N.O.6speed

Do we have any members (not vendors) who have dynoed before and after the whole gamut of exhaust mods? ie: pre cats, jpipe, high flow cat or cat delete, etc. I have seen numerous exhaust threads on here and have witnessed many arguments on both sides about power claims from these mods. The only dyno figures i have seen were by the vendors selling the parts.
Anyone?

N.O.6speed

nobody? How about with just the precat deletes?

D's Up

bump

greco9885

iTrader: (1)

i have on but its not entirely accurate...

at the time:
aem v2
rv6 pre-cat deletes
rv6 j pipe
rv6 3rd cat delete
greddy evo 2

now:
changed rv6 j pipe to atlp v1 which definitely added some power

my car was dumping crazy fuel too since the ecu wasnt fully reset, the car had around 25 miles on it after the mods, it takes roughly 50 miles to fully reset and relearn, eventually ill re dyno and get better numbers. also baseline run was done with no humidity, modded was done when it was raining and 100% humidity

oh and the dyno i went to is a heart breaker, very accurate

InFaMouSLink

iTrader: (10)

greco, what dyno place you went to?? i want to dyno ASAP.

N.O.6speed

cool. thanks for the reply. So it looks like you peak gained 25 whp & 18 wtq with a full exhaust. Based on the numerous threads ive read by others on exhaust mods, I was hoping a full exhaust would yield more power. Some were saying precats alone would be 15-20whp and j pipe another 7-10whp. I know it doesnt work like that, meaning, adding power for individual mods number for number.

Do you think you gained more power as the ecu "learned"?

N.O.6speed

I guess the truest test obviously would be to dyno, then install and redyno the same day. Easier said than done, im sure.

bigmoetl1

you are looking at the max numbers which is good but also you have to look at the overall number this car is performing much better throughout the entire rpm band

N.O.6speed

you are correct! I guess, it just seems low for full bolt ons (intake, pre cats, jpipe, exhaust).

But, like the guy said different day with different weather conditions. Im sure humidity would make an impact on whp #s. Plus he eluded to his ecu not having relearned.

Just curious if the ecu thing would be a measurable power difference....

bigmoetl1

it may provide a few more horsepower. i am tempted to see how much more power the atlp v1 jpipe made with those modes compared to richies

greco9885

iTrader: (1)

nrg tech racing in west babylon, li

without a doubt, it was dumping fuel like crazy, i think a/f was 15ish under WOT

almost impossible, took about 10 hours for everything, would of took about 8 but ran into some problems trying to take the pre cats out. we started around 2-3pm then finished the next day, then day after took it to dyno, but my car stayed at the shop, hence the no miles on it

it really made a big difference, not so much in HP, but definitely in torque.

think about it, the more fuel its dumping, the less amount of air, so its not as big of a combustion. lean is mean. rich is dick....lmao

N.O.6speed

thanks for the replies Greco.