vortech t-rex verses holley 255 forced induction ??

ppartain

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Oct 30, 2011

#1

• Oct 30, 2011

• #1

got another vortech install question. i have a holley blue 255 fuel pump that was in my car when i bought it and i was going to add the t-rex boost pump from vortech and use 42lb injectors but i noticed holley had a pump out now that was 255 forced induction. if i could get enough flow from it instead of all the extra work involved in the t-rex i would be happy. im planning on 8-10psi max boost.

 

ppartain

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Oct 30, 2011

#2

• Oct 30, 2011

• #2

this is the info on the pump

•255 LPH Feeds up to 750 HP at 60 psi
•Proven Gerotor Design
•Compact Enough to Fit in Existing Hanger Assemblies without Modification
•Complete Kit with All Drop Parts, Accessories and Installation Instructions
•Inlet Filter Meets or Exceeds Original Equipment Specifications and Provides Improved Filtration/Durability

Electric In–tank Pumps – EFI
255 LPH Forced Induction Mustang PART #: 12-915

 

Onefine88

Previously 89SSC18

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Oct 30, 2011

#3

• Oct 30, 2011

• #3

I have that pump. Its been on the car for 4 yrs now and handles 440rwhp with no problems.

 

ppartain

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Oct 30, 2011

#4

• Oct 30, 2011

• #4

the holley? is it an easy factory type install? did you have to upgrade any lines or rails? what does 440 rwhp equal at the motor? i have about 420 at the motor so im guessing another 100-125 at 8psi. is yours supercharged? injector size? im thinking instead of running wires to the fuse box, drilling holes through the trunk to mount the t-rex the holley would be an easier install. now is there such thing as over pressurizing the lines as in too much fuel pump?
thanks

 

Onefine88

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Oct 30, 2011

#5

• Oct 30, 2011

• #5

Its simply a replacement intank pump. No upgrades or mods needed anywhere. My SSC is supercharged and makes about 11psi. 42lb injectors and no FMU.

It makes 441 at the wheels. I'm guessing using 15-18% parasitic powertrain loss thats roughly 490-500ish at the crank?

 

ppartain

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Oct 30, 2011

#6

• Oct 30, 2011

• #6

give me some more tips ... you putting 11psi to a stock block? how high rpm for shift? what about tuning? computer, single burn chip? problems to watch for tuning? are you running a boost/timing control box or computer handeling it?
thanks

 

2000xp8

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Oct 30, 2011

#7

• Oct 30, 2011

• #7

The holley pump is probably just a walbro High pressure gss340.
Which can handle around 500rwhp.

 

ppartain

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Oct 30, 2011

#8

• Oct 30, 2011

• #8

yea somewhere i seen that it had that wrote on the pump. if thats all i need then im getting one tomorrow instead of the t-rex install.

 

2000xp8

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Oct 30, 2011

#9

• Oct 30, 2011

• #9

ppartain said:

yea somewhere i seen that it had that wrote on the pump. if thats all i need then im getting one tomorrow instead of the t-rex install.

Click to expand...

May want to just buy the walbro version, they are usually alot cheaper.

 

Onefine88

Previously 89SSC18

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Oct 31, 2011

#10

• Oct 31, 2011

• #10

2000xp8 said:

The holley pump is probably just a walbro High pressure gss340.
Which can handle around 500rwhp.

Click to expand...

Yep, same one. I bought the Holley unit but once unpackaged its just a Walbro gss340 high pressure pump. I originally had the standard 255 lph pump installed back when the SSC was naturally aspirated . But, It couldn't handle the added fuel needs approaching 400rwhp. Actually swapped them out while at the shop being dynotuned.
"huge difference"

Yes I am running an MSD 6BTM boost retard box. My car has been professionally tuned on a dyno using an SCT chip. Max rpm was 5800.
Since its tuned with a chip, the boost retard function of the 6BTM is not being used because timing is being adjusted in the computer. (I keep it set at 0)
It's still amplifying the ignition like a "non retard" 6AL unit.

However I do occasionally turn up the knob and manually retard timing when its real hot outside or I might be pushing it hard on a road course. Just a little extra insurance.

 

ppartain

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Oct 31, 2011

#11

• Oct 31, 2011

• #11

shifted or rev limiter chip at 5800?

 

Onefine88

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Oct 31, 2011

#12

• Oct 31, 2011

• #12

ppartain said:

shifted or rev limiter chip at 5800?

Click to expand...

Shifted. There's a 6K pill in the MSD but I never touch it.

It's got a safe tune and my friend who tunes my cars says I can't hurt it but I'm over protective of my SSC and hardly never push it too hard in the higher rpms.

But,,, It will fly

Good Luck