Ya Mahn
Veteran
With a stage 1 supercharger, I am running 137.5 main jets @ 1200ft above sea level. The engine is running rich. Did anyone go up a jet size with the super charger or is it not needed?
rxboost05
Veteran
How many lbs. boost ? I am running from sea level to about your elevation @ 10lbs, I started with 127.5 but was lean. i went with130s and #20 pilots and now seem to be around 11.5on the a/f at wot. From what i have been reading and what i have been told on this site, 137.5 seem big. are you running an a/f wide band? I am sure you will get more replies on your post.
Trxster
TY 4 Stroke Junkie
Every sled is different, and the air,temps, altitude you ride changes. Get an A/F gauge rather than guess blindly at it. That can be a costly mistake. You will feel a lot better knowing that your jetting is "spot on" rather than hoping it is correct based off of what others do. Good luck.
Rt
Rt
snowy1
TY 4 Stroke Guru
get a wide band, I have never seen a motor that whats such drastically different jetting from one motor to another, for example I have seen guys running from 125,s to 145 mains at 10,000 ft. with o2 sensors saying thats what the motor needs. some guys have the needles all the way down others all the up.
BlgsRX-1mtn
TY 4 Stroke God
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Ya Mahn said:
I actually had to go down with my main jet sizes from 135 to 127.5. This got my A/F readings right @ 12.6 during WFO runs @ 3370' elvations and 11.9 @ 10,000' elevations. Like others have said though; if you don't have one allready, get a O2 sensor and Wideband guage to make sure.
Jim
