lost boost after intercooler install?
#1
lost boost after intercooler install?
I'm posting for a friend of mine. He has a ATI P1SC blower installed in his car. He was running water injection before with a 4.25 pulley. He was seeing 8# of boost. We installed an intercooler on his car along with a 3.70 pulley. His boost guage is not reading above 5# now. We checked for leaks and found none. The motor is a 355 with afr heads and lt4 cam. He is running a vortec bypass valve. We tried the 4.25, 4.00, and 3.70 pulley with no change in boost. Any help would be greatly appreciated!
#4
I am running 2 evo bypass valves. I had a HKS blow-off valve which had a better poppet type seal, but, I had to modify it to a bypass type to recirc the air. Not installed yet, but, maybe this winter. As for the ATI tensioner, I had a P600B, and, moved to the D1 head. I am running a 7.6 -> 3.4" pulley combo which results in 13 psi running thru a large Spearco IC. I modified the tensioner assembly so that it would not unload the belt in off-throttle decel mode. This mod lowered the cantileaver load on the crank (less dialed in spring load), and, did not allow the tensioner to vibrate with large amplitudes. I think the standard ATI design is flawed (my opinion). My change works much better for me, and, is simple. Hope this helps. (97ss 383 - D1) B.
#6
Various pressure gage taps @ different locations in the pressure circuit. ie... Press tap @ (compressor and IC inlet) IC outlet, IC outlet after bypass valve, Intake manifold. Multiple press gage(s) is ideal, but, it's alot of hardware.
#7
cant you just disconnect the ic pipe from the tb and cap it, then disconnect the ic pipe from the compressor and cap it with a pvc end cap with a scrader valve to pressurize the whole ic system and monitor pressure drop as well as spray the connections with soapy water and look for bubbles, this is just the way i used to do it
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dbusch22
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10-31-2016 11:09 AM