I need help figuring out my fuel system. I have no idea what power I can expect out of the combo, so it makes it hard to figure out what I need.
I have a P1SC going to be sent in and turned into a D1. I have a 4" thick FMIC and I am probably going to have ~15lbs of boost to start. I have TFS 64cc heads I am sending to Lloyd for porting, upgraded springs and valves. Intake is also going to him to be ported and a custom grind cam from Lloyd as well. Forged Scat 383 w/ EFI connection 24x conversion. 58mm Trick Flow throttle body, Long tubes, no cats, x-pipe and true duals.
I have 42lb injectors I was going to use until I changed plans to go FI. Without having a ballpark HP guess, I dont know what size injectors I need.

1. Single 255lph with a booster pump or twin in tank 255's??
2. Do I need a boost referenced fuel pressure regulator? 1:1?? I wont be using a FMU.
3. What size injectors? With maybe a little room to grow for more boost?
4. What would be an ideal compression ratio?
5. What pulleys do I need to achieve ~15lbs of boost.

I got a killer deal on the Procharger kit, so I have to replan the build. Any advice/opinions, HP guesses, etc... would be greatly appreciated. Income tax time is here so I need to know what I need to proceed. Thanks guys!

 

I have a pretty similar build aside from some of the finer details. Here is my input below based on my research.

1. Single 255lph with a booster pump or twin in tank 255's??

15lbs of boost should throw down some serious power. I would recommend twin pumps in the tank. Look up Lonnie's double pumper setup. The guy knows his stuffs and builds really nice systems.

2. Do I need a boost referenced fuel pressure regulator? 1:1?? I wont be using a FMU.

I recommend a aeromotive FPR. It is a 1:1 regulator and has a nice port for a fuel pressure gauge.

3. What size injectors? With maybe a little room to grow for more boost?

I went with 80lb high impedance injectors to handle around 15lbs on a F1A head unit. 60lb should be a minimum for your boost level.

4. What would be an ideal compression ratio?

I would think ~9:1 will be fine. Mine is right around 9.2:1 SCR.

5. What pulleys do I need to achieve ~15lbs of boost

Procharger can spec you the proper pullies to achieve 15lbs. This will be dependant on the head unit, rpm, heads, cam, etc etc on what boost you will actually see. If I had to guess a power level, I would guess 650rwhp give or take.

 

Thanks! Thats exactly the info I was looking for!

 

Little off topic, but may I ask what ATI is charging for the P1SC to D1 conversion?

 

I havent called yet, but I have heard ~$800 for a rebuild and D1 conversion. I could be wrong though.

 

Thanks

 

go duel intank pumps. and i run a hobbs switch to turn on the 2nd pump, i did my own kit, it was very easy.

 

I found some new Siemens Deka 80lb EV1 High Impedance Fuel Injector for $380. Would these be good or overkill? How importantant is flow matched injectors?

 

I wouldn't obsess over your 'lbs of boost' number. Do your build with a HP number or 1/4 time number in mind- not a boost number.

You could easily attain 15 lbs of boost with a P600 on a stock motor with a small cam and heads- it wouldn't last long but would be possible. Worry more about making your build work together than your boost number.

For the coin you are spending don't cheap out on injectors- and def get flow matched- you want to insure each cylinder is getting the same amount of fuel. One could be heavy rich, the other could be lean but you would have no idea since they would cancel each other out.

 

Trick flow heads out of the box, 383, 9.5:1 compression pullied D1sc for max rpm. Made 15 PSI with no filter, 700 rwhp 640 rwtq at 6500 rpm

BMR Tank, Aeromotive eliminator pump, -12 to pump to -10 feed to y block, boost reference 1:1 FP regulator, to -8 lines to the rail with an -8 return 85# injectors 58% duty cycle on the injectors

Steve

 

App... 97ss 383 D1 MM6 trans. Spearco intercooled. AFR 190 heads. Moser 12/ 3.73:1 ratio. CamMotion blower grind 231/240_.538/.585 114lsa.

Use two (2) 255lph Walbro intank pumps.
Run Aeromotive boost-ref reg (remote local - not on rail).
72#/hr Seimens peak-hold inj. with LJ's driver.
Static comp @ 9.5:1. (54cc head chamber, -28cc JE piston, Fel_Pro 1074).
Pulley ref @ 7.625" PD driven/ 3.4" PD @ ProCharger head.

 

I ordered twin walbro gss340's. I found out that a D1 upgrade is $1540 plus shipping from procharger. So I am probably going to run the P1sc until I can find another D1SC head unit. I can probably find a D1SC head unit for the price of the upgrade. Also the $1540 is ONLY the upgrade and does not included anything else other than the upgraded impeller - any seals, bearings etc.. that they find issues with is extra.

So running the P1SC , i guess I can expect maybe 9-12 lbs on the 383. Would 72 or 80 lb injectors still work ok, or do I need less. I just want to buy one set so when I do get a D1sc I dont need to buy another set of injectors later on. Thoughts, advise, opinions? Thanks for the input so far.

Also the TFS heads I have I believe are TFS-30400010. They have 62cc combustion chambers. Are you saying to mill them down and use a larger dish piston? With the 62cc chambers, what dish size would get me the desired static CR? Thanks!

 

The D1 head has a 4.44:1 ratio. The F series has a 5.4:1 set-up ratio. The P1 series is around 3.3:1. ProCharger has all the specs. The higher ratio head units have a faster impeller acceleration rate. Spins up faster to achieve full boost pressure/ flow.

70 or 72#/hr injectors would probably be enough for these blowers. I like the peak/ hold injectors. Requires a driver w/ use of the stock LT1 PCM.
B.