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Digital Speedo for the Leon Cupra ?

LEE69

Stage 2 Revo'd
Dec 10, 2004
21,262
74
C\UK\Devon\Torquay
Still having an issue with accuracy with miles left to tank empty, but i'm hoping once i have filled the tank 2 or 3 times then the accuracy will knit in.

This is what the manual says

In order for the TANK information to be useful, you must set the size of
the fuel tank using MORE>SETUP>FUEL>TANK SIZE. When you
fill-up, you must use HOME>MORE>FILLUP>DONE to indicate the
vehicle tank has been refilled. It is also necessary to fill the tank to make
the TO EMPTY information correct.
The estimate of distance and time to empty is based on the economy that
has been obtained so far on this tank of fuel. Right after refueling, these
values will change fairly quickly. As more of the fuel has been burned
from the tank the readings will stabilize.
It is possible to see the distance and time to empty increase as you drive.
The distance can increase as you drive at a steady fuel efficient speed.
This causes the fuel economy for the tank to rise and applying this
higher fuel efficiency to the fuel remaining in the tank can actually result
in more remaining distance. If you drive slower than the average speed
of the tank so far, the time to empty can increase.
You should refill the vehicle when there is above 50 miles/km
remaining. Pushing below 50 could result in running out of fuel.
Pressing the lower left button again will return the selection to the
CURRENT trip. Continuing to press it will cycle the trips from one to
the next. TANK shows different types of information in some cases from
the other trips. TANK substitutes TO EMPTY data in place of
MAXIMUM data.

Be good if the scanguage took the reading from the fuel level sender too, then it would know when it was filled up.
 

andy15star

Full Member
Apr 17, 2005
825
0
Durham
Exactly what i was thinking !

Wouldn't you think that ScanGauge could get the same readings from wherever the on-board trip computer gets it from ?. The trip counter seems to know how much fuel is left everytime without having to tell it when we filled up and with how much fuel, so can't the ScanGauge ?.

hmmm

Regards,
Andy
 

xd-data-ii

Active Member
Mar 15, 2007
375
0
San Diego
My scangauge still hasnt arrive damn it.

Andy, how you getting on with it?
Did you try adding in the xgauge for boost in the link i previously posted on the TDI forum?
 

andy15star

Full Member
Apr 17, 2005
825
0
Durham
Hi all,

It's a pretty cool piece of kit ! - i think the "miles left in tank" is getting more accurate now that i've had a couple of tank fills ! - mph seems very accurate, as does most of the other settings. Not too bothered anyway about the miles left in tank as i can get that from the trip computer in the car !

All in all, worth every penny i would say !

Xd, when you say the gauge can show boost - how exactly would i do this ?? - i have some xgauges set up in the scan screen for "miles done this trip", "miles done today", etc, but i cannot see how to do boost ???. If you can let me know then i'll give it a go.

Cheers,
Andy
 

andy15star

Full Member
Apr 17, 2005
825
0
Durham
Hello!

I've tried the "HP" on the ScanGauge and it seems to work, although i could only get it up to 128HP (the car is 180bhp), so not quite sure how it works. Maybe the gear i'm in makes a difference ? (It probably does on thinking about it !)

Anyone know of anymore codes to use with the ScanGauge to get a few more tweaks on the ScanGauge's XGauge facility ?

Best Regards,
Andy
 

xd-data-ii

Active Member
Mar 15, 2007
375
0
San Diego
hey,

Got the scangauge yesterday and have fitted it and set it up. Have to fill the tank today and to start the fuel calibrations.

I setup the horsepower reading too. In a quick spin last night saw it hit 218 so pretty pleased with that. Dunno why you got only 128 and shouldnt matter what gear. your peak bhp should be around 5000rpm in all gears. Using higher will allow more time for it to be read though.

I have issues maybe we could work through

1. I want a torque reading. BHP is always calculated by torque and rpm so the scangauge maths function for the hp might be using torque and a formula to calculate the hp. think ill try a new xgauge without the maths section and see what it is.

