Back-pressure question
#4
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the 70mm singles seem to be all the rage amongst owners. People usually dyno around 20hp over stock with the 70mm and top end header. With tuning, you should see mid 220s or so. Stock, the car makes just below 200 on average.
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Originally Posted by sabry,Jul 12 2006, 02:24 AM
I still don't really get it because I've tried higher flowing piping on my car, eliminating the resinator, etc and It felt like I lost torque. I guess I'll just have to get to a Dyno and see what Im putting down, then play with it some more.
#7
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Originally Posted by afwfjustin,Jul 12 2006, 10:55 AM
the 70mm singles seem to be all the rage amongst owners. People usually dyno around 20hp over stock with the 70mm and top end header. With tuning, you should see mid 220s or so. Stock, the car makes just below 200 on average.
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Originally Posted by mxt_77,Jul 12 2006, 09:07 AM
Can you reference some dyno charts? I haven't seen anyone get 20hp from any IHE combo. (Except maybe some of the tuners that also just happen to sell the parts).
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Originally Posted by S2Kinside,Jul 11 2006, 10:33 PM
do you guys see actual power gains with the test pipe and or exhaust systems running NA? Or is it mainly for looks and sound?
I admit that my initial reason was for SOUND (i love '06 oval tip ), because I can't stand some 20K sport coupe or old V8 always rev beside me
#10
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Originally Posted by S2Kinside,Jul 12 2006, 12:12 PM
Id like to know why everyone I talk to tells me messing with the backpressure lowers output power and can throw a CEL because of the OBD2 system. Id like to see some dyno charts too if anyone has any.
Lowering backpressure won't necessarily cause a loss/gain of power, either. There are some very big equations that could probably tell you exactly how a change in backpressure will affect your power output, but I wouldn't have the information needed, or the mathematical expertise to build & solve them.
As a general rule of thumb, what I've heard (second-hand) for low-displacement, naturally-aspirated engines is that lowering the back-pressure causes a loss of torque at low-RPMs, and an increase in in torque/power at higher RPMs. YMMV.