How Big Is Too Big?

[GTS4dood]

Morning All,

Is there any negative affects of getting a bigger fuel pump than a bosch 040?? I've gone with the 023 which is apparently the big brother of the 040 (good for 800hp...when i get there hehe). The reason i ask is that i just did a 100k service on wknd + adjustable cams (the tuners kit through kudos). I put in the 023 fuel pump and when i took it for a spin as soon as it hits boost it starts spluttering. I also made the bracket drop about 1-2cm max so it would fit, could it be its too low in the tank now and struggling to suck the juice??? need help?

Edited January 21, 2008 by GTS4dood

[r33cruiser]

u still have stock ecu man?

and how much boost were u runnin?

[paulr33]

you can have a fuel pump thats too big

what happens is when you are sitting in traffic the pump keeps pushing fuel up to the rail

and then back down to the tank and keeps going around, it just heats the fuel up a bit

i dont think it would cause the problems your describing

[Gts-t]

Try raising the pump up a little, if it is very close to the tank floor it could cause those symptoms

gl

[rev210]

too big?

[R34GTFOUR]

^^^ lol

my younger bro has a 023 in his r33, works fine. The tank is an odd shape and you have to make sure you put the pump in the exact same position as the stock pump otherwise it will have trouble picking up, especially when your low on fuel.

We just modified the stock braket, which was very basic and just used big hose clamps to hold it on, but the side of the tank where the pump goes is very deep so just make sure you have the pump at the right height. Use a long metal ruler, or something along those lines to measure how deep it is to the bottom and use that info to properly install the pump.

[GTS4dood]

u still have stock ecu man?

and how much boost were u runnin?

I have a Power FC which i plugged in. its the RB20 version (AP engineering) so it already has a basic map programmed as far as i'm aware but i havent tuned it yet. I also have an EBC but not on til next wknd as ran out of time so still running stock boost. I havent put in the fuel pressure regulator as i'm still waiting on a bigger turbo to arrive but i dont think that would cause any problems.

[dmr]

best bet is to chuck it on the dyno

[bumble_bee]

so wat is the difference between 040 and the 023?

[dmac_25]

so wat is the difference between 040 and the 023?

023 is basicly the same as 044 but internal.

Get it on the dyno and tune it and maybe lift it up as discussed

[boosted_32]

I think this may be the answer to my question I need a pump that will safly run between 320-350kw I was asking if the 040 would do the job but no one really answerd my question one dude said he was running a 040 which maxed out at 280kw. would the 023 be the better one or would it be to big? cheers

[W1ngnut]

I just installed an 023 Bosch in my Subaru Liberty RS and found that i had to get the Fuel Regulator adjusted because it flowed at a lower pressure than the Walbro i had in. Took it to my tuner and he upped the FPR and its perfect again.