GPM change with lower compression

GPM change with lower compression


548 BBC, 13:1cr, 28 degrees , Littlefield 1471 K11, going down to 11.75cr, how much fuel would you pull away to keep the tune up similar? 9.4gpm to the motor right now.

Im thinking of .3 less just for starters. Any input?

 

9.4 gallons? How long of track, is this a sand dragster?

 

Door car, 1/4mile, and yes 9.4 gpm tune up

 

I would consider adding a degree of timing, not changing the fuel, and make a lap. Your plugs should show you where to go.

 

I think your pretty close by taking out .3 gpm. By my figures you'll still be a little rich. If it were mine I would probably take out .3 expecting to take out a little more.

Why are you taking compression out?

 

Thanks for the comments



Why? I’m a victim of the “ your running HOW much compression” LOL

Truth be told, it ran fine… but thinking I must be fat with no color on the plugs and Im looking for more performance, I take .2 of a gallon out of it, and it goes from no cad burn to ¾ of a ring. I dunno, Not enough laps for me to come to a good conclusion on where my tune up is really sitting.

So far the relatively new combo is an underachiever IMO and I want to “lean” on it for a lack of a better term, and feel the lower compression will be more lenient. Hopefully I don’t make this thing a turd by taking out static

Input

 

Flowed fuel system from Davenport. Using Jetsize, Im putting 9.4gpm in the motor at 3000feet DA

Its 24%over, and patheticly I dont have the boost numbers at 8000rpm, no data logger yet. Hopefully the combo gives you a few hints on where it typically should be. (cough cough , going to guess 25psi)