knock question

[qwiketz]

when you get knock, does it spike the reading of the o2's higher or lower? I'm currently seeing 02's in between 850-900 under wot in my Corvette. The only knock activity is when I punch it and it's 1.1* or less and quickly drops down to 0* after about 4,000 rpm. Am I on the right track? I have not got an a/f reading yet on the car.

I'm running a 50/50 mix of h20/meth. I don't run an intercooler or aftercooler other than the alky, so I"m using this system for both the octane and cooling effects.

 

[Razor]

If you stomp the throttle and see knock immediately that goes away.. its a tuning deal. Too much timing, too little fuel, or it can be false like timing chain, exhuast, motor mounts, etc..

 

[Razor]

Wanted to add.. having a system that fires(turns on) too late can also exhibit this condition. Plus using water/mix... its an uphill battle.

 

[qwiketz]

I'm seeing at most 1.1* of knock upon tip in. Is this that bad? usually it's in between 2000 and 3500.

I need to get a wideband...

 

[DMan]

1.1 degrees of spark retard on tip in is not much to be concerned about. Its the sustained, high retard at high load that kills you.