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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
I have not done it but most the good tuners and exhaust makers test for pressure deltas all the time.

One can test before the turbo to see if the turbine is creating to much back pressure. One can test after a turbo to determine of the muffler is restrictive. One can test before the compressor to see if the air filter or metering system is restrictive (vacuum). One can test at the compressor and at the manifold to see if the intercooler and plumbing is creating a significant pressure drop. One can test on both sides of the throttle body to see if it is a restriction.

Think about it, if we are pulling equal to 1 psi of vac on before the turbo, 1.5 psi through the intercooler plumbing, and .5 lbs because the throttle body is to small, we have to make the turbo work at a level of 18 lbs boost for the motor to see 15 lbs.

Having said that one would have to make a tap off the header. Probably add an extension of metal tubing or such to isolate the heat. Then a pressure gage if running it up on a dyno. Better yet an electronic pressure gage if you have and ability to data log.

I wish we would see more real test data instead of guessing where the opportunity may be.
Old 07-09-2010, 02:02 PM
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