I'm running a 100 shot for the first time. My first few runs put up a consistent 10.7 AFR (I know, too rich). It's a TNT F1 kit. Do I just put in the next smaller fuel jet (75 shot) to lean it up a little or will this be too much?

Also, I pulled 5 degrees of timing for the initial tune just to be safe and to my surprise I had 2 degrees of knock retard on the inital hit. It decayed away during the run and didn't come up again, but it happens each time when the system first kicks off. Timing was 23 down to 17, then back up to 20 by the completion of the run. I live in CA so I'm running crappy 91 octane gas. Would you guys pull more timing or is the knock retard being triggered by the initial lean spike?

 

I would try and get a size thats in between the two fuel jets first rather than go a little lean especially if you are seeing a little knock allredy. Also i would go a head and pull 2 more degrees out if you going to lean it out and its knocking now. But if you leave the afr where it is i would just take 2 degrees out of the rpm that its knocking and leave every thing else where it is.

 

Make sure the AFR table isn't pulling timing from going rich

 

Something i forgot to ask what was bottle pressure on the runs if it was lower than what is suposed to be that will make you run rich too.

 

Tnt Used to recommend 950 psi. So really 950-1000psi should work fine