well i see a lot of people using the 340s is that a lhp rating or a pump number? I have not had the car dynoed maybe its pushing a lot more power than i thought(460rwhp guess @ 12psi). My brother the Mustang boy says theres no way a 255 can support my power. Rich was at 743rwhp on a 255 and a boost a pump right? How much power can a 255 with stock lines/ reg hold? What pump should i go with or just try a boost a pump or just hook up the ATI inline? I want a reliable pump this is daily driven 200miles/wk.

 

you would need to run a 255 in line and a 255 in take to make it work. make sure you by a 255 inline and not a 190. because if you have a 255 in the tank and a 190 in line it wont work as well. the 190 will slow the fuel down

i had a 255 in line and a 255 intake and i had 530 rwh with no problems. i have just updated to all weldon because i went with a bigger blower.

 

I dyno'd 580 rwhp running a 340 pump and an inline TRex (I believe it's only rated at 190 lph). I just removed the TRex as I'm concerned it might be restricting the system; I haven't re-dyno'd yet but my fuel pressure gauge isn't showing any drop in pressure at WOT.

 

Old setup: Bosch 255lph intank, stock lines, stock regulator, Boost-a-Pump. 733rwhp with an 11.5:1 AF ratio with nitrous and 613rwhp (M6) without the N20 (14psi boost).

Rich Krause

 

Well i have the in-line pump that came with the D1 kit, but i think i might just go with a larger intank. 340 is good till what hp?

 

Get a larger intank and ditch the in-line pump. I am not very familiar with the detailed operational characteristics of the Walbro 340, but it supposedly is better than the Bosch. I think I was the limit of what that pump (with the BaP) would support.

Rich Krause

 

94Slug:

I had EXACTLY the same problem. I mean identical. I had a Walbro 340 in-tank and the ATI inline. With the ATI installed OR bypassed, I ran out of fuel, to my surprise.

I decided to go with a Racetronics dual intank.

 

Another thing to consider is the efficiency of the engine.

A blower motor with a large cam/lots of overlap will not be as efficient as a motor with a smaller cam/low overlap and therefore will require more fuel at the same power level.

 

97TA-WS6-Con:

I thought you had stated last year that your Fuel Filter was also F'D up which could have caused some of your restriction. Mabee he should also check there too.

94SLUG,
Do you also have the hard wiring harness from racetronics?
(Its suposed to give an aditional 12-15% flow with the Wiring harness)
Are you seeing full 12# of boost before it leans out?
And what kinda cam are you running?

I am just curious cuz I will be running a similar set up and want to know what to avoid.

Thanks,
Claude

 

94SLUG,
Do you also have the hard wiring harness from racetronics?
(Its suposed to give an aditional 12-15% flow with the Wiring harness)
Are you seeing full 12# of boost before it leans out?
And what kinda cam are you running?

I am just curious cuz I will be running a similar set up and want to know what to avoid.

Thanks,
Claude [/B][/QUOTE]


http://cam355z.cz28.com The website has most of the mods on it. The cam is 224-236 501i 516e 10 lbs @ 5000rpm then lean. No harness, i think i might just go to dual intank pumps or 340 with KB boost a pump. You have a 383 though so you might need a bit more than me. Who has the dual intank pumps and how much $$$.

 

Racetronix has the daul intank pump for around 500 bucks and I was told by thier tech support that the dual intank pump should support 650-700 REAR Wheel HP with the stock Fuel Lines and 800+RWHP with upgraded lines, regulator and rails.

Here is thier website http://www.racetronix.com
And you can contact them by emailing sales@racetronix.com


Hope that helps,
Claude

 

A Walbro GSS340 should be able to support 550RWHP with the Racetronix harness for the most fuel hungry motors assuming you are not running sky-high FP with an FMU or have some other less capable pump in line with it.?

A good way to test your current fuel volume is...
Fill your tank half full of gas. Adjust the FPR for 43-44PSI and leave the vacuum line off of it. Run the return line from the FPR into a jerry can while idling the car. Time how long it takes to fill the jerry can to 5 US gallons.

Jack
Racetronix

PS. Please tell your brother that last summer Paul from J&P up here was running 550RWHP doing 10.0's all weekend long at the year's final event. He was running a Walbro GSL392 which is the in-line version of the GSS340 (same flow spec) and a Racetronix wiring harness. We installed this 2 days before the event as his Aeromotive A1000 was dropping pressure under WOT / high boost. The Racetronix system was rock solid @ 60PSI. It looked ridiculous under the car as the pump was half the size of the Aeromotive filter it was attached to. Many people tend to underestimate the capability of a Walbro pump due to its price and size.

 

[QUOTE]Originally posted by Racetronix
[B]A Walbro GSS340 should be able to support 550RWHP with the Racetronix harness for the most fuel hungry motors assuming you are not running sky-high FP with an FMU or have some other less capable pump in line with it.?

Whats the next step up from the GS340? Is the dual intank setup somthing you guys have. Where to order this besides more performance, i felt more retarted after talking with them.

 

This is a very interesting post. I was just considering reinstalling my old p600b (which has been off the car for around 4 years) using just the factory intank pump and the ati inline pump. My car currently has a heads/cam package but it sounds as though my fuel system might not be sufficient for the blower.

 

What injectors are you runing and do you have a FMU? What size pully/pullies? The worst part to slack on a boosted motor is the fuel system. I dont like the thought of 2 pumps intank and in-line. I have the ati in-line but i dont want to use it nor the fmu. Does anyone have a part number for the dual intank setup along with the make?