Thread: Learning to tune

Originally Posted by Mitch R

Yes, I have downloaded the tune from the PCM to get started. I'm going to check out the mounts, flip them if they haven't been and try again. Also, picked up new NGK TR6 spark plugs today, I plan to install them at the same time. The ones in there now are old.

I just put in a set of NGK TR6's in my car, should be a good plug. I ran autolite 104's for a long time and just wanted to try something new. overkill suggests a gap of .045 for most cars. if you have a misfire that would cause kr for sure. those plugs won't last much over 10,000 miles.

if you look at your good fuel spark and in the bottom corner, where it says 6400 rpm and mg/cylinder 680, that is the most airflow you will get at the specified rpm, so depending on how your timing table looks, that whole bottom right corner could be adjusted so it reads less timing. you don't want to go lower than 10.

edit: my tune is different so the commanded timing matches the timing in the spark table. makes it a little easier to make adjustments that way.

edit: I guess kr without boost can happen even without power enrichment.

Originally Posted by Swiggles

Naturally aspirated cars get knock too

when I was n/a, with an L67 bottom and xp cam I never saw any knock. i'm sure that i'm the exception though.