42 Or 60lbs Injectors
Thread Starter
Joined: Dec 2004
Posts: 699
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From: Redondo Beach, California
42 Or 60lbs Injectors For A Phamspeed Turbo Ls1 With Ported Heads And Cam And A Goal Of About 600rwhp What Is Best Injector Size 42 Or 60's? What Changes Needs To Be Done To The Fuel Sytem For 60lb'ers.?
42's will be at the edge so id use the 60's.
to swap out injectors your going to need some computer programming ofcoarse.
also you need a pump that can support it to.
the stock lines should be alright, but if you go up further then that id upgrade.
to swap out injectors your going to need some computer programming ofcoarse.
also you need a pump that can support it to.
the stock lines should be alright, but if you go up further then that id upgrade.
Launching!
Joined: Nov 2004
Posts: 243
Likes: 0
Originally Posted by SELLSZ06
For A Phamspeed Turbo Ls1 With Ported Heads And Cam And A Goal Of About 600rwhp What Is Best Injector Size 42 Or 60's? What Changes Needs To Be Done To The Fuel Sytem For 60lb'ers.?
I personally am at about the same power level as you, and upgraded from 50's to 60's and I wish I went larger...better to big then to small IMO.
Originally Posted by smokinHawk
42's will be at the edge so id use the 60's.
to swap out injectors your going to need some computer programming ofcoarse.
also you need a pump that can support it to.
the stock lines should be alright, but if you go up further then that id upgrade.
to swap out injectors your going to need some computer programming ofcoarse.
also you need a pump that can support it to.
the stock lines should be alright, but if you go up further then that id upgrade.
*not trying to steal the thread, but it is related info
From the Turbo FAQ
How do I select fuel injectors for a forced induction application?
First you need to figure out what BSFC (Brake Specific Fuel Consumption) value you will use, BSFC is the pounds of fuel the engine burns per HP per hour.
Here are some BSFC guidelines.
.45 for N/A motors
.55 for supercharged
.65 for turbo
Injector Size in LB/HR = ((Desired Flywheel HP) * BSFC) / (# of cyls * Duty Cycle % / 100)
These simplified versions can be used for V8 motors with 80% duty cycle
Turbos : LB/HR = (Desired HP * .65) / 6.4
Superchargers : LB/HR = (Desired HP * .55) / 6.4
Example
600 * .65 / 8 * .80
Gives me
390 / 6.4
Result : 60LB/HR
How do I select fuel injectors for a forced induction application?
First you need to figure out what BSFC (Brake Specific Fuel Consumption) value you will use, BSFC is the pounds of fuel the engine burns per HP per hour.
Here are some BSFC guidelines.
.45 for N/A motors
.55 for supercharged
.65 for turbo
Injector Size in LB/HR = ((Desired Flywheel HP) * BSFC) / (# of cyls * Duty Cycle % / 100)
These simplified versions can be used for V8 motors with 80% duty cycle
Turbos : LB/HR = (Desired HP * .65) / 6.4
Superchargers : LB/HR = (Desired HP * .55) / 6.4
Example
600 * .65 / 8 * .80
Gives me
390 / 6.4
Result : 60LB/HR
Code:
Supercharged HP LB/HR 300 25 350 30 400 34 450 38 500 42 550 47 600 51 650 55 700 60 750 64 800 68 850 73 900 77 950 81 1000 85 1050 90 1100 94 1150 98 1200 103
Code:
Turbo HP LB/HR 300 30 350 35 400 40 450 45 500 50 550 55 600 60 650 66 700 71 750 76 800 81 850 86 900 91 950 96 1000 101 1050 106 1100 111 1150 116 1200 121
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Originally Posted by KissMySSo1
Those #'s are way off.
They are supposed to be at the flywheel
If you have a better formula for finding that data then let me know.
MelloTellow.. You're right.. I was looking at the figures and they seemed a little low, IE a lot of injector to hit a certain FWHP level.. I am running 50lb Holley injectors, and I'm pushing about 700RWHP and my injectors have not hit 100% duty cycle as yet. However I am pushing about 70psi of fuel pressure with my dual 340m's intank pumps, and my new aeromotive fuel controler for my 2nd pump.. But at my power levels and 50 lb injectors I can't go much farther..
Clint
Clint
I need to start planning my fuel system. I plan on using a weldon pump with controller, and an injector to support 1300 fwhp with the stock computer (crossing fingers). Would it be ok to run a 75lb injector and then use alky or meth when i want to hit 1000 rwhp? Should i run dual intank pumps? Should i run low impedance injectors with an impedance convertor? What would be best for my situation? I obviously don't want to have a 1000 hp car all the time so what do you guys think? I plan to do a sumped tank, rails, lines, boost referenced FPR, and any other little things that go with the fuel system. How would a high lb per hour injector do when run at an extremely low duty cycle? I don't think i would want to run more than 600 hp on the street.
Greg
Greg
Originally Posted by Boostaholic
Code:
Supercharged HP LB/HR 300 25 350 30 400 34 450 38 500 42 550 47 600 51 650 55 700 60 750 64 800 68 850 73 900 77 950 81 1000 85 1050 90 1100 94 1150 98 1200 103
Code:
Turbo HP LB/HR 300 30 350 35 400 40 450 45 500 50 550 55 600 60 650 66 700 71 750 76 800 81 850 86 900 91 950 96 1000 101 1050 106 1100 111 1150 116 1200 121
Originally Posted by LSs1Power
It should be the other way around. SC usually need more fuel to give the same HP as turbo because they have prastic loss which is not accounted for. So a Turbo car might need 42's to get 550rwhp, but a SC will need 57 or 60lbs injectors.
I agree with you there and those figures were 3 bar fuel pressure 43.5psi and we run a base of 4 bar 58.03psi...... and with a rate rise FP reg. we can puh them farther... look at Mightey Mouse he made over 800rwhp with 60# Motrons... and Meth injection (wich helped) BTW Im selling my motron 60"s... time to go bigger
Kyle
TECH Fanatic
Joined: Nov 2001
Posts: 1,986
Likes: 1
From: Centrifugal City
Agree also that cylinder fuel requirements are higher for SC cars than turbo also. Not sure how cylinder power relates to BSFC. But it takes 75-100 Cyl HP more to drive the blower (and the fuel to make that).
But I think Cyl HP and BSFC are calculated differently.
Bottom line, takes more fuel/inj for SC's.
But I think Cyl HP and BSFC are calculated differently.
Bottom line, takes more fuel/inj for SC's.
Originally Posted by KissMySSo1
60#rs at 60 psi will support 1000fwhp
Originally Posted by LSs1Power
I doubt it... Im running 60lbs injectors with 60-61psi of fuel pressure and seeing around 75% DC at 550rwhp. That is around 650 FWHP and im at 75% Duty Cycle. From what im seeing with the 60lbs i think they are good up to 650rwhp on a SC'd LS1 or 750rwhp on a Turbo running 60psi of FP and over 100% DC.
The only known calculation I've seen for inector size and power is the:
Lbs/hr= HP/16 and then add a little for the SC'rs and with this, those numbers are pretty far off. Correct me if I'm wrong
Lbs/hr= HP/16 and then add a little for the SC'rs and with this, those numbers are pretty far off. Correct me if I'm wrong
Last edited by 01Blackerado; Mar 25, 2005 at 12:46 PM.