Vince33

Hey guys, mpg is 8-10 on my Turbo2000 Impreza. Is that normal for a city driving? I thought it was more like 20 mpg.
Where could be the problem? What is your imprezas consumption?

bugeyejohn

iTrader: (11)

Sounds thirsty as hell to me,but my mates classic only does 15mpg with similar driving and of boost most of the time,and hes doing a fault code check to see if theres a problem

Vince33

My car only has prodrive exhaust..

Mrchips

iTrader: (7)

I don't know how to work out my mpg, bit I get 240 miles per full tank

greendragonkungfu

8-10 sounds shocking for a standard car. i get 24-28 mpg from my 95 import(standard 260 ps, no mods) or about 240-270 to a tank(50ltr)


http://www.torquecars.com/tools/uk-mpg-calculator.php

P600wrx

iTrader: (1)

my car i shocking too, i had half a tank and did 90 mile!!!!!!!!!!!! although 50 of it was motorway and rather a quick drive, but still

musso2010

ive spent 50 quid on fuel this week so far, and need to fill up again this morning.

lordharding

iTrader: (1)

A full tank for £73-£75 now gives me 250 miles and has been that for ten years

That includes a 10 mile blast to work Inc city driving

karl_1986

i get about 240/250 mile to a full tank this includes 40% motorway off boost 60% city driving, if i do 100% city driving then it goes down to about 190 mile to a full tank

bugeyejohn

iTrader: (11)

According to that 24.5 mpg for mine

Aztec Performance Ltd

iTrader: (234)

A faulty lambda sensor would result in excessive fuel consumption off boost.

http://www.superhids.co.uk/lambda_se...u_impreza.html

Vince33

Thats a bit higher than mine. I should be doing maximum 15 mpg which is normal, i will check my lambda sensor

bugeyejohn

iTrader: (11)

Cant you read the faults using a bulb

greendragonkungfu

and iv done 20k this last 12 mths. 6k in fuel.

scooby800

iTrader: (1)

cheers mate youv just made me ill lol

im going down to VW tomorow to get a polo bluemotion...............hahaha yea right

bugeyejohn

iTrader: (11)

Ouch dont know if i could handle that if fact after tax i dont earn much more lol

Vince33

Whats that?

bugeyejohn

iTrader: (11)

I think on classics you use a 12v bulb and plug it to a couple of wires under the dash,you then see how many times it flashes and that tells you the fault,i think theres a thread on it in the search

JdcTypeR

iTrader: (19)

Look under your dash on the drivers side you should see two green and two black connectors, (they maybe taped up) and then follow this guide


http://www.jollygreenmonster.com/ecu.asp.htm

bugeyejohn

iTrader: (11)

Ah cunning thats how its done

JdcTypeR

iTrader: (19)

Yes mate

Vince33

Im gonna try it and i will post a reply

chiroman

iTrader: (1)

for MPG work out miles per litre and divide by 0.22 = MPG

The first mapper to come up with a good reliable economy map will make a killing.
My std WR1 managed 29mpg when driven on motorway and off boost, did it for a week to see what it could achieve, it was hell. Normally 21ish on motorway but easily drops to 16 mpg or less running around and on 'B' roads.

I find it hard to believe in these days of modern technology the car doesn't lean out the AFR etc on steady runs for higher mpg on part boost at say 80mph and still be able to respond quickly to protect the engine when you accelerate. Is the ECU/mapping system just too crude?

As I understand it the ECU is constantly monitoring and updating itself to provide max ign advance/AFR etc but only within the boundaries allowed by its 'generic map'. So even if you don't manually reset it it will learn the best configuration for your driving style. Can you have your cake and eat it with a remap ie better economy cruising and good power when booting it?

Vince33

Errors-none???

http://www.youtube.com/watch?v=aLPE0d98s-8

What do you think

JdcTypeR

iTrader: (19)

Ok then. A lazy 0xygen sensor can cause higher fuel consumption without creating a fault as its still giving a reading. Hows it driving? Any hesitation on light throttle upto 3000rpm?

Vince33

oh yeah, actually i get something like that on 2nd gear, its some sort of hesitation on about 2400-2500rpms. but i didnt thought that could be a problem, it appears it is. man, your good! so what now?

JdcTypeR

iTrader: (19)

are you at a cruising speed when it occurs? is it a slight hesitation or more of a misfire?

Vince33

While im driving normally and when im going to accelerate on 2nd , at this 2500 rpms i get a "pause" just for a sec. It doesnt accelerate for a second. I've seen this only on 2nd gear. More like a hesitation

Vince33

hey lads should i try with that? can i get a lambda sensor from anywhere else cheaper?

btw. could that be a maf sensor related problem also?

Vince33

hey lads which oxygen sensor exactly do i need, this on the manifold or the other one on the exhaust?