Hello I am wondering if anyone has the experience with superchargers and getting the basic tuning down. Like what fuel pressure, spark plug gaping, TPS voltage, timing, air fuel ratio and other factors regarding engine performance should be around. I have a SCT chip and was told that my fuel mods and bolt ons need to be reconsidered and upgraded before proceeding with a $400 tune. My stang ran decent last year with a stock maf , fmu, 195lph fuel pump and 19# injectors along with a powerdyne. My build is a powerdyne bd-11a making ~8 psi with a 76mm MAF, 30# injectors, bbk adjustable fuel pressure regulator, fmu, 195lph warblo fuel pump, 8LG ECU, stock block heads and cam, 75mm TB, and a MSD coil. I know I should get a dyno tune but I am confident in the build and know I can squeeze more power out of it with out forking out more cash. Any suggestions would be greatly appreciated!

 

The biggest problem is getting the correct fuel ratio. Tuning a fox is more like tricking the PCM than actually tuning it. Bigger MAF allows more air so of course you need bigger injectors and more fuel pressure to make the PCM believe it's still stock and control correctly. I would probably go with a little bigger pump and injectors then get it dyno tuned. Not really sure how A/F is determined on the old system since the PCM responds very slowly but I'm sure a good tuner will have a way. With the blower, I would make sure I have more than enough fuel supply and just get her tuned. If you are going to get a dyno tune anyways which I recommend, just make sure you have all the parts on the car that you need already.

 

Als so your saying that my Maf and injector combo isn't enough for what I currently have? I'm looking to see if there's anything I can do my self just so the engine performance is more reliable and efficient.

 

I'm not sure. I'm sure the MAF is good enough. With a blower I'm thinking even the stock may be better since it will read true air flow in more accurately. I don't remember if the #19 injectors are enough. Pump may be a little small, just depends if your fuel pressure drops off any. I would probably swap over to the oem MAF till you get it tuned.
You're running a very slow reacting system on those cars. So blower cars will pretty much have to be manually set up.(fuel pressure, injectors, timing, etc.)

 

I would have gone with 42lb injectors & 255 fuel pump…. Your limiting your setup to mid 300's with 30lb injectors.

I copied this from the internet but its the Formula you can get yourself out of the Ford Racing parts Catalogue.

Injector Rating x # of injectors x Injector Duty Cycle / Brake Specific Fuel Consumption = Maximum Horsepower

30 x 8 x .9 / .5 = 432 (naturally aspirated)
30 x 8 x .9 / .6 = 360 (supercharged)

I'd set timing to stock, fuel pressure to stock, TPS Volate to .99-.999, get a colder plug gapped to i'd say .32-.33, and then GET IT TUNED! I've never messed with an FMU so maybe I'm wrong but your currently not getting the full potential out of that setup what so ever.

 

I see what your saying and I read up a bit on a ford article on fuel delivery, efi and ignition systems and agree. If I get a SCT Big Air 90MM mass I can use it for 42lbs and also for larger injectors after it is re calibrated is this correct? As for injectors would 60lbs be too much? I am regretting my decision of installing the 30 pounders and wanna make sure I get the good stuff so I don't have to keep wasting my time and money. I see what people mean when they say this race stuff can really wipe out your bank account.

 

Or is it possible to get my bbk 76mm MAF and re calibrate it to work with a 42# injector setup?

 

Yes, if you purchased a 90mm Mass air for 42's you could get it recalibrated down the road. For your current setup 60's would be overkill, I'm sure a competent tuner would get it to work but I feel 42lbers are your best bet.

Unfortunately you've gotta pay to play! Although in my experience injectors resell pretty quickly on a forum. I had no problem getting rid of 24's & 42's years ago at least.

http://www.promracing.com/meter-reca...er-brands.html

Pro M Racing will recalibrated the BBK for 150$... Again, you may be able to sell the BBK along with the injectors for close to what you paid. Then pick up an SCT 90.

76mm=2.99 inches in diameter 90mm=3.5 inches... I'd measure the inside diameter of the piping behind the mass air. If it's bigger than 76mm then I'd let that make my choice on what Mass Air to run.