Glow Screen timer mod

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Sep 22, 2004
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Driving my BJ74 more this winter than last, and am frustrated by the glow screen timer, which just doesn't go on long enough to ensure a good start.

Considered a Wilson switch like I did on Tippy, but Tippy has become a vehicle that requires a weekend training course to understand all the peculiar mods to operate. So, I started thinking of a mod that the powerstroke boys do... they insert a resistor between the oil pressure sensor and the computer, to give the computer a artificially high oil pressure reading. The theory is that higher Oil Pressure means a cold engine, so the computer advances the injection timing, increasing HP. It's a $0.10 mod that gets 25-30 HP and a few MPG better milage. the really clever people install a resistor pot to have exact control over engine timing!

The Glow screen works the same way. Temp sensor sends a signal (a resistance) to a timer, which runs the glow screen for a time based on that signal. Adding a resistor between the sensor and timer relay could do the same thing, and avoid the need for a Wilson switch, making the whole truck just that much more clean and simple.. possibly more attractive to future buyers, and simpler to lend out to spouses and girlfriends. I believe the engine manual has specs on temp/resistance graphs, which would assist in picking the right resistor.

What say the list? Is this idea a gooder or what?

Peter Straub
 
maybe is a good idea .. for chicks as you say .. :D is the same ( reverse ) idea with a electric fan termo switch when it reach a specific temp, it's allow the electric flow. In this case your termo switch cut the electric flow when reach a specific temp.
 
Behemoth60 said:
Driving my BJ74 more this winter than last, and am frustrated by the glow screen timer, which just doesn't go on long enough to ensure a good start.

Considered a Wilson switch like I did on Tippy, but Tippy has become a vehicle that requires a weekend training course to understand all the peculiar mods to operate. So, I started thinking of a mod that the powerstroke boys do... they insert a resistor between the oil pressure sensor and the computer, to give the computer a artificially high oil pressure reading. The theory is that higher Oil Pressure means a cold engine, so the computer advances the injection timing, increasing HP. It's a $0.10 mod that gets 25-30 HP and a few MPG better milage. the really clever people install a resistor pot to have exact control over engine timing!

The Glow screen works the same way. Temp sensor sends a signal (a resistance) to a timer, which runs the glow screen for a time based on that signal. Adding a resistor between the sensor and timer relay could do the same thing, and avoid the need for a Wilson switch, making the whole truck just that much more clean and simple.. possibly more attractive to future buyers, and simpler to lend out to spouses and girlfriends. I believe the engine manual has specs on temp/resistance graphs, which would assist in picking the right resistor.

What say the list? Is this idea a gooder or what?

Peter Straub

ok, don't put in a resistor, put in a potentiometer or rheostat
and control the glow screen to whatever you find is a better mix. potentiometer is better as it is ajusted with a screw and a rheostat generally is a dial and knob.

but both should work as you say.

Cool mod.
 
Or...you can always just put in a good quality normally closed push button switch inline with the Yellow wire (Pin 7) from your glow screen timer to do the same thing as originally suggested by Stickboy.

The system will remain in stock form when you leave the switch alone and the glow screen will kick on at the temp and duration as determined by the factory. When you depress the switch, the timer sees infinity on Pin 7 (temp sensor) and thinks it's bloody cold outside, and the glow screen comes on for however long you depress that switch for (to the maximum time). You have to depress the switch before moving the ignition to "ON". Here's the link:

https://forum.ih8mud.com/showthread.php?t=24480&highlight=glow+screen
 
Maybe the right thing is to do everything.

N/C mom. button and potentiometer. Use the pot to adjust glow timing. Button for manual over-ride. If you don't do anything, it works at least as well as stock.

Peter Straub
 
I say scrap the whole system and expect visits from the ether bunny. I hot wired the glow screen in Orange a couple of weeks ago and it still sucked to start at -20C. A week later at -18C a quick spray and she jumped to life, first crank.

Someday I'm going to install one of the automatic systems from http://www.koldban.com/mainpages/systems.htm
 
I know of Stones, Petra's, and my trucks that have the mod as defined by Stockboy. I am quite happy with it. Remember too that after releasing the button, the system will then default to the stock setting, in effect increasing the glow time if the tempurature is below the factory settings.

I've not any experience with this mod and the -20 you mention though Bruce...

gb
 
poor Peter, even the LJ78s start with no problem at -20C... without being plugged in.
i would suggest a manual over ride, hold the creen on for 10 seconds and fire away...
 
crushers said:
poor Peter, even the LJ78s start with no problem at -20C... without being plugged in.
i would suggest a manual over ride, hold the creen on for 10 seconds and fire away...


Uh oh...meeeow! :D
 
Waggoner5 said:
Peter, has anyone done the first mod on the oil pressure switch on a 12HT? Sounds like an easy place to regain some lost HP.
Gary

The oil pressure resistor mod is specific to Powerstrokes. You have to do some old school mods on the 12HT to make power instead of trying to trick the computer like on the modern computer controlled engines.

Peter Straub
 
I was going to mention that 12H-Ts don't have computers, but you beat me to it.

Playing with your boost and fuel settings would be a relatively inexpensive and effective way of getting more power out your 12H-T.

:beer:
 
Stone said:
Playing with your boost and fuel settings would be a relatively inexpensive and effective way of getting more power out your 12H-T.

Or tt's. yummy.
 
Has anyone tried shimming the spring on the oil pressure relief valve. We did it on my buddies Supra when we rebuilt the motor. Unfortunately he shimmed it the wrong way and we had a hell of a time getting back at the oil pump after it was in the car. :doh:
 
I'll be doing this little mod as it's a possible solution to my issue of preheating my veggie oil blend when I start up. Never seen the glow screen light come on in Australia - surprise surprise - but overriding the system might just make starting on SVO a bit easier.

Does anyone have an opinion on whether I am likely to damage anything by overriding the standard timer and running the glow screen in warmer weather - 20C - for this purpose?

Thanks
Tim
 
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