EXhaust Pipping Inquire

[Spidey]

Hey I had a guy tell me that if I went 3" pipping from down pipe to exhaust. It would kill off my low end power???I was wondering if he was right ??? Why he might think that think that???By the way my set up for now: Red top Sr20det, Holley fuel pump, HKS type S FMIC, and Blitz SS BOV.Thanks for your help.

[Bryce]

no worries with a turbowith a na motor to large of a an exhaust hurts scavenging effect and can cause reversion at low rpms(exhaust velocities). But with a turbo it's not a concern.bryce

[Spidey]

This guy that told me has a SOHC Turbo CRX, why would he tell me I would be loosing or gaining backpressure?? cant remember if he said loosing or gaining??

[lucas_420]

well a larger pipe will decrease backpressure but that is a good thing in a car with a turbo. It allows quicker spooling. What that guy might be saying (assuming he isn't a complete fool) is that you might run the risk of burning the valves with little/no backpressure. This might be true in cars not intended for use with a turbo (ie: a SOHC CRX) but cars that have a turbo should have a cam profile to match their use. I read this somewhere so someone correct me if I get it wrong, but cars that have a turbo will often have an exhaust profile that opens later than it would on a N/A car so it can build up more pressure before release, putting more power to move the turbo.

now for my shot in the dark:

I assume this extra time closed allows a more complete burn of the gasses keeping the valves from getting scorched due to lack of backpressure to keep the "explosion" contained.:help Am I even close...anyone?

With a turbo, less backpressure is preferred. But it always helps to have the right cam.

[Spidey]

Kool thanx 4 ur help thats more info than I needed actually but non the less is greatly appreciated