2 wheel dyno results...

[SHAGGY101]

At the beginning of this month I finally got around to running a dyno test on my cruiser. The only engine mods it has are the headers. I have baselined everything (cleaning throttle body, synthetic fluids all around, etc...). It is a 2 wheel dyno so it may not be the most accurate. I was meaning to do a dyno run before the headers went on but it did not fit into the schedule at that time. I did three runs using just the normal automatic transmission shifting starting from 25 mph and ending at about 80 mph and another three runs with the AT shifted in 2nd and with the 2nd start on. All runs were VERY consistent and meshed together perfectly. Let me know if you have any questions about the test or anything.

1st pic: dropped drive shaft
2nd pic: hot wired diagnostic port to disable a-trac (thanks for those who helped me with that)
3rd pic: the dash lights after diagnostic port was hotwired

sorry for the crappy pics, camera did not like the -40* weather!

 

[SHAGGY101]

1st pic: RPM reader. Consisted of a laser with a piece of reflective tape on the crank shaft

2nd pic: truck on dyno

 

[SHAGGY101]

I am running office 2010. Let me know if you need me to dumb the files down . I was very surprised to see that I could hit 65 mph in 2nd! Also, there was some spikes in the data due to the torque converter which game larger toques and Hp curves that were erroneous. These along with down shift curves were deleted/ excluded from the given data. Also, some of the data was "beautified" due to the fact that some values were within a tenth or so of each other and the more consistent number was chosen. If you have no idea what I just said, don't worry about it. Let me know if you have any questions.

 

[SHAGGY101]

Sorry, the excel files did not work, here are some screen shots of the charts. Enjoy!

 

[pman]

I this is a little old and off topics, but.....


what did hotwiring the diagnostic port accomplish? Disable ABS and ATRAC?

 

[tarmacblack]

FWIW here is a dyno run from my stock 98 LC in 2wd:

 

[mechanixhorseman]

The hp seems a little underwhelming considering the economy these things get, but I guess that's the price you pay for reliability. I think the torque makes up for it though.

 

[OregonLC]

Keep in mind you can't directly measure hp. You only can measure torque. hp is torque at rpm. So the low hp is indicative of a torque curve optimized for lower RPM's. I don't know that it's necessarily a reliability vs hp problem as much as it is a small V8 in a medium-duty truck platform problem! Also keep in mind that the dyno is measured at the wheel, so all drive line losses need to be added back in to 'true it up' to comparative numbers published by the manufacturers (who measure torque at the crank).

 

[mechanixhorseman]

I believe there is at least some correlation between reliability and power. That's just one of the commandments of automotive design. Toyota could have got close to 300hp easily to the crank from a 4.7l engine if they sacrificed a few aspects of the design. I don't think it's a bad design, in fact its an awesome engine. Toyota designed not only the engine, but the entire vehicle to be insanely reliable. It's not efficient and its not fast, but with it's torque and gearing it's still pretty beastly, while maintaining it's bullet-proof status.

The platform shouldn't matter terribly much on a dyno, especially a 2-wheel dyno. Most people tend to consider wheel hp the only real measurement of power. Maybe one day the manufacturers will get on board and start advertising power as a measurement from the wheels as well.

 

[1loudLX]

my 4.3L 3UZ puts out 294hp.

 

[mechanixhorseman]

my 4.3L 3UZ puts out 294hp.

My 3.5L N54 puts 400 to the wheels (with tune/methanol)

I also wouldn't put that engine in my LC and drive it 100 miles from civilization. Powerful, efficient, but not reliable enough to leave my life in its hands.

 

[SHAGGY101]

I this is a little old and off topics, but.....


what did hotwiring the diagnostic port accomplish? Disable ABS and ATRAC?

Yep, it is to disable the a-trac system. It tells you which ports to bridge in the FSM in order to make this work. Once this is done, you will get all of those lights on the dash.

 

[Letsgomoreplaces]

Even with a supercharger and 2wd I can't burn out

 

[OregonLC]

I also wouldn't put that engine in my LC and drive it 100 miles from civilization. Powerful, efficient, but not reliable enough to leave my life in its hands.

What? You mean Overland Journal's R8 isn't the ultimate off highway vehicle? LOL.

 

[04UZJ100]

I believe there is at least some correlation between reliability and power. That's just one of the commandments of automotive design. Toyota could have got close to 300hp easily to the crank from a 4.7l engine if they sacrificed a few aspects of the design. I don't think it's a bad design, in fact its an awesome engine. Toyota designed not only the engine, but the entire vehicle to be insanely reliable. It's not efficient and its not fast, but with it's torque and gearing it's still pretty beastly, while maintaining it's bullet-proof status.

The platform shouldn't matter terribly much on a dyno, especially a 2-wheel dyno. Most people tend to consider wheel hp the only real measurement of power. Maybe one day the manufacturers will get on board and start advertising power as a measurement from the wheels as well.

Why? The 4Runner is at 268.

 

[RL4x4]

My 3.5L N54 puts 400 to the wheels (with tune/methanol)

<OT> Ummm, maybe a 3.0L N54

 

[mechanixhorseman]

Why? The 4Runner is at 268.

That's still pretty moderate given the engine size.

<OT> Ummm, maybe a 3.0L N54

Ya, my bust. My last car was a 3.5 so I still get the numbers mixed up. It only reinforces my point further though