With internal wastegates could one use non-equal length turbo manifolds (b/c the wastegate is on the turbo instead of the manifold)?
Yes you can use Non-Equal Length and, no…it’s not the best suggestion !”Equal-Length” gives you less chance of “Boost Creep” than say non-equal length…With ports matched and using the EXTERNAL wastegate which is usually designed to be centered and and NOT on runner 1. This is just a more efficent design and creates much better flow to the turbine. These are also lighter being Stainless Steel as opposed to Iron and “Hi-Ductile” Iron designs. Here is the TOP turbo manifold out today with a nice video that compares the gains by using a equal length over a log style manifold. Full-Race Equal Length vs. Log manifold Testing http://fugu.trnetworks.net/~geoff/movies/FR%20Manifold%20Test.mpeg] It also has to do with what kind of wastegate you use…The Delgates that come standard with most kits, tends to fail and cause boost creep…Although their Race-gate is an excellent design. I would always recomend the Tial line of wastegate products. However…having an INTERNAL wastegate…of cours
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