mk1 gti fuel flow rate ?

[antone28 0]

Does any one know the specs of the bosch fuel pump that is fitted to a mk1 gti , i know they run quite hi pressure but im not sure how it would compare to say ,a walbro 255 lph or bosch 044, im thinking of using one i have spare as an in line pump on my vr6t

[Devildub_06 0]

As a MK1 GTi is a N/A 4 pot, I doubt it would be up to the job, I would personally go straight for uprated. I believe though that the school of thought is divided on the use of in lines or in tanks. 407BHP VR and Kevhaywire seem to know a hell of a lot and I think each one runs the pumps you mention above.

[FishWick 21]

K Jet CIS pumps will work to a point, but they are primarily high pressure rather than high flow.

Turbo engines need flow / volume aswell as pressure and stability. As the pressure on the fuel regulator increases through boost, the pump has to work harder and flow reduces proportionally to pressure demanded. A K jet pump of the Golf GTI variety may not keep up at high flow demands. A UR Quattro pump may stand a better chance, but why bother when a £90 Walbro intank 255lph will support over 500hp? Even slots into the Stock pump housing. Couldn't be easier or neater. I've used 255s for 4 years with no problems.

Unless you're exceeding 550-600hp, there's no need for an external pump. I think some people just fit externals for bragging rights, but if I were going to fit an external, it would be the SX 18208 or 18207.

[Devildub_06 0]

Kev, is it a pain fitting a Walbro 255 in tank? I'm soon to be embarking on an extensive project soon involving and OBD1 VR6 Golf. While i'm at it, and not meaning to open a tin of worms with the VR6T crowd, but is it worth my while Aiming for 350bhp with an OBD1 car? It's available, bodywork is lovely but has been laid up for a while but aim to be taking it apart and rebuilding the engine and box myself. Knowing you're one of the smartest VRT owners on here would appreciate your advice.

[antone28 0]

vince said somthing about having to use a spacer for the intank type, apparantly is narrower than standard

[FishWick 21]

Kev' date=' is it a pain fitting a Walbro 255 in tank? I'm soon to be embarking on an extensive project soon involving and OBD1 VR6 Golf. While i'm at it, and not meaning to open a tin of worms with the VR6T crowd, but is it worth my while Aiming for 350bhp with an OBD1 car? It's available, bodywork is lovely but has been laid up for a while but aim to be taking it apart and rebuilding the engine and box myself. [/quote']

It's really easy chap. Once you've removed the black locking ring under the tank coverr in the boot, you can pull the whole fuel guage / pump assembly out of the tank. There's a lug on the floor of the tank which the pump housing twist-locks into. You just twist the pump housing with your hand and out it pops. It's generally nicer doing it when the tank is empty, but not essential.

Once out you take the housing apart (quite self explanatory) and slot the Walbro into the housing in place of the original bosch pump. They're pretty much the same size and shape but the Walrbo needs a little locating collar to sit it in securely. Vince sells the pump with said collar for about £95.

Don't get me wrong about external pumps, they're fine (if noisy), and a little work to fit, but if you're only aiming for 350 horse, then a Walbro 255 is the easiest and cheapest solution. Walbro make a lot of pumps for OEs, so they are reliable on the whole. The ones that fail are usually down to poor configuration on the owner's part, or running them dry and / or sucking crap into them.

OBD1 is fine for 350. I know of people with a lot more power than that running OBD1. OBD2 is much nicer, but OBD1 can do it no problem. C2 probably have software for OBD1.

nowing you're one of the smartest VRT owners on here would appreciate your advice.

Thanks :-) I'm probably the most opinionated / voiced rather than smartest ;-) There are other knowledgable folk on here but they keep to the sidelines.

