N/Apower

Yeah, you better leave. Don't want anyone here who has REAL! mustang-dyno numbers. Only supposed estimates and guestimates are allowed here. And only if your friends own their own dyno's but don't let you use them.

Johnny Sack

brace yourself.....

N/Apower

Looks really good man.
I would however suggest a tune. You get kinda lean up-top and are a bit rich down low.

Maybe S2K's like to run rich down low to help with tq, I dont know. 13.9 and 13.5 DO sound kinda lean though.

Is this just my ignorance in AP2's and the A/F's they like or what?

EDIT:

Did you go to vegas and get his friend to do that dyno run for you

Enthralled

Can't we all just get along...?

Johnny Sack

i am tuned. i think you've confused AFR values. the higher the number the leaner the AFR mixture is. the lower the numerical value the richer the mixture. 13.9 is VERY lean by S2K standards, but my motor seem to like it just fine.

stock AFRs run in the low to mid 12's.

N/Apower

no, not confused. Some motors like to run rich as it helps with tq in some situations. I saw that you were as rich as 12.5 or less down low and as lean as 13.9 on one of your runs up top. I know you make good hp with that 13.9:1, but you are REALLY risking that motor imho. What were the KR values with 13.9:1?

Johnny Sack

i dunno, i only kept this sheet from the dyno. honestly it runs like a champ at 13.9. no detonation, knock, nothing. some motors like the lean. i think it helps that i always run the same fuel in it, chevron 93, keep the motor running consistant.

N/Apower

who knows, maybe your internal dimensions are SOMEWHAT different for some reason. Maybe you have ZERO carbon on top of you pistons. I dunno though man. 13.9 on a high rpm, high compression motor is asking for it imho.

Johnny Sack

its been running at 13.6:1+ for about a year now and shes still strong.

N/Apower

I have heard of LS1/5.0's that have run just fine and when the heads were taken off the owner noticed signes of detonation and pock-marked pistons and had NO CLUE! why it was the way it was. No KR or ping, or knock or anything. I would be careful is all I am saying.