T-rex & 255 intank

mustangmaniac247 · 04-18-2001, 06:09 PM

GraesyCarl,I have the T-rex to go inline and I also have a 255lph intank pump. Sufficient or overkill? Which is better,T-rex&255 or T-rex & stock?

Greasy Carl · 04-18-2001, 11:20 PM

What kind of power are you going to make?

In general it is hard to put too large of a fuel pump in a car, except for some of the race pumps that really pump a lot.

A T-rex and the stock in-tank is good for about 425 or so from what I have seen...maybe a little more but those factory 87 to 93 pumps vary quite a bit so if in doubt change that baby!

A 255 in-tank and T-rex can get you up to about 550 at the rear wheels, which is the point where the factory fuel rails really start to become a factor. Your engine could also be a factor as well, how much fuel it requires (efficiency) can affect this. No matter what you do, if you decide to shoot for big power with those pumps make sure they get plenty of voltage and watch your factory fuel pump relay, a 255 will draw a lot of juice and the factory relay can get hot and shut off especially if it is a few years old.

------------------
91 coupe, SVO block 380 windsor, Brodix Neal heads, Super victor spyder intake, 90mm Accufab, 160 lb. Bosch injectors, D2-R procharger, Dynamic powerglide, 4500 stall, 9" rear, Speed Pro injection. 1047 hp at the wheels on Dynojet dyno with 23 lbs. of boost.

NO SLO PK · 04-19-2001, 10:43 AM

Good combo! (see sig.)

------------------
Russ L
'91 LX
Procharger, 3 row intercooler, extrude honed Cobra intake, Mac full Length Headers, 30# inj., 73mm C&L, 75mm tb, E303 cam, 289 rods, ported E7 heads, MSD, T-Rex w/255 lph Walbro, 5 lug conversion, Cobra R wheels, 3.27 gears and Moser Axles.

LX XLR8R · 04-19-2001, 11:28 AM

unless u allready have a 255 intake now then i suggest a 190 with a t-rex..a 190 pump is the recremended pump for the use with external pumps

------------------
1987 black notch(ex 4 banger)
DSS 306 w/ main support...Elderbrock 6028 heads..gt-40 intake..24# injectors...70 mm tb..77 pro-m...accel 300+..mac full legnth..tremec w/ pro5oh...full MAC exhaust,off road h-pipe,long tubes, catback...ron davis radiator..subframes, control arms...CFDF II..o yea holley FPR sucks..dont buy one..
AIM=onesillynotch

302 LX Eric · 04-19-2001, 11:43 AM

LX XLR8 - why a 190 instead of the 255? Less draw on the electrical stuff?

Thanks, E

------------------
1991 5.0 LX Coupe - 38,000 miles

13.17 @ 106.14 mph w/ 2.138 60'

LX XLR8R · 04-20-2001, 10:40 AM

if i had to guess id say that it had to do with GPM and PSI of the fuel..i cant see a 255 taking that muchmore power..i know that in i belive it was the steeda catolog they say next to either the vortech external or the 190 pump they say that they are recremened 2gether when using a external pump..

mjones · 04-22-2001, 07:44 PM

when you guys are using the Trex pump and the 255 lph intank pump, are these hocked up so the intank feeds the trex or are they working in parallel. Just curious as to why you don't just use the intank pump at 255 as if I recall the trex is only a 225lph pump.
Straighten me up on this please

04-18-2001, 06:09 PM	#1
mustangmaniac247 Registered Member Join Date: Jan 2001 Location: Bakersville,N.C. USA Posts: 10	T-rex & 255 intank GraesyCarl,I have the T-rex to go inline and I also have a 255lph intank pump. Sufficient or overkill? Which is better,T-rex&255 or T-rex & stock?

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04-18-2001, 11:20 PM	#2
Greasy Carl Registered Member Join Date: Apr 2001 Posts: 13	What kind of power are you going to make? In general it is hard to put too large of a fuel pump in a car, except for some of the race pumps that really pump a lot. A T-rex and the stock in-tank is good for about 425 or so from what I have seen...maybe a little more but those factory 87 to 93 pumps vary quite a bit so if in doubt change that baby! A 255 in-tank and T-rex can get you up to about 550 at the rear wheels, which is the point where the factory fuel rails really start to become a factor. Your engine could also be a factor as well, how much fuel it requires (efficiency) can affect this. No matter what you do, if you decide to shoot for big power with those pumps make sure they get plenty of voltage and watch your factory fuel pump relay, a 255 will draw a lot of juice and the factory relay can get hot and shut off especially if it is a few years old. ------------------ 91 coupe, SVO block 380 windsor, Brodix Neal heads, Super victor spyder intake, 90mm Accufab, 160 lb. Bosch injectors, D2-R procharger, Dynamic powerglide, 4500 stall, 9" rear, Speed Pro injection. 1047 hp at the wheels on Dynojet dyno with 23 lbs. of boost.

04-19-2001, 10:43 AM	#3
NO SLO PK Registered Member Join Date: Mar 1999 Location: Arcadia, CA, USA Posts: 731	Good combo! (see sig.) ------------------ Russ L '91 LX Procharger, 3 row intercooler, extrude honed Cobra intake, Mac full Length Headers, 30# inj., 73mm C&L, 75mm tb, E303 cam, 289 rods, ported E7 heads, MSD, T-Rex w/255 lph Walbro, 5 lug conversion, Cobra R wheels, 3.27 gears and Moser Axles.

04-19-2001, 11:28 AM	#4
LX XLR8R Dirk Diggler Join Date: Feb 1999 Location: SLOATSBURG, NY Posts: 1,931	unless u allready have a 255 intake now then i suggest a 190 with a t-rex..a 190 pump is the recremended pump for the use with external pumps ------------------ 1987 black notch(ex 4 banger) DSS 306 w/ main support...Elderbrock 6028 heads..gt-40 intake..24# injectors...70 mm tb..77 pro-m...accel 300+..mac full legnth..tremec w/ pro5oh...full MAC exhaust,off road h-pipe,long tubes, catback...ron davis radiator..subframes, control arms...CFDF II..o yea holley FPR sucks..dont buy one.. AIM=onesillynotch

04-19-2001, 11:43 AM	#5
302 LX Eric or '331 LX Eric' Join Date: Jan 1999 Location: Columbus, Ohio Posts: 2,142	LX XLR8 - why a 190 instead of the 255? Less draw on the electrical stuff? Thanks, E ------------------ 1991 5.0 LX Coupe - 38,000 miles 13.17 @ 106.14 mph w/ 2.138 60'

04-20-2001, 10:40 AM	#6
LX XLR8R Dirk Diggler Join Date: Feb 1999 Location: SLOATSBURG, NY Posts: 1,931	if i had to guess id say that it had to do with GPM and PSI of the fuel..i cant see a 255 taking that muchmore power..i know that in i belive it was the steeda catolog they say next to either the vortech external or the 190 pump they say that they are recremened 2gether when using a external pump..

04-22-2001, 07:44 PM	#7
mjones Registered Member Join Date: Aug 1999 Location: London, Ontario, Canada Posts: 10	when you guys are using the Trex pump and the 255 lph intank pump, are these hocked up so the intank feeds the trex or are they working in parallel. Just curious as to why you don't just use the intank pump at 255 as if I recall the trex is only a 225lph pump. Straighten me up on this please