WOT problems

[Vandal_RS]

My 92 Legacy SS is having issues at WOT.

The motor is stock, and has about 120k on it, and is attached to a 5-spd. At partial throttle, the car feels great, has plenty of power. At WOT, the car falls on its face. It is significantly faster at 50-60% throttle then 100%. If I floor it, then slowly let off, it actually lunges forward for a split sec. The problem was significantly more pronounced when the weather was very cold. My guesses are a bad knock sensor, clogged cat, or maybe a failing boost solenoid. I don't have a boost gauge in it yet, but I should have a revscan cable by next week that might help shed some light on the problem.

Anyone have a similar issue before? Any guesses?

I had similar experience with an 88 supra turbo, allow though that car would fall on its face as soon it saw over 3 psi of boost. It ended up being a bad knock sensor, clogged cat, and bad o-rings on a couple of injectors.

Thanks a lot!

[Vandal_RS]

I forgot to mention that I have gutted the mid-pipe cat. It didn't show any sign of a deteriorating downpipe cat, but that doesn't mean it isn't happening I suppose.

[cj91legss]

check your fuel pump

[Vandal_RS]

Will do. I am picking up a used one tomorrow in fact (much less used then mine).

[subydaddy]

Make sure the recommended spark plugs are in there too, that was my problem, which sound exactly like the problems you're having.

[wtdash]

And the 'revscan' cable is coming from someone other than Revtronix, I hope? The Revtronix.com site hasn't been 'active' for months....even though it's viewable.

[BSOD2600]

The subaru EvoScan cable works with EvoScan AND RevScan (I have it).