Scangauge

[Jan van de Wouw]

Tha Aygo does NOT have CANbus aboard, this would add to the cost of the

car, while single systems as we have now still work their task perfectly.

The ScanGauge plugs in to the OBD2-port (On Board Diagnostics)...

@ Mark: I have a ScanGauge in my Aygo, mounted above the rearview mirror,

bu usually dont have the MAP-values on the display. I also rarely run my car

full throtttle let alone for prolongued periods of time, but if I remember to

do so I'll have a look at the readings tomorrow...

[Jan van de Wouw]

As promised I had a look at the MAP-readings today and while testing it ocurred to me:

with the throttle wide open you get a reading of the ambient air pressure as its Manifold Absolute Pressure,

not relative. So when the ambient pressure is higher or lower than 100 this registers on the MAP-reading too.

With the ignition on, but the engine not running I actually got readings of about

97 this morning and 105 after work. So I guess there's no problem to speak of...

[VSD]

ok matt 303....so why didn't they manufacture a sort of display on all 3 models????

[adilmon]

ok matt 303....so why didn't they manufacture a sort of display on all 3 models????

It's all about cost. Adding wires to a loom doesn't cost nearly as much as what they can charge customers for the optional extras. Citroen have gone to the absolute limit, which is why some have likened the C1 as a modern dat 2CV. One example of cost "optimising" is that the original display was intended for the centre of the dash above the stereo. see here

http://toyotaownersclub.com/forums/index.p...mp;hl=prototype

Having the driver's info in the steering column means the display can be smaller and use a cheaper LCD set up

[adilmon]

OMG look how ugly scangauge 1 was

[Jan van de Wouw]

If you think THAT's ugly, have a look at the Brockway Engineering R1000:

Costs over twice as much as a Scangauge, is WAY bigger and can show much LESS info.

It can only show two parameters at once and only in one of 7 pre-determined modes...

On top of that it lacks all possibilities it needs to be a proper tripcomputer...

[mihai_ro]

Hello there,

I also successfully installed the ScanGauge in my Aygo by cutting a small hole for the plug in the back and using the Velcro tape provided.

One question though...from the series "dumb questions":

How can I make it display the average fuel consumption ?

Right now while in the Gauge Mode I have set:

- RPM

- Speed

- LHK

- LPH

But LHK shows while not moving (standing at a stop light): 9999

My Aygo has automatic gear changing if this makes any difference with this.

Also when accelerating it shows instantaneous consumption and I see stuff like LHK: 45, 50, etc.

I changed from the options the Rate to Slow but still no luck.

Can you help me with the settings you've made ?

Thanks,

Mihai

[Jan van de Wouw]

At a standstill the 9999LHK reading is normal, since you're not

moving and ARE burning fuel your usage is infinate liters per 100km.

As soon as you start moving the gauge will show actual

economy and with the LHK-reading less is better.

When accelerating higher readings are normal, when cruising at

a set speed is should be quite level and braking on the engine (is

that possible with an MM-T?) will give a reading of 0.0LHK as inertia

keeps the engine turning so no fuel is needed to keep it going...

If you want to have average economy for your trip or tank

you need to make a Trip-Gauge using the X-Gauge function.

A trip-gauge would still start up high, then slowly go down.

And at a standstill you'll see the Trip-economy rise up,

since you're not moving and ARE burning fuel again...

As for the settings: keep the rate at the higher setting, let

the ScanGauge handshake by itself (so no protocol-forcing)

and set the Fuel CutOff to 15 (standard is 24).

Setting that last one improved my readings over one tank to be

within 1% of the actual economy I derived from manual calculations.

[REFZ]

Has anyone fitted the scangauge in a tidy manner?

Here's a picture of my installation

[domcars0]

Hi everyone and sorry for my Frenglish ;)

I would like to know if someone has installed the Scangauge II (V 3.16) on a 2009 citybug gas model (the new with 'optimal drive' Toyota motor) ?

I owned a new Citroen C1 and have installed the scangauge but it seems that the fuel eco gauges are inaccurate ?

