Exhaust Theories and Question

[Jake]

Based on my knowledge of engine theories, i know going with a bigger exhaust will have a tendency to move the power curve up higher. Ideally one would want to have an exhaust large enough to handle all of the given exhaust volume with no back pressure, yet small enough to keep the velocity at its max speed throughout the system. Obviously in the real world its impossible to have a perfect system. If its too big, velocity will drop decreasing the scavenging effect and possibly in a sense creating backpressure due to lack of flow. On the other hand, go to small, i don't think i even need to explain that one.

So my question is, would going with a 5 inch exhaust hurt power at all in the lower RPM range as opposed to a stock 3.5 or 4" exhaust? With the extra volume capacity, i would think velocity will most likely take a hit to the point of possibly hurting power in the lower end.

I know thats alot for such a simple question, but i figure id attract more knowledgeable people to answer my question, and be on the same page intellectually, and possibly weed out the people that will just give an answer of "i don't know, it shouldn't" or something along those lines.

[MountainMan]

Subscribed.

[YodersStrokin96]

i dont know, it should ha ha i jk jake you be over tomorrow???

[Dave]

Short answer. Yes you will lose low end power by going with a 5 inch exhaust on a stock injectored and turboed truck

[Dave]

Actually you may even lose a little low end by going to a 4 inch exhaust. But not enough to be overly noticable

[Jake]

Originally Posted by YodersStrokin96

i dont know, it should ha ha i jk jake you be over tomorrow???

Idk. I'll call you in a bit when nick leaves.

Originally Posted by Dave

Short answer. Yes you will lose low end power by going with a 5 inch exhaust on a stock injectored and turboed truck

But how much? 5 horse?

[Dave]

Originally Posted by Jake

Idk. I'll call you in a bit when nick leaves.



But how much? 5 horse?

I cant give you a number but it will be noticable

[Jake]

Noticeable is bad...

[smx949]

Just put 5" on my truck last weekend, it is noticeable, and i also have a banks 1.0 exhaust housing...stock tune........

[Goose350]

FWIW, I saw a loss of low end when I put my 4" exhaust on. Its not even a 4" dp either. Now that I have my tuner it does not matter though