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West Point
The Library
7.3 Performance
Compound turbo problems
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[QUOTE="Powerstroke Cowboy, post: 1558361, member: 610"] With your boost numbers, it shows the 369 is not spooling. The gt55 is doing all the boost but a few pounds of it. Something is keeping the s369 from spooling. Even with a 1.10 housing the s369 should spool way before 2500. Basically the gt55 is what's spooling at 2500rpm. That's why all the lag. The s369 is not spooling. Get that took.care of and you should have a fast spooling rig. I still would like to know the exhaust pressure between the two turbos. [/QUOTE]
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