Fuel question on 383 blower car
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From: Mililani, Hi
Fuel question on 383 blower car I need to know if the stock fuel lines and rail will support a 383 motor with 8# of boost. The fuel system is upgraded with 42# SVO and 255 walbro intank.
The 42# injecters wont support the HP you will be looking at. I have what you are talking about being built. I am stepping up to 50# injecters from my 42's. The rail and lines should be looked at also. i will know for sure when she goes on the dyno for tuning. That walbro intank might be at its limits too if you are shooting for big HP numbers. When you switch bottom ends i would look into another cam also. I bet that thunder 224 on a 112 is hurting you and bleeding off boost. a split on a 114lsa would be better. Let us know what you decide to do.
Kyle
Kyle
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From: Cincinnati, Ohio
From my experiences you will run into a problem with the rails first. With EFILive I noticed that while racing the right bank o2 sensor would still cycle lean during wide open throttle (and you could feel a mis-fire). After the rails things were greatly improved but I was still getting a slight fuel pressure drop at WOT so I did the lines. Now fuel pressure doesn't budge. One thing I did notice when I did the lines though is that the Racetronix dual in tank pump setup uses a T which has two 5/16 inlets and also a 5/16 outlet. I changed this to 3/8 inlet and 1/2 outlet. If the T had a 3/8 outlet to match the lines I may have not had to do the lines. They should rectify this.
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From: Chi-Town, IL
I'm going to be using 42.5LB injectors with Twin 340 walbros in the tank, CAS FP regulator, I got the Speed Inc. fuel rails, so I'm hoping that this fuel will support what the 6.0L 372c.i. motor puts out from 15-16psi.....
I might have to upgrade to 57# Siemens
I might have to upgrade to 57# Siemens
Originally Posted by BIGBOS
I'm going to be using 42.5LB injectors with Twin 340 walbros in the tank, CAS FP regulator, I got the Speed Inc. fuel rails, so I'm hoping that this fuel will support what the 6.0L 372c.i. motor puts out from 15-16psi.....
I might have to upgrade to 57# Siemens
I might have to upgrade to 57# Siemens
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Originally Posted by BIGBOS
Yea, I was afraid of that.......
Do you think the 57's will work, I don't have the $ now to convert to low impedance with a F.A.S.T. system.......
Do you think the 57's will work, I don't have the $ now to convert to low impedance with a F.A.S.T. system.......
I run 60psi at idle and goes up to 70+psi in boost with my 42.5#. With 104 fuel. Hardly any timing and run so lean that most would cry if they knew.
Just be carefull. Don't want to... 
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From: Chi-Town, IL
Yea, I run on 100 all the time, so I will be tuning off of that........
I trust the tuner over at Speed Inc. he knows his **** about F.I. cars.........
Currently my pressure is at 65-66 at idle and doesn't drop, well it did once the belt actually grabbed and I saw boost.....
I think my single pump setup isn't keeping up, we did the hotwire kit and the CAS regulator and now its running out........
Twin 340's are defiently in order.....
I trust the tuner over at Speed Inc. he knows his **** about F.I. cars.........
Currently my pressure is at 65-66 at idle and doesn't drop, well it did once the belt actually grabbed and I saw boost.....
I think my single pump setup isn't keeping up, we did the hotwire kit and the CAS regulator and now its running out........
Twin 340's are defiently in order.....
Do you think a T-Rex inline pump w/ 57's would work with a Walbro 340 intank and Bigger rails?? I was thinking about using 8an feed and use the stock feed as my return. Before with 42's and the one 340 i would see 64-66 psi of fuel pres. at idle and then under full boost (11PSI) it would drop down to 56-58 psi. Mine being a 98 im not sure if i can do dual 340 intanks. Anyone know..... it will be a 8.5:1 383 Cogged for 15-16 psi.
Joined: Mar 2002
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From: A Racetronix dealer near you...
The 5/16" hardware used in our DP system does not impede its performance on the 99+ plastic fuel modules. The 5/16" hardware is required in order to use the flex-hose which prevents major problems inherent with rubber lines. The ID of the factory lines are a far greater restriction. A DP Racetronix system can easily support 700RWHP with factory lines and well over 800RWHP with upgraded feed & return lines and a rail-mounted regulator / return system.
