Downpipe, Headers & Exhaust System Question

[bigboy25]

Would a 3" downpipe,Headers, High Flow or "Modded" Cat attached to a 3" exhaust system ( Hooker, Magnaflow or whoever) reduce backpressure enough to cause me to lose low end torque? I have been warned about such condition in my other vehicle. If you have any experience or if you are running a 3" Cat Back exhaust.....let me know your feelings. Thanks

 

[Jerryl]

Would a 3" downpipe,Headers, High Flow or "Modded" Cat attached to a 3" exhaust system ( Hooker, Magnaflow or whoever) reduce backpressure enough to cause me to lose low end torque? I have been warned about such condition in my other vehicle. If you have any experience or if you are running a 3" Cat Back exhaust.....let me know your feelings. Thanks

Ok, let me try this one ........:wink:
We really need more info as in:
“Loose low end torque” - Is this before or after boost, and what RPM range?

On a turbo car, you want to reduce backpressure after the turbo (and before the turbo as well, depending on the goal)
The greater the pressure differential “before and after the turbo", the faster the spool-up (Less turbo lag)
So, the turbo must be the biggest restriction in the system, if you want it to "boost".
Anything you do to reduce back pressure “after the turbo”, should not “soften the bottom end”, all else being the same. (Yes, you can go too big on the DP and hurt the performance)

The only thing I would be careful with, are the headers.
Too big, and it can slow the spool down, making it “soft”.

As far as specicif on the 3", I doubt it will hold you back, but, need info on your set-up.

 

[dr_frankenstein]

If your other vehicle is not boosted then this applys. but should be good stuff for a turbo buick.

Everything else Jerry hit on the head.

A.j.

 

[bigboy25]

Thanks

Ok, let me try this one ........:wink:
We really need more info as in:
“Loose low end torque” - Is this before or after boost, and what RPM range?

On a turbo car, you want to reduce backpressure after the turbo (and before the turbo as well, depending on the goal)
The greater the pressure differential “before and after the turbo", the faster the spool-up (Less turbo lag)
So, the turbo must be the biggest restriction in the system, if you want it to "boost".
Anything you do to reduce back pressure “after the turbo”, should not “soften the bottom end”, all else being the same. (Yes, you can go too big on the DP and hurt the performance)

The only thing I would be careful with, are the headers.
Too big, and it can slow the spool down, making it “soft”.

As far as specicif on the 3", I doubt it will hold you back, but, need info on your set-up.

You answered it perfectly.......thank you. It's the stuff that turbo6x2 is selling me ( the lee thompson 3" downpipe, headers, up pipe, crossover ) that with a ta 33c is all I have going on so far. Have an 87 ECM bought, just have not installed yet.

 

[Boost231]

cant go wrong with what jamie has for sale

 

[TType84]

+1

the lee thompson setup is basically legendary