why is the VR4's mapping so s**t?

[psbarham]

Why did mitsubishi feel the need to make the mapping so crap on the vr4?

for example why is there a 10mpg difference between 4th and 5th at the same rpm and throttle position with 5th being the winner on fuel?????

also why is it they felt the need to add 60% more fuel for a 10% increase in revs?

oh and for those that are using the wideband to lean their car out, don't the car uses more fuel at 16:1 cruise than at 15.3.

fecking thing is pissing me off now to the point that autotrader has become a daily read.

[swinks]

You shouldn't fit UTCOM methinks...

[Wodjno]

So whats your average MPG Paul ?

[foxdie]

You could try advancing the timing just a little around the cruise points for a bit more fuel economy perhaps?

[psbarham]

You could try advancing the timing just a little around the cruise points for a bit more fuel economy perhaps?

not gonna stop the ecu dumping **** loads of fuel in when the throttles moved 3 or 4 %

its either piggy back or remap time. or just say fvck it and flog the fvcker.

Wodg, the average is 28.4 with soley local journeys, but driving like miss daisy.

[foxdie]

the average is 28.4 with soley local journeys

Lucky, I don't even get that

[Ghost_2008]

I get no where near 28 mpg, on a long journey cruising I have achieved such a dizzying height but usually I must get about 15 mpg, local journey's with lots of speed humps and traffic lights..... you gotta love London......

[psbarham]

Lucky, I don't even get that

thats with doing 4 mile each way at 40-45 and 15% throttle

[scott.mohekey]

I think what you're referring to is acceleration enrichment. From memory, it's discussed on a US website dedicated to the Mitsi GTO. Something along the lines of firing all injectors at once during acceleration. http://www.stealth316.com/2-fuelinjection.htm

[VR457]

thats with doing 4 mile each way at 40-45 and 15% throttle

You can walk that. And its really economical.

[Wodjno]

not gonna stop the ecu dumping **** loads of fuel in when the throttles moved 3 or 4 %

its either piggy back or remap time. or just say fvck it and flog the fvcker.

Wodg, the average is 28.4 with soley local journeys, but driving like miss daisy.

Well i would class your local as a nearer Combined than Urban driving. With real world MPG figures, they are bloody good dude.. I average 23mpg with local driving, but now always driving like Miss Daisy..
Take a look at some real world MPG figures for Modern 2.0 upwards petrol engines.. You will be suprised at what u see

[Wodjno]

thats with doing 4 mile each way at 40-45 and 15% throttle

And i bet they are mostly from cold journeys ?

MPG figures you see in Car Mags are not based on 4 miles at a time from cold!!

[horndog]

the average is 28.4 with soley local journeys, but driving like miss daisy.

The trip computer on my 2.0t Saab 9-5 shows ave. mpg of 23 with similar journeys. Wife uses it for shopping/taking kids out etcso not getting too much stick.

[Wodjno]

The Below figures are Manufacturers figures.. I can't find the site with the real world figures I found a few sites but not the one i've been on a few times before and was gobsmacked by the results of cars with half the bhp and less than 2.0 cars

Saab 9-5 My2006 5 Door Estate 2.0 Lpt With Tuning Kit Petrol 1985cc Manual 5 Speed
Urban: 20.8 MPG
Extra Urban: 40.4 MPG
Combined: 30.1 MPG

Honda Accord 06 Tourer 2.0 I-vtec Se Petrol 1998cc Manual 5 Speed
Urban: 28 MPG
Extra Urban: 47.9 MPG
Combined: 38.2 MPG

Citroen C6 3.0i V6 Petrol 2946cc A6
Urban: 19.2 MPG
Extra Urban: 39.2 MPG
Combined: 28.2 MPG

Bmw 5 Series E60/e61 525i Touring 2996cc Manual 6 Speed
Urban: 26.2 MPG
Extra Urban: 47.9 MPG
Combined: 36.7 MPG

Lexus Is Is250 Saloon Petrol 2500cc Manual 6 Speed
Urban: 20.9 MPG
Extra Urban: 36.7 MPG
Combined: 28.8 MPG

Mercedes-benz E-class Estate (s211) E280 225 Tyres At Rear Petrol 2997cc A7
Urban: 20.5 MPG
Extra Urban: 38.7 MPG
Combined: 29.1 MPG

Jaguar Cars X Type 2.5l Saloon Petrol 2497cc A5
Urban: 18.9 MPG
Extra Urban: 37.3 MPG
Combined: 27.5 MPG

Jaguar Cars S Type 3.0l Saloon Petrol 2967cc A5
Urban: 18.7 MPG
Extra Urban: 36.4 MPG
Combined: 26.9 MPG

Porsche Cayman 5-speed 2687cc Manual 5 Speed
Urban: 20.5 MPG
Extra Urban: 41.5 MPG
Combined: 30.4 MPG


Skoda Octavia Estate (>2006) Vrs 2.0t Fsi 200bhp 1984cc Manual 6 Speed
Urban: 25.9 MPG
Extra Urban: 45.6 MPG
Combined: 35.8 MPG

[Danzul]

dont get dishaertened bud!
lets face it, your leggy will upset pretty much all of those listed above by wodge and your mpg is better than some of them.

[Adam.Findlay]

I think what you're referring to is acceleration enrichment. From memory, it's discussed on a US website dedicated to the Mitsi GTO. Something along the lines of firing all injectors at once during acceleration. http://www.stealth316.com/2-fuelinjection.htm

pretty sure thats right, our cars do go from sequential injection to batch fire on accleration

[Wodjno]

I think what you're referring to is acceleration enrichment. From memory, it's discussed on a US website dedicated to the Mitsi GTO. Something along the lines of firing all injectors at once during acceleration. http://www.stealth316.com/2-fuelinjection.htm

So thats what the Acceleration Adjustment Map on the E-manage Ultimate is for

Feck i coulda saved myself some serious amount of fuel over the years

So next job ..

Acceleration Adjustment Map
-100% fuel 0 - 8000rpm and 0-100% throttle

[pezza]

The only little relief I can get is paying half price for the fuel with lpg...

That acceleration adjustment sounds interesting ..hmm..

[scc]

Is it just bad mapping or is it simply impossible no matter how optimised your map is?
Or is it just that the ecu has a contract with OPEC?

Cheers
Scc

[scott.mohekey]

It errs on the side of caution, preferring to run rich rather than lean to reduce the chance of knock.