WS-6_2002

iTrader: (10)

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.

NA$TY-TA

iTrader: (21)

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

WS-6_2002

iTrader: (10)

I am not sure of what cam I'm going to go with. Any suggestions? Also is there anyone who sells a premade bigger fuel pump kit that just drops into the tank?

2001WS6Vert

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.

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

TwnTrboCE

iTrader: (43)

Don't waste your time with the 42.5#. The 57# will be working hard to keep up with the combo you mentioned.

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.......

WS-6_2002

iTrader: (10)

Who makes this double pump system and where can I get one?

TwnTrboCE

iTrader: (43)

I'm sure they will work. But they will be working very hard. You will have to run a lot of pressure. Just tune it safe and use good fuel.
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...

BIGBOS

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.....

NA$TY-TA

iTrader: (21)

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.

Racetronix

iTrader: (2)

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.

NA$TY-TA

iTrader: (21)

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

BIGBOS

You guys make a 66# as well, tuning issues with these?

Racetronix

iTrader: (2)

Siemens 3172's will provide apx. 66lb/hr at 400KPa / 58PSI.

BIGBOS

Would they work better for my setup compared to the 57#?

Racetronix

iTrader: (2)

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.

SILVER BULLET

iTrader: (1)

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

Racetronix

iTrader: (2)

The Aeromotive pumps are WAY overrated. It is not uncommon for a Walbro GSL392 to outflow an A1000. The Aeromotive pumps MUST be gravity fed which means that the pump MUST be mounted below tank level with a -10 or -12 feed and pre-filter. Failure to do so will cause quick pump failure. The motor windings are held together with epoxy which breaks apart from exposure to the solvents in pump gas which inevitably leads to pump failure. The Aeromotive pumps are VERY noisy, draw more current and heat the fuel more. Apart from your lines, rails and regulator the Aeromotive pump is more of a liability on a street driven car than an asset. To some people they look impressive being all shiney red and huge but that is not what makes for a good reliable pump system.

BIGBOS

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.....