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Discussion Starter · #1 ·
...be used with the Allen supercharger on a 96 4.6 bird? I'm asking only because I have an opportunity to get a set of 42s cheap right now. They're probably excessive since I'm sticking with my stock heads and rotary assembly. Could Dennis Reinhardt program his chip so the 42s work fine? :confused:
If there's any webpages talking about injector choice for Allen/4.6 engines I'd like to read them.
 

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Sheepish
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You also might want to upgrade your fuel pump as a precaution if you're going to 42lb injectors. Just a thought.
 

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AED Specialist
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1,283 Posts
Yes...

Michael96Sport,

Yes it will work provided the changes are made to the computer. Cold start up will be very difficult otherwise. 42's may be overkill for your set-up though.

Make sure you have enough fuel pump for those puppies. I agree with Joe.

Figure out how much air flow you'll be moving through the MAF and what A/F ratio you would like and from that you can figure out what size injector you will need. For example, let's say my car flows 45 lb./min of air at the L-MAF. I'm running a 11.8:1 A/F ratio at WOT. That means I need an injector that flows 28.6 lb./hr. at WOT to sustain the 11.8:1 A/F ratio. 30's would be at 95% duty cycle. Of course fuel pressure plays in here as well, but you get the idea. For your car (not knowing the mods) let's say you flow 38-40 lb./min at WOT. You install those 42's# injectors and your A/F ratio is 12.0:1 at WOT. You need a 24 lb./hr. injector to sustain the 12.0:1 A/F ratio at WOT. So your 42's are at 58% duty cycle when you go WOT. This is just food for thought. My opinion is to run 30's with stock heads. Even with the smaller blower pulley you'll still be ok. If you plan on SVO or PI heads, you will need 36's at the minimum as 30's will just cut it.

J-Rob,

The stock pulley AED kit runs 19 lb./hr. injectors with their fmu and a 190 lph fuel pump. The swap to a smaller pulley requires a fuel system change in the order of 30 lb./hr. injectors, a L-MAF (or a Pro-M) and a chip or reflashed EEC-V. Then you eliminate the fmu on the AED kit and run it like it is supposed to be run.

A-Train
 
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