+2

i also noticed that he is using a fuel rail without a fpr...could the fuel be stagnant in the fuel rail itself?? fuel not atomizing?? had this problem years ago in a mustang. the fuel rail was toooo big and not enough pressure to utilize the fuel rail. went back to the stock fuel rail-pressure went up at the injector and made about a 40hp difference between tunes.

even though he is using a 255lph fuel pump, it still may not be enough for the fuel rail he is using. try the factory rail and put it back on the dyno or just street drive it. no money involved....on the street part.

check the MAF honeycomb. may be bent honeycombs causing an erratic reading not seen through timing or other tuning...??

 

you need cams for more power and tq

 

He did indeed bring the car over for us to check out.

First off. Andy did a fine job tuning the car. The Fuel and Timing maps where spot on for an Evo with a FPgreen. Very close to what we tune FPgreen equipped Evo's that produce 320-330whp on 91 octane on our dyno.

The tune is not at fault here whatsoever. The powercurvse where very smooth and consistant pull to pull. AFR was within 91 octane safe levels.

If I recall correctly, right off the street the car made 260whp. After messing with the tune a bit I had it up to 280whp safely and consistantly but, in my opinion, it is still 40-50whp shy of what other comparable Evos are making on our dyno.

After speaking with the owner, the boost leak test that was done was only to 15psi so I suggested he test to 20-25psi as some leaks do not show up until 20psi or so. One thing I noticed on the dyno is that, although the curves where smooth the car seemed to be a bit "tuggy" as it went through the RPM band. I've felt this before on other Evos that have boost leaks. The Boost was also not as consistant as I would normally like. Another finding was that the load curve was odd on this evo, lower load #'s at peak torque and higher load #'s up top. Which can also be a sign of a boost leak and/or flow issues.

I also suggested that I have seen oddities with aftermarket fuel rails at this level on evos. I suggested if all else failed that reverting back to the stock fuel rail might help.

The other thing I suggested is checking out the porting on the exhaust manifold and making sure it matches the porting on the hotside as any step there can hurt flow.

I hope having a second real-world account with the actual Evo in this thread will clear up alot of the confusion and misinformation that has been posted here.