- Joined
- Jul 20, 2004
- Threads
- 274
- Messages
- 23,205
- Location
- Chandler, AZ
- Website
- www.tontorecreationalliance.org
:whoops: The pic.
Pull any hill at 65mph in an 80 series - Video
- Thread starter LandCruiserPhil
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
I thought I read somewhere that Toyota designs and regularly tests its motors to run at redline for hours on end. Someone here on MUD I am sure can provide the history and correct me as necessary. Assuming this to be so, my point here for bringing this up is that running around 4100 rpm for a several minutes should be absolutely cake for these motors if they are in normal shape (decent temp, history, oil quality, etc.).
I drove mine similarly yesterday (hot day, long hills, AC cranked, heavy load -- sans trailer though), but did not stick it in second gear (since I was not quite at full throttle). I hit a water temp spike of 204 deg.F. on the scan gauge. After lots of cooling system PM over the last several months, I will experiment back and forth with climbing in second to see if the higher rpm lowers the temp a bit. Might just mod my blue fan clutch too, since I will start towing a 1000# trailer soon.
Thanks LandCruiserPhil.
Any idea on what the oil temps are reaching on these long high rpm hills?
After moving to CO and switching to 5w40 M1 with lots of these type of driving i will probably to an oil analysis at 10k just to see how she's liking the changes.
After moving to CO and switching to 5w40 M1 with lots of these type of driving i will probably to an oil analysis at 10k just to see how she's liking the changes.
Yup, I have pulled my tent trailer up both sides, I hate the east approach. I can do about 30-40 mph going west and going east I can barely hold 25. I get about 9 mpg all around pulling the trailer so I imagine it's at 5 mpg or under up both sides of the tunnel.
These trucks are worthless pulling at that altitude and grade, but they do everything else oh so well.
Hmmm, vewwy intuhwesting... I've never thought of driving the 1FZ like this. It totally makes sense. Living in the CO mountains can be a real bitch in one of these. Like others have said, Eisenhower and Vail passes(especially eastbound) kill the trucks power/momentum. I'll be towing a pop up soon, so I'll give this a try and report back...
you forgot to mention your fuel gauge is broken. I noticed it was on full throughout the entire video..
a
a
- Joined
- Jul 20, 2004
- Threads
- 274
- Messages
- 23,205
- Location
- Chandler, AZ
- Website
- www.tontorecreationalliance.org
The oils system is very well designed. Oil spray nozzles in the rods, block, etc, lots of oil movement for good lube and heat absorption, then an oil to coolant heat exchanger. So if there were excessive oil heating, it would be seen in the coolant temp.
- Thread starter
- #28
Watch the video again only 24miles on a fresh tank.
Seriously it seems you use less fuel when running the hills at high rpm then lugging it at lower speeds.
would running at higher rpms for a given road speed increase ATF temps though?
My ATF temps already do undergo a proportionally higher temp rises when towing than the coolant temps.
Might do an experiment on a hill nearby sometime.
My ATF temps already do undergo a proportionally higher temp rises when towing than the coolant temps.
Might do an experiment on a hill nearby sometime.
Watch the video again only 24miles on a fresh tank.
Seriously it seems you use less fuel when running the hills at high rpm then lugging it at lower speeds.
yeah, and from towing big 30'+ boats thousands of miles cross country (not with the 80) it's better for the transmission to provide it with more power than to lug it down..
hell, I downshift to 3rd on the hills in Houston, and it's pretty much flat here, for that matter I keep it in 3rd under 45..
A
The torque curve shows it all. Higher rpms are kinder to everything from the engine to the tranny. I would like to see tranny temps logged on the same climb.I know when I tow my boat over the Cascades my truck just feels right when I'm doing 60-62 in 2nd. There's no data behind that, just seat of the pants feel. That's somewhere around 3600 rpm, I think. Third makes it bog and takes a lot more pedal. I'm not sure why so many are afraid of higher rpms.
- Thread starter
- #32
I have found in our 100 (same trans as the 80) higher rpm results in cooler trans temp. We have a 7% hill coming out of the lake and run our 100 at almost 4K pulling the boat (5k#) and everything stays under 200°.
The hottest trans temps I see pulling is in OD at 55mph on flat road. Never do I see over 200° water temps in the 100. Now I never run OD boat towing but I rarely go over 60mph.
I have a trans temp meter for the 80 on order and should be here any day.
Probably because it makes the ~15-year-old engine scream and gives the impression you're thrashing it. You can just imagine the unknown weakest component trying to keep up. Also people think certain repairs are just an unknown number of engine revs away. Higher RPMs brings them near.
I don't exactly like squeezing all I can out of 2nd gear. But it's a more effective way to drive the mountains. Lugging the engine doesn't do it any favors, I know that. I guess if you're really concerned about breaking something, it's better to just avoid mountains altogether. But after this last weekend, I have a lot more confidence in my Land Cruiser. It did great. Also, being able to see the true engine temperature helps a lot.
http://www.google.com/url?sa=t&rct=...woCwCA&usg=AFQjCNF3uFfjmsNQ5S0iXqTfwTgWKCjRdw
Steepest grade in Colorado is Slumgullion.
West side of Teton pass has a 10% grade. There is a worse one over on the west side of the Bighorns on 14A.
http://www.google.com/url?sa=t&rct=...xYCgCg&usg=AFQjCNGxawDZ5p-5A0vr-UCTb0-mWg2XvA
But the Arizona grades are tough ones fellas. The heat is killer.
