Post your ScanGauge setup & Adjust %
 

Hey guys, I know there is a bunch of us with Scangauges and thought it would be great if we all pooled together our info and shared our setups. This may help others when calibrating their SG if they have a similar or even the same vehicle. *I know there are variables to every car but this could be a helpful guide. So, for instance what was your fuel usage adjustment for your vehicle and maybe even post up what you like to have up on your SG screen while driving. :thumbup:

http://www.scangauge.com/assets/grap...homehdr_2a.jpg

**based on the pic, I wonder what car can get 7mpg at 129MPH!!? :D

Heh, if I get the scangauge, will try and see if I can match those numbers!! NOT lol

Only adjustment:

+10.1% Gallons

A little pessimistic, but it's like setting your clocks ahead 5 minutes so you're not late :p YMMV

I don't have X-Gauge (yet)...

RH77

+8.7% on the Elantra. The real adjustment probably is around 5% but I like to know the number I see is a worst case scenario.

The TDI is just not accurate on the scangauge. I just use it as a relative incidator to see how I'm doing between trips. It would need a different correction factor for each rpm. In fact, it the correction factor could be just a linear equation formula, it would be much more accurate.

Between 5 and 10% on a stock smart cdi diesel, and looks like 10 - 15% on the model 451 gas

A remapped smart diesel needs to be at 30% +/-

2008.5 Mazda3 hatch, 2.3L, 5spd auto...right now correction is +12.1% and it's just about dead-on.

FunkSkunk -

I have a ScanGauge I. I set the engine to 1.9 Liters, the speed to +2% for my tire/odometer calibration, and the tank to 11 gallons.

I don't use the tank-to-tank fuel calibration function because I don't want to do the fill-up-to-the-top and then drive till it's at E or on fumes. I always fill from 1/4 to 3/4 full, which is about 5.5 gallons. For this reason, my day-to-day current MPG is only a *relative* barometer of MPG for me.

Here are my usual instant choices :

TPS IAT
MPG FWT

CarloSW2

98 taco
engine 2.7
10.1 % fuel adjustment
+2 speed
cuttoff is set to 0 cause i dont use it idle is 14-15 on tps, 77 wide open. i was getting funky readings.

it is usually.1 pecent off by the most.

camry i am currently doing my first set up with it.

I have my fuel calibration at +5% and it seems to be reasonably accurate. I don't use cutoff (set at 0) because I can't say for sure that my car does this. My TPS reads from 19 at idle to 92 at WOT. Right now my main display shows:
TPS MPG
LOD TRP (that's my abbreviation for trip gas mileage)
The bottom left spot is kind of a wild card. I put the horsepower gauge there often, since it is a good all around indicator of how hard the engine is really working. I just put load back there to experiment with what load when accelerating will produce the best FE. Sometimes I put coolant temp there, like when I am trying to figure out how big a hole I need in my grill block for adequate cooling, since the stock temp gauge is useless for this. Or sometimes I put IAT in there to see how much it deviates from ambient temperature. I have some fun manufacturer specific X-gauges for my Escort too: trans fluid temperature, torque converter slip ratio, fuel pulse width, gear ratio, torque. Mostly curiosities, although knowing what the converter is doing can be helpful.

Any other Metro 1.0L owners want to chime in on this?

My speed offset is easy: 6% because of the transmission swap (the 8 valve SOHC 4-cyl car had smaller diameter wheels/tires).

My problem is I don't drive enough to get a chance to nail down the fuel offset. (Also, I haven't been trying very hard.)

I've had the SG2 set at +8.0% gallons for a while, but my fill today was way off: 7.83 gal actual vs. 8.82 shown on the SG. That's 12.6% high, which suggests I actually need a *negative* offset to be accurate.

Looking back through my log, the actual vs. SG reported gallons seems to vary a fair amount. And I almost always use the same gas pump.

Mine is also really high, something like 10.5% or so...

