quote:

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Originally posted by the50ho:
I would seriously consider using an inline pump of some sort.

Many people use a t-rex pump, others prefer bosch inlines.

I will be using a t rex on mine, where as rob (5lvenom) has a different route in mind.

Either way I'd DEFINATELY consider using a nice inline, if for nothing else, safety. 12psi is a healthy amount of boost man, the last thing you want to do is not have enough fuel under boost.

Also, is your 255 standard or the high pressure model??

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high pressure
 

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Posted by Glenn (Member # 520) on :
 
what would be beter the t rex, or bosch.
 

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Posted by 1SLOWLX (Member # 558) on :
 
T-rex= mine blew out in like 500 miles or so. I wouldn't use a T-rex
 

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Posted by 5LVENOM (Member # 2282) on :
 
I think it is a misconception to use a T-Rex inline, unless you have a stock in-tank. I know alot of people use them in conjunction to a larger in-tank pump, and it works for some, but it didn't for me. I believe the T-Rex actually became a restriction in the fuel system up top, and the HP255 couldn't push enough fuel through it. I will be going with just the HP255, 42s no FMU, stock lines and stock 95 rails, next dyno, but I do think I'm going to have fuel issues, we'll see, if so its ALL getting replaced. BTW I plan on seeing 14-16 psi.

[ February 23, 2004, 12:03 PM: Message edited by: 5LVENOM ]
 

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Posted by Glenn (Member # 520) on :
 

quote:

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Originally posted by 5LVENOM:
I think it is a misconception to use a T-Rex inline, unless you have a stock in-tank. I know alot of people use them in conjunction to a larger in-tank pump, and it works for some, but it didn't for me. I believe the T-Rex actually became a restriction in the fuel system up top, and the HP255 couldn't push enough fuel through it. I will be going with just the HP255, 42s no FMU, stock lines and stock 95 rails, next dyno, but I do think I'm going to have fuel issues, we'll see, if so its ALL getting replaced. BTW I plan on seeing 14-16 psi.

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cool, i think I will stick with the 255 in tank for now, and see if that is enough. thanks.
 

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Posted by AaronC (Member # 86) on :
 
I've been told the T-Rex is a 190 lph fuel pump. In that case it would be a restriction with a 255 high pressure in tank pump. If you get an inline pump get the 255 lph inline
 

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Posted by 98slowhoe I don't have a fast car (Member # 895) on :
 

quote:

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Originally posted by AaronC:
I've been told the T-Rex is a 190 lph fuel pump. In that case it would be a restriction with a 255 high pressure in tank pump. If you get an inline pump get the 255 lph inline

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Exactly! go with a 255 inline and you will be good to go man!
 

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Posted by 93PONY (Member # 60) on :
 
Walbro GSS392 255 high-pressure in-line pump is what I use along with a GSS307 Standard pressure 255 in-tank. With -6 fuel lines & aftermarket rails, this setup has no problems keeping up with the demands of my motor.

These 2 pumps with stock lines/95 rails would be good for 500RWHP at up to 60psi FP.

BTW, 2 pumps does NOT mean twice the flow! It's insurance for lack of volume at high RPM. By most online fuel calculators, 190lph flow is all that is required for 500RWHP.....but typically a 190lph in-tank pump can not be pushed that hard. I've seen 190lph in-tank + T-rex setups push over 500RW with aftermarket fuel lines.

It's all about the restrictions in your system & how much volume your setup can flow at the fuel presure needed.

Anybody ever check the stock-type fuel filter inlets/outlets? Typically they measure .190 (less then 1/5th inch) Inner Diameter. There are several other resrictions like this in the stock setup. Eliminate these restrictions & you'll be able to push more fuel to your injectors.
 

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Posted by jmcclesk (Member # 1355) on :
 


[ February 23, 2004, 04:53 PM: Message edited by: jmcclesk ]
 

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Posted by 4RS FED (Member # 2067) on :
 
or you could put an external pump and buy my sumped gas tank
 

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Posted by J's KING Cobra (Member # 2011) on :
 
I learn something new everyday...thanks 93PONY
 

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Posted by jmcclesk (Member # 1355) on :
 
Actually the biggest restriction (smallest size) is in the fuel block just past the the inlet on the fuel rail. i cut one open once and is in the area of .110-.120 if i rember correctly.
 

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Posted by 93PONY (Member # 60) on :
 

quote:

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Originally posted by jmcclesk:
Actually the biggest restriction (smallest size) is in the fuel block just past the the inlet on the fuel rail. i cut one open once and is in the area of .110-.120 if i rember correctly.

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Yep!
I knew it was the biggest restriction....just didn't know it was THAT bad!
 

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Posted by AaronC (Member # 86) on :
 
Hey Jon, have you ever measured a 94/95 rail opening? I've heard they're bigger. A lot of blower guys use this as a cheap rail swap. Just wondering how much bigger they are.
 

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Posted by jmcclesk (Member # 1355) on :
 
Never cut one open. The general thought is that the 94-95 is a better rail. (Bigger openings) not sure how much biger though.

[ February 24, 2004, 06:08 PM: Message edited by: jmcclesk ]
 

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