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West Point
The Library
7.3 Performance
Compound turbo problems
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[QUOTE="6.0 Tech, post: 1558367, member: 23001"] What housing do you have on the 55 and what size turbine wheel? We have found in our 6.4 testing that it seems the low pressure is the restriction. Charlie has a good write up on it in the 6.4 section. We also found on a 7.3 we were testing compounds on that we gained some power by stepping the low pressure up from a 75 to an 80 and bumping the housing size on the low pressure which coincides with what we have seen on the 6.4. And I do agree with the hi pressure may be a tad on the large size. I found on my truck that by adding a low pressure turbo, spool slowed about 200-300 rpm, and this is with a vgt as a high pressure. On the 6.4 we have found the high pressure is basically for off the line help and then the low pressure does the majority of the work. On a 60-65psi overall boost pull, we are seeing around 38-40 out of the low pressure. I’m aware apples to watermelons comparison, but I think the concept still applies. Sent from my iPhone using Tapatalk [/QUOTE]
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