240Z Turbo Posted March 8, 2002 Share Posted March 8, 2002 Well, after letting my buddy Shaun drive the car I noticed the car having boost creep. After about 6200rpm in 2nd and 3rd gear it spikes 20+psi. I used some grip tight pliers and held the wastegate valve completely open and still it spikes. The stock wastegate holes in the turbine housing are 20mm so the total surface area of the two is 2*Pi*r^2=2*3.14159*10mm*10mm=628.318mm^2 Whereas the 42mm Racegate is Pi*r^2=3.14159*21*21=1385.44mm^2 Crap, less than 1/2 the surface are! DOH! Don't you just love being the one to work out all the problems? I will stick them in a mill and open them up. I have not decided if I will go to dual wastegates or just keep the single racegate. I want to be up a running again soon! Quote Link to comment Share on other sites More sharing options...
awd92gsx Posted March 8, 2002 Share Posted March 8, 2002 You're running twin 16's right? You could probably port the wastegate holes and install some 34mm flappers and your problem would go away... Quote Link to comment Share on other sites More sharing options...
240Z Turbo Posted March 8, 2002 Author Share Posted March 8, 2002 Well, I removed the flappers because I am running an external wastegate. I will definitely port the holes. Most shop port them from 20mm to 28mm or 314mm^2 to 615mm^2 which is about 98% more area. I will probably take them out to 38mm. Quote Link to comment Share on other sites More sharing options...
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