Little Coyote E85 vs pump gas comparison today

[KrisR]

Not big dyno numbers but this is what the car picked up by switching to E85. Peak power is only up by 9hp but the midrange torque is up 20+ at some places and the curve looks much better. It should pull a lot harder after shifts now in the 5000-5500 range. Also the old pull was with JBA mufflers and the new one is with stock ones, might have lost a couple hp with the stock mufflers too, not much I'm guessing though. The pump gas pull was stopped at ~6800rpm by the speed limiter but power had already peaked anyway.

This is a 2011 GT, automatic, Circle D 5C converter (locked in 4th for these pulls), Boss manifold, Airaid CAI, Pypes offroad X, LU47 injectors.

Obviously we didn't hook the wideband up for today's pulls because I was datalogging with my handheld anyway.

Now this is not meant to be a direct a/b comparison because it was on a different day (same dyno and SAE corrected though), but I still think the data is useful. Same tuner (Mike Rousch of Mid Atlantic Performance).

Will see what it picks up at the track soon.

Thanks to Hitech Motorsport for the dyno time.

 

[BruceH]

Are there any other mod plans? Most Dynojets read the same, they are very consistent with the correction factor. That's been my experience anyway.

That's a nice pickup in torque for just switching fuel. With my 4.6 I saw around a 10/10 gain. With a supercharger the gains are significant. Do you plan to run e85 at the track for it's anti detonation properties or is this just an experiment?

 

[Mike K]

Nice mid range gains. Let me know when you plan on going to the track cause I want to go also.

 

[KrisR]

Are there any other mod plans? Most Dynojets read the same, they are very consistent with the correction factor. That's been my experience anyway.

That's a nice pickup in torque for just switching fuel. With my 4.6 I saw around a 10/10 gain. With a supercharger the gains are significant. Do you plan to run e85 at the track for it's anti detonation properties or is this just an experiment?

I am planning to run E85 pretty much most of the time. I ran it 100% of the time on my old 99 2v turbo GT. I am seeing around 20mpg on the highway with E85 and the fuel is ~$1.00 cheaper than premium in my area so it doesn't cost any more to run overall, might even be slightly less. Obviously I will see the most benefit at the track. Also I like how it smells a lot better than pump gas with no cats. I'm sure the car will benefit more when it's hot outside also.

But of course I have a pump gas tune also in case I go on a road trip and E85 isn't available or whatever.

I currently don't have any other mod plans (other than maybe going from 3.15 to 3.31 gears). I ran 11.50s-60s at 118-119 last season with pump gas in it and this season the raceweight of the car is ~70lbs lighter so we will see how it does.

 

[KrisR]

Nice mid range gains. Let me know when you plan on going to the track cause I want to go also.

I am planning on going to Rock Falls this Saturday weather permitting, otherwise next Saturday.

 

[Mike K]

I won't be able to make it this Saturday and if I don't go to Chicago next weekend I'm game.

 

[kdanner]

Looks like the gas pull laid down some from 4k to 5.5k or so, likely from shifting a bit richer according to the shape of the AF trace, really the whole gas pull is rich if that wideband is correct, so the delta would be less with that corrected. What happened with pulls #2 through #12?

 

[KrisR]

Looks like the gas pull laid down some from 4k to 5.5k or so, likely from shifting a bit richer according to the shape of the AF trace, really the whole gas pull is rich if that wideband is correct, so the delta would be less with that corrected. What happened with pulls #2 through #12?

The commanded lambda was the same for both pulls (.82). I don't put much stock in the tailpipe sniffers at dyno shops anymore, especially when we can datalog real-time with our handhelds and use oxygen sensors that are right in the manifolds, which is why we didn't even bother using one yesterday. I datalogged the pull and sent it to Mike Rousch for evaluation.

If anything, the E85 run should have weaker in the 4-4.5k range, as the tune is basically set up for E85 and we have E70-E75 in our pumps right now, and the initial part of the pull had the air/fuel dipping into the .79-.80 range before the fuel trims could correct (I had just loaded this particular tune file which was a designated 4th gear locked converter 'dyno' file). I typically see the LTFTs pulling out 6-8% fuel after the tune has been in the car for more than a couple WOT pulls.

Pulls 2-12 were most likely when we were experimenting with 3rd gear pulls, which we also did back when I had pump gas in the car, and also a couple pulls that were aborted accidentally by the dyno operator.

The E85 run was done using the first E85 file (not datalogged and subsequently revised if necessary) sent to me by Mike. I sent him the datalog from the pull; not sure if he is going to make any alterations.

Again, this was not meant as a scientific study; I just wanted to see if I could see any differences for myself, using the same dyno, etc.

 

[fiveoh]

What did it make in 3rd gear? Curious because I dynod mind in 3rd(no 4th gear lock tune) and wanted to see the difference.

 

[KrisR]

What did it make in 3rd gear? Curious because I dynod mind in 3rd(no 4th gear lock tune) and wanted to see the difference.

I didn't take the run too seriously because the curve was so funky because of my 5C converter locking up in the middle of the run, but it was right around 400 SAE peaking at 7500 rpm.

 

[fiveoh]

I didn't take the run too seriously because the curve was so funky because of my 5C converter locking up in the middle of the run, but it was right around 400 SAE peaking at 7500 rpm.

It made more in 3rd gear? Weird I thought it would make less...or maybe because it was run to a higher rpm..

 

[KrisR]

It made more in 3rd gear? Weird I thought it would make less...or maybe because it was run to a higher rpm..

My car has always made more peak power and less peak torque in 3rd versus 4th. My friend's automatic Coyote was the same on the dyno.

Mine has a totally different curve in 3rd also. It peaks at ~6400-6600 (as you can see) in 4th but doesn't peak until 7600 or so in 3rd.