Speed is +1

The 12.6% error just means you have to lower the 8% a little, not that you have to subtract 12.6 percentage points. According to some simple math 7% should be right on if your fillup was accurate. 7% is actually what I have been using (I reported 5% earlier) and it has been pretty close.

2002 Toyota Corolla S - 1ZZFE 1.8L engine: 9.9%+ on the Scan Gauge I.
This number is from many tanks of gas, and I can confidently say that this mileage figure is within 0.2% of actual mileage, every time.

Am I seeing a trend on the ~10%+ line here, or is it just a coincidence?
Darin, we may have you calling Ron about this :D. This would give an overinflated figure, right? One too many six packs in me to think about even this low-order math... perhaps in the morning...

I filled up again today, after a long trip (750 km), and using a +3.0% fuel offset, the SG was still reporting more fuel used (6.68 gal) than the pump read (6.33 gal).

Are you sure about that? If I remove the 8% correction from the SG's calc for fuel consumed (8.82 gal., in post #10), then the un-corrected amount is 8.17 gallons (8.82 / 1.08). It's still higher than the actual fill amount of 7.83 gallons. Am I doing it wrong?

I'm going to drop it to 0% correction factor for tomorrow's leg of the trip. I'm still predicting it'll end up needing a negative correction.

I wonder why it has changed from a positive offset to a negative one.

I think I had it wrong earlier. If you were using a correction factor of + 8% and the SGII reported 8.82 gallons used, that means that it actually thought you burned 8.17 gallons, and applied your chosen correction factor to come up with 8.82. So based on that you should be using a correction factor of - 4%, which is about what you estimated. So yeah, go with that. As to why the correction factor seems to change, that's a good question. Mine was pretty accurate at + 5%, now it seems to work best at + 7%. Perhaps it is seasonal, I.E. the SGII is unable to account for changes in air density from different temperatures? This wouldn't seem to make sense however since it has access to IAT data. Does anyone know exactly how the SGII comes up with it's fuel usage estimate?

Aha! I think your question solved the riddle.

The SG calculates fuel consumption based on air consumption, and extrapolates fuel use with a formula based mostly on stoichiometric air-fuel ratios.

But I've changed my driving style. I used to do a LOT of pulse & glide (P&G), but now I mostly drive with load (DWL). In the Metro, P&G consists of a lot of non-stoichiometric, open loop acceleration. DWL keeps me in closed-loop stoich mode almost all the time.

So, the ScanGauge probably didn't know what the rich burn rate was/is, and obviously it was guessing wrong. It was underestimating it, which is why the offset that worked best when I was doing lots of P&G was +8%.

Also: maybe Linear Logic updated the SG's formula between versions? I've also gone from SG1 to SG2 since I first figured out that +8% offset.

Anyone else upgraded and noticed any difference?

Good reason to use a MPGuino.

1996 Civic DX (d16y7) manual 5
Fuel +8% (or +12% with e10)

P&G driving all the time.

That's an interesting observation that I didn't take into account. :thumbup: I'm sure the Winter-blend is now in effect, so the adjustment may be needed.

-Rick

Wayne G has registered a similar effect between summer/winter gas. We have the same year-round here, but a few months ago we switched to (almost) all E10 instead of straight gas.

http://ecomodder.com/forum/member-gu...cture693-1.jpg
This gets 16mpg at race speeds, usually averaging over 110mph

The fuel readings are driving me nuts. As I suspected before I got the ScanGauge, my tank measures differently at the top, middle, and bottom. After I first calibrated it at 1/4 tank as the manual suggested, it was dead accurate at 1/4 tank, ie. when my fuel gauge read 1/4 tank, so did the ScanGauge. But at fill-up, it was WAY off. Oh well... since I usually fill up near empty, this new calibration should be more helpful. But then I decided to fill up mid-tank this week and it's way off again.

And the real problem is that it's obviously giving screwy MPG readings throughout the week. Last week the SG was off by 15% at fill-up. The other day after my first trip, the Trip Average differed from the *calculated* trip average (from Trip Miles divided by Trip Gallons) by about 15% in the other direction. WTF?!!

