rentonone

iTrader: (1)

i had a tek 3 done on my my00 turbo couple of weeks back but my walbro fuel pump didnt come in time. if i fit it now will i have to take it back to be tuned again or will it be ok? thanks

RoRu

As long as you don't adjust the fuel pressure in any way you should be ok.

Are you using a std fuel reg or an adjustable one?

rentonone

iTrader: (1)

ive got standard regulator mate. just wanted to fit the walbro as a safety after the remap. thanks

Dspeed

Maybe? Did they alow for it when the map was done?
Ring the peeps who did the map n ask?
Similar thread.
http://bbs.scoobynet.co.uk/showthread.php?t=480086

serega

Yes you will need to remap again

RoRu

So why will he need to have a remap???

He is still using a std fuel reg, so no matter what pressure the pump is pumping at the reg is maintaining a stable regulated pressure that the car has been mapped for.

Bob Rawle

Undfortunately whichever reg you keep to fitting an uprated fuel pump will cause the car to be fueled more heavily, there is no real point fitting an aftermarket one as the FSE (cheapish) is not a reliable component and the SX (good alternate) is a touch expensive, the factory reg does just fine for most std engined cars, the uprated pump can supply more fuel flow for any given pressure within the flow limits of the regulator which is why a remap is recommended.

bob

RoRu

Bob could you explain this a bit more? the way i see it and I'm not saying that I'm right, but if the fuel line size has remained the same and the reg is also the same as was on the car when it was mapped the new pump although able to flow more fuel surly is governed by what the reg and to a certain extent the fuel line will let it flow??

Or am I way off the mark??

Bob Rawle

Reg governs pressure, you could have the same pressure and no flow if the pump was weak enough and the reg shut, the more powerful pump will flow more fuel into the same pressure head. So reg only trys to control pressure, the pumpo capacity controls how much flow at that pressure.

bob

RoRu

I see, thanks Bob.

Trap2Terrorist

iTrader: (3)

I've recently had a Walbro 255 fitted in prep for my ecutek remap. Since the remap my bugeye WRX is using WAY more fuel than before. I appreciate that this will be partly to do with my heavier right foot but even normal motorway driving at 75mph seems to be returning ~24mpg's compared to the previous ~31mpg's.

Will fitting a new fuel regulator help to address the increase in fuel consumption or is it a case of "that's the price you pay for more bhp and torque"?

Thanks.

Trap2Terrorist

iTrader: (3)

Anyone?

Ben v7

That seems a touch strange to me. A remapped car should be more efficient on cruise. Could it be using more fuel because at 75mph it wasn't boosting previously, whereas now it is?

I don't think a new regulator will make any difference. Could be over fueling slightly at low revs. But if it was running seriously rich you would know about it as performance would take a hit.

Trap2Terrorist

iTrader: (3)

When I had it looked at again recently one of the throttle map parameters was changed to increase the amount of throttle required before the ecu starts chucking in more fuel, etc (from 20% to 30%).

I guess you could be right about the boost point. I used to sit a just under 3k rpm's (~76mph) because I noticed a big increase in fuel usage at 3k rpm's and over. When I had it remapped he did say he'd managed to bring the boost in earlier - maybe I haven't appreciated the effect this would have on fuel economy...

I'm not sure I can handle driving at 70mph on the motorway though!!!!

I might try keeping it under 2.5k rpm's for a while to test the mpg return.

Thanks.

edit: although saying that, it does use a lot more fuel on my 8 mile journey to work and I hardly get over 40mph all the way. Hmmmmmmm.

rgv_stu

so whats the gist with a standard car and wanting to uprate the pump ??
does it need a remap ??

Normski

I take it you don't have a boost gauge fitted, because you would see that when you are cruising at 75mph, 85mph, 95mph etc, your engine is operating under vacuum (negative boost) even though the revs are above the point at which your turbo CAN produce boost.

If the reduced fuel economy isn't down to you using more of the cars performance (the more power your car makes--the more petrol it needs), then it's been remapped to be richer.

Trap2Terrorist

iTrader: (3)

I'm in the process of buying a boost guage as part of the GB on here