Car running lean

[Meydron]

Well yesterday i installed my hiboost FMIC, AEM wideband and greddy profec B and the car is running 14-15 AFRs. I thought this car was supposed to run really rich? No check engine lights or anything, any advice on whats going on? Only other mod on the car atm is CAI, and i was not hitting boost cuz i was afraid of blowing it with those AFRs.

 

[Maxx Mazda]

What's your boost set at man? Also, unless you are under boost, you will get AFR's liek that.

 

[Kansei]

Yeah until you go into boost that's pretty normal.

 

[Meydron]

Alright thanks, i am trying to set the greddy for around 6 or 7 for right now so ive been fiddling wiht it a bit, i didnt know it would run lean outside of boost so i thought if it was lean then it would be really bad in boost. Thanks a lot

 

[Kansei]

14 isn't lean, so no worries.

 

[Maxx Mazda]

14 is lean for a forced induction car. But not bad while under vacuum. Tramp on it and your AFR's should dip WAY rich into the 10's or 9's.

 

[Meydron]

Yea it goes to 10 flat when i boost. But i got a couple other questions, what kind of vacuum numbers should be displaying on the boost controller. Its only at 100 right now, is that right or do i have a vacuum leak? and no matter what i set the boost level at it wont go past 6 psi. Any ideas? Thanks

 

[Maxx Mazda]

Well you should have a boost gauge. It will read around 20 in hg in vacuum under decel load.

Sounds like you have a vac leak to the profec somewhere. Check all your lines, and be sure to use clamps on all of them.

 

[Kansei]

Mine hits 30 when decelerating, 25-27is at idle last I checked.

Yeah I'm using zip ties (at least they're black and stealthy) on my vacuum lines

 

[Meydron]

Yea, i have a boost gauge but i think it may be bad, thats why i was wondering what your profec b reads as vacuum if you have one.