Suggestions?

Just got the Scan gauge hooked up, really amazing. Really shows a lot of data and I'm not even setting it up yet. I'm impressed

Try taking an average over two or three fillups, that should help smooth out any filling inconsistencies/inaccuracies.

I'll suggest a compromise that should give you a way to calibrate the SG without running the tank down to E.

The point of the calibration process is to have the car burn enough fuel in one fill cycle so that it's averaging enough data together to get a good representation of driving patterns. Can you do this:

Fill till the handle clicks off. I don't recommend filling till it spills over out of the fill pipe and I don't think the SG manual recommends that either. Enter the fillup into the SG but - as the manual says for the first fillup - don't enter any correction. Just leave the "gallons" number as the SG shows it, regardless of error. Then drive as much as you're willing to. Maybe down to 1/4 tank or 1/8 tank. You don't have to take it to E. I don't like going to E either, myself. After this 2nd fillup (again till it clicks off, like the first time), enter the correction as the manual describes. If it thought you were going to need 9.6 gal. and you used 10.1 gallons, adjust it up so it says 10.1. You're done. That's the correction. Be sure to hit "Done" and "Save" so your correction is stored.

Do beware of any stupid silly readouts from the SG. I think the data in mine gets corrupted sometimes. Now and then it will say that I've driven thousands of miles in a half day or so, or have gotten ridiculously high or low mpg. When that happens I ignore the data for that tank.

First off, I've pretty much stopped thinking of a fuel gauge as a "gauge". They're not accurate, and I don't think they ever were intended to be accurate.

And then...
I've been driving my Civic HX with ScanGauge for about a month now. Every now and then it goes kablooie. It will say that I've gone thousands of miles in a short time or some other ridiculous things. It looks like somehow the data got corrupted.

I've been able to reduce the frequency of this happening by waiting at least 3 seconds after an engine shutdown for coasting, before I key the ignition back on again. The SG saves its data after a shutdown and I think that it gets messed up when it's saving data at the same time the car's computer is rebooting.

Bruce -- just checking, do you have the fuel setting to "Hybrid"? The SG will stay active when the engine is off, but keyed back on...

-Rick

You know what hurts?

You have a 75 litre tank but you did the setup as 79 litres and always thought it was 79 litres. Then you go down to under 7 litres remaining on your first tank of winter gas, not knowing when to refill cheapest. Then, just after driving past a gas station and then a short discussion of needing gas you lose power, coast a very long way and safely stop and then realize you should have slammed the brakes right there and saved 3 blocks! LOL

Then you have to buy the little 1 gallon jerry can than dumps ¼ of the gas on the street.

Don't be your ScanGauge's fool!!! :rolleyes:

Anyone notice their calibration get off when winter hit? I went ahead and re-calibrated mine because it kept getting farther and farther off. The last tank before re-calibrating the scangauge was reading 15mpg when the final calculation came out to be 16mpg's.

Which way was yours off? I had to go from 5% to 8%, sounds like yours was off the other way.

Both ethanol and winter-blend rfg have lower energy content than summer gas, with more oxygenates. Both together is a double hit. Since the Scangauge only measures airflow, it doesn't know that the ECU is adding a little more fuel to the mix to make up the difference. You need to INCREASE the fuel offset % to account for this. (ie. without adjusting, it reads higher mpg than reality)

Yes, it's set to "Hybrid" for that reason. But I'll double check, just to make sure it didn't get knocked off its setting due to some mishap.

Thanks.

That makes sense to me. The problem is my scan gauge was reading 1mpg lower then the final calculation at the pump(ie. the scangauge thought I had used more fuel then I did).

PaleMelanesian - of course. Thanks for clearing that up.

ScanGuage calibration
 

I "re-calibrate" the ScanGuage II at every fill-up. I find it varies a few percent each time but the larger the fill-up the more accurate it is. I use the red button, MORE, FILLUP etc. and SAVE when done. I don't consider ScanGuage mpg values to be absolutely accurate but the instant feedback is very useful.

