hooked up a scan tool i got from school.. and im getting 32* of knock retard at 5050 RPMS.. running 89 octane.. !!!! i know there are alot of things that can cause knock.. but where should i start??

oh and i am currently making a chart with all the things i got off the scan tool that i will post later.. but for now if u wnt to know anything specific just ask and ill post..

 

Does all of this retard come in all at once, or is it starting to detect knock and retard the timing gradually and just ends up at that point? Try running the tank almost completely out of gas, then put in a few gallons of 100 octane race gas. See if the knock goes away, or at least down. This will help you sort out whether or not it is false knock.

 

mine does that. but i have a nasty vibration when the motor reaches 4000 rpms. do you here the knock? if not then it may be false. the headers are hitting the frame of the car on mine. so when the motor reaches 4000 rpm, the headers are sending a false knock through the motor.

 

it starts to have about 20* at 2500 rpms and slowly goes up to 32* at 3800

ill have a graph later today\tomorrow

 

hmm i also have a nasty vibration. .thats almost harmonic.. no i don't hear the nock.. but the exhaust is loud and windows are down.. i also have headers which are pretty close to the chassis.. ill maybe have to take a grinder to it..

thanks

 

Thats an awful lot of retard to be getting, especially at that low of an RPM. What is your base timing set at? Is this with a stock chip?

 

base timing around 16-20* haven't checked it in while.. yes stock chip..

 

You've got way too much base timing! Stock is 6*. At 2500, the computer is tring to add between 20 and 36* depending on the load. You're ending up with too much total timing, so the computer is retarding it. Cut the base timing down to like 10* and run some premium fuel, then see how it does.

 

ya.. ill recheck the base timing tomorrow.. and start a new post with all the other information i got from the scan tool.. thanks alot guys!!

 

Is that with the EST wire disconnected?

No wonder you said that it was running bad.

 

yes that is with the EST wire disconnected. i am goign to recheck it today with both a timing light and the scan tool.

And phil, im working on some other data that im putting together in charts and stuff that im going to post later (at the NTTGA forms) that i want you to look at..

 

So have you figured anything out? I am having a problem with an insane amount of knock, too.