Hey if i install a tuned PCM in the next few days with already having headers and CAI (No pulley yet), will i feel any difference in power or anything else? Thanks
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07-17-2010
Hey if i install a tuned PCM in the next few days with already having headers and CAI (No pulley yet), will i feel any difference in power or anything else? Thanks
07-17-2010
yes you will, and you'll notice firmer shifts
Originally Posted by Reptile
07-18-2010
And you'll run pig rich since it commanding more fuel to compensate for the higher boost rate.
07-18-2010
even with a canned 3800 Perf. tuned PCM??
07-18-2010
Because they are CANNED for a 3.4". With just a 3.8" it doesn't need all the fuel a 3.4" does...comprende?
07-18-2010
wouldn't the map sensor tell the pcm how much boost is coming in, and the pcm would send the right amount of fuel so it wouldn't run rich? I could be wrong
Originally Posted by Reptile
07-18-2010
i always thought it doesnt matter but thats a good point. id like to know because thats the reason i havnt gotton a tuned pcm yet.
07-19-2010
The only way you run richer is while in PE mode, normally I don't even touch the cruise and idle fuel tables.
07-19-2010
whats PE mode?
07-19-2010
PE = Power Enrichment. It's what the PCM locks into for the commanded AFR when you pass a certain throttle percentage.
What Blue is really trying to say here though, is if the fuel trims are way off, then your PE will be off. Being that this all goes off of your LTFT and STFT average, if the car is running rich to begin with, then your Power Enrichment will be rich, and the same goes to if it's lean.
Either way, out of both, you obviously want it to be rich, but it won't be as bad as most people think pulley wise.
07-19-2010
thats my current setup and it hasnt caused any problems
07-19-2010
come to erie and ill tune it instead of a canned tune
07-19-2010
thats quite a drive haha. so if i get a canned tune, i wont be dumping all this extra fuel into my engine since i dont have a smaller pulley?
07-21-2010
lol i meant for americanrice eater as he is only 75 minutes away...also the pcm will command fuel based on the maf reading and the settings for fuel ratio in the computer. u can have no pulley or a 2.6 pulley and the computer will still run off the maf to determine gas based on the calculation for desired afr. your injectors wont hold this of course but im saying this to make a point. now if the maf reading is wrong or tuned wrong of course the computers calculation will be wrong but thats it. ive gone from a 3.4 pulley to a 3.25 and now im at a 3.1 and ive yet to need to retune the pcm for afr or maf at any boost rate and i have consistently run within +/- 3 for my fuel trims and afr
07-21-2010
okay cool. looks like il have to re-look into this whole canned tune again lol
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