Thread: What is octane? KR? Explained here.

Originally Posted by 01gtprocket

Aboubt a week ago I see a no name truck pump gas at the cheveron . the same truck pumped at ampm... Then the very same day see him at the texaco.. I think gas is gas..

This isn't true. Unless all of those places were independent, they couldn't be getting the same gas, plus there wouldn't be enough in one tanker to fill three gas stations...

Each company (i.e. Chevron) refines their own oil, adding different detergents etc. Many people believe Chevron has better gas then other companies as well.

Plus if the truck was "no name" how would you know it was the same one...

is KR an issue for n/a engines?

short answer: yes.

Originally Posted by Hippo Machine

This isn't true. Unless all of those places were independent, they couldn't be getting the same gas, plus there wouldn't be enough in one tanker to fill three gas stations...

Each company (i.e. Chevron) refines their own oil, adding different detergents etc. Many people believe Chevron has better gas then other companies as well.

Plus if the truck was "no name" how would you know it was the same one...

No.

Originally Posted by tod1d

is KR an issue for n/a engines?

I had 8* of KR from the factory running on 87 octane, on a stock car with an intake/catback...which really do nothing but add noise.

36* Timing with stock manifolds...

And 91?

Wheeeeeeeeeeeeeeeeeeeeeeeeee

11.8-12.0:1 AFR.

It's a N/A motor.

Mike has close to the same timing with a leaner AFR.

Which is...possible?

I'm going to install 180 t-stat and plog this weekend to see if that drops the KR. I see 5* of kr when speeding up. Overall just not fast enough with my mods and hope these new ones make a difference.

180º is a waste of time and 10 bucks.

Stock is perfectly fine.

I ran 12.7 AFR and 35* WOT with no KR on 87 when i took the S/C belt off

Low compression FTW.

Originally Posted by tod1d

I'm going to install 180 t-stat and plog this weekend to see if that drops the KR. I see 5* of kr when speeding up. Overall just not fast enough with my mods and hope these new ones make a difference.

Are you running 87 still?

thats what the pcm is tuned for

No...pcms are tuned for higher octane. Go try 91 or higher. See if the knock goes away.