Scangauge Boost Gauge and General XGauge Coding info

[The.Noof]

I am currently monitoring my 'hyper-mile' attempts using the information provided to me by my Scangauge II. Has any one figured out a way to create a math function that would tell you the distance traveled while the fuel injectors are off? (seeing as there is no fuel flow when in gear and coasting)

 

[weasel]

If there is no flow, then your engine isn't running ...

 

[bestmapman]

Hi Mike,

Nice meeting you in Madison at "The event". Great work on the scanguage.

 

[seftonm]

Thanks Jud, it was great to meet you too and I hope I'll see you again some time. Good luck with the tdifest mileage competition

The.Noof, I don't know of a way to create a gauge that will give the distance while coasting with fuel cut. I do not believe it will be possible with the current ScanGauge II firmware.

 

[ibanix]

That's true, however VAG COM displays an EGT value somehow,

Er, what? I'm pretty sure VAG-COM/VCDS can not display EGT. Would love to know how you managed that.

 

[ibanix]

hey seftonm- if you can figure out the coding for a fuel temperature xgauge lots of members would be grateful!

SGII works by reading the Mode 1 OBDII PIDs. These are predefined. There isn't one for fuel temp for VW. Ergo, this can not be done.

 

[Honeydew]

dammit!

 

[MAXRPM]

great write up

 

[MAXRPM]

Has anyone figured out how to get the coding for fuel temp in the xgauge yet?

 

[Mrrogers1]

Has anyone figured out how to get the coding for fuel temp in the xgauge yet?

Um, see post 3 up from yours... Can't be done.

 

[vw4life]

SGII works by reading the Mode 1 OBDII PIDs. These are predefined. There isn't one for fuel temp for VW. Ergo, this can not be done.

How about the EGR temp that is found on the B5.5 with BHW?

 

[Shawnz]

Thanks for the write-up. FWIW the boost xgauge works on a 7.3L F350 Powerstroke Diesel too!

 

[NarfBLAST]

Should work on anything with a turbo... not sure what happens when you go into vacuum tho?

If you like the boost xGauge you might also enjoy the MAF xGauge (link in my signature). This will work on any OBDII vehicle also.

 

[kooyajerms]

Narf did you figure out a Maf requested vs the actual? Threads so old, didn't notice I missed the Maf xGauge!!!!!

 

[NarfBLAST]

Narf did you figure out a Maf requested vs the actual? Threads so old, didn't notice I missed the Maf xGauge!!!!!

It will only tell you the MAF actual in units of grams/second. OBDII only gives you "actual" data.

 

[robhurlburt]

Does anybody know why this wouldn't work on a Saab 9-3 (2003)? I get a MAF reading, but when I add the X-Guage for this it doesn't show anything. Another person I know has tried this (Saab owner) with no luck either.

 

[robhurlburt]

along with the average (today) mpg xgauge. Now I'm set.

How did you do that?

thanks

 

[seftonm]

Does anybody know why this wouldn't work on a Saab 9-3 (2003)? I get a MAF reading, but when I add the X-Guage for this it doesn't show anything. Another person I know has tried this (Saab owner) with no luck either.

The Saab might use the CAN-bus. Try TXD=07E0010B instead of 686AF1010B and see what happens.

 

[Shawnz]

How did you do that?

thanks

It's in the Manual. It's my latest xgauge too .

Now I track:
Instant MPG, Average for the tank, Average for the day . It's starting to cause MPG OCD.

TXD - 01
RFX - 800000000000

Then OK until you name it. I called mine ADy (Average for the Day)

 

[robhurlburt]

thanks for the info guys, I'll give thos suggestions a go tonight. much appreciated

 

[robhurlburt]

The Saab might use the CAN-bus. Try TXD=07E0010B instead of 686AF1010B and see what happens.

It works! Sorta...I am reading -10.6 at idle I double checked the math code, and its the same as the one on the front page, but my last 4 numbers are ff72

It's in the Manual. It's my latest xgauge too .

Ah, sorry mate. Didn't see it, I will have to check for the average for the tank. That would be nice to have as an Xguage too.

 

[NarfBLAST]

It works! Sorta...I am reading -10.6 at idle I double checked the math code, and its the same as the one on the front page, but my last 4 numbers are ff72

Does your Saab use gasoline and have a throttle plate? It may generate vacuum at idle. That reading may be normal at idle for example my normally aspirated Mazda5 2.3L gasoline engine reads around 4 psi absolute pressure at idle. If you take 4psi and subtract 14psi you get -10 psi.

 

[robhurlburt]

Does your Saab use gasoline and have a throttle plate? It may generate vacuum at idle. That reading may be normal at idle for example my normally aspirated Mazda5 2.3L gasoline engine reads around 4 psi absolute pressure at idle. If you take 4psi and subtract 14psi you get -10 psi.

hmmm, im not sure. I know other people have hooked up regular boost gauges and aren't reading negative PSI.

 

[Shawnz]

hmmm, im not sure. I know other people have hooked up regular boost gauges and aren't reading negative PSI.

Were they boost/vacuum or just boost?

If you look at the MAP value you can see what's going on. If you go below atmosphere it's gonna show negative boost (vacuum).

 

[NarfBLAST]

hmmm, im not sure. I know other people have hooked up regular boost gauges and aren't reading negative PSI.

You are not sure if it runs on gasoline?

Good point Shawns, what is the reading of the built in Scangauge MAP gauge at idle? I am placing bets on 4psi.

 

[seftonm]

Is your 9-3 a gas or diesel? Most boost gauges for gasoline cars will have both PSI and VAC (vacuum). Anything in the VAC range corresponds to negative PSI, and an idling gasoline engine should be in the VAC.

 

[robhurlburt]

Is your 9-3 a gas or diesel? Most boost gauges for gasoline cars will have both PSI and VAC (vacuum). Anything in the VAC range corresponds to negative PSI, and an idling gasoline engine should be in the VAC.

it is a gasoline engine. At idle it the MAP is 4.2, so I guess it makes sense. Not really a big deal, but it would be nice if it started at 0, and went positive, instead of negative to positive

 

[Pcar993]

Wow, how accurate is this boost gauge on SG if assuming you have selected the correct atmosphere pressure?

How can i determine what my atmosphere pressure is where i live?

 

[Vince Waldon]

The complication is that absolute atmospheric pressure (which is what the MAP reads) varies with the weather...

I just used the numbers above as a starting point and then played with the constant until I got it to read zero... took about two iterations. It now will generally read +/- 0.2 psi on any given day, depending on the weather.

True electronic boost gauges take a snapshot reading when they power on to calibrate themselves to the weather de jour.

 

[NB_TDi]

The complication is that absolute atmospheric pressure (which is what the MAP reads) varies with the weather...

I just used the numbers above as a starting point and then played with the constant until I got it to read zero... took about two iterations. It now will generally read +/- 0.2 psi on any given day, depending on the weather.

True electronic boost gauges take a snapshot reading when they power on to calibrate themselves to the weather de jour.

Bingo!

I chose to use a gauge pressure sensor in my boost gauge. I'm now somewhat feeling I should have used a absolute pressure and just have it set to take the starting pressure into account for all future calculations.