2. Car manual says 55 litre tank. If you enter this in litres in the scangauge and then change to gallons it doesnt convert it ie.then 55 gallons. But i think it is US gallons, no mention of UK gallons. So 1 gallon (us) = 3.785 litres where as 1 gallon (uk) = 4.56 litres. So tank size is then 14.52 gallons - entered as 14 gallons in scangauge. So the MPG readings will be based on US gallons and not UK gallons and correspond the same as the MPG readings in your car.

2. I want speed in km/h (we have kilometers here). I want fuel economy in MPG. But if i set it up for Km and gallons i can only have KmPG fuel readings and if set for miles and litres can only have Miles per Litre and if set for Km and Litres can only have Litres/100Km. I prefer miles per gallon.
Maybe there is some xgauges that can be created to do this. Leave it as miles and gallons and set up xgauges to recalulate for UK gallons and recalulate speed for Km/h. Will have to look into this one.

Couldnt get the boost one working. will have to look into this too.

I tried it on top of the steering column and found myself having to sit up a bit to read it fully and then when i turned the steering wheel couldnt see it. I finally settled on the much better position of on top far right of the dash tucked in at the bottom of the A pillar.
 

LEE69

Stage 2 Revo'd
Dec 10, 2004
21,262
74
C\UK\Devon\Torquay
You sod mine should have been here by now but a fire in daventrys posts office (they only got one?) meant it won't be posted till today.

I think mines going where you have yours, the mirror mounts doesn't look suitable as the mirror is to close to the roof.
 

andy15star

Full Member
Apr 17, 2005
825
0
Durham
Hi,

I had the same problem as you xd with mounting it on the steering rack. Luckily i am tall, so it doesn't cause a problem that way, but when turning i cannot see it !

Can you confirm the US gallons thing ??, this might be why mine shows i get 27mpg, when the car trip computer shows 32 to 33 !!!

I'm going to email my man at ScanGauge in the USA for clarification on the US gallons/UK gallons, and see what he says !

I'll post back with his reply !

Regards,
Andy
 

xd-data-ii

Active Member
Mar 15, 2007
375
0
San Diego
Looking into this more Scangauge FAQ says
"If you use Imperial Gallons when you do the calibration, fuel will then be adjusted to use Imperial Gallons. "

So i guess if you enter the tank size for calibration to Imperial gallons then it will be fine.
1 US gallon = 3.79 Litres
1 Imperial Gallon = 4.55 litres
So in contradiction to what i said above:
55 litre tanks = 12 gallons entered into scangauge.

I just did my first fillup and had 14 gallons entered. Might just change the tank size to 12 gallons and use the adjustment at the next fillup to change the difference.

So thats got me the right MPG. Now i want km/h for the speed and want to display torque
Could make an x gauge for km/h using maths function. Will email scangauge people to see how to set this up.
Same for torque.

I also made the average MPG appear as a gauge using xgauge. See manual for this.
 

xd-data-ii

Active Member
Mar 15, 2007
375
0
San Diego
XGauge settings for MAF Reading:
TXD: 686AF10110
RXF: 044145100000
RXD: 2810
MTH: 000100010000

Think this is reading in g/s - mine is around 2g/s at idle. Not fully sure if this is right.
 
Roadpilot Micro Go thats what you want gives you a digital speed read out witch is very accurate which is more than can be said for the speedos in the leon they tend to be slightly out, The Roadpilot is also a camera location notification device which is exellent i have one its ace! http://www.roadpilot.com/MicroGo.asp

Although this image does not show it the speedo can be displayed on full screen in big numbers only when a warning flashes up does it go to the screen shown!
 

andy15star

Full Member
Apr 17, 2005
825
0
Durham
The roadpilot looks good, but for a bit more price it doesn't seem to do all the other things ScanGauge does though (mpg, maf, miles to empty, fuel used, fuel remaining etc etc).

So from the info, xd, i set mine up as a 12 gallon tank. When i fill up, i input it in UK gallons filled up with, i set the engine size to 1.8 litres, does all this look okay for UK settings (as opposed to US settings) ?

I still cannot for the life of me get the mpg right !!! - it still shows around 27 mpg wne my in-car gauge says 32 !!. Mind you, i'm only at stage 1 of the calibration process (where you fill the tank and do "more - more - fill up - done") - I have yet to leave the tank to drop to quarter a tank and fill to the brim then do "more - more - fill up - enter amount of fuel filled up with- done", so that second step (when i do it) might bring the accuracy up a bit ????

