So, lotsa knock in 2nd gear, but clean in 3rd and 4th...

[EfiniX]

Very intermittent, so I'm thinking PK. Right now, my link threshold is 3750/40%, which seems plenty high (in both RPM and TPS) for me. Are there other things I should be looking at? I know vibrations will cause issues, but with poly bushings all around, I can't think of what else I could do.

That, or it's just part of having this car and I live with it /ubbthreads/images/graemlins/smile.gif

 

[GSTwithPSI]

Log...

 

[tektic]

I just alleviated some knock by adjusting my intercooler couplings. one was tapping the a/c line. Touch everything in your engine bay and shake it. If it makes noise or touches something else then fix it.

 

[EfiniX]

Quoting GSTwithPSI:
Log...



I know, I know. Coming up tomorrow. I need to re-gap my plugs tomorrow morning and do some pulls.

 

[EfiniX]

And here we go. I ran a number of WOT logs over the weekend, nearly all in 2nd gear. I was feeling a fairly pronounced stumble when experiencing knock. Not nearly as bad as when I had an injector going out, but still, noticeable. Now I'm not sure that I'm feeling ~7 counts of knock, or if I'm havin spark-related problem and the knock is just a symptom. Even on clean runs, it feels a little rumbly. Hard to quantify. The car doesn't abruptly lose power or anything. it just feels like I'm driving over a bumpy bit of road.

I got new NGK wires about 18 months ago, but I've done a lot of work since then, and I'm not opposed to considering that they might need to be looked at. If I have time today, I'll test their resistance.

Or maybe it's just knock. In anycase, the car is getting dialed in!

click

 

[Gtpdz]

The high knock threshold is for getting rid of the knock I guess? 3350rpm and 40% throttle, let us know how this setting works out. I'm also trying to get ride of a similar knock issue.

 

[EfiniX]

Not really high for my car. I've got a T3/T04 with a boost threshold ~4300-4500rpm's. It depends on the gear, really. In the 2nd-gear pulls I posted, you can see I'm not cracking 20psi until ~5k. 3rd and 4th, it gets a bit more reasonable.

Now for a stock turbo, I think the threshold is sub 4k, so yeah, my knock control settings would be really aggressive in that setup.

 

[Gtpdz]

I see... I always thought it should be handle with caution when it comes it ignoring knock, looks like I should go a bit aggressive on that. I'm having a .60 bb gt37r so it has a similar spooling(lag) characteristic, I also get up to full knock count around 2000 - 3000 just when it start to build positive pressure with very moderate throttle.

 

[EfiniX]

Assuming your timing map is pretty much stock before the RPM's where you start to spool, you should be ok. My rule is that I don't touch timing below my knock sensor threshold.

 

[Gtpdz]

I can see that from your log,for me I did pulled 1-2 degrees around the spot just before the spooling...didn't make much difference though but I guess it won't do much harm right? /ubbthreads/images/graemlins/crazy.gif