So, I've been spending several hours per night tuning my car, and I've got it dialed in really well for normal driving. I can't seem to get the car to not knock though once it hits full boost and starts climbing RPMs. I've tried adding more timing all the way up to 11* at redline, and as little as 2* (which I know would be too little), and I CAN'T clear up the knock no matter what I do.

I attached my ROM, I'm running 2D SD with an OMNI4-Bar, GM AIT, Spool AIT to MAF harness, and I'm on 93oct.


Here are my mods:


Buschur 2.1L 10:1 comp.
Hand-ported head, ST bronze valve guides, ST Std valves, ST dual springs/Ti retainers, GSC S2 cams, Top Line lifters (bit noisey), Kiggly HLA.


Buschur cast HTA3582R kit w/ Tial 44mm external dump, PTE 1200cc injectors, Walbro 255lph.


Torque Solutions 3-piece solid mount kit.


Logs:

 

Your timing map load scale does not match the load shown in your logs. Youre in desperate need to rescale the timing and fuel map load axis. Also your timing map needs a lot of smoothing. Dont try to hit your low timing for peak load as soon, instead it should be a slow taper to the point of low timing for peak load.

your load axis only goes to 350 where as youre hitting 400+ load..

the KPA on the load doesnt mean the same KPA that is in your VE tables on the KPA side, that actually references the load from the listed KPA value. I dont understand the non linearization in that respect.

If i were you, I would tune wastegate pressure and increment from there

 

timing map should appear to decrease with boost and increase with rpm.



follow this trend, youll Find the sweet spot .. I'm still looking myself

 

Can anyone comment on wheather or not those load values even seem legit in relation to the tune? Is it possible that the load values would be in the range of 440?

 

No. The load values should be closer to what his Boost column says. They wont be the same depending on how the kpa-load table is done, and Im pretty sure there are other calculations that effect it. My 1b load is the same at some points and up to 20 higher at others than my logged kpa. But it just depends on how you go about using the speed density tables. Some match maf load, some start from scratch. Hammon, what load did you hit on the maf?

 

I don't think he had a maf tune. From what I gathered he was scratch tuning

My kpa load table is linear but I see a serious amount of deviation at times. Way more than 20 lol

 

Yes that is real knock.

Aaron

 

Is knock from too low advance just as harmful as too much?

 

I've spent a lot of time working over my timing map, and still am picking up some knock in some spots, but keep working at it. Anyone have any thoughts on why I am picking up knock here?

 

I'm wondering about this as well? Any update on this thread?

I'm also receiving some knocks and I'm not sure if this is dangerous or not? This was logged as I was DD'ing my car to work in this morning, and the spike was hitting 25psi @ 2nd gear :



Any advise would be highly appreciated.

 

Im pretty sure the car wont log any higher than the highest load value in the kpa-to-load table. Kind of like a load limit, which is set to 340 in his ROM.

What is your Load1byte formula in evoscan?I see that its 1.2 in your ROM. is it 1.2*X in evoscan?

-Jamie

 

In that last screenshot, were you really at 44% throttle or is that not reading correctly?

-Jamie