If the pump in the tank is a high pressure pump, you should be able to get an easy 500RWHP. 520-530RWHP is probably the limit of that set up. After that, you are probably starting to gamble.

As far as cost effective way to upgrade from there, I'd be interested in knowing that also

 

Well hopefully someone will chime in. This setup clearly wasn't too expensive, but I'm wondering how much it'll cost to get more fuel delivery.

Do you know how much the stock rails will support on my 97 Cobra?

 

You can get 600 out of them.

 

I currently have a Walbro 255lph in-tank pump coupled with a Walbro 255lph in-line pump. How much power is safely supported by this setup?

Also at the point that this setup is no longer safe, what is the most cost-effective upgrade?

Thanks very much.

I hit approx 480rwhp (remember I have automatic) before the lines, rails and Walbro 255 inline / Walbro 255 intank were maxed out. I ended up moving to sumped tank, -8 AN supply and -6 AN return, larger injectors, etc.

-Tim

 

I hit approx 480rwhp (remember I have automatic) before the lines, rails and Walbro 255 inline / Walbro 255 intank were maxed out. I ended up moving to sumped tank, -8 AN supply and -6 AN return, larger injectors, etc.

-Tim

How much will the stock rails support?

 

How much will the stock rails support?

I mentioned 480rwhp in my last post and that is incorrect...... I looked through my logbook and it was actually around 450rwhp when I had the stock rails, lines, and the pumps mentioned max'd. However, keep in mind that I have an automatic which eats up horsepower as well. So with a 5/6 speed things will be different.

Cheers,
Tim

 

I mentioned 480rwhp in my last post and that is incorrect...... I looked through my logbook and it was actually around 450rwhp when I had the stock rails, lines, and the pumps mentioned max'd. However, keep in mind that I have an automatic which eats up horsepower as well. So with a 5/6 speed things will be different.

Cheers,
Tim

Jesus Tim your car is Cursed! A tranny killer and an underpowered turd. j/k

I made 516rwhp with a Walbro 255 in-tank, T-rex, stock rails/lines and a set of 42's. I'd imagine 2 good 255's would be good for 550 or so with stock rails/lines.

 

What do you guys think about a 255 high pressure intank and a BAP, no inline pump.

 

I've said it before, I feel that the intank/inline route is a bad one. Here are a couple of my reasons. I'm no expert btw.

Walbro is a cheap pump.
One in the tank is going to last longer because it has fuel to keep it cool. External is cooled by some fuel but it might not last as long as the intank.

My main reason(this happened to me) is Unless you have a wideband 02 on the car and monitor it all the time, One pump can go bad and you won't see a loss of fuel pressure just volume.

I went the 03 cobra fuel pump route and consider it to be one of the safest street pumps to go with. Its a high quality factory pump that will last a while.

My single 255BAP 42's combo made 535rwhp and was out of fuel.

03 cobra/BAP 60's made over 600 rwhp with alcohol injection also, on stock lines/rails

 

Jesus Tim your car is Cursed! A tranny killer and an underpowered turd. j/k

I made 516rwhp with a Walbro 255 in-tank, T-rex, stock rails/lines and a set of 42's. I'd imagine 2 good 255's would be good for 550 or so with stock rails/lines.

What does your car run at the track again? :evil: :lol:

 

I got about 540 out of my Walbro set up with intank and inline. Stock rails, I am told, are good to about 600 rwhp. but I wouldn't go that far unless I has pushing a much of pressure through them like with an FMU.

If anyone is interested, here is my 03 tank/line/rail conversion so I could support more power and use dual pumps. I upgraded to aviator pumps and it works like a champ in an 03 harness. I think 96-97 is actually easier and doesn't require the adaptor shown.

http://home.austin.rr.com/mureen/fuelingbeast.zip

Chris

 

My setup uses a 255 intank pushing out to a Bosch 390 mounted to the bumper, -8 line to Aeromotive rails and 55# injectors. Mine has made a high of 592 rwhp and is currently tuned to 571 rwhp and has no fueling issues.

Why don't you also run the Bosch 390? Or run 2 255's in parallel instead of in series?

 

Would it be difficult for me to ditch my 255 in-line, buy another 255 in-tank, and then run each pump to a bank of the engine? How would that work? Would that bring me up to a safe 600rwhp limiting point? If the rails are an issue I could always upgrade to Aeromotive rails with this setup -- what do you think of that?

 

Would it be difficult for me to ditch my 255 in-line, buy another 255 in-tank, and then run each pump to a bank of the engine? How would that work? Would that bring me up to a safe 600rwhp limiting point? If the rails are an issue I could always upgrade to Aeromotive rails with this setup -- what do you think of that?

I would avoid that setup. If you lose one pump, you lose the entire bank.

At least if its in series, and you lose one pump, you will still get some fuel to the engine.

Sump the tank > -10 to a Y-block > 2 255's > Y-block > -8 up to motor > Y-block > -8 to back of each rail > Aeromotive rails > 60# injectors> -6 out of each rail into Aeromotive or Weldon regulator > -6 back to the tank

This will work for 600+ rwhp and beyond.

 

How difficult/expensive is it to have the tank sumped? Do I have to buy a new tank?

 

How difficult/expensive is it to have the tank sumped? Do I have to buy a new tank?

Any reputable Mustang shop should be able to sump your stock tank for you. Have them put in an extra outlet so you can drain your tank whenever you want to run race fuel.

 

You can buy the 03 tank/pumps for like 600 from a dude who posts on the corral that works for ford.

 

You can buy the 03 tank/pumps for like 600 from a dude who posts on the corral that works for ford.

 

studder hahaha

 

doh.

 

You can buy the 03 tank/pumps for like 600 from a dude who posts on the corral that works for ford.

And how much does that setup support? Would the lines have to be upgraded?

 

03 pumps are pretty small individually. I think 135lph or something like that. With a BAP you can support over 600 rwhp easily. However, I replaced the 03 pumps with Aviator pumps which are 271lph each and with dual ones I should be able to support over 800 rwhp given larger lines and rails.

YMMV

Chris

 

what is BAP?

 

And how much does that setup support? Would the lines have to be upgraded?

Well tim351 is pushing 630+ on his car with the 03 pumps + boost a pump. I know that he was having issues with his tank sucking in air or something along those lines when it got to 1/4 tank. That is with his stock tank though and boost a pump/03 pumps. YOu get rid of that if you get the 03 tank as well.

There is a thread somewhere on here with a gt car with a built 4v engine that is making 750 rwhp on 03 tank/pumps + boost a pump.

 

Guys.... his car is a '97 and has a return style fuel system - he'd need to do an EEC swap from a returnless year car to go to the '03 Cobra tank and pumps - his EEC has no hardware to control a returnless system. So he'd need a late model EEC, a late model harness, an FPDM, Cobra Tank and pumps and a retune - add it up. On a returnless style ('99 and up) GT, the '03 Cobra tank and pumps are the only way to go. I suppose you could run an '03 Cobra setup as a return style, but those types of FPs (Turbine style) are not meant to go at full power all the time like a return system FP (Gyrator style). For right now his fuel system is adequate. If it becomes inadequate, then I'd suggest he consult what jmeirs posted, that's the way I'd do it.
Don