injector sizing
Thread Starter
3rd Gear
Joined: Mar 2015
Posts: 3
Likes: 0
injector sizing
Went to get tuned and ran out of fuel. 383 vortech v1 t-trim. 8# boost. 50lb injectors max out 4000rpm and close to 600rwhp. Im think of taking out the bosch 040 pump for dual walbros. Ideas welcome
Instructor
Joined: Feb 2012
Posts: 165
Likes: 13
From: Frisco TX
You should do that and perhaps bump up injectors. I am going to run 80s
Melting Slicks
Joined: Jun 1999
Posts: 2,872
Likes: 3
From: Wilmington NC
I agree with Greg, 044 should be plenty. If its not an 044, I would switch out to the newer walbro e85 450lph racing pump, that will be add much fuel as you'd ever need and simplify having to deal with a twin pump setup and remain in tank.
If you are running an actual Bosch 044, you have issues elsewhere. Maybe clogged filter, bent line, split hose between pump and hat, fuel pressure set too low etc....
Chris
If you are running an actual Bosch 044, you have issues elsewhere. Maybe clogged filter, bent line, split hose between pump and hat, fuel pressure set too low etc....
Chris
Melting Slicks
Joined: Jul 2004
Posts: 3,277
Likes: 32
From: Mission Viejo California
Great power at 8lbs of boost. What's the rest of the combo?
Thread Starter
3rd Gear
Joined: Mar 2015
Posts: 3
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Bosch part number: 0 580 254 040.Minimum current: 12 Volts.Operating pressure: up to 7 Bar.Delivery volume: 102 liter per hour @ 6.5 Bar.Mounts in-tank.Can be used with E85 fuel.Supply voltage 6 - 16.5 V.Operating voltage 13.8 V.Weight: 930 Grams.
Fuel pump connections:
Inlet: open base.Outlet: M12 x 1.5.Electrical: Positive M6 / Negative M5.
Supporting Vendor
Joined: Oct 2004
Posts: 761
Likes: 68
044 almost double your 040. In fact I stopped using them maybe 10 years ago due to - too little flow even as a primer pump !
Switch to the 044. You cut cut up an old sock and ty-wrap to inlet or mount pump outboard behind the license plate and simply put a fuel filter as your in-tank pick up. the 044 will solve your fuel delivery issues.
Switch to the 044. You cut cut up an old sock and ty-wrap to inlet or mount pump outboard behind the license plate and simply put a fuel filter as your in-tank pick up. the 044 will solve your fuel delivery issues.
Last edited by BlowerWorks; Apr 9, 2015 at 01:51 PM.
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Thread Starter
3rd Gear
Joined: Mar 2015
Posts: 3
Likes: 0
044 almost double your 040. In fact I stopped using them maybe 10 years ago due to - too little flow even as a primer pump !
Switch to the 044. You cut cut up an old sock and ty-wrap to inlet or mount pump outboard behind the license plate and simply put a fuel filter as your in-tank pick up. the 044 will solve your fuel delivery issues.
Switch to the 044. You cut cut up an old sock and ty-wrap to inlet or mount pump outboard behind the license plate and simply put a fuel filter as your in-tank pick up. the 044 will solve your fuel delivery issues.
Melting Slicks
Joined: Jul 2004
Posts: 3,277
Likes: 32
From: Mission Viejo California
Here's an interesting comparison. The 044 has almost 50% more flow when you're in boost.
http://radiumauto.com/media/techarticle-page.php?Radium-s-Ultimate-Fuel-Pump-Test-87
Also don't forget to go to a hotwire kit if you don't have one already. The larger pumps pull a lot of amperage.
http://radiumauto.com/media/techarticle-page.php?Radium-s-Ultimate-Fuel-Pump-Test-87
Also don't forget to go to a hotwire kit if you don't have one already. The larger pumps pull a lot of amperage.
Last edited by qwiketz; Apr 10, 2015 at 12:21 AM.
Racer
Joined: Jul 2000
Posts: 290
Likes: 4
From: Jax, FL
I have a t-trim at 8 lbs on an 89 trans am with 383 and miniram intake and i ran out of fuel at 480 rwhp above 5100 rpm. I have a 12 year old walbro 255 with hot wire kit and 80lb injectors.
I have a dual walbro set-up going in the car this weekend and the fuel rails are at TPIS now getting modified with dual inlets and dual outlets.
Funny thing is, that on the dyno it only when slightly lean, like 12.4:1 but at the track it went all the way up to 15.62:1.
I have a dual walbro set-up going in the car this weekend and the fuel rails are at TPIS now getting modified with dual inlets and dual outlets.
Funny thing is, that on the dyno it only when slightly lean, like 12.4:1 but at the track it went all the way up to 15.62:1.
Racer
Joined: Jul 2000
Posts: 290
Likes: 4
From: Jax, FL
Not to hijack, but tpis told me the miniram fuel rail is only good to 600 fwhp. Anything over that and they need to customize the fuel rail by boring out the center divider and put fittings for feed and return on the rails for more flow.
Supporting Vendor
Joined: Oct 2004
Posts: 761
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Possibly I don't know BUT if you locate your fuel pressure gage sensor at the end of the rail where the last injector is you'll know for sure ! As long as you can maintain the desired pressure you are good to go. If the rail is restrictive the pressure will fall !
Supporting Vendor
Joined: Oct 2004
Posts: 761
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Perhaps but I do not know with regard to what TPIS told you about their rails!
What I do know is that the TPIS crossover fuel tube between the two injector rails is not in the right place. Where it is at relative to the FPR is wrong. The crossover tube should be between the two rails up front like on a LT4. The reason for this is the FPR need be at the end of the run not the beginning. Sure on a light HP application maybe no issues. But if we are talking serious power we need know the FPR is at the end of the line not the beginning ! With FPR at the end, and if fuel pressure can be maintained there, then anywhere else in the run has to be higher and consequently plenty of fuel !!!!!!!
With the FPR at the beginning, like the standard TPIS set-up, who is to say what the fuel pressure is at injectors #1 & #2 ???
What I do know is that the TPIS crossover fuel tube between the two injector rails is not in the right place. Where it is at relative to the FPR is wrong. The crossover tube should be between the two rails up front like on a LT4. The reason for this is the FPR need be at the end of the run not the beginning. Sure on a light HP application maybe no issues. But if we are talking serious power we need know the FPR is at the end of the line not the beginning ! With FPR at the end, and if fuel pressure can be maintained there, then anywhere else in the run has to be higher and consequently plenty of fuel !!!!!!!
With the FPR at the beginning, like the standard TPIS set-up, who is to say what the fuel pressure is at injectors #1 & #2 ???
Last edited by BlowerWorks; Apr 26, 2015 at 11:15 AM. Reason: spelling