Destructive099

Heres the setup -

350 .040 over thus giving a 357
AFR 195cc heads 68cc combustion giving 9.5 ratio 2.02 int flowing 260cfm at .500 1.6 exh flowing 190cfm at .500 lift and my springs are limited to .550lift
Hooker 2055 Headers along with 3" exhaust
TPI setup stock at moment however will adjust this to match afr 195cc head flow numbers or as close as possible.
Vortec V1 Supercharger will be running low psi around 6-8

Got my cam now and just about done with my setup now im looking at spark plugs and wondering whats best for superchargers ? Got a fuel pressure regulator and im wonding what fuel injectors are best for my setup and easy to tune with the computer or new chip.

junkcltr

iTrader: (1)

You are going to max out the MAF sensor if it is still a 1987 TPI ECM setup. You will need to do a fair amount of tuning to compensate for that.

At a minimum I would go with 42#/hr injectors. Since the TPI will limit your RPMs then I think you would probably get away with them. Using a better matched intake for the cam and heads will require the use of the fuel pressure regulator. 55#/hr - 65#/hr would be preferred. It all depends on if you would like to increase the boost later on and do not want to buy injectors again for increased boost.

Cheapest route is Ford 42#/hr green tops. You can always gain a bit more with the fuel press. reg. that you already have. Best route is 55#/hr or 65#/hr.
You will need a custom chip of some sort. Either mail order or DIY. This is not an expert opinion just a regular one.

Destructive099

Might sound stupid but im alittle new on injectors, now i know stock are 19lbs and most with modified cars run around 24-26lbs now by adding a supercharger you mean I go as high as 55-60 lbs ? wont this flood my engine when im breaking it in while not using a supercharger ?

ttypecamaro

iTrader: (2)

If its tuned properly, those big injectors don't seem to be a problem for most. Tuning is the key though. I don't worry so much about making power as I do the tunability of a setup anymore.

Destructive099

Now by using this fuel injector sizing formula for a supercharged engine

500 HP Supercharged engine - Number of injectors = 8
Injector size = (500 HP) x (0.56 BSFC) / (8 injectors) x (0.9) = 31.5 lb./hr

me being around 500 hp its saying i need around 30-36lb/hr injectors any objection to this or error id be making ?

Gilbert Chevrolet - Performance Parts Catalog <--- Injector sizing charts i used

I also see they got high impediance and low which is better for my application I cant seem to find any info on which is better just low is used for racing

ttypecamaro

iTrader: (2)

Low impedence injectors require modifications/parts to be used with your stock ecu. Stay with high impedence injectors.

how do you know 500hp? Using those charts properly would give you 42pph injectors for 500hp. supercharged engines have BSFC around .55-.6. Those hp numbers are for 100% injector duty cycle, meaning ABSOLUTE maximum fueling. you need to allow for some room over top, just in case.

edited for spelling

junkcltr

iTrader: (1)

Your math is incorrect, should have come out to 39#/hr

With the AFR heads, a decent 224 to 232 cam, and decent intake you are going to be in the 450+ HP range. Boosting it at 6-8 PSI will put you over 500 HP. You need injectors for that. Use a BSFC of .60, and an injector duty cycle of .8 to be safe. You don't want to buy injectors twice if you can help it.

A stock TPI ECM will only work with saturated injectors if no additional hardware is used.

A stock Syclone 749 ECM will work with saturated injectors or with peak & hold if two resistors are added to the ECM. It also requires a few harness wires to be re-pinned at the ECM connector and a very custom tuned chip.

Yes, you are going to need to do a fair amount of tuning. That would be needed with or without the 6-8 PSI. The engine you have described if far from stock. Without the boost you would have needed 30#/hr or 36#/hr injectors.

Destructive099

Ok guess im going with 42 lbs/hr svo injectors ive checked summit and ive talked to others and ive been told ford did away or is in the process of doing away with the svo name now im assuming these injectors are the right ones everybody is talking about.

Ford Racing High Flow Fuel Injectors: FMS-M-9593-F302 - summitracing.com

Destructive099

?

Jekyll & Hyde

Correct, the SVO name is gone, but they are still the same.