Incidentally, incase anyone has the ScanGauge, what the guy said we had to do on initial calibration was:

1) Install ScanGaugeII, type in engine size and fuel tank size
2) Fill tank until petrol pump auto-shuts off
3) On the ScanGaugeII do "More - More - Fill up - done" - do NOT enter fuel data yet
4) Drive until the tank is around the quarter mark (1/4 tank of fuel remaining)
5) Fill tank until petrol pump auto-shuts off
6) Same as step 3, but this time do "More - More - Fill up - enter amount of gallons you just put in - enter price (IS THIS THE PRICE YOU'VE JUST PAID, OR PRICE PER GALLON ???? - done"

He tells me the accuracy should be much better then !

Regards,
Andy
 

xd-data-ii

Active Member
Mar 15, 2007
375
0
San Diego
Its the price per gallon. So multiple the cost per litre by 4.55 and thats the cost you set it as.
Your settings look good.

The cars on-board computer (which i dont have) are apparently notorious for being very inaccurate.
You should do a manual calculation. Ignore the cars one.
How many miles for how many litres of fuel are you getting?
I track it through a spreadsheet. I just filled up around 49 litres after 280 miles which give me 25.6 MPG.

I wont bother with relying on the scangauge one until my second fillup. But i will know what it should be
 

andy15star

Full Member
Apr 17, 2005
825
0
Durham
Hi xd, Cheers for the info, much appreciated!, i'm due the second fill up in the next week or so, so i'll do that then.

I've always relied on the trip computer for my average mpg (roughly 31 to 32 mpg), i've never done it manually, but it does sound a good idea to try that. I set the trip clock to zero when i filled up, and i put 55 litres in (well, the tank was filled until the pump auto-switched off anyway).

You know your MAF setting for the ScanGauge?, well i've entered all the information and it seems to work perfect. I get around 3 to 4 at idle. But (pardon my ignorance!!), what exactly does this measure ?

Do you have anymore xgauges for the ScanGauge ?, i have the bog standard miles done today, miles done this journey, BHP etc.

Best Regards,
Andy
 

xd-data-ii

Active Member
Mar 15, 2007
375
0
San Diego
Its grams per second. Not sure at all the significance of this is but will search for it. Its to do with what the ecu is sensing via the MAF sensor and is a measure of air flow and is used for control air to fuel mixture. So i guess erratic readings from the sensor shows a faulty MAF and you would see issued with the car. Will have to read more on how to determine if the fixgures are good or not.

I also set the scangauge rate to fast and seems a little better.

You must have had nearly zero fuel in your car when you filled up. Its a 55 litre tank. Since you zero'd the trip at the fillup. At next fillup note the miles and the amount of fuel put in from the garages fuel pump. Work out the MPG manually then. Also divide the fuel put in by 4.55 to get the gallons for the scangauge and adjust the scangauge percent to match this figure before pressing done.

Im trying to work through the xgauge stuff to understand it. Not too up on hexidecimal and 2s compliments. Getting there though.
 

LEE69

Stage 2 Revo'd
Dec 10, 2004
21,262
74
C\UK\Devon\Torquay
Ta for doing this, makes it easier to follow when i get mine next week.

Virtual beer for you
beer.gif
 

andy15star

Full Member
Apr 17, 2005
825
0
Durham
Cheers xd!, yeah i'm going to have to do a manual test on the fuel, see what that shows up!. Incidentally, i found that setting the rate to "normal" or "fast" doesn't make too much difference because the ECU only sends out signals through the OBD port at set intervals anyway (once per second ??), so regardless of what we set the rate at on the ScanGauge might have little effect on the rate the readings are updated. Obviously, setting it to "slow" does have an impact, but the difference between "Normal" and "Fast" doesn't make any noticable difference (on mine anyway).

I'm glad you figured out the MAF setting as a few weeks back i thought i could have a faulty MAF sensor. It actually turned out to be a faulty vacuum pipe (inner manifold), cost me £12 to fix !!. But it's nice to see that the readings for the MAF seem steady, confirming the MAF sensor is okay !. Credit to you xd !

If you work out any more x-gauge settings, let us all know !!

Regards,
Andy
 
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