For those looking for boost pressures, keep in mind what is displayed on the ScanGaugeII is not really the boost pressure but the MAP sensor. You'll need to subtract the relative pressure (typically 14.7) from the value to get your vacuum or boost readings. If you have a PnP ECU and are running a higher boost, it will not accurately display your real boost as it is displaying what the ECU thinks it is, not what it actually is.

It also does not do any data logging.

 

Or, conversely, it displays manifold air pressure, which includes ambient pressure. You can subtract or not subtract. Boost is simply a relative measurement, like using metric or non-metric. You can convert if you want, but no need to.

 

True. Custom X-Gauge programming for the SGII has been posted elsewhere here (by me) that does the math for you and displays approximate boost/vacuum.

I'm not sure I understand the other comment regarding PnP ECU, etc... Why would the MAP not report true pressure?

 

So just subtract the 14.7 and you have a ''regular'' boost reading. ie. psi

 

Yep... or follow these directions and the SG will do it for you...

 

Total bonus, thinking gets in the way of motoring. Thanks for posting that.

 

Check Waymotorworks.com out or PM Way as he's on here.

 

good stuff, willl do

 

Thanks, I had not seen the posts about the Custom X-Gauge for it.

The MAP sensor does report true pressure but it is being read at the OBDII port by the ScanGaugeII (this is from the ECU) and not directly from the MAP sensor. The PnP ECU fools the ECU into thinking it needs more boost, changes A/F per the chip tuning, etc. These changes are not seen by the ECU, it may think you have 5 pounds boost when you might have 12-15 (I've no idea what the ratio might be). I'll be able to give accurate numbers once my boost gauge arrives. I do know that while my MINI was on the dyno, it was running in the 19-21 PSI boost range, the ECU would have at most seen at the max factory boost during those dyno runs..

Unichip claims the PnP ECU leaves no trace that it was installed when removed. So there would be no record of the higher boost pressures, etc.

 

Thank you!

 

Ahhhhh.... now I get it.
Thanks!

 

Miniac: Just got a ScanGauge II and was interested in your mount in the cubby. From the picture it isn't apparent how you mounted it there. I have an '07 MCS and think the cubby is about the only good place it will go. Can you explain a little of how you fastened it there?

Angelo

 

I've got AutoEnginuity ScanTool on my laptop with the BMW/MINