Originally Posted by Buickman104
Is was wondering if...
You checked your coil packs? Due to age they may not be providing a hot enough spark.
Do you know at what milage was the coupler last changed? Since your engine is such high milage I am curious as to how the supercharger has been maintained.
Also what is the peak boost you see at WOT?
All right. Sorry I had not responded sooner. I replaced the coil packs to GM stock (unknown bottom color) coils, brand new, at 27X,000 miles. Still in the 70s but earlier, I had the supercharger'* coupler replaced, and I'm not sure about the coating of the rotors.
At WOT, I get a hair more than 5 PSI. This is with a K&N FWI. Also, sometimes it feels as if I'm not giving the car much gas, but the gas pedal is down all the way. Even more rarely I get power when I don't really need it. Usually, though, I have little power below 3G RPM, but above it the car accelerates pretty well. I never drove it hard before the pipe swap because that was one of the first things I had "fixed." The muffler company did the 3" upgrade after talking to my friend'* dad. At this same time, the exhaust manifold was welded. They did a good job because it doesn't smell like gas inside my car much at all, but Seafoam revealed some tiny cracks they left behind.
I've got fairly decent fuel injectors because I haven't felt any problems. They should be GM stock-ish, but they're not as old as the car. The fuel filter has probably never been changed, so I'll get right on that.
Also, considering my performance so far, could I get a 2.25" pipe with a high-flow cat and a muffler to match? I've come to believe, after reading a few posts every now and then, that even flow and some back pressure is good for low-end torque. I'm guessing there'* a reason that I haven't found someone running less than 2.5", but I figured with all my manifold cracks but with a better-than-stock flowing exhaust, it would even out.