Backpressure

[maltloaf]

Hi all,

If you add a free flowing performance exhaust system to a car and reduce the back pressure could this potentially reduce the performance of the engine? I guess what I am really asking is what effect does backpressure have on performance?

Thanks for any info.

Matt B.

[stevieturbo]

This has been covered before. Any loss of performance is usually due to problems elsewhere.
Incorrect mapping being the most likely, as it isnt optimised to suit the modification.

Others will say you need backpressure depending on cam choice. IMO that means you have the wrong cam, not that you need backpresure.

[maltloaf]

sorry, my mistake found it www.pistonheads.com/gassing/topic.asp?p=1&f=66&t=124140&h=0

[deltafox]

maltloaf said:

I guess what I am really asking is what effect does backpressure have on performance? Thanks for any info. Matt B.

Put your hand over your mouth then go for a 5 mile run.

Let us know how you feel when you get back.

Im putting my money on breathless verging on asphyxia...

Thats what backpressure does to your engine; Restricts its breathing abilities, therefore it is bad.

[gary_tholl]

stevieturbo said:

This has been covered before. Any loss of performance is usually due to problems elsewhere. Incorrect mapping being the most likely, as it isnt optimised to suit the modification. Others will say you need backpressure depending on cam choice. IMO that means you have the wrong cam, not that you need backpresure.

I don't want to get into this one again, but that isn't quite what was said. The arguement was that backpressure can be used to tune the performance characteristics of an engine to suit a particular use.

Gary