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Just Had My Car On The Dyno And It Sucked :(

bax_nz

By bax_nz,
in Engines & Forced Induction

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The Mafia Grand Master

The Mafia

Posted
Posted

to all of those people supporting the 255lph walboro pump - they are shit. You need to get the Walboro 255lhp HP version. The high pressure version handles pressure a lot better than the standard 255 one. The standard one is for a NA car.

And I Don't care what you all say - I have one, and I have seen what they do. As soon as you up the boost beyond 10psi, you are playing with fire. The pump can't handle pressures above 50psi very well at all.

Standard fuel rail pressure - 42psi + Boost (10psi) = 52psi.

As soon as this pump reaches 55psi - 60psi, the flow drops dramatically.

Have a look at the Blue line on this flow chart -

walboroflow.jpg

bubba Grand Master

bubba

Posted
Posted

I picked up a brand new genuine Bosch 044 pump off ebay for $204.50 + delivery. Going to mount it externally in the boot and draw through the standard intank pump which my mechanic assures me is fine.

femno Grand Master

femno

Posted
Posted
So are you saying my mechanic is a liar? personally I would take his word over some random on the internet - no offence :)

Does your mechanic deal with much performance stuff? When it comes to performance some mechanics dont know there arse from their elbow, all they know is servicing etc etc standard stuff.

Talk to a performance workshop or fuel systems shop. Theyll tell you the same thing.

bubba Grand Master

bubba

Posted
Posted (edited)

He has a 10 sec RB30DETT powered VH that he built himself, does that qualify? I also went to school with him and he is a very close friend :)

I had the same thoughts as you when he first told me to mount it externally, he assures me it will be fine. Either way, he's putting it in so if it doesn't work he can redo it .

Edited by bubba
Adriano Grand Master

Adriano

Posted
Posted

I dont understand why people insist on fitting fuel pumps in the boot, its illegal for a reason, people do die from cars catching on fire. Ever wonder why there isnt one car that is complied that has the fuel pump in the boot?

STATUS Grand Master

STATUS

Posted
Posted
I dont understand why people insist on fitting fuel pumps in the boot, its illegal for a reason, people do die from cars catching on fire. Ever wonder why there isnt one car that is complied that has the fuel pump in the boot?

its because the mechanic is lazy...... simple as that.

siddr20 Grand Master

siddr20

Posted
Posted (edited)

My walbro one is already installed, so i cant check if there/where any numbers on the side. .

however on the box, it says..

10258

Walbro High Flow Intank P

<barcode> JE04

10258

So can anyone confirm which model i got?

cheers

Edit: found it:

Cool i got the HP version!! the GSS-342.

Edited by siddr20
RipNGrip Collaborator

RipNGrip

Posted
Posted

Hey champ,

16 is not really a good air/fuel ratio! in fact thats really really lean. I would suggest a fuel filter change, injector clean, and possibly a fuel pressure reg and DEFINATELY a fuel pump. There are a few around 040 bosch, walbro or nismo or gt0r pumps. it really depends what your power goal is. A re-map of your ecu or a piggyback fuel computer like a SAFC1/2 or a Neo will help harness those ponies.

My r32 gts4

rb20det

rb25 highflow turbo stage 2

splitfires

remap

fuel pressure reg

3 inch exhaust

stock bov

FMIC

Boost 16 psi

AFR 12.5

gt-r gearbox

exedy HD clutch

158.5 aatkws

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