I just installed a MBC on my stock 91 TSI AWD that i picked up for $500 with 155K. Tell me what you think of this log. I couldn't get to redline because i was coming up on another car really quickly. I am only getting 3 counts of knock. What is an exceptable amount before engine damage occurs?


RPM TIMA KNCK O2-R
2313 29° 0 0.00V
2281 38° 0 0.00V
2281 38° 0 0.00V
2281 38° 0 0.00V
2250 38° 0 0.00V
2250 38° 0 0.00V
2250 38° 0 0.00V
2219 38° 0 0.00V
2250 37° 0 0.00V
2281 37° 0 0.00V
2219 37° 0 0.00V
2281 34° 0 0.00V
2188 24° 0 0.21V
2250 24° 0 0.68V
2313 24° 0 0.70V
2344 24° 0 0.70V
2375 24° 0 0.72V
2375 23° 1 0.72V
2406 22° 1 0.72V
2438 21° 1 0.72V
2469 22° 0 0.72V
2500 23° 0 0.72V
2563 22° 0 0.72V
2563 22° 0 0.72V
2594 21° 0 0.72V
2656 21° 0 0.72V
2656 21° 0 0.72V
2719 20° 0 0.72V
2750 20° 0 0.74V
2781 20° 0 0.74V
2813 19° 0 0.74V
2875 19° 0 0.74V
2938 18° 0 0.74V
2969 19° 0 0.76V
3031 18° 0 0.76V
3063 17° 0 0.76V
3156 17° 0 0.76V
3188 17° 0 0.76V
3250 16° 1 0.76V
3281 15° 1 0.76V
3375 15° 1 0.76V
3438 16° 0 0.76V
3500 17° 0 0.76V
3531 17° 0 0.76V
3625 17° 0 0.78V
3688 17° 0 0.78V
3750 17° 0 0.78V
3781 18° 0 0.78V
3844 18° 0 0.78V
3906 18° 0 0.78V
3969 18° 0 0.78V
4031 18° 0 0.78V
4094 18° 0 0.80V
4156 18° 0 0.80V
4219 18° 0 0.80V
4281 19° 0 0.80V
4344 19° 0 0.80V
4406 19° 0 0.80V
4469 19° 0 0.80V
4500 19° 0 0.80V
4531 19° 0 0.80V
4656 19° 3 0.80V
4656 18° 2 0.82V
4750 18° 2 0.82V
4844 17° 2 0.82V
4875 17° 2 0.82V
4906 17° 1 0.82V
4938 17° 1 0.82V
4969 17° 1 0.82V
5094 17° 1 0.82V
5125 18° 0 0.82V
5188 19° 0 0.82V
5250 19° 0 0.82V
5281 19° 0 0.84V
5313 20° 0 0.84V
5344 20° 0 0.84V
5406 20° 0 0.84V

3 counts won't hurt you, especially when the logs show that the when the ecu pulls back timing a degree or two it drops your knock count back to zero. Get worried when your knock count increases no matter what the ecu does. That means it's time to dial back the boost.

ok...i just wanted to make sure 3 counts was ok. You think once i rewire the pump, those counts will possibly disappear? I have a walbro 255, but i am just waiting on getting the $ for a AFPR and a SAFC.

That should work, but if it doesn't, three counts isn't anything to lose sleep over.

The fact that your o2 reads 0 before you go WOT is a good indication that it's time for a new one.

Also I would spend my Money on Intake/Exhaust before an S-AFC.

CanadianTSi said:

The fact that your o2 reads 0 before you go WOT is a good indication that it's time for a new one.

Click to expand...

Yeah, but look at the timing. He probably was off the throttle. When coasting in gear with no throttle, the ecu shuts off the injectors to save fuel. You won't see any voltage on the O2 sensor when the ECU does that.

Quasimondo said:

Yeah, but look at the timing. He probably was off the throttle. When coasting in gear with no throttle, the ecu shuts off the injectors to save fuel. You won't see any voltage on the O2 sensor when the ECU does that.

Click to expand...

Good Call.