Any turbo gurus out there?
I have an '88 Ford TurboCoupe, T3/T4, ported head and intake, 65mm TB, SDS computer, 3" downpipe, SVO roller cam, 3.55 rear, C4. The car ran good for about 6 mos, running up to 20lbs of boost. I now, all of a sudden, get a strange fluttering noise when I back out of the throttle slightly on boost. It almost sounds like the compressor release. I disable the comp' release, but to no avail. I also disabled the boost control, but to no avail. The noise seem to be coming from the comp' inlet. Could the compressor be surging? If so why now, all of a sudden? Any help will be appreciated.