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Supercharged Xj running lean

bassxj

NAXJA Forum User
Location
Columbus,GA
hi just put a m90 on my xj so far i need to fix a boost leak but getting about 2psi but after leak is fixed should be 5psi.... well i believe i am running lean it was being hesitent when i gave it some gas.. what would be some ways to increase fuel???.. i have 30lb injectors in and i dont really want to spend money on a piggyback computer... i have a vortec FMU but i dont have a return line on my 01 xj
 
You obviously need to do more research before you blow something up.

You don't want to spend money on a piggyback, but you're spending money on a supercharger so why not? I really don't understand.

How do you know your running lean? Hesitation isn't necessarily a lean condition.

Do you have a wideban O2?
 
The definition of dumb is building a supercharged rig and not having a WEGO.
 
As other have said, 30s are too large and you need a Wego to start with. No such thing as a cheap supercharger. You might also need at least a piggy back or tune, but you first need to see where your air fuel ratio is first.
 
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