Quote:
Originally Posted by Phantom
Would we measure from the intake valve to the turbo?
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No, you would measure from the intake valve around most bends all the way back to the first and pronounced surface that the wave can bounce off from.
Some vehicles its the inside of the plenum, others like mine its another valve on a different cylinder.
I have a feeling a plenum would give the best wave return.
Quote:
Originally Posted by Phantom
Also is there any way to calculate the change in the harmonics in respect to length of the runner with an increase to boost?
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It would be easy to figure out, but the temperature is always changing under boost even if the pressure is not changing. Intercoolers start off working real well then get heat soaked and as you get up to speed they loose heat so its a cluster. One intercooled engine does not run the same temperature and boost as another.
Roughly every 10psi or at least for the first 10psi you add will cause the air pulses to slow down to the point where the air in the runners will behave as if the runners are about 10% longer.
I only worked this through 10-15psi because this was originialy for a gas application and I could only find post intercooler IAT numbers for the 10 to 15 psi range.