Fuel injector size recommendations
Thread Starter
Burning Brakes
Joined: Aug 2004
Posts: 1,110
Likes: 1
From: Geneseo Illinois
St. Jude Donor '06
Fuel injector size recommendations
As some of you may know from another thread im setting up a PowerDyne BD12 sc with a Tempo Designs kit. Engine is 383. Heads are AFR 195 75cc. Expected compression should be about 8.5. Intake will be the LT1 conversion.
I currently have 24lb injectors. Expected boost is only going to be 6--9 lbs.
So any thoughts on a proper size?
I currently have 24lb injectors. Expected boost is only going to be 6--9 lbs.
So any thoughts on a proper size?
Instructor
Joined: Dec 2005
Posts: 188
Likes: 0
From: Riverside CA
I have a simular set up. i Use a TPI which runs at a lower RPM but I am running 12# of boost. I use 44# inj and they are maxed out. my 255 fuel pump would not keep up either and I saw D-Cycles 105%
Running a booster double pump now.
If I were you, I would get 42#+ maybe go to some 50's so you have a little room.
Running a booster double pump now.
If I were you, I would get 42#+ maybe go to some 50's so you have a little room.
Drifting
Joined: Dec 2001
Posts: 1,313
Likes: 1
From: providence ut
How many CFM is this supercharger going to flow?..........I run a p600b procharger flowing 1200 cfm at 60,000 rpm..........this on my 383 gives me about 10 psi.............I'm thinking your only going to see 4 to 5 psi........I have two brothers running powerdyne"s but there running them on motorcycle engine dunebuggies.........you can't over spin those babys or they will burn the internal belt..........now I,m not a powerdyne expert..........don't know the differrant models but they spin slow and the cfm is low.......what is your cfm?..........I run 36's with a FMU
Thread Starter
Burning Brakes
Joined: Aug 2004
Posts: 1,110
Likes: 1
From: Geneseo Illinois
St. Jude Donor '06
mine is a BD-12. from what i can gather it should do 800 cfm at 9 psi. i expect 6 or 7 psi on this 2.93 pulley...from another thread max is about engine 5500 rpms with about 40k rotations.
this is my first experiment w/ sc. so i appreciate the help.
i m hoping that i can get this programmed with my DFI gen vii on a dyno, meth/water injection, afpr, and 36-42 lb injectors and walbro 255 and avoid a FMU etc. just want a simple, fun, easy install that adds about 75-100 hp. quiet, too... later on i can sell the kit on ebay and move on to what i really want and can not afford: an ATI Procharger! but i want to test the waters first.
this is my first experiment w/ sc. so i appreciate the help.
i m hoping that i can get this programmed with my DFI gen vii on a dyno, meth/water injection, afpr, and 36-42 lb injectors and walbro 255 and avoid a FMU etc. just want a simple, fun, easy install that adds about 75-100 hp. quiet, too... later on i can sell the kit on ebay and move on to what i really want and can not afford: an ATI Procharger! but i want to test the waters first.
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Did you see the site I referenced in this thread?
http://forums.corvetteforum.com/show....php?t=1804300
http://forums.corvetteforum.com/show....php?t=1804300
Pro
Joined: Oct 2004
Posts: 745
Likes: 0
From: New Hyde Park Long Island New York
here is my set up with 42lbs.
1994 CORVETTE
CONVERTIBLE
COMPETITION YELLOW (1 OF 834)
BLACK LEATHER INTERIOR
BLACK TOP
DRIVETRAIN:
ORIGINAL MOTOR STROKED TO 383 CU.IN
FORGED ROTATING ASSEMBLY WITH 9 ½ COMPRESSION
COMP CAM BLOWER ROLLERCAM CRANE 1.6 ROLLER ROCKERS
PORT POLISHISHED AND BENCHED FLOW HEADS MANLEY VALVES
Lt-4 INTAKE MANIFOLD PORT MATCHED AND POLISHED
BBK 58 MM THROTTLEBODY
VORTECH S TRIM SUPERCHARGER POLISHED
UPGRADED PULLEY MODIFIED AIR VALUTE
GASEOUS “ALKY” INTERCOOLING
DUAL WALBRO FUEL SYSTEM INTANK AND INLINE
42 LBS HIGH FLOW FUEL INJECTORS
CRANE IGNITION W/ TIMING BOOST CONTROLLER
MSD IGNITION COIL MSD 8. 5 MM WIRES
AUTOMETER BOOST AND FUEL PRESSURE GAUGES
MANUAL FAN CONTROLER
TPIS LONG TUBE HEADERS 1 ¾ HEAT COATED
3 INCH EXHAUST X PIPE MAGNAFLOW MUFFLERS
LEVEL 10 PTS 4L60E TRANSMISSION 2800 STALL CONVERTOR
DANA 44 UPGRADED REAR W/ 354 GEARS
HEAVYDUTY REAR SPRING BILSTEIN SHOCKS
EXTENSIVE DYNO TUNING 496 RWHP 540 TORQUE ( CONSERVATIVE #’S)
1994 CORVETTE
CONVERTIBLE
COMPETITION YELLOW (1 OF 834)
BLACK LEATHER INTERIOR
BLACK TOP
DRIVETRAIN:
ORIGINAL MOTOR STROKED TO 383 CU.IN
FORGED ROTATING ASSEMBLY WITH 9 ½ COMPRESSION
COMP CAM BLOWER ROLLERCAM CRANE 1.6 ROLLER ROCKERS
PORT POLISHISHED AND BENCHED FLOW HEADS MANLEY VALVES
Lt-4 INTAKE MANIFOLD PORT MATCHED AND POLISHED
BBK 58 MM THROTTLEBODY
VORTECH S TRIM SUPERCHARGER POLISHED
UPGRADED PULLEY MODIFIED AIR VALUTE
GASEOUS “ALKY” INTERCOOLING
DUAL WALBRO FUEL SYSTEM INTANK AND INLINE
42 LBS HIGH FLOW FUEL INJECTORS
CRANE IGNITION W/ TIMING BOOST CONTROLLER
MSD IGNITION COIL MSD 8. 5 MM WIRES
AUTOMETER BOOST AND FUEL PRESSURE GAUGES
MANUAL FAN CONTROLER
TPIS LONG TUBE HEADERS 1 ¾ HEAT COATED
3 INCH EXHAUST X PIPE MAGNAFLOW MUFFLERS
LEVEL 10 PTS 4L60E TRANSMISSION 2800 STALL CONVERTOR
DANA 44 UPGRADED REAR W/ 354 GEARS
HEAVYDUTY REAR SPRING BILSTEIN SHOCKS
EXTENSIVE DYNO TUNING 496 RWHP 540 TORQUE ( CONSERVATIVE #’S)
