loss of power???? installed new clutch and exhaust?

[zr-1assassin]

hi all, i just had the new clutch installed(acdelco) and put on some magnaflows and had the resonator removed. for some reason it feels like i lost some power, especialy in the lower rpm's. whats going on here??? do i need to adjust the fuel/air because of the exhaust change or do you think its something to do with the clutch? had them done about a week apart from one another and i noticed it after the clutch was done. has anyone heard of loosing power from a new clutch??? it just doesn't feel as strong as before.used to roast tires in 1st,2nd and little in third..... now barks in first and thats about it. anybody have any of this s%$$t happen to them?

[Peaven]

Originally Posted by zr-1assassin

hi all, i just had the new clutch installed(acdelco) and put on some magnaflows and had the resonator removed. for some reason it feels like i lost some power, especialy in the lower rpm's. whats going on here??? do i need to adjust the fuel/air because of the exhaust change or do you think its something to do with the clutch? had them done about a week apart from one another and i noticed it after the clutch was done. has anyone heard of loosing power from a new clutch??? it just doesn't feel as strong as before.used to roast tires in 1st,2nd and little in third..... now barks in first and thats about it. anybody have any of this s%$$t happen to them?

Sounds like your secondaries aren't opening up....have you pulled any codes yet? Anything else like the SES light coming on, etc?

[zr-1assassin]

hi peaven, no lights on at all. the secondaries are opening above the 3500 mark and i can feel a differance with the power key on/off. seems to be in the lower rpm's where i notice it most. it runs strong in the 3500-7000 range.

If you don't have everything lined up properly, it could be causing a binding issue.

[jonszr1]

another thought, did you go to 3 in / it could be an issue of the exhaust being too big . I ntried 3 in with just headers and lost low end tq. Iin fact i have made the most power with my new set up 3in to a ultra flow x pipe muffler and 2/12in out of that to flowmaster mufflers . if your car is basicly stk I would bet that the exhaust chg is causing . unless you are hearing noises from the clutch area . if it were binding you would proably feel a much heaver peddle . i know as I had that problem and it squelled like a stuck pig until the zf doc fixed it. jmho

[zr-1assassin]

ya, i was thinking it may have something to do with the back pressure too. it also now backfires a little, that won't hurt anything will it? it is the low-end torq. that has been effected so maybe it is the muffs. they are staight thru magnaflow mufflers with no back pressure. what should i do?

[jonszr1]

if ya think about it a little . If you are going to do a little drag racing the car will be easier to launch with this exhaust . the loss of tq is proably max 20 . It just depends on what you want to do with her . is it loud now? do you like it that way. Another mod to think about would be 410 gears . now that get your tq back right now. is your car stk except exhaust ? you might want to get ahold of the guy that tuned ,my car is is one of the best and could burn a new prom for you. here bis his e mail tell him that guy from lone pine sent ya .corey@hendersonperformance.com . he sure did a great job on my car. he also is a zr1 nut and has a very quick 368 91 zr1 as his personal ride. hope this helps .but talk to him before ya change anything he wont steer you wrong , promise

[tomtom72]

FWIW, the bigger exhaust diameter + different mufflers I'm sure has cost something on the low end. But I would be concerned about the fact that after the clutch was done and before the exhaust work (do I have that right?) you felt a difference.

I'm with Jeff. I would go over to zfdoc.com and look in the Q & A section about C-beam alignment. Heck, Bill is a stand up guy and always answers Q's if you e-mail him. I would do some checking up on the C-beam alignment just to be sure. JMHO.


Tom

[zr-1assassin]

hi guys, thanks for all the replies! the exhaust sound to me is worth a little loss (now has the rummmmble)but i always thought with releaving back pressure you would gain power? and whats with the back fireing? i dont know! and ballpark whats a set of 410 gears run for these beast? that would help the low-end problem! mine is all stock(unfortunatly) besides the exhaust. but i'v only had it for a few months so give me time and it wont be! i'm going to check into a prom, is there anyone around missouri for this or do they just set you up site-unseen? the clutch is good and tight and no noise comming from it so i do think(hope) its the exhaust....its not to bad, i can live with it for now i guess.

[tccrab]

Originally Posted by zr-1assassin

hi guys, thanks for all the replies! the exhaust sound to me is worth a little loss (now has the rummmmble)but i always thought with releaving back pressure you would gain power? and whats with the back fireing? i dont know! and ballpark whats a set of 410 gears run for these beast? that would help the low-end problem! mine is all stock(unfortunatly) besides the exhaust. but i'v only had it for a few months so give me time and it wont be! i'm going to check into a prom, is there anyone around missouri for this or do they just set you up site-unseen? the clutch is good and tight and no noise comming from it so i do think(hope) its the exhaust....its not to bad, i can live with it for now i guess.

Gears are ~$300, the best are the Viper gears. Setup and installation will run you another $600-700. Have them installed by a pro, it's not a home job unless you *really*really*really* know what you're doing.
Prom. Call Marc Haibeck, http://www.zr1specialist.com , his are the best.
He's actually not far from you.
He'll do your gears too.

TomC
'90ZR1 #792
Honorary Pirate