In fact, it seems that the fillup adjustement factor depend of my driving style !??

For exemple when I drive often with 'pulse and glide', the fillup adj. factor is more than 30% up, but when I drive with stabilized speed the fillup adj factor is less than 5% up ? So the fuel economy gauge is completly inacurrate. :(

Here are my settings:

Engine : 1.0 liter

Fuel Type: Gas

Fuel CutOff: 14 (no-throttle TPS=10)

Tank Size: 35 liters

Speed: +4%

FillUp: sometimes > 30%, sometimes < 5% !!

Does anybody have the same problem?

[Jan van de Wouw]

What you're describing is quite normal, this has to do with the fact that

the ScanGauge has to deduce some of the data from other data.

If you drive the car full throttle a lot (hard acceleration and such),

the injectors go to 100% duty cycle, which makes their flow less

accurate and dependant on the fuel pressure amongst other things.

In my experience, driving the same way allmost all the time I never have

to adjust more thatn 2% up or down at a fillup. But If I've been in situations

where I neede to overtake fast a couple of times the adjustment can be

up to 15% at some times.

Whe I return to my normal driving style after that it takes a couple of tanks

for the adjustment to level out again, as at every fillup the adjustment seems

to over- or undershoot, due to a lack of hysteresis...

[domcars0]

What you're describing is quite normal, this has to do with the fact that

the ScanGauge has to deduce some of the data from other data.

If you drive the car full throttle a lot (hard acceleration and such),

the injectors go to 100% duty cycle, which makes their flow less

accurate and dependant on the fuel pressure amongst other things.

In my experience, driving the same way allmost all the time I never have

to adjust more thatn 2% up or down at a fillup. But If I've been in situations

where I neede to overtake fast a couple of times the adjustment can be

up to 15% at some times.

Whe I return to my normal driving style after that it takes a couple of tanks

for the adjustment to level out again, as at every fillup the adjustment seems

to over- or undershoot, due to a lack of hysteresis...

Hi Jan van de Wouw, thanks for your answer but ....

Waouh... I'm completly disapointed now :( ...

You say me that it's normal that the Scangauge fuel economy gauge is accurate only when you always drive with the same style ?

But what for is to do the Scangauge Fuel economy gauge ?

1) If I always drive with the same style I don't need a computer to know how much fuel my car consume .. cause I know that (average).

2) If I always need to drive the same way to know how much fuel my car consume, how can I know

what is the best drive style ?

3) Why did the manual say: 'use the same pump, face the same way, fill to the exact same level' if the fuel gauge depends so of other factors ( fuel pressure amongst other things..) ?

[Jan van de Wouw]

The instructions for filling up are an effort to dismiss as many variables

as possible, as they all influence the readings of the ScanGauge.

Lets say there's 5 actual liters of fuel left in your tank and you've

driven 300mi. You go up to a pump and fill up untill the pistol shuts

off, the pump reads 30 liters, so you input thet into the ScanGauge.

Economy is 10mi/liter. (Which is low, but it's an easy example).

On a different instance you have 5 actual liters in your

tank again and the tripmeter reads 300mi again...

Now you pull up to another pump or you decide to fill the

fillerneck too. The pump now reads 32 liters,

while the ScanGauge says you needed 30.

This get economy down from 10mi/liter to 9,3mi/liter, even

though you actually USED the exact same amount of fuel!!!

You might be disappointed with the accuracy of the ScanGauge,

but I read a (Dutch) test a little while ago on OEM on-board

economy computers and even those have quite some deviation

from the actual economy and fuel left in the tank.

And these OEM computers usually have an actual flowmeter in the fuel

lines to calculate the fuel usage, instead of trying to calculate the useage

from knowing the engine size and the duty cycle of the injectors...

I think the ScanGauge does an EXCELENT job for what it is and how it's connected.

Have a look at my stats in Spritmonitor.de and compare the actual economy

to the one from the ScanGauge (hover the BC-icon for the latter) and you'll

see the deviation isn't really that much, at least I think so...

[Wiffy0404]

Hi folks

How much is one of them Scangauge?

