Originally Posted by TTdude

Check out Venkatreddy and twturbo. The injector size will determine if you can run both gas and E85.

Originally Posted by vrybad

My thoughts on this and the original chart posted here.

I don't think there is any issue with the dyno on either setup, just that it appears your setup has been pushed a bit harder (more aggressive boost/timing) nearer to redline, or your turbos are simply more efficient (they are K24's).
Just a guess, though, since I don't know your tune particulars, but your chart looks more typical, with hp kind of climbing as rpms increase.

When I look at the original chart, I see torque peak at about 4600rpm, and peak hp occurring at about 5000rpm, when in a fully tuned setup, peak hp typically occurs nearer to redline.

This leads me to believe there is a bit more left in this setup at the big end, unless the turbos are running out of breath.

Torque spike has nothing to do with a flat HP curve.
That spike can be tuned in or out.

Personally, I always tune to increase torque as redline approaches, but that may not have been possible in this setup (or he is keeping the good stuff for later!)

I'm also guessing he tuned the car to limit torque around 4600 and keep that engine together.

If torque drops hard as rpm's increase, then the hp curve will tend to "flatten" out.
The car goes from 630 torque at 4600 to about 450 torque at 6500rpm, losing nearly 200 lbs in a 2000rpm span.

In a dyno run, the most "force" is being applied at the torque peak.
As rpms increase, "force" drops (not "speed" or "rpm") and the resultant hp curve drops as well.
That's why, if a car can be tuned to increase torque (force) as rpm increases, the result will be a climbing hp curve.

The car should still be a performer, but has a lot left on the table with a better turbocharger.

Originally Posted by vr4henry

Thanks for the tip -- I'll try to dig up what I can on those cars. At least KPGs is a 996, but it's heavily modded so who knows what EVOMS has in there for a tune

Originally Posted by KPG

I can switch between pump and ethanol with a switch in my centerconsole, although it is not a true flex fuel system like modern vehicles that can compensate for varying ratios of fuel. As far as the tune, it is no different than gas in that it is fuel,air,and spark.It does have an afr well under 10.0 for the ethanol but the fuel has so me very nice cooling properties. I was driving mine and Topguns 1600cc car in 110 deg AZ heat and the cars were boosting fully with no timing being pulled. My tunes on gas always felt "tired" in that type of heat ethanol is very consistent. I will never have another perf car that doesn't run on ethanol regardless of the ultimate power level.... good luck with the ethanol, you won't regret it