I just finished breaking in a new 2.3 motor and my compression is now 9.1 (vs. stock 8.8). My AFRs are 10.5-11.0, timing is conservative (4-8 mid, 17 redline), and boost is 20 psi peak but I'm still getting some knock--according to my UTEC.

How much does the higher compression affect timing and knock? I already backed my old timing off 2 degrees where it was knocking but it's still knocking.

TIA

 

Starting at 11 and richening to 10.5? Try getting a little bit more fuel in there goto maybe a 10.2 -10.3 in the knocking area.

ALso you are using the knock sensor that came with the utec? If i remember correctly they will not read right off the stock unit.

 

Post a log?

 

Just wondering, where you told to go with a 9.1 to 1 ratio by a tuner or did do this on your own?

Scorke

 

It's an RnR 2.3 and 9.1 is standard on all their motors.

 

Strokers need a good bit less timing. Dont be afraid to keep backing timing down. Small timing numbers are a good thing, less pumping losses.