5ktq afraid to rev

[Steve Burke <sburke@wvu.edu>]

I've been chasing down a problem on my 87 5ktq for some time now, and I can't seem to
figure it out.  It simply will not make good power above ~5000 rpm.  It pulls hard from
3000-4500, then gradually tails off, and it takes several seconds to get the rest of the
way to redline.  I just shift at 4500, but my performance suffers.  Here are the details:
1.8 bar QLCC and wastegate spring
158,000 mi.
good WOT switch and WGFV LED blinks
ignition coil resistances good
IAT sensor seems good

new:
spark plugs, wires, rotor, cap
michelin man
vacuum hoses
air, fuel filters

There are no codes in the ECU, and it makes 1.7 indicated bar from 2700+ rpm.  There is <6
psi backpressure in the exhaust throughout the speed range.  My ECU works fine in my
brother's 5ktq, and his gives the same problem in my car.  I had the problem before the
ECU mods.  I don't suspect a fuel problem because the engine runs smoothly with no misses
or backfires under load, so I think it may be an ignition problem.  How is the ignition
control module tested?  The Bentley gives no help.  I think I may not be getting any
advance, which causes it to gradually lose power at high speed but not run poorly.  Any
ideas would be greatly appreciated.

		Steve Burke