4/22/2024 0 Comments Ls tuning ecu![]() ![]() My engine at 6100RPMs needs a 3.40" diameter single pipe exhaust, straight (using. ![]() Of course the pipes are not straight, but it doesn't have to be perfect just close. I need 115CFM per square inch of cross sectional straight pipe to match my 970CFM of exhaust gases. Extrapolating the data from my PE AFR correction tables and the data log AFR on the dyno chart I can conclude that at 6100 RPMs my engine is at 106% VE.Īt 6100 RPMs and 106% VE the engine is pulling in 664CFM of cool air, but pushing out about 970CFM of burned air and fuel. A straight pipe will flow ~ 115 CFM per square inch of cross-sectional flow area.Īt 6100 my VE table is maxed out in the tune (tuner pro RT won't let me go any higher than 99.61%) and my AFR is ~12.5:1. Once the exhaust pipe goes to a certain size it should stay there or get bigger only, never smaller. Even if it's set up to go from 3" to 3.5" to 3" again it's losing power. And to that you should never reduce exhaust size down stream as it introduces a restriction. The further away from the engine the smaller the pipes need to be due to cooling, but with my engine VE exceeding 100% and pushing 6600 rpm (going to be 7K in the future) the math shows the 2.75" diameter over axle pipe is too small. And it'll rise more with future mods too. But, that will go up as I open the exhaust. Optimally I should be at about 3.5" single at my dyno powered. Click to expand.I understand exhaust gas velocities, but at my power level a 2.75" pipe (and a single 3") is a pretty good restriction to power. ![]()
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