![]() ![]() Use this calculator, like all the calculators on, as a guide only. To illustrate how big is not always better.Īnd going into the weeds even further, here is an article going into exhaust manifold design Header Primary DiametersĪ bit off topic but a very good article here comparing large bore primaries vs small bore primaries on a 4G63 motor. The exhaust system itself can be a smaller diameter because the gases become more homogeneous as they go down the exhaust. The larger downpipe improves spool and power. Stav Tech has an interesting post here, the sum up being the larger the downpipe the better, because the gas exiting the turbo is so turbulent. When you choose horsepower, this calculator will measure the approximate horsepower of an engine based on the torque of the engine (measured in foot-pounds). They observed power comes in sooner but peak power is around the same, although on the 3 inch downpipe boost was 1 PSI less. Koracing have compared 2.5 inch downpipes to 3 inch downpipes. In contrast to the exhaust system the rule seems to be for turbo downpipes, the bigger the better. If the exhaust speed is high, use the larger diameter.Īs a rule, Corky Bell states exhaust gas velocity should not exceed 250 ft/sec It also pays to look at the exhaust flow speed as well as the diameter. For this reason we have added results which are 20% larger than those recommended in the book. To put it another way, the benefits of large diameter pipes may have been underestimated. These factors may have made assessing the benefit of large diameter exhausts harder (when the book was written) because large bore exhaust pipes eg 3, 4 and 5 inch were rare so dyno results for cars running these diameters was also rare. The book was published in 1997 when large exhaust pipe diameters were harder to find, due to their price and being harder to work with due to the high price of large diameter pipe benders at the time.īuy the book Maximum Boost on ebay – Click Here ![]() Simply enter your goal crank horsepower goal, the number of injectors (cylinders) your engine has, the correct number based on aspiration of your engine, and goal PSI at the rail.This exhaust pipe size calculator uses information from Corky Bell’s book, Maximum Boost as a reference. We've built this handy Fuel Injector sizing calculator to help you determine how much flow you'll need. ![]()
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