For all of these passes, I just put in 2nd and run it at 50mph. These passes are hairy enough that people shouldn't be going any faster anyway.
Steepest grade in Colorado is Slumgullion.
West side of Teton pass has a 10% grade. There is a worse one over on the west side of the Bighorns on 14A.
http://www.google.com/url?sa=t&rct=...xYCgCg&usg=AFQjCNGxawDZ5p-5A0vr-UCTb0-mWg2XvA
But the Arizona grades are tough ones fellas. The heat is killer.
For all of these passes, I just put in 2nd and run it at 50mph. These passes are hairy enough that people shouldn't be going any faster anyway.
I was going to mention teton pass as well; With 3 people in the cruiser on Teton Pass there were sections when I couldn't even hold speed in 2nd gear at WOT. That is a hell of a pass. I'm jealous that you could go 50. Good thing the skiing is excellent and driving slow just gives time to scope out the skiing
I am shocked so many people are afraid of revving over 3k or higher. Wow. This is the only way to really drive over a long ascent, gear hunting is annoying and likely more wear on the motor & tranny. To me, gear hunting is pretty dangerous.
Avoiding the mountains? You cereal? I fully expect the 1FZ to take this type of driving for long grades.
I hope everyone realizes that when going down the mountain, you should be putting that thing in a lower gear too to minimize the use of brakes.
Avoiding the mountains? You cereal? I fully expect the 1FZ to take this type of driving for long grades.
I hope everyone realizes that when going down the mountain, you should be putting that thing in a lower gear too to minimize the use of brakes.
My daughter doesnt want to take her 80 over 4K for any real length of time and then complains how slow she is going up the passes following me.
I did this in my 80 over the mtn passes, then got a heavty trailer and that changed the equation. The SC was the equalizer, but that also runs much hotter.
I always hate going east on Vail as its the harder trek and a lot of times is snowing when I go over it. Sometimes in the summer depending on where I am coming back from, I take Shrine pass, but thats a fire road for practical purposes and not doing 65 there'
Don't worry . be ha.. oh crap!
I did this in my 80 over the mtn passes, then got a heavty trailer and that changed the equation. The SC was the equalizer, but that also runs much hotter.
I always hate going east on Vail as its the harder trek and a lot of times is snowing when I go over it. Sometimes in the summer depending on where I am coming back from, I take Shrine pass, but thats a fire road for practical purposes and not doing 65 there'
Don't worry . be ha.. oh crap!
Maximum efficiency for an engine is between the torque and horsepower peak, in this case, 3000-4600. The engine is designed to redline at 5200 rpm. Why someone would artificially limit the engine to below its torque peak, much less its horsepower peak, is beyond me.
To give a comparison, lets look at the piston speed, as high piston speeds are what will normally destroy or cause premature wear of an engine. The maximum piston speed of the 1fze is 3241 feet per minute at the redline of 5200. The general rule when building high performance engines is keep the max piston speed under 4000 feet per second and under 3500 feet per second for engines designed for a long life. (the numbers are higher on newer engines with lighter pistons, but that is a different story). Here, even at redline, we are well below the limit.
As a comparison, lets look an engine designed to run under heavy load for long periods, a Mercruiser 502. The 502 has a maximum piston speed of 3346 at 5000 rpm's and designed to be run between 4600 and 5000 rpms at full throttle for extended periods. If you were to run a boat with this engine at only less than 3000 rpm's, you would never go anywhere.
The bottom line is you will not harm the engine climbing grades at 4500-5000 rpms. You are doing it for a limited time relative to where the engine normally runs. In my case, I do it every time I go up highway 80 from Truckee to Donner Summit in the Sierra's. It starts at 5500 feet and climbs to 7250 feet. I climb most of it in second gear at 65mph, which is about 4800 rpm's in my truck.
To give a comparison, lets look at the piston speed, as high piston speeds are what will normally destroy or cause premature wear of an engine. The maximum piston speed of the 1fze is 3241 feet per minute at the redline of 5200. The general rule when building high performance engines is keep the max piston speed under 4000 feet per second and under 3500 feet per second for engines designed for a long life. (the numbers are higher on newer engines with lighter pistons, but that is a different story). Here, even at redline, we are well below the limit.
As a comparison, lets look an engine designed to run under heavy load for long periods, a Mercruiser 502. The 502 has a maximum piston speed of 3346 at 5000 rpm's and designed to be run between 4600 and 5000 rpms at full throttle for extended periods. If you were to run a boat with this engine at only less than 3000 rpm's, you would never go anywhere.
The bottom line is you will not harm the engine climbing grades at 4500-5000 rpms. You are doing it for a limited time relative to where the engine normally runs. In my case, I do it every time I go up highway 80 from Truckee to Donner Summit in the Sierra's. It starts at 5500 feet and climbs to 7250 feet. I climb most of it in second gear at 65mph, which is about 4800 rpm's in my truck.
This is similar to how I climb Mauna Kea access road here in Hawaii, elevation goes from 4,450 to 13,796 in only 11.7 miles. I always try to keep the RPMs between 3000 and 3500.
I plan to have an accurate temp gauge before next winter snow season. should be interesting to see the temp difference at different RPMs
I plan to have an accurate temp gauge before next winter snow season. should be interesting to see the temp difference at different RPMs
