jetting carb
 

i have a jetting ? when the weather gets hot do you go up(rich) on the jet sizes or do you go down(lean) and ideas. 1/8 mile drag car with sbc running 114 sunnco race fuel.single carb 850 holley hp

Down

X2

hot weather
 

what do you guys do with the timing in the real hot weather. up, down, or leave it as is ? thanks chevy art

When the weather gets hot or the altitude goes up, the air gets worse so you can't burn as much fuel so you need smaller jets. I usually only alter the jetting two sizes.

I only alter the timing when the car is over powering the track (retard it 1 - 1 1/2 degrees. If I'm wanting to set her on kill I advance it 1 - 2 degrees. Just make sure you're checking your plug condition after each run to avoid detonation etc.

over powering the track= spining the tires?

Yep. Some tracks aren't prepped that well. With a glide, convertor and nitrous motor there aren't too many options to get traction without losing too much power.

I never mess with mine. I leave it the same all the time.











Of course I also lose in the first round most of the time too. :lol:

I agree, hot/humid weather likes a leaner A/F ratio.

Jetting it down will aslo make it more consistent if you race where theres a temp drop from TT's to elims , E.G> daytime TT & nighttime racing.



I jet for consistency - not power/ET.\

Cp