questions for those who gutted there cat.(and no, not the 4 legged kind!!)
09-07-2005, 05:11 PM
#31
Campeck Rulez
Rennlist Member
Rennlist Member
i dont need to. ask the many racers on the forum running straight exhausts if they have ever burned a valve.
i dont see what you mean helps the valve not float?
the valve opens inward. so if there was backpressure in the exhuast what would happen is it would try to stop the valve from closing. inducing valve float....
and the goal on a turbo is to get higher boost pressure then exhaust back pressure. on a turbo there is no way around the backpressure. but on an na there is. and its certainly not needed and any lack will not reduce hp.
choppy is what causes the resonance. and power. they just have tuned (or by coincidence) the engine to get the intake and exhaust pulses in line with eacth other right after 3k rpm. cause thats when the exhaust sounds like crap. a bunch of spaced out pops. yet thats when the NA gets its kick.
eh. someone needs to take a pressure guage to the exhaust. then make an exhaust that keeps resonance and reduces backflow and compare. until then ppl will not agree.
i dont see what you mean helps the valve not float?
the valve opens inward. so if there was backpressure in the exhuast what would happen is it would try to stop the valve from closing. inducing valve float....
and the goal on a turbo is to get higher boost pressure then exhaust back pressure. on a turbo there is no way around the backpressure. but on an na there is. and its certainly not needed and any lack will not reduce hp.
choppy is what causes the resonance. and power. they just have tuned (or by coincidence) the engine to get the intake and exhaust pulses in line with eacth other right after 3k rpm. cause thats when the exhaust sounds like crap. a bunch of spaced out pops. yet thats when the NA gets its kick.
eh. someone needs to take a pressure guage to the exhaust. then make an exhaust that keeps resonance and reduces backflow and compare. until then ppl will not agree.