Thanks

[Jan van de Wouw]

About £120 plus shipping on eBay

[UKOBD]

About £120 plus shipping on ebay

Or £131.00 delivered from the UK, and with a UK warranty from us :)

Gareth

[domcars0]

So, after experience here are my setting (Citroen C1 2009 with 1.0L Optimal Drive Toyota Motor):

Engine : 1.0 liter

Fuel Type: Gas

Fuel CutOff: 9 (no-throttle TPS=10)

Tank Size: 35 liters

Speed: +4%

Fillup: -1.5%

As you can see the CutOff is set to 9 (which means that the ScanGauge does'nt detect it cause the no-throttle TPS=10 ) ....

This is my first Fillup with this settings, and the Fuel economy seems to be more accurate (-1.5%). I will drive now with another style to see if

the results (fuel economy) are always acceptables.

[Jan van de Wouw]

Why would you want the cutoff to be off? That way the economy

when braking on the engine is too high if you ask me...

[domcars0]

Why would you want the cutoff to be off? That way the economy

when braking on the engine is too high if you ask me...

I don't want the cutoff to be off, I just want my scangauge fuel economy average accurate .. If I put the cutoff on, I have to set the FILLUP calibration to more than 20% and this setup calibration become very dependant of my driving style. With the cutoff off I remark that the fuel economy is less dependant of my driving style and more accurate (FillUP cal=-2.6%)... I know that the real time fuel economy is probably wrong (particulary when coasting) but almost the AVG is more or less ok.

May be has my scangauge a problem? Do you think it's normal to calibrate the Fillup calibration to '-2,6%' when the SG cutoff is OFF and calibrate the Fillup calibration to more than 20% when SG cutoff is ON on a car which have a DFCO.

Again sorry for my frenglish and thank you for your help...

PS: I had a look at your stats in Spritmonitor.de, I saw that your ScanGauge is often false by more than 5%... Do you think it's good??

[Jan van de Wouw]

What's a DFCO?

And YES, I still think the ScanGaugeII is a good product, as

as I mentioned before tripcomputers that are factory fitted

often have similar deviations from actual economy...

With the Cutoff OFF, how much do you have to change your

calibration at fillup? I regularly don't have to change it at all,

but there are instances where I have to recalibrate by more

than 10%. I really don't care that much; the SG helps me

drive more economical and that's what I bought it for...

[Wild west Drifter]

Don't use the fuel settings on mine.

4 settings I use are Volts, Water Temp, Inlet Temp and MAP. More interested in monitoring the engine .

Means I don't push the engine until it is at least over 65 degrees. ;)

[gordonh]

I'm going to have to check the numbers on mine, the fuel count when I fillup is never accurate, looking at the numbers the last fillup was 36.5mpg which is just crap.

I rarely use the car so don't have much historical data for it yet, only 2700 miles since Sept'08. So far it's been between 36.5 and 48.3 mpg.

[domcars0]

What's a DFCO?

DFCO means 'Deceleration Fuel Cutoff'.

And YES, I still think the ScanGaugeII is a good product, as

as I mentioned before tripcomputers that are factory fitted

often have similar deviations from actual economy...

With the Cutoff OFF, how much do you have to change your

calibration at fillup?

I'll say that later (I do not use my car very often at this time)...but I think I will change less than with CutOff ON. As I said before , for my first fillup with the Cutoff OFF, my calibration setting was -2.6%.

[Jan van de Wouw]

I've just filled up the car ad have set Cut Off to zero to test.

On the 6mi trip home I immediately noticed that the consumtion NEVER

goes down to zero, even when braking on the engine, so I'm guessing I'll

come up WAY too high on consumtion next time I fill up (probably next week).

[domcars0]

I've just filled up the car ad have set Cut Off to zero to test.

It's completly normal (even it is false)

On the 6mi trip home I immediately noticed that the consumtion NEVER

goes down to zero, even when braking on the engine, so I'm guessing I'll

come up WAY too high on consumtion next time I fill up (probably next week).

Did you reset completly your settings ? It's important to start a new setting from 'scratch'..(read the Scangauge manual)