Tuning Is Stupid

[Pushit2.0]

Does the knock go away at all, or is it just 40some whenever you are on the gas? what kind of timing do you have, does the car feel fast? My guess is the computer is seeing to much air flow, try taking 5-10% off the afc, see what happens. But it does no seem right to have knock down there, you should not have full boost down that low. Check the knock sensor, ither loose or dead. My car right at 6500rpm goes from no knock to 35ish, but still has 10deg of timing and made good power so I dont worry about it.

~John

[95tsi]

does it knock if you hit a big bump? might have somthing rattleing around the engine bay. Just a thought.

[Jacek]

the knock goes away. i tried leaning myself out so my trim was into the 120s and it still just hits that spot, takes a dump, then starts to move again. I dont have full boost down there, its when i go past a certain amount of throttle that it hits the knock and when i let off and go past that amount of throttle it just isnt there (or when i begin to boost). No it does not knock when i hit bumps.

[JET]

What is the high/low throttle settings on your SAFC (the change over point)?

[Shane@DBPerformance]

How you tried turning your base timing down to 0 base or lower?

[Jacek]

Yes I tried turning my base down to 3 degrees and that didnt help.

Good news, I checked the plug gap/condition today and my gap was a little small and the plugs looked like crap so i changed the plugs and wires and from what I have tested in town is there is no knock. Tomorrow I will see what it does on the highway where the big test is.

[Jacek]

Hey guys,
The plugs and wires situation did not solve to problem. Could the EGR valve be making enough noise to cause the situation? It is just an though.

[LightningGSX]

Originally posted by Jacek@Jul 21 2004, 11:01 PM
Hey guys,
The plugs and wires situation did not solve to problem. Could the EGR valve be making enough noise to cause the situation? It is just an though.
I doubt it.Have you inspected the knock sensor itself, or more importantly the EMI shielding around the harness? Did you make sure the shielding is grounded?

What the hell is the 2g MAF screw? And why did you turn it all the way in?

Its seems to me, your karman counts are fucked up enough as it is(AFC,lower base pressure, 2g MAF, whatever screwed you turned all the way in), you should put back the 1g MAF, set your FP where its supposed to be, and use the AFC only(with mild corrections) and see if this eliminates your problem.I think its either the sensor itself or your load/timing points are just way screwed up.What timing adv are you getting around the point when the knock shoots up?

[john]

When was the last time you replaced your fuel filter? A kid on here (boostedgsx or something) was having a similar problem but he would build knock at ~4XXX rpms all the time. I was trying to tune his car and couldn't get around it (doesn't say much though...). He replaced his fuel filter and all was fine. Just a thought...

[Jacek]

spring time i changed the filter