[Devildub_06 0]

Kev' date=' is it a pain fitting a Walbro 255 in tank? I'm soon to be embarking on an extensive project soon involving and OBD1 VR6 Golf. While i'm at it, and not meaning to open a tin of worms with the VR6T crowd, but is it worth my while Aiming for 350bhp with an OBD1 car? It's available, bodywork is lovely but has been laid up for a while but aim to be taking it apart and rebuilding the engine and box myself. [/quote']

It's really easy chap. Once you've removed the black locking ring under the tank coverr in the boot, you can pull the whole fuel guage / pump assembly out of the tank. There's a lug on the floor of the tank which the pump housing twist-locks into. You just twist the pump housing with your hand and out it pops. It's generally nicer doing it when the tank is empty, but not essential.

Once out you take the housing apart (quite self explanatory) and slot the Walbro into the housing in place of the original bosch pump. They're pretty much the same size and shape but the Walrbo needs a little locating collar to sit it in securely. Vince sells the pump with said collar for about £95.

Don't get me wrong about external pumps, they're fine (if noisy), and a little work to fit, but if you're only aiming for 350 horse, then a Walbro 255 is the easiest and cheapest solution. Walbro make a lot of pumps for OEs, so they are reliable on the whole. The ones that fail are usually down to poor configuration on the owner's part, or running them dry and / or sucking crap into them.

OBD1 is fine for 350. I know of people with a lot more power than that running OBD1. OBD2 is much nicer, but OBD1 can do it no problem. C2 probably have software for OBD1.

nowing you're one of the smartest VRT owners on here would appreciate your advice.

Thanks :-) I'm probably the most opinionated / voiced rather than smartest ;-) There are other knowledgable folk on here but they keep to the sidelines.

Greatly appreciated, always good to hear from a "been there done that" person as I know it is then a reliable solution. I was going to go for a Bosch (when I see the damn car i'm trying to get hold of lol!!), as they're used a hell of a lot in the engine testing facility I work for, but I would rather it be neat and tidy.

I hope this info helps Antone28 who's thread I seem to have stolen (sorry :$ )

[FishWick 21]

Bosch are good pumps also. You can actually fit the ubiquitous "044" into your tank mate. It'll be a LOT quieter :-) It'll need some figuring out though, which is why most folk sling them underneath!

[Devildub_06 0]

Personally i'd prefer to retain it within the tank, the "big arse shiny look at my torpedo" fuel pump doesn't really do it for me, I aim to keep everything to a minimum underneath if poss. And I don't mind a bit of noise at all, I like to hear things working lol

[antone28 0]

Ok ,nice to hear diffrent pionts of view, ive got the c2 sofware now its running sweet, I just need to get the pump done then i can start upping the boost.runing about 8 psi at the mo, with the standard pump,out of curiosity does any one know the limits of the standard vr6 pump , ive heard they can supply enough fuel for about 10 psi ?

[FishWick 21]

IBIVR on here melted his engine running the standard pump, so I wouldn't chance it personally!

8psi is the 'safe' limit imo, for a regularly used car.

You could try the 255lh Walbro in-tank one (good for 500hp remember) to start with and in the unlikely event you exceed it's capacity, you can then sling an 044 underneath to supplement it. The two together will give you about 700hp capacity.

[antone28 0]

yeah extreme scoobys next door to me sell the in tank ones, but their much smaller than the standard, i couldent see how i was going to fit it.

[FishWick 21]

Extreme Scoobs in Essex? Been there a few times. Run by someone called "Noelsy" ?

Small world.

Yeah the pumps look small, but they do fit. They're the same size as the VW bosch ones. Don't let small size put you off :-)

[antone28 0]

yeah nolsey, i work in the vw breakers next door to them units, when i took my pump out of my car it was bigger than the walbro, are you saying there is a certain vw pump thats the same sizeas the walbro , or do you always have to use the spacer that vice talks about.

[FishWick 21]

The Walrbo is the same width as the VW one, but some are shorter, so sits higher up the tank meaning you can't go any lower than 1/4 tank. The one that is the same length as the VW one is the Cosworth spec Walbro which Vince sells (with the collar to fit it into the VW housing etc) for around £90. It's the one I use too and is essentially just a rebranded 255 as it's sold by Sytec.....but has Walbro stamped on the case!