I just rebuilt my 00 mitsubishi eclipse v6 (6g72) engine. All performance parts, Pauter H-rods, Wiseco Pistons, SI valves, the whole bit. Crank and cams are original, just had them polished and blanced. The pistons were only bored .5mm...
Here is the problem; the car runs, idles a little ruff, back firing sometimes when its cold. It accelerates pretty strong until about 4 grand, then the exhaust changes pitch (gets lower) and I loose all acceleration power.
The car has a set of high flow Megan Racing headers, to a high flow cat (all O2 sensors are in the right place), to a stainless 3" catback to straight through magnaflow muffers (dual).
I am not sure why it is loosing power at this RPM, snds like its getting choked or somthing? I know its getting plenty of air from the AEM V2 intake, and i dont think its fuel...?
Is this tuning? Do I need to get some tuning software, or a Greddy e-manage system...
maybe somethings not set right or pluged in correctly i have a similer mitsubishi version of the 6g72
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