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Help with fuel injector size for turbo rb #1155578 01/12/12 11:15 PM 01/12/12 11:15 PM
Joined: Dec 2004 Posts: 750 davenport iowa P paul69cuda OP super stock
paul69cuda OP super stock P Joined: Dec 2004 Posts: 750 davenport iowa	Here is the setup 440 30 over stock stroke 9-1 comp out of the box eddy 88cc. Small hyd roller. F.A.S.T efi with a eddy pro-flo xt manifold with 90 m throttle body. Borgwarner s400 80 mil turbo with a 1.32 ar .I want to run 91 pump gas I saw a guy at Columbus with 451 B motor who had pro charger running 15 Lbs of boost on the street with 100 lbs injectors. This is a street strip car I'm building with a stock block with aluminum caps and girdle. Anyone have any advice I'm looking at 85-95 lbs inj some real world experience Would be great.

Re: Help with fuel injector size for turbo rb [Re: paul69cuda] #1155579 01/12/12 11:43 PM 01/12/12 11:43 PM
Joined: Aug 2003 Posts: 43,228 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,228 Bend,OR USA	Call F.A.S.T. and ask them, I'm under the impression that you want the injectors to be operating at or above 85% duty cycle at WOT in the upper RPM Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Help with fuel injector size for turbo rb [Re: Cab_Burge] #1155580 01/13/12 09:35 AM 01/13/12 09:35 AM
Joined: Jan 2003 Posts: 4,244 Canada Kam*Kuda master
Kam*Kuda master Joined: Jan 2003 Posts: 4,244 Canada	http://www.gtsparkplugs.com/InjectorSizeCalc.html I use 83 lb injectors 500 inch. It is on a N/A engine but injectors were sized for a D1 Procharger setup. (est 850 hp) 1970 Barracuda Convertible 1968 Satellite Street Strip car 1654.5 Mustang 1955 Land Rover

Re: Help with fuel injector size for turbo rb [Re: Kam*Kuda] #1155581 01/13/12 07:28 PM 01/13/12 07:28 PM
Joined: Jan 2003 Posts: 5,762 Hot Rod Ridge FastmOp master
FastmOp master Joined: Jan 2003 Posts: 5,762 Hot Rod Ridge	How many HP you wanting to make? I run 72# injectors in my junk.

Re: Help with fuel injector size for turbo rb [Re: paul69cuda] #1155582 01/13/12 09:19 PM 01/13/12 09:19 PM
Joined: Dec 2004 Posts: 750 davenport iowa P paul69cuda OP super stock
paul69cuda OP super stock P Joined: Dec 2004 Posts: 750 davenport iowa	Well max hp is 1000 for the turbo so I'm told. I would love to make 800 on pump gas

Re: Help with fuel injector size for turbo rb [Re: paul69cuda] #1155583 01/13/12 09:55 PM 01/13/12 09:55 PM
Joined: Aug 2005 Posts: 760 Southington Ct. T turbobitt super stock
turbobitt super stock T Joined: Aug 2005 Posts: 760 Southington Ct.	Quote: Here is the setup 440 30 over stock stroke 9-1 comp out of the box eddy 88cc. Small hyd roller. F.A.S.T efi with a eddy pro-flo xt manifold with 90 m throttle body. Borgwarner s400 80 mil turbo with a 1.32 ar .I want to run 91 pump gas I saw a guy at Columbus with 451 B motor who had pro charger running 15 Lbs of boost on the street with 100 lbs injectors. This is a street strip car I'm building with a stock block with aluminum caps and girdle. Anyone have any advice I'm looking at 85-95 lbs inj some real world experience Would be great. 83 lb/hr should do it but would be the lowest I would go. 96 lb/hr would give you some room to grow. Don't worry about going to big if its a sequential box. FYI - I'm running 160 lb/hr but have 2 less cylinders and can still idle fine. 1970 Challenger w/572 Hemi street car and my pride and joy. 1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno. 1976 Cee Bee Avenger Jet Boat - 460 Ford powered.

Re: Help with fuel injector size for turbo rb [Re: paul69cuda] #1155584 01/14/12 01:36 PM 01/14/12 01:36 PM
Joined: Dec 2004 Posts: 750 davenport iowa P paul69cuda OP super stock
paul69cuda OP super stock P Joined: Dec 2004 Posts: 750 davenport iowa	Good feedback keep it coming.

Re: Help with fuel injector size for turbo rb [Re: Cab_Burge] #1155585 01/14/12 02:06 PM 01/14/12 02:06 PM
Joined: Aug 2005 Posts: 760 Southington Ct. T turbobitt super stock
turbobitt super stock T Joined: Aug 2005 Posts: 760 Southington Ct.	Quote: Call F.A.S.T. and ask them, I'm under the impression that you want the injectors to be operating at or above 85% duty cycle at WOT in the upper RPM Typically want to keep the duty cycle below 85%. Never want to be near 100% Allan G. 1970 Challenger w/572 Hemi street car and my pride and joy. 1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno. 1976 Cee Bee Avenger Jet Boat - 460 Ford powered.

Re: Help with fuel injector size for turbo rb [Re: turbobitt] #1155586 01/15/12 01:13 PM 01/15/12 01:13 PM
Joined: Dec 2004 Posts: 750 davenport iowa P paul69cuda OP super stock
paul69cuda OP super stock P Joined: Dec 2004 Posts: 750 davenport iowa	2 things I was told high imp on injectors makes it easy to idle vs low imp? And 80 lbs inj for say a ls motor will flow 86 due to higher fuel pressure? Is this correct!

Re: Help with fuel injector size for turbo rb [Re: paul69cuda] #1155587 01/15/12 01:32 PM 01/15/12 01:32 PM
Joined: Aug 2005 Posts: 760 Southington Ct. T turbobitt super stock
turbobitt super stock T Joined: Aug 2005 Posts: 760 Southington Ct.	Quote: 2 things I was told high imp on injectors makes it easy to idle vs low imp? And 80 lbs inj for say a ls motor will flow 86 due to higher fuel pressure? Is this correct! There has been a lot of argument over low vs. high impedance injectors but for injector sizes in the range the OP is looking for it wouldn't be a factor. Any fuel injector will flow more at higher base pressures. Some will react better than others at these elevated pressures. For comparison, the flow ratings are uasully given at the same pressures. With aftermarket fuel managment, there is rarely any reason to play with the recomended base pressure. For boosted applications, you would be using a fuel regulator with a pressure sensing port. This will keep the pressure differential the same under boost pressures. Example, if the base pressure is 45 PSI, then apply 20 PSI boost, the regulator will increase the pressure to 65 PSI to keep the pressure differencial and flow rating the same(85FuelPSI - 20 PSIBooost = 45BasePSI). Last edited by turbobitt; 01/15/12 01:35 PM.

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