Scanguage II

[Prairie Dog]

Anybody use a Scanguage II on a OBDII CTD? I wan't to make sure the instantanious MPG function will work.



TIA,

Scotty

 

[JLandry]

Yes and Yes.



It works great... well worth the money.



John L.

 

[Prairie Dog]

Great! thats what I wanted to hear.
Thx.

 

[mgonske]

Also yes and yes. Mine is a permanent part of my dash array. The ones with the newer software (as of several years ago) will also display average fuel economy in the main display (older ones could only display average in the tank functions), and it's interesting to watch the average respond differently than the overhead display responds. But the instantaneous display is what we get that's different from the overhead's capability. I also have an older one that I didn't bother to send in for the software upgrade on the dash of the Jeep.

 

[Prairie Dog]

I'm going to get one of the over-the-mirror mounts so I can put it up there. I noticed they have some kind of back light. Does it come on with the dash lights?

 

[AH64ID]

It will not be accurate on a 3rd gen. The SGII (any OBDII monitor that does fuel mileage) uses engine load to calculate fuel burn rate. The 3rd gen trucks (and 4th gen I presume) report load as FCA load, not injector load. So the data isn't correct. I spent the first year with my truck trying to get the SGII calibrated before I found out why it wont be. One take it will take a correction factor of 20% and the next 130% to get the gallons burned accurate.

Its good for the rest of the stuff, but not mpg.

The screen is always lit.

 

[JLandry]

Does it come on with the dash lights?

The backlighting comes on automatically soon after the ignition key is turned on... it's not tied into the vehicle lighting in any way. However, the backlighting intensity and color can be adjusted to your liking.



John L.

 

[Prairie Dog]

Well the inaccurate MPG thing sucks, that was the main reason for having it.
Do you suppose it's still a useful tool for figuring out the most fuel efficient cruise speed?
What else do people find it usefull for?

 

[p-Bar]

It will not be accurate on a 3rd gen. The SGII (any OBDII monitor that does fuel mileage) uses engine load to calculate fuel burn rate. The 3rd gen trucks (and 4th gen I presume) report load as FCA load, not injector load. So the data isn't correct. I spent the first year with my truck trying to get the SGII calibrated before I found out why it wont be. One take it will take a correction factor of 20% and the next 130% to get the gallons burned accurate.

Its good for the rest of the stuff, but not mpg.

The screen is always lit.

Interesting I have found my MPG to be right on the money the correction factor is about 137% I am using smarty with full advance timing and roktech crank sensor. It has been a great tool. I top off so I know exactly what I am burning

 

[AH64ID]

Well the inaccurate MPG thing sucks, that was the main reason for having it.
Do you suppose it's still a useful tool for figuring out the most fuel efficient cruise speed?
What else do people find it usefull for?

The thing I like best about it is intake air temp.

I don't use it at all for any fueling calculations.

Interesting I have found my MPG to be right on the money the correction factor is about 137% I am using smarty with full advance timing and roktech crank sensor. It has been a great tool. I top off so I know exactly what I am burning

Very odd. I did just look at the SGII website, and it looks like now its down to the 04. 5-05 trucks that are incompatible. I guess they figured the others out??

Do you do UOA? I can't imagine how much soot is in your oil with all that timing. . If I run TM4 my soot goes up amazingly fast.

 

[p-Bar]

Do you do UOA? I can't imagine how much soot is in your oil with all that timing. . If I run TM4 my soot goes up amazingly fast. [/QUOTE]

UOA ? I am running dual bypass filter that Amsoil doesn't recommend for this year either. Using Delvac synthetic Guess it was a good build

 

[AH64ID]

UOA ? I am running dual bypass filter that Amsoil doesn't recommend for this year either. Using Delvac synthetic Guess it was a good build

Used Oil Analysis... I am running an amsoil bypass too. . just really hard to filter out soot in modern oil, especially at the rate the 04. 5-07's build it.

 

[Prairie Dog]

I don't suppose it can read rail pressure can it?

 

[AH64ID]

Nope, if SG would get the PID's programmed it easily could...

 

[TLane]

Does anybody know how they calculate the MPG? What PIDs they are using? I've got an elmscan-5 connected to my PC and I'm writing my own software. I'd like to know how to get the MPG, and so far all I've been able to find are the public PIDs, which don't seem very useful for MPG. But I haven't thought about calculating MPG based on load, how is that done? I can read rail pressure with the standard PIDs, but I don't have a lot of use for it (yet).

 

[Prairie Dog]

Search me ~ you guys are way over my head. I don't know a PID from a POS. .

 

[goodguys75]

I want one... do a lot of towing in las vegas and parts of NV... so i would like too see what my coolant temp is at when it is 116 deg outside in the shade..... Oo.

 

[TLane]

PID is parameter ID. It's a number that the software sends down the OBD-II port to request a given parameter. The ECM returns the value of the requested parameter. There is a list of standard parameters, so those are easy to get (the protocol provides a way to determine which of the standard parameters are supported on a given vehicle). So things like engine RPM, vehicle speed, coolant temp, catalyst temp (EGT?), calculated load, throttle position, incoming air temp, etc. are all available thru the standard PIDs on a CTD.

Each manufacturer, however, is free to invent as many custom PIDs as they want. And that's where all the fun stuff is (at least, I hope so). So far, it appears to me that most manufacturers treat this as top secret information. I've searched for it and asked around, but so far, no luck finding out the codes.



A POS, on the other hand, can be identified by the slanted "bow-tie" emblem on it. Later models may also say "Government Motors" on the back in nice chrome letters.

 

[goodguys75]

where is everyone getting these scanguage..... autozone or websites?????

 

[Prairie Dog]

Thanks for clearing all that up TLane :-laf