![]() ![]() Lastly, the biggest mistake you can make to spool up speed is put a split pulse housing on an open collector, you will probably pick up about 800rpm or more here, without changing the manifold, maybe more, depending on how miss-matched it is now. Length is not critical, but reasonably short runners are preffered, don't try to make them longer than they need to be. If you have an external gate, it has to be split pulse all the way to the face of the valve in the wastegate, this is the most difficult part, and also one of the most important. Next, the manifold has to be split pulse all the way to the turbo, and should be paired so that each side is hit with exhaust gas 1 after the other, like one pulse to the front side, the next to the back, and so on. 5-1mm bigger, than fine, but any bigger, and go the next size down. Smaller turbos in a twin turbo kit can also make very similar power as a larger single turbo. ![]() Each turbo only needs the exhaust from 4 cylinders to spool it, so they are able to spool much faster than a single kit. Without pulling the manifold off and measuring myself, I can't give you a diameter, but measure the size of the exhaust port, and make the manifold from steam pipe, in a size the same diameter as the port, or smaller, DO NOT MAKE IT BIGGER!!! If it is like. Twin turbos are awesome for the daily driven or mostly street-driven Mustang. ![]()
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