I've Got A Dyno To-do List

Discussion in 'Fox 5.0 Mustang Tech' started by 90GTFIVO, Oct 19, 2012.


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  1. 90GTFIVO

    90GTFIVO Member

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    I have a supercharged 5.0 and have finally found what seems to be a very reputable Foxbody dyno/tune shop in Columbus, OH. Talked to the owner today and gave him my list of mods on my 90GT. He recommended I make some changes/upgrades before I bring the car in. As a few on here already hit on, I need to beef up my fuel pump from 190 Lph to 255 Lph and my 24# injectors to 42# or 60# (if price is comparable). This will allow me to do away with the FMU.

    I'm new to all this and a couple things. He mentioned something about 40# based pressure. No idea what this means, can anyone help?

    Few other things I picked up on from reading about the V3 SCi:

    I currently have a 75mm mass air meter. If I up the injector size, do I need to have the mass air re-calibrated?

    How important is it to upgrade my ignition system?

    I read where it would be wise to change plugs to 1 heat range colder than stock. I'll probably go ahead and do this since it will be fairly inexpensive.

    If you have any suggestions on what injectors to buy and best place to buy them (cost), let me know. Thanks!
     
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  2. Bullitt347

    Bullitt347 man bewbs please...

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    The 40 psi base fuel pressure is the starting point. Without an FMU the fuel pressure regulator will typically (if stock) raise fuel pressure by 1 psi for every pound of boost. With the 42 lb/hr (or 60 lb hr) injector set at 40 psi base (engine idling vacuum/boost hose off) fuel pressure, then at 10 psi of boost the fuel injector will see 50 psi and add enough fuel to keep the engine happy. Of course the dyno will be the best place to change the fuel pressure to allow for optimal air/fuel readings at WOT/max boost. And naturally the MAF will have to be calibrated for the larger fuel injector, either thru a different sample tube (like a C$L meter) or thru the ECU map for the MAF.
     
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  3. pearlnotchback

    pearlnotchback Active Member

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    can you run 42lb injectors with an FMU?
     
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  4. 90GTFIVO

    90GTFIVO Member

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    I will not use the FMU when I upgrade injectors.
     
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  5. Noobz347

    Noobz347 Stangnet Facilities Maint Tech... Er... Janitor Admin Dude

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    Duplicate thread in Tech.

    Closed :lock:
     
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