Has anyone ever tried to change the fuel controller from the MC Xpress from the mega-tune to a PC111 or RB3 controller and if so have you had any success. I am considering putting my PC111 on so I can control my fuel and also my timing, I have had good success on my MPI S/C Apex running low boost ( 6-12#'s) with stock compression but I wonder if the stock injectors will be up to the task when running 12-18 #'s on a decompressed motor. Any thoughts?
MC Xpress fuel controller for Apex
- Thread starter stone
- Start date
You will never be able to "change" the fuel controller, as PCIII/V and RB3 adjust the oem injectors and MCX have their own injectors in IC plenum.
What you can do is disconnect MCX fuel controller and add fuel with PCIII/V or RB3 instead, why you would want to do that i don't know.
Or you can do as i have done, let the MCX fuel controller be and finetune fuelmap and ignition with RB3 (or PCIII).
I believe OEM injectors are good to ~14psi @ sealevel.
What you can do is disconnect MCX fuel controller and add fuel with PCIII/V or RB3 instead, why you would want to do that i don't know.
Or you can do as i have done, let the MCX fuel controller be and finetune fuelmap and ignition with RB3 (or PCIII).
I believe OEM injectors are good to ~14psi @ sealevel.
That's basically what I was getting at was disconnecting the mcx fuel controller and injectors and going with the PC111. I really don't want to piggy back to many controllers on 1 system just use 1 system for all control.
P
powderlites
Well-known member
Too early to say, but High Altitude Boost is working with MCX and getting my MPI, Stage II, SCApex dialed with their "MCX" fuel controller.
I live in CO and park at 10k. No luck with fuel controllers for my elevation. I rode HA Boost's MCX Nytro for a month this season while he was outa town. His sled was turn key the whole month, and never had any bad AFR's or hickups. So nice to not mess with a sled I bought it.
He's 100% the MCX fuel controller will make my Apex work the same. Either way I have a boosted back-up....lol
I live in CO and park at 10k. No luck with fuel controllers for my elevation. I rode HA Boost's MCX Nytro for a month this season while he was outa town. His sled was turn key the whole month, and never had any bad AFR's or hickups. So nice to not mess with a sled I bought it.
He's 100% the MCX fuel controller will make my Apex work the same. Either way I have a boosted back-up....lol
I agree with robrstopr, unless your having issues with the mcx fuel controller, why change it. they flat out work and no dicking around with.
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