Fuel Consumption Worries

Fri Oct 10, 2008 10:15 am

Im only getting around 50 miles with £20 worth of fuel (£1.10 per litre) ??

Thats around 10 mile per the gallon in my 2.7?

Im currenlty using a 2.5bar fpr, which needs to be changed to a 3ar.

What/where should i be looking to get this sorted or is this what is expected???

Fri Oct 10, 2008 10:20 am

That's certainly not what you should be expecting. Should be high 20s or more, not 12MPG!
What engine setup is it, & what management are you running?

Fri Oct 10, 2008 10:21 am

Just sell it mate thats the best option

Fri Oct 10, 2008 10:47 am

Ziggy wrote:That's certainly not what you should be expecting. Should be high 20s or more, not 12MPG!
What engine setup is it, & what management are you running?

The engine was from a genuine Hartge H27, I didnt do anything else to it (internaly).

Also running the original ECU

Fri Oct 10, 2008 10:52 am

You have to be a bit of a cheapskate to use a 2.5bar fpr on an engine like this

10mpg is truly awful, are you sure you don't have a quite sizeable fuel leak?

Fri Oct 10, 2008 11:01 am

Theo325 wrote:You have to be a bit of a cheapskate to use a 2.5bar fpr on an engine like this

10mpg is truly awful, are you sure you don't have a quite sizeable fuel leak?

The engine came with one of thjose FSE boost valves which i took off straight away and replaced it with what i had on my B20.

I have been meaning to change this to a 3 bar.

Fuel tank is standard?

Fri Oct 10, 2008 11:11 am

Its a 5 minute jpb to replace the fpr so why not use your time to do that rather than waste it typing out about a problem that won't go away until the engine is running the correct components

Fri Oct 10, 2008 11:13 am

Have you checked for fuel leaks? Start the car up and let it idle and have a good look round the engine bay where the fuel hose connections are. Also check round the fuel tank where there are any fuel connections.

I suppose the fuel consumption is never going to be great living in West London as there's so much stopping and starting and it changes in engine load which increase fuel consumption.

BTW, if you need an 3bar FPR, I have one which you can have for £13 posted.

Fri Oct 10, 2008 11:27 am

Theo325 wrote:Have you checked for fuel leaks? Start the car up and let it idle and have a good look round the engine bay where the fuel hose connections are. Also check round the fuel tank where there are any fuel connections.

I suppose the fuel consumption is never going to be great living in West London as there's so much stopping and starting and it changes in engine load which increase fuel consumption.

BTW, if you need an 3bar FPR, I have one which you can have for £13 posted.

There is a brand new fuel tank and fuel hoses on the car which was done a month ago for MOT

running a 2.5 bar fpr wouldnt cause it to consume more fuel would it?

Paypal cool?

Fri Oct 10, 2008 11:41 am

I wouldn't have thought that the 2.5bar FPR would lead to increased fuel consumption, but it will definitely want changing.

Fri Oct 10, 2008 12:17 pm

SPADGE wrote:Its a 5 minute jpb to replace the fpr so why not use your time to do that rather than waste it typing out about a problem that won't go away until the engine is running the correct components

he is a time waster and a cheapskate always on the zone asking silly questions

Fri Oct 10, 2008 12:38 pm

me being on the zone .... the car has come a long way!

By you writeing comments like that isnt wasting time and silly?

Dont let me start on the butcher jokes now sunny!

Fri Oct 10, 2008 1:13 pm

Mon Oct 13, 2008 9:20 am

Guys,

After thinking about this over the weekend....

Could it be the gearbox that Im running?

The gearbox was left standard (320i) and the final drive is 3.91lsd?

I checked for any fuel leaks and could see any thing obvisous?

Mon Oct 13, 2008 9:24 am

Doubt it's the gearbox. The gearbox ratos and the diff ratios are what came on the Tech 2 Sports.

Although I would expect the gear box to shit itself if your putting 2.7 torque through it.

Mon Oct 13, 2008 9:25 am

The gearing you have wouldn't make it that bad on fuel no.
It'll either be running too rich or has a leak or both.

Mon Oct 13, 2008 9:41 am

SPADGE wrote:The gearing you have wouldn't make it that bad on fuel no.
It'll either be running too rich or has a leak or both.

what can cuase a engine to run rich? injectors?

When i ran the engine in i could smell alot of unburnt fuel but now it seems ok?

When i had the car MOT the guy was saying that the hyrdo carbons were high.

Mon Oct 13, 2008 9:55 am

SilverShadow wrote:
SPADGE wrote:The gearing you have wouldn't make it that bad on fuel no.
It'll either be running too rich or has a leak or both.

what can cuase a engine to run rich? injectors?

When i ran the engine in i could smell alot of unburnt fuel but now it seems ok?

When i had the car MOT the guy was saying that the hyrdo carbons were high.

A lot of things can cause an engine to run rich

Dodgy sensors, dodgy afm, throttle position sensor, ecu, map etc etc.......

High hydro carbons arn't a good sign.

Mon Oct 13, 2008 10:20 am

Temperature sensor?

Mon Oct 13, 2008 10:39 am

TheDutch wrote:Temperature sensor?

A good starting point as if the engine things its always cold it'll over fuel it accordingly.

Mon Oct 13, 2008 10:42 am

When i first start the car, the engine doesnt hold its rev and cut out so i have to press the the accelerator to warm it up.

but once the engine is warm the temp needle is in the middle.

Mon Oct 13, 2008 10:45 am

SilverShadow wrote:When i first start the car, the engine doesnt hold its rev and cut out so i have to press the the accelerator to warm it up.

but once the engine is warm the temp needle is in the middle.

Will it idle when cold with the iscv un-plugged?

Mon Oct 13, 2008 10:49 am

Check the blue temperature sensor. Easy to test, and one of the main causes of over fueling.
Check for air leaks.
Lastly a knackered Air Flow Meter.

Consider an aftermarket ECU with wideband sensor.

Mon Oct 13, 2008 10:52 am

Boys i will check for these: icv, blue temp sensor

How is the best was to test the blue sensor?

Mon Oct 13, 2008 6:16 pm

Just sell it mate thats the best option

wouldnt do that at the mo...

Fri Oct 17, 2008 6:34 pm

SPADGE wrote:Will it idle when cold with the iscv un-plugged?

Just checked this, pulled the plug off the icv and started the engine and it idle'd.

Have i got a knckerd icv?

Fri Oct 17, 2008 10:54 pm

forgot to add the it did run a bit rough when i pulled the plug..

Sun Oct 19, 2008 12:06 am

anyone?

Sun Oct 19, 2008 8:02 am

SilverShadow wrote:Im only getting around 50 miles with £20 worth of fuel

Not exact science, that, is it?

Check the fuel consumption properly before you make assumptions like that.

Sun Oct 19, 2008 12:18 pm

tbh i havent really noticed any difference when i put on the 3bar fpr...

Thu Oct 23, 2008 2:13 pm

Guys

I changed the FPR over the weekend to a 3 bar and today I got 70miles from £20 (at £1.10 per litre), driving it a bit hard.

Runs much nicer and does not feel hesitant at all now!

Well happy!

Thu Oct 23, 2008 3:21 pm

e30bmlover wrote:tbh i havent really noticed any difference when i put on the 3bar fpr...

I've seen a massive difference! feels more smooth and free flow?

with the 3 bar Ive worked out that Im bnow getting 16mpg still not that great but better then 10!

Thu Oct 23, 2008 7:27 pm

resitance 200-300ohms when hot