I use:
MPG WT
LOD MAP

The Scanguage temperature readings are much more accurate than the factory temp guages as they have been "idiot lighted" in many modern cars (important when grill blocking). I use the MAP setting to monitor boost in my turbo car and I will cycle through and monitor intake air temps too.

I find the CURRENT and TODAY trip mpg TRIP readings useful as well.

Just got my Scangauge II yesterday, so too early to say what normal setup is.
I notice two anomalies during pulse and glide.

1. Horsepower (X-guage) reads a constant 3.x with EOC.
2. GPH (Gallons per hour) reads a constant 1.53 with EOC.

Fuel Type is set to Hybrid.

Is this typical/normal SG II behavior???

I've only filled up and calibrated my SGII once in the Prius I just purchased so it still has some tinkering to be done in regards of the percent but I'm running 8.8% right now and the SGII was about 1 mpg off of actual fill numbers on my first fill up.

I use RPM TPS
MPG FWT

I like monitoring RPM to help me maximize FE up larger hills. Uphill, I will sometimes see RPM over 2000 and gently let my foot off the gas to drop RPM's before reapplying foot to pedal (which usually results in RPM settling in around 1800)

I also just started using TPS to monitor throttle position. It reads 13 when my foot is off the pedal so when I get the Prius into "dead band" I have found that any throttle over 13 knocks it out of dead band (over 40 mph also knocks it out of dead band). With 13 being my baseline TPS there is a little give in the pedal before TPS goes higher so I can still accelerate with a little throttle in dead band.

MPG I use just as a guide vs. using the mpg bar on the Prius stock in-car display...just kind of a reminder to lighten up on the pedal if I see MPG dipping.

FWT I also just started using as I installed a grill block. With upper blocked and one row of lower blocked I run around 180-190. With temps on the rise I just want to keep an eye on temp.

The 41 mph cutoff is programmed in. It's to protect the motors in the electric CVT mechanism from excess rpm damage.

I know diamondlarry only has a 2% offset or so. I suspect the bladder in the Prius tank got you.

Pale,

I've only filled up my SGII once so I probably have some margin of error in my current SGII percentage. After a couple fills I should be close to smack on. My current tank numbers look like they are running about 1.5 mpg lower on the SGII than actual (comparing my last fill to the in-car mpg numbers). Running somewhere in the 58-59 mpg range on current tank after 275 miles.

I have a Turbo Diesel truck and set my Scangauge at every fill-up. When I first installed I left it at 0 and then when I filled, lets say 20 Liters or more I reset it and so far its been within 2% which I feel is not bad at all considering diesel fuel foams a lot and tank differential can exist. I found there is different readings for different fuel pumps. I do use a lot of fuel when I haul my camper and refuel maybe 2 times per day. I have a programmer and on stock it's close to 0% adjustments. On load A setting of the programer its at 17% more fuel to fillup, making the MPG reading much better. and at setting B on the Programer its at 37/43% setting making it much better on fuel millage. So I usually use load A and set the SGII at 17% on the plus side. I am very happy with this and most of the time the readings are equal to the hand Calc. numbers. So far I have raised my towing MPG by 2 and my Highway unloaded millage by 4. The best values have come with the cruise on. Most truck hics are not adjustable and never show the instant mileage easily, so the scangaugeII has been great for me. Yes my truck could show 8.9MPG and 129MPH. Or maybe lower MPG because at that speed I move tons of air that requires lots of fuel.

Mine was very close out of the box:

Speed = +1
Fuel usage = +2%
Cutoff = 21

Right now I have my gauges as follows:

AVG TPS
MPG IA

I love the SGII. What a great tool and I never heard of it until I visited Ecomodder.com. I find the instant MPG and TPS readings helps me keep my foot out of it and hold steady throttle. I would say I have gained about 1MPG in just the first week using the SGII.