i was doing a few pulls tonight and noticed that my car is pretty lean 1st through 3rd gear. the AFR's are mid to high 12's. but once i did a pull in 4th gear the AFR's were perfect. i dont understand how its being leaned out the first 3 gears.

it has gotten pretty cold around here, will weather have an effect on this? do i need to adjust my MBC for the colder weather?

the car was tuned perfectly by CBRD. i know the tune is not the problem. im just looking for some things to check for or some help on what to do.

 

I see that you have a few stock parts. What other mods are you running? What system are you using to measure your AFR?

 

im using my AEM widebandto get the afr's
and it was dead accurate to the afr when it was on the dyno

just out of nowhere i noticed its leaned out. but then again it just started getting very cold around here. im thinking that has something to do with it

 

maybe the tunes falling out?

 

I highly doubt it.

 

the issue is, that is always going to happen...

and its ok...generally the load is different through each gear.... we try to simulate heavy load on the car with the dyno tuning....

In the shorter gears youre going to ramp through the map quickly generally most of the time you want see as much sustained boost in those gears.....

this is completely normal.

cb

 

thanks chad