What gas are you using? I was using 92 oct sa or holiday gas and i was getting 1-2 point knocks. Switched to BP 92 only reached a highest of .7 which only did it once but at low rpms and no knocks at high rpms. Switched to 93 Oct M&H now i dont log any knocks low or high rpms.

 

That log was after a fresh fill of Exxon 93. I am going to fill up in the morning again with BP 93 and re-log. I will see what that does.

 

OK so this morning I put a half a tank of BP in and then on my way home from work on the same stretch of road and about the same temp/outside conditions I logged another identical pull as the my previous one. 3rd gear 4500RPM to WOT to the top of 4th. This is what I logged. The high amount of knock at high RPM and the fact that it is consistant makes me think I need to have my map adjusted. Unless someone can tell me other wise.

 

i would like to see someone who knows more about this chime in.

scott your previous logs didn't show this, so don't you think it is BP and Exxon?

 

I'm still wondering if anyone has any dyno numbers from the Cobb Stage 1 map vs. the Perrin Stage 1 ....

 

^ I know the first two logs I did the most knock I had was .35 and only a couple times. Something I did notice though is that the same company owned both the Exxon and BP gas station where I filled up. There logo was on the pumps and both said could contain up to 10% ethanol. I am going to try again with Shell gas and relog to see if that changes things.

PS I am still waiting for Perrin to get back to me.

 

me too, but iirc the Perrin has a good bit more TQ especially down low.

 

yeah, i've heard that about the Perrin map as well.