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mark houghton mark houghton is offline
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Join Date: Jul 2008
Location: Central Washington State
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Originally Posted by fredmeister View Post
In a nutshell:
With the DOD installed as you describe you have to install a spring less than the minimum boost you are ever gonna run. So if you want to target 0.8 bar use the 0.6bar spring and make up the remaining 0.2bar with the DOD.
Running a 0.9bar spring will never allow you to go less than 0.9bar....its just the way the wastegate works with your DOD installed correctly.


As to his questions re: higher boost, the answer is flowing headers and mufflers don't in and of themselves result in boost beyond the spring setting of the WG....but may result in boost spikes on occasion, depending on a lot of things. I would start with a .6 spring if the intention is to use the DOD, set it for .8bar boost, and if it spikes or creeps beyond that then simply dial it down.
Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 06-03-2013, 02:01 PM
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