A T-Rex pump is only rated at 200L/Hr where the Walbro GSS340 is rated at 255L/Hr. A Walbro GSL392 is the in-line equivalent to the GSS340. An in-line pump will extend the high end operating system pressure by preventing volume drop-off but do very little to extend the 255L/Hr rating of the in-tank pump.
For a 98 f-body a single in-tank Racetronix system with MSD booster will support upwards of 700RWHP when used with a rail-mounted regulator / return system.
A DP system will support more but it is a custom order item and requires your module to be sent in for adaptation.
Siemens 3172's will provide apx. 66lb/hr at 400KPa / 58PSI. A maximum DC of 80% is recommened for stable injector timing control under all motor operating conditions.
A T-Rex pump is only rated at 200L/Hr where the Walbro GSS340 is rated at 255L/Hr. A Walbro GSL392 is the in-line equivalent to the GSS340. An in-line pump will extend the high end operating system pressure by preventing volume drop-off but do very little to extend the 255L/Hr rating of the in-tank pump.
For a 98 f-body a single in-tank Racetronix system with MSD booster will support upwards of 700RWHP when used with a rail-mounted regulator / return system.
A DP system will support more but it is a custom order item and requires your module to be sent in for adaptation.
Siemens 3172's will provide apx. 66lb/hr at 400KPa / 58PSI. A maximum DC of 80% is recommened for stable injector timing control under all motor operating conditions.
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RaceTronix's,
I have your intank kit in my 98 and your saying that all i should need to support my blown 383 is an MSD boostapump and bigger rails, a regulater and what kind of return system?? I plan on running 8an to the rails and trying to use the stock feed lines as my return. I was told the stock feed was about the same size as 6an. Is that true and will it work?? Your 57# injecters or 66# at our 4 bar system looks like they will work for me. How many sets do you have on hand and how long will they be $59.99 apiece?? Thanks for your time and help.
Kyle
I have your intank kit in my 98 and your saying that all i should need to support my blown 383 is an MSD boostapump and bigger rails, a regulater and what kind of return system?? I plan on running 8an to the rails and trying to use the stock feed lines as my return. I was told the stock feed was about the same size as 6an. Is that true and will it work?? Your 57# injecters or 66# at our 4 bar system looks like they will work for me. How many sets do you have on hand and how long will they be $59.99 apiece?? Thanks for your time and help.
Kyle
Joined: Mar 2002
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From: A Racetronix dealer near you...
Originally Posted by BIGBOS
You guys make a 66# as well, tuning issues with these?
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Joined: Mar 2002
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From: A Racetronix dealer near you...
Originally Posted by BIGBOS
Would they work better for my setup compared to the 57#?
The Siemens 3172 injector which flows 57lb @ 300KPa / 43.5PSI will flow apx. 66lb/hr @ 400KPa / 58PSI which is the fuel system pressure used in a LS1.
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I am in the process of replacing my stock lines, rails and 255 intank pump for the Speed Inc system with billet rails , regulator, -10 in and -6 return lines with a Aeromotive 420 lph eliminator pump and Siemmens 55 lb. injectors on my boosted 388. Tunning should be done in the next 3-4 weeks and I will post the results
Dave
Dave
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From: A Racetronix dealer near you...
Originally Posted by SILVER BULLET
I am in the process of replacing my stock lines, rails and 255 intank pump for the Speed Inc system with billet rails , regulator, -10 in and -6 return lines with a Aeromotive 420 lph eliminator pump and Siemmens 55 lb. injectors on my boosted 388. Tunning should be done in the next 3-4 weeks and I will post the results
Dave
Dave
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From: Chi-Town, IL
Sorry, I was confused there for a second
Didn't read that the 57's are a 66 with the LS1 fuel setup, with my Speed Inc. rails, rising CAS regulator, and twin 340's I think that should be enough to keep up with a 15-16psi setup on a Procharged 6.0L 372c.i. Iron block motor.....
Didn't read that the 57's are a 66 with the LS1 fuel setup, with my Speed Inc. rails, rising CAS regulator, and twin 340's I think that should be enough to keep up with a 15-16psi setup on a Procharged 6.0L 372c.i. Iron block motor.....
Last edited by BIGBOS; Dec 23, 2003 at 06:38 PM.