way to test wastegate?
#21
Re: way to test wastegate?
ghettoturbo is right, its gonna change somewhat when you have 35psi of hot *** exhaust gas pushing on the wastegate flapper. Remember, exhaust manifold pressures can normally be 2.5 x the psi of boost you are running...
#22
Re: way to test wastegate?
Originally Posted by accordepicenter
ghettoturbo is right, its gonna change somewhat when you have 35psi of hot *** exhaust gas pushing on the wastegate flapper. Remember, exhaust manifold pressures can normally be 2.5 x the psi of boost you are running...
Figure out your manifold pressure and go from there. I had a car once that my manifoold showed somewhere around 35 psi, but the pressure ratio stayed the same acrossed the turbine with the stock exhaust or aftermarket. I added atmospheric pressure of around 15 psi (14.7 if you're a stickler) which gave me in the neghborhood of 50 psi of backpressure in the manifold.
Stock, I tested around my cat and got roughly 22 psi (which would be 7 plus 15) and a pressure ratio of about 2.25:1
Where it gets interesting is that in doing a turbo back, I took out 4.5 psi from the exhaust. Add atmospheric pressure back in 5 + 15 + 20 psi X 2.25 and I got 45 psi. Subtract atmospheric pressure and I now had 30.5 psi a drop of arounf 4.5 in the manifold....where it matters.
Do yourself a favor and make yourself a backpressure tester.
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