I have a few questions for you guys.

My motor is ~10.5:1 compression. I run 93 octane pump gas. My headers are also VERY close to the frame rails (A-arm mounts). Occasionally, the motor will stumble below 600 rpm's at idle and this causes the infamous "header knock".

Question #1 : does the knock sensor pick this up and then hence retard timing further making the car run bad at idle due to lack of timing and running rich at idle?

Question #2 : occasionaly, when it's really hot outside, the KS is picking up slight detonation at cruising speeds (not WOT) according to the scanner. If I run 100 octance Sunoco race gas, would this correct the problem. What would the pro's and con's be with running race gas in my speed density setup (other than price). If the car is running pretty good now (for the most part) on 93 octance and I switch to 100, would I have to change any tables in the PROM?

Question #3 : If the race gas does fix the knock sensor issues (as far as it yanking out timing), then could I get away with limiting the knock sensor to only pull out 2*'s max across the board in the PROM?

Thanks,
Mike (1bad91Z)

 

Some of the codes have a min engine speed to detect knock, so that at idle the timing isn't pulled back, you need to read thru what you have, and see what it has.

2) Why not just take a little of the timing out in the cruise mode area of the timing table?.

3) The knock sensor is a fail safe for a lousy tank of gas, for the way I tune my car, and its easy to get a load of lousy gas, and get 8d of retard. Limiting it to 2 means that 8d would still be 6d past what the ESC could protect yourself from. I wouldn't do that. I run 30d retard limit in PE, and 15 in none PE, FWIW

 

Race gas would take care of the low octane knock retard table right?

Also wouldn't it clear up some of the KS retard where the timing is a little aggressive?

I dunno, since carb'ed motors dont use knock sensors, I just wanted to limit the ammount of timing that the KS controls across all the tables.

Would disabling Knock sensor diags (in the constants table) disable all KS capabilties? Or will the other KS tables still control timing and still function?