EXACTLY!!!
Found out the hard way, when I had to come back for ANOTHER session on the dyno (after removing the T-Rex, and leaving the Walbro 255lph).
Made 527rwhp with just the Walbro.

 

im getting a v-1 s trim next week. im gonna install a 255 in tank pump. so your sayin i dont have run the t-rex?? with a 255 in tank.

 

im getting a v-1 s trim next week. im gonna install a 255 in tank pump. so your sayin i dont have run the t-rex?? with a 255 in tank.

Yup, no need for T-rex, if you put the 255 Walbro in the gastank.
Make sure you get the high-output Walbro 255, I think there may be more than one 255lph pump.

 

Thanks, Drudis

Any other input on this one?

 

Anderson Ford includes both pumps in his Vortech kits, I dont know the specs on the T-rex in his kits, but Rick Anderson knows what he's doing, might want to talk to him, I just bougth one of his Vortech kits and he recommends installing both.


Thanks

 

I bought mine as part of a kit from Lidio @ AlternativeAuto.com . He knows what he is doing also. Works fine for 8# boost on stock motor, and made 330rwhp... One PULLER in-tank and one PUSHER T-Rex inline.
My problem was after I got tto the 440rwhp, that was about all it would support. FInally, added a bigger cam and 42# injectors, and shooting for 500+rwhp. It ran out of fuel. Got the (micorscopically) larger SN95 fuel rail, and removed the T-rex (left 255-in-tank), and fuel was no longer an issue.
Thats MY story.

 

So Darius,
You didn't change any lines or anything? Just the rails and the intank 255? I'm wondering about that myself right now. Just put a Vortech on the 351 car and am debating about the inline (I know Saleen never used an Inline when they had their S351 cars)

 

Anyone else have some input on this?

 

I use an inline but it's not a T-Rex. It's a Walbro 255lph inline.

Here's a thread that I started on the S/C forums. It has a pretty good rundown in it:
http://www.corral.net/forums/showthread.php?t=513001

Henry

 

My tuner recently told me to run the T-rex with my walbro 255 lph high pressure intank. I'm running a S-Trim with a powerpipe and 42's. I think I'm going to leave just the intank for now. Hopefully it's enough.

 

I am running both-- and the car runs well....

 

I see that some people run them together, some don't. My question is is it really worth the extra time to install the T-Rex? Will it make that much of a difference? I really don't know.

 

To answer your question directly. It depends on your horsepower range. One Walbro 255 just might be enough, however, here is what I found out recently and here's the combination:

Stock rails, stock lines, 42# injectors, Walbro 255 inline, Walbro 255 intank

Back in December we dyno'd my car (remember that it's an automatic) and we found that right around 450rwhp the car started to run very lean and the stock lines, injectors, etc just weren't enough.

I've heard of folks running stock lines, rails, and 42's with this setup through 5 speed cars in excess of 500rwhp, however, I wasn't that lucky.

P.S. In my humble opinion, the T-Rex is a piece of junk.

 

Just out of curiousity, why do you think it's a piece of junk?

 

Just out of curiousity, why do you think it's a piece of junk?

Had a few of them fail and leave me stranded.

 

GSS340 is the Walbro 255lph high pressure in-tank pump. I have one sitting on my bed right now, is how I know. I think I've heard they're good to 550rwhp?

Brian