Here's my dyno sheet. First off, I just want to say I trust my tunner 100%!

This was my final tune.

I was more than satisfied with the outcome, but after I posted up my dyno graph, some of my S2000 buddies said that they think its a little too lean at the higher RPM's.

Just trying to get some assurance that the tune is safe.


Setup.

Pfab elt top mount
Precision 6165BB turbo
Tail 44mm wastegate (9psi spring)
tail 50mm bov
InlinePro 3" exhaust
sos vmount intercooler.
ID1000
Dual aem 320lph e85 pumps.

Tuned on E85

 

I would guess you are running out of injector. Some don't mind running e85 quite a bit leaner than gasoline, but thats a little too lean for my comfort. I would turn it down 1-2psi for now until you can make sure. Also what AFR's do you see on the street? Any chance you have datalogged a pull or 2?

 

13.6 is pretty lean. Your power also drops off at that point. Turn it down.
It's a pretty rough graph at that point even with smoothing
Don't know why he would try running it like that

 

Alright, just got done talking with my tuner. He said this was the last dyno run, but after this run he did drop boost pressure and added fuel but only after 7800rpm. So technically im still making the same amount of peak whp and wtq.


I feel better now. Except that I dont have a dyno sheet of my final tune. But I'm not mad, because he did a great job, the price for the tune was way below what I was expecting to pay. Thanks for the help guys!! Car feels like a beast!

 

Do you have a wideband? You can verify AFR during a pull if your worried about it.

 

No I dont have one.

 

Your making that kind of power and no one suggested you get a wideband?
The tune was cheap but also not that great. Why limit your power to 7800 rpms if you don't have too?

 

I feel like a wideband is a necessity with a boosted car. They aren't that expensive, I would strongly recommend getting one.

 

Do you guys think the power should keep climbing all the way to 9000rpm?

I think the problem here is that my injectors cant supply enough fuel anyways. I dont know what my base fuel pressure is at, but I think the injectors are close to their limits already.

 

It depends on your fueling and turbo. Normally you want power to keep clinic till redline. What injector size are you running