Vortech T-Rex pump question

DarkProphet

Founding Member

Aug 19, 2002

391

0

0

Quakertown, PA

Oct 10, 2006

#1

• Oct 10, 2006

• #1

Hey guys, my car is still up at the dyno and the only thing holding it back now is that its running out of fuel around 4k rpms. My dyno tuner suggested getting a t-rex and that if I can (which I know I can) install it myself to save money, then have him double check the tune once I get it on.

Heres my question. I found this on summit, which is a complete kit, but it says its only good for 87-93. If i remember, the fuel filters on a fox body are different from the sn95, but im not sure. Does anyone know if this kit will work for my car? Or if it doesn't can someone suggest another inline pump kit?

Heres the kit:
http://store.summitracing.com/partdetail.asp?autofilter=1&part=VOR-8F201-265&view=32&N=700+0


Thanks alot!

 

94-302-vert

Active Member

Aug 16, 2004

1,947

2

36

NE CT

Oct 11, 2006

#2

• Oct 11, 2006

• #2

I would change the in-tank pump to a 255#er and maybe get an AFPR.

I don't like the idea of the add on pump to increase flow and pressure.

 

FlyBy763

Member

Apr 23, 2004

439

0

17

Palm Bay, FL

Oct 11, 2006

#3

• Oct 11, 2006

• #3

Yeah, Just buy an in tank 255 High Pressure pump. GSS430....dont get the high flow 255.

 

ProKiller

Founding Member

Apr 26, 2002

3,064

15

78

PA

Oct 11, 2006

#4

• Oct 11, 2006

• #4

kenne bell boost-a-pump is out there too.

 

DarkProphet

Founding Member

Aug 19, 2002

391

0

0

Quakertown, PA

Oct 11, 2006

#5

• Oct 11, 2006

• #5

I already have a 255 lph walbro pump and an adjustable fuel pressure regulator, Im just running out of fuel.

 

KBCobra95

New Member

Aug 28, 2005

356

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0

North Carolina

Oct 11, 2006

#6

• Oct 11, 2006

• #6

How much Hp are you pumping out? It may be time for larger injectors.

 

DarkProphet

Founding Member

Aug 19, 2002

391

0

0

Quakertown, PA

Oct 11, 2006

#7

• Oct 11, 2006

• #7

It put out 350hp and 365lbs of torque at 4500 rpms when it ran out of fuel. I have 36lb injectors so they should be fine. Im running 45psi of fuel pressure, and it starts to drop at 4500 rpms, and eventually gets down to like 10 psi at 5200.

 

94-302-vert

Active Member

Aug 16, 2004

1,947

2

36

NE CT

Oct 12, 2006

#8

• Oct 12, 2006

• #8

You need larger injectors I think... I did an online calc and it estimates you need approx 47#ers... So I would be thinking to go to 60#ers... And maybe a high pressure pump. But a 255 should be able to keep up with that engine easy enough...

Is the AFPR going wacky due to the boost pressure?

 

Wi Stang

Member

Jun 27, 2004

248

0

16

Fountain City, WI

Oct 12, 2006

#9

• Oct 12, 2006

• #9

I think that your fuel pump should be big enough, unless there is something wrong with it. I have the same fuel pump, but 42lb injectors, and was able to get almost 500hp at the wheels without my fuel pressure dropping.

 

ProKiller

Founding Member

Apr 26, 2002

3,064

15

78

PA

Oct 12, 2006

#10

• Oct 12, 2006

• #10

buy either the t-rex or a similar boost-a-pump and put that on there and see what it does. make sure you have the vacuum tube on that runs from the AFPR to the intake. the injectors you have should be fine. i was running 24#s and dyno'd 390rwhp and didn't run out of fuel. thats with the 255lph pump, t-rex and an aeromotive AFPR.

EDIT: are you running an FMU at all?

 

DarkProphet

Founding Member

Aug 19, 2002

391

0

0

Quakertown, PA

Oct 13, 2006

#11

• Oct 13, 2006

• #11

No FMU, Yes the vacuum tube is on. When my car was on the dyno, it was dropping fuel pressure at 4500 rpm's like I was saying. It goes from around 45psi down to 20ish at 5k rpm's. My tuner is the one who said I needed the inline pump. The guy before me put the in tank pump in, so it might be different then the 255, but thats what he told me was in it.

Also, I have found that they make a kit specifcally for teh 94-98 guys, but only a few places have it, and none have it in stock.