Hello everyone.

I was wondering if anyone has had an issue that seems to have popped up after tuning my 2008 VW GTI FSI. I get a weird large spike in timing pull whenever the throttle is applied especially in low rpms but drastically tapers off when I hold that throttle position so the load isn’t really changing. Another possibly related issue is when cruising at highway speeds it will also go into full timing retard (-12) when very small throttle input is applied. Full throttle power runs from above 3,500 rpm don’t have any or very little timing pull. Just trying to decide if the timing is too aggressive in the low load ranges or if I’m having an issues like false knock or even possibly a maf issue. I have been pretty stumped on this issue for a few months now, any help would be appreciated.

Fuel 91 octane, Load usually around 30, timing around normally 30 degrees btdc  after initial corrections, will post logs soon, my file but using eurodyne maestro, lambda at .93, Air intake temp is irreleavant, no codes for a bad knock sensor or short to ground but knock sensor is in an unknown. All I'm trying to do is find possible causes from others experience to go in a more direct route of diagnosing the issue instead of chasing my tail like I have for 6 months. I know there is a lot of variables that effect this issue just wondering if anyone else has fought a similar issue. The timing pull goes away as load increases after 30. Thanks for the reply.

After corrections?  So it's even higher at cruise?

It's not.  Heatsoaked manifold and then high load with no chance to cool?  It'll knock.

Too many unknowns.

Could be solved with a log and not 6 months.

Probably because timing request gets better.  % tuning?

By saying air intake is irrelevant im saying the timing pull does not change whether its -15f to 105f same amount of timing pull. the tune is running 91 at 5000 ft altitude so air density is significantly lower and 91 is all that is offered at this elevation unless your buying 50 gallons at a fuel distributer.

The car runs on methanol injection as well but for this purpose its not useful because at the load i'm getting the issues i'm not even in boost, still in 15 in/hg at the manifold. It runs fine at WOT.

I've seen what Hunter is describing. It was so long ago, I forgot what it was, but I believe it was on an MED9 Audi with an automatic...

Huh interesting, in/hg thats something I havent heard in a while