DIS mpg reading - making it accurate

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Dippy
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DIS mpg reading - making it accurate

Post by Dippy » Thu Nov 11, 2004 1:43 pm

1) Monitor and record your average real and displayed mpg. This might take a few tankfuls depending on your driving.

2) Calculate the average discrepancy as a percentage.

Discrepancy = average DIS mpg x 100
--------------------
average real mpg

3) Round this figure to the nearest 5

4) Adapt (function 10) channel 03 of the instrument cluster (address 17) to this figure.

My average discrepancy was 108% so I adapted to 110. Current average discrepancy is now 101%.
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Golich
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Post by Golich » Thu Dec 09, 2004 8:03 pm

Top tip Dippy :thumbs:
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jeffw
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Post by jeffw » Fri Dec 10, 2004 7:23 am

Someone needs to get out more...... :biggrin2:
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ChrisG
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Post by ChrisG » Fri Dec 10, 2004 1:38 pm

this is what happens when you have two small children !!
As usual a real techie post from Dave !
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CliveH
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Post by CliveH » Mon Jun 19, 2006 3:10 pm

Very interesting and informative Dippy, thanks. (In case anyone's wondering why there was such a delayed reaction on my part, it's just been cross-referenced in another post!)

In order to get actual average mpg, miles driven is easy enough (as long as you remember to reset the counter of course), but gallons consumed is the tricky bit - obviously full tank to full tank, but how much is consumed from tank to tank? I struggle to get 55 litres in mine (on "empty" 0 miles tank, running on fumes) whereas the spec says the tank holds 62 litres...
Clive

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david7m
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Post by david7m » Mon Jun 19, 2006 3:29 pm

I have no idea what so ever you are talking about - but sounds great anyway :)

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Dippy
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Post by Dippy » Tue Jun 20, 2006 1:21 pm

Clive, you just need to record your mileage between fills and how much you fill up with. So for example:

Range - refill - real mpl - real mpg - DIS mpg - discrepancy
300 miles - 55 litres - 5.46 - 24.82 - 26.9 - 108%
280 miles - 53 litres - 5.28 - 24.00 - 25.7 - 107%
285 miles - 50 litres - 5.70 - 25.91 - 27.8 - 107%
300 miles - 59 litres - 5.08 - 23.12 - 24.5 - 106%
295 miles - 56 litres - 5.27 - 23.96 - 25.0 - 104%

The average discrepancy for this is 106% so the best adaption value would be 105
2001 Silver S4 Avant
AmD remap, APR R1 DVs, APR bipipe, Full Miltek exhaust
H&R coilovers, AWE DTS, Porsche front brakes, Short-shifter, 18" RS4 replicas
Defi-HUD boost gauge / turbo-timer (with afterrun pump modification), Phatbox
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KayGee
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Post by KayGee » Tue Jun 20, 2006 1:48 pm

Great post Dippy now if Mihnea hadn't got mine spot on when he did my remap I might actually have a use for it.
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CliveH
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Post by CliveH » Tue Jun 20, 2006 1:52 pm

Thanks Dippy, I knew you'd put me right :thumbs:

Now, I have a related question...oops, better start a new thread...
Clive

S2 ABY coupe, S4 B5 saloon, S4 B6 avant
RS4 B7 phantom black saloon, mint, fully loaded, low mileage - FOR SALE!- http://www.rs246.com/index.php?name=PNp ... ic&t=88981
S8 D2 facelift, RS6 C5 saloon, both gone but not forgotten
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CliveH
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Post by CliveH » Tue Jun 20, 2006 3:32 pm

I put it here... http://www.rs246.com/index.php?name=PNp ... highlight=
Clive

S2 ABY coupe, S4 B5 saloon, S4 B6 avant
RS4 B7 phantom black saloon, mint, fully loaded, low mileage - FOR SALE!- http://www.rs246.com/index.php?name=PNp ... ic&t=88981
S8 D2 facelift, RS6 C5 saloon, both gone but not forgotten
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