The most free flowing on that your sanity and your local regulations allow.What is a good muffler to run on 3" exhaust?
Daniel
I would start with a 3in downpipe and 3in exhaust any bigger you would loose low end torque there is a yellow bronco with a high performance 4bt in the build up threads take a look, it has a pipe that looks like a 3inI am wanting to run a 4 inch exhaust with a 6 inch stack with my future 4bt is that to big should it be smaller what does bigger exhaust do to performance and EGT's. Thanks in advance for the imput
Can you explain why a bigger exhaust will lose low end torque?I would start with a 3in downpipe and 3in exhaust any bigger you would loose low end torque
If you have an exhaust system that is too large for given specs of an engine it would have to rev higher to produce low end torque but would produce higher horsepower. One example when engines started coming out with 4 valves per cylinder the exhausts gasses was flowing out quicker than the 2 valve counterparts but the trade off was low end torque.Can you explain why a bigger exhaust will lose low end torque?
When you get an exhaust system bigger than neededCan you explain why a bigger exhaust will lose low end torque?
I want proof that a smaller exhaust makes more torque on a diesel truck... So big deal that Bronco only has 3", because he probably doesn't need 4" nobody does on the 4bt's, but 4" wouldn't hurt power at all... by 2/3 rule 3" is like 4" on a 6bt and 4" is like 6"... I personally chose 4" because when I had my motor running on a stand with 4" flex pipe to exit the exhaust gases, I had to have that sound(instead of sounding so much like a tractor it's closer to a semi)I would start with a 3in downpipe and 3in exhaust any bigger you would loose low end torque there is a yellow bronco with a high performance 4bt in the build up threads take a look, it has a pipe that looks like a 3in
Doesn't work that way and it has nothing to do with four valve vs two valve heads.If you have an exhaust system that is too large for given specs of an engine it would have to rev higher to produce low end torque but would produce higher horsepower. One example when engines started coming out with 4 valves per cylinder the exhausts gasses was flowing out quicker than the 2 valve counterparts but the trade off was low end torque.
So big exhaust or not am i going to gain or lose power? how big should my stack beDoesn't work that way and it has nothing to do with four valve vs two valve heads.
The bigger your exhaust, the less backpressure you get. Less backpressure means the turbo spools sooner and you get more low end torque.
Two valve heads used to (like back in the old days) get better low end torque because the extra turbulence caused better air/fuel mixing at lower engine speeds.
But now there's no advantage.
You will only gain power if your current system is restrictive.So big exhaust or not am i going to gain or lose power? how big should my stack be
There is no problem going bigger but some people get carried away going to big where is not practical 5in or more pipes are hard to bend in most shopsYou will only gain power if your current system is restrictive.