Originally Posted by DrJay
As you may have noticed lately I've been putting a few myths to rest, most notibly the whole 'backpressure' issue.
I'm not so sure we put the issue of the 'backpressure myth' to bed. The majour reason for this is that in some cases backpressure will help you...but not at the race track.
In your link, it'* not really a usefull deabte if someone takes the standpoint of debunking extremes;
I've never actually heard anyone say more backpressure is better and certainly when we speak of L67 engines, and L36s, the PCM is capable of adjusting fuel mixtures and of being programmed with Power Enrichment tables that won't cause you to burn exhaust valves.
If one takes the view of trying to understand the effect of backpressure on an engine'* performance, then certainly there is something to be learned. If on the other hand one were simply trying to exagerate extremes then it'* a moot point.
Some back pressure will help your part throttle response...but it won't help you at the track.
Since we ask so much of our engines over a wide range of conditions all aspects of it'* configuration are compromises. We could have variable valve and camshaft timing as well as variable exhaust length and volume if we hope to optimise all conditions, short of that we must make compromises.