Installed long tubes + hi flow cats - lost tq...do I need a chip reburn?
Thread Starter
|
Member
Joined: Jun 2002
Posts: 54
Likes: 0
From: Plano, TX
Installed long tubes + hi flow cats - lost tq...do I need a chip reburn?
Same shop, same dyno.
Previous baseline : 383hp / 479tq
Which included...
Bassani
4 lb pulley
chip
cold air intake
breather cap
----------------------
Installed long tubes + hi flow cats = 388hp / 473tq
Picked up 5hp peak, lost 6tq peak
Only other difference is weather (warmer now by about 30 degrees).
Is this pretty much to be expected or do I need to reburn the chip now that I've added long tubs and hi flow cats?
In any event, I didn't really expect gains but wanted that sound and man did I ever get it! Sounds GREAT now...pissed off and mean. Best sounding combo I've ever heard if I do say so myself.
Previous baseline : 383hp / 479tq
Which included...
Bassani
4 lb pulley
chip
cold air intake
breather cap
----------------------
Installed long tubes + hi flow cats = 388hp / 473tq
Picked up 5hp peak, lost 6tq peak
Only other difference is weather (warmer now by about 30 degrees).
Is this pretty much to be expected or do I need to reburn the chip now that I've added long tubs and hi flow cats?
In any event, I didn't really expect gains but wanted that sound and man did I ever get it! Sounds GREAT now...pissed off and mean. Best sounding combo I've ever heard if I do say so myself.
Senior Member
Joined: Oct 2002
Posts: 1,620
Likes: 1
From: Central Joisey
Were those numbers uncorrected or corrected? You should be comparing corrected (STD or SAE) numbers instead of "actual" numbers. Look at this thread for my results. I had gained a little more HP and over 20 ft# of tqu. You shouldn't need a reburn to compensate for headers.
Thread Starter
|
Member
Joined: Jun 2002
Posts: 54
Likes: 0
From: Plano, TX
Yup, those are corrected numbers. The guy running the dyno says that everyone complains that his dyno reads low so I'm unsure of how they would compare on another dyno...
Cool - glad to hear that there is no need for a reburn after headers and cats.
Man this truck sounds good! A bit of rasp around 2.5K under light throttle but not too bad.
Biggest change is the lack of backpressure now - left off the gas and you just coast! Changes your braking points a tad and you lose some of the burble but it just means that ya gotta creep up in the revs a bit more.
Cool - glad to hear that there is no need for a reburn after headers and cats.
Man this truck sounds good! A bit of rasp around 2.5K under light throttle but not too bad.
Biggest change is the lack of backpressure now - left off the gas and you just coast! Changes your braking points a tad and you lose some of the burble but it just means that ya gotta creep up in the revs a bit more.