For awhile I've been running Scangauge Boost but only while MAP was displayed at the same time;

Well - Im getting the hang of this thing!!

Now display Boost pressure without having to display MAP at the same time:

TXD: 07DF010B
RXF: 0441850B0000
RXD: 2808
MTH: 00910064FFxx

Where FFxx will fit one of the following offsets:
14.0 -- FF74
14.1 -- FF73
14.2 -- FF72
14.3 -- FF71
14.4 -- FF70
14.5 -- FF6F
14.6 -- FF6E
14.7 -- FF6D
14.8 -- FF6C
14.9 -- FF6B
15.0 -- FF6A

Best way to guess your offset would be to first display MAP on the scangauage, and while the car is in neutral, press the start button but without the clutch pedal depressed. What this will do is initiate the engine electronics without starting the vehicle. Next, take whatever MAP number the scangauge displays and complete the MTH xGauge.

Save as BST

Start boostin without MAP concurrently displayed!

 

SWEET, Man I sell the thing and couldn't figure it out. Keep playing with it and see what else you can come up with.

 

Geez man, you're the best!

Been something that has bothered me ever since I had the Scan Gauge.

 

- I know me too. I actually put a piece of electrical tape in front of the MAP reading for while. Now I display Water temp, Air temp, Air Fuel Ratio, and Boost.

 

Great find!

 

That's the NAM Team Spirit.

 

I've had turbo cars for awhile now, but never a boost guage. Is everyone getting about -10 as your reading at idle? Is that normal? Everything is entered into the scanguage correctly...

 

That is correct. Under idle and cruising the engine is under vaccum, hence the negative number. When boosting the numbers will go positive in PSI. Stock MCS should see 11-13 on the gauge.

 

Sounds good, thanks. Hopefully that will answer that question for anyone else who tries this out. Now if only I had cleaned the dash with alcohol before wasting the 2 sets of Velcro supplied...

 

Sweet! Can't wait to try it.

 

I have set this up and it works GREAT!!! Just a note, I have a digital boost/vacuum gauge installed already. When SCANGAUGE is reading the negative number, that is actually exactly 1/2 of the actual vacuum. So if your SCANGAUGE is reading -11 your vacuum is at 22 inches.

 

Excellent point.

Not "exactly" half - but pretty darn close.

For those interested - here's the conversion table. Negative numbers on the scanguage equate to the PSI less than atmospheric (approx 14.7, depending on altitude) from the psia column. Compare that to the "inches mercury gauge" column.

http://www.engineeringtoolbox.com/va...ter-d_460.html

 

So I entered the differential numbers to get actual boost minus MAP. The numbers on my scangauge are exactly 1/2 the actual vacuum reading in my vacuum/boost gauge.

 

I'm not arguing with you... I'm agreeing with you.

My point was that this isn't some magical mysterious thing... rounded to the nearest whole number, yes, the math does work out that way... when rounded...

 

Got it. Sorry....

 

Have mine set up for the xgauge, using a differential for my elevation. The highest under boost I have seen is +6, very briefly. My question is, if the neg number is half of the vacuum-type gauge reading, does this apply for the positive boost as well? Of is the + supposed to read boost in psi? If so, how can it do both inches vacuum and psi?
Or are my boost readings too low for an MCS? (Maybe I need to check my hoses on the Helix FMIC?)
Thanks,
Fig

 

A little off topic but I need to ask ya'll something. I ordered a scangauge II last night. My main reason is just to check the boost to make sure it's where it's suppose to be.

My question to you is, where does the vacuum gauge connect to read boost and does the hose and connector come with the scangauge II?

Thanks,


Mark

 

I'm not sure if you're asking about a separate vacuum/boost gauge...but the ScanGauge reads vacumm/boost from OBDII info...off of the MAP sensor. No need for hoses/connectors with the scanguage.

 

OK, I posted this in another scangauge thread, but didn't get a single reply.
One of the posters on that thread said that when reading vacuum (neg boost), the SGII reading is 1/2 of what you would see on a normal vac/boost gauge. So, -10 on the sg would be 20" of vac. My question is, what is the scale for positive boost? I haven't seen more than 5.5 on my car romping on it (car runs great) Is this reading off by a factor of 2? Or is

 

OK, I posted this in another scangauge thread, but didn't get a single reply.
One of the posters on that thread said that when reading vacuum (neg boost), the SGII reading is 1/2 of what you would see on a normal vac/boost gauge. So, -10 on the sg would be 20" of vac. My question is, what is the scale for positive boost? I haven't seen more than 5.5 on my car romping on it (car runs great) Is this reading off by a factor of 2? Or is this an actual reading in corrected psi? (I put in the differential for my elevation per the codes, I'm about 700 ft above)
Thx
Fig

 

So plug into the OBDII plug and away we go? Really? Wow, that's cool.

Thanks,

Mark

 

Yup

And because the R56 uses an on-board wideband to monitor AFR's....AFR's can be displayed on the ScanGauge as well. The SG is seriously one of the best little tools ever!

 

I just put the SGII in my car and I absolutely love it. I set it to read WT, IA, Volts, and boost (thank you unclemeat). I too had to set it at 13.9 for it to read 0 at idle. I got a reading of a little over 13 for a second. very cool little tool.

As a bonus I used the SGII to read and remove a code (P0141) from our 96 Malibu that the sitter drives. Huge bonus.

On a side note, I mounted it with the Craven speed tach mount. IMO a great piece, looks like it belongs there (to the right of the wheel up top) and is in plain sight.

I'll post a couple of pics if anyone is interested.

 

I'm definitely interested- post them up!

 

Yeah I wanna see that 2