, 2x68, 3x69, 72, 75 Honda ct90
83 Honda ct70
48 Ferguson TE20
"Diplomacy is the art of having someone else impose your will on you" Lester Pearson
"I have the conch" Piggy
wfc 4812-2635-4880
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04-16-06, 05:07 PM
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#116 (permalink)
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northerner
Join Date: Mar 2003
Location: north of 49
Posts: 4,230
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ok add me to the list. many thanks RT, I got it and was already to mod it when the penny finally dropped and i realized it was already modded
turns out I am running 2 or 3 needle widths above the middle line so I am very glad I got it  now to figure out why.
incidentily, I noticed that when I turned it off then turned it back on to ign without restarting, the needle did not return to the spot it was before, nor when I restarted it right after. It seemed to drop a needle width or so. is there any memory factor on these gauges?
__________________
93 fzj80
66 fj40L
m101cdn trailer
91 LS400 sedancruiser
64, 2x65 honda ct 200
67, 2x68, 3x69, 72, 75 Honda ct90
83 Honda ct70
48 Ferguson TE20
"Diplomacy is the art of having someone else impose your will on you" Lester Pearson
"I have the conch" Piggy
wfc 4812-2635-4880
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04-18-06, 12:19 PM
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#117 (permalink)
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California Expatriate
Join Date: Oct 2003
Location: Z.O.W.I.E. Headquarters
Posts: 1,874
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Quote:
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Originally Posted by semlin
ok add me to the list. many thanks RT, I got it and was already to mod it when the penny finally dropped and i realized it was already modded
turns out I am running 2 or 3 needle widths above the middle line so I am very glad I got it  now to figure out why.
incidentily, I noticed that when I turned it off then turned it back on to ign without restarting, the needle did not return to the spot it was before, nor when I restarted it right after. It seemed to drop a needle width or so. is there any memory factor on these gauges?
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I think the reason the gauge doesn't go back to the same spot is due to the input voltage. Without starting the motor your voltage will be about 12.7 volts instead of 14.4 volts when running. Going by Raven's experiments and some of my calculations, the input voltage will effect how the gauge reads.
Semlin, try to get an OBDII scanner on there if you can to read what temperature the ECU thinks it is. Also how old is your radiator and is there any crud in it? I don't recall if you replaced it when you did your head gasket.
__________________
'97 LandCruiser (Slee bits with OME418 and SOF4RH springs; Slee step sliders; African Outback full length roof rack; ARB front bumper, Hella 4000s; Kaymar rear bumper, tire carrier, jerry can carrier; BFG AT 315/75/16 on OEM steelies)
'09 WRX STi
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04-18-06, 03:17 PM
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#118 (permalink)
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The quick brown fox .....
Join Date: Mar 2003
Location: Somewhere in the foothills...
Posts: 11,845
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Quote:
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Originally Posted by Darwood
Semlin, try to get an OBDII scanner on there if you can to read what temperature the ECU thinks it is.
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That will be a neat trick on his '93.
-B-
__________________
97 FZJ80 - Locked, 315 Toyos, 4.88s, Slee 4", George's sliders, Slee bumpers, Warn M12000, OBA, Yaesu 7800, Outback drawers + other stuff. Transformation complete.
Sometimes you find yourself in the middle of nowhere. And sometimes in the middle of nowhere, you find yourself.
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04-18-06, 03:29 PM
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#119 (permalink)
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California Expatriate
Join Date: Oct 2003
Location: Z.O.W.I.E. Headquarters
Posts: 1,874
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Quote:
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Originally Posted by Beowulf
That will be a neat trick on his '93.
-B-
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Hehe you are right. I'm retarded.
I just naturally assume everyone has the magnificent OBDII on their trucks like me.
__________________
'97 LandCruiser (Slee bits with OME418 and SOF4RH springs; Slee step sliders; African Outback full length roof rack; ARB front bumper, Hella 4000s; Kaymar rear bumper, tire carrier, jerry can carrier; BFG AT 315/75/16 on OEM steelies)
'09 WRX STi
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04-18-06, 09:36 PM
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#120 (permalink)
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ΜΟΛΩΝ ΛΑΒΕ
Join Date: Nov 2003
Location: Miami FL
Posts: 5,657
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Semlin you are the lucky #13
The gauge is slightly voltage sensitive at the extremes, it is not affected around the middle, engine on you should have 14.x volts and this is where it is considered most accurate, be aware the coolant temps raises quickly for a few minutes when you shut down, the head is still hot but no coolant circulates so the coolant in the head (where the sensor is) goes up, as soon as you start again the temperature will decrease rapidly.
There are several that report slightly elevated temperatures, so far no major overheats recorded by the gauge that I have heard of, the temps are not excessively high witch brings up the question does your truck need work or not? I am in the same spot, why is it some get a dead steady needle? what is wrong with our trucks that they are not? I have done all fo the PM except for a new radiator.
One of the neat things about the gauge mod will be when the first one of us starts tinkering and finding out what actually helps as you will have direct feedback on what works and what does not.
So who is going to be the first one to plunk down several hundred for a new 93/94 rad?
one thing I am considering right now is a 65/35 water/coolant mix to see if that helps any, I will loose some freeze protection but I do not need much, it rarely gets below the teens here, below 0 F is a once in a lifetime thing
__________________
1988 FJ62 on 33s
1996 LX450 on 33s
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