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02-04-2011
I have been having high kr issues and cant seem to figure out why or where its coming from mods are as folows fwi, sd headers, al 104s, intence pcm, 3.4 mps, just put a new snout on due to the bearings going bad replaced the coupler at that time as well! i use 93 octane fuel any ideas where to start or ideas whats going on ?
02-04-2011
what are you using to monitor KR?
Have you tried throwing some octane booster in to see if it changes in level?
02-04-2011
i have a aeroforce intercepter and no i have no tried octane booster i seem to see kr around 7lbs of boost and up and kr is any where from 3 to 7
02-04-2011
are you running a cat?
try the octane booster.
Though you'd probably see KR before that if it was false.
Still worth a try.
02-04-2011
How cold is it?
Colder denser air = leaner mix...
could be why you're knocking....
Like my car knocked a little when it was below 40...and when in FL, it never knocked.
02-04-2011
yes i have a cat i replaced it the old one when i put on my headers. i will give the octane booster a try but i dont think its going to help.
02-04-2011
you could be leaning out and thats causing you to have KR or it could be false.
But seeing as its only above 7 PSI i'd say you're leaning out.
Octane booster will help you "get by" for now.
02-04-2011
its been below zero i have not had warm weather in a while so no whay to verify that if warmer wheater is any different till spring lol
02-04-2011
do you mean you replaced it WITH the old one, or you replaced it with a new one??Originally Posted by Hawkman
02-04-2011
i willl have to see what the octance booster does in terms of kr if it takes it down some then at least i will be on a path thanks.
02-04-2011
Ahh, well...again, you will knock like hell if its that damn cold, and you're not tuned for it being that cold.
Basically when the air is colder, it's denser. So the air density changes, and the fueling doesnt. So you create a lean condition...causing knock.
One way to test would to be hook up a A/F gauge, and see what she says.
02-04-2011
i replaced the cat with a new one when i did the header install
02-04-2011
ok so basically stay out of boost in winter lol
02-04-2011
yes. i saw a 5 psi increase in boost in the winter. also, your timing is higher due to the lower temperatures.
02-04-2011
Yeah, you boost higher, which = more heat...which = more knock.
Just stay out of the throttle, or you're gonna go boom.
02-04-2011
I'm surprised no one has asked what year your car is yet. If its an 04+ or Gen V equipped your KR doesn't surprise me at all. And some cars just knock more than others. Also you have an intense tune which is known to run the most timing out of all the can tunes which would make it much more likely for you to knock.
02-04-2011
Fwiw the car will make some fuel adjustments for the temperature change. I depends on what the IAT sensor sees before the throttle body. This was a reason I tried the modified sensors a few years ago and people thought I was crazy.
See what your timing is during the knock. Then watch your fuel trims to see how positive or negative they are.
02-05-2011
octane booster is fun if you use the right stuff
02-14-2011
It is a 97 with a Gen III supercharger on it.
02-14-2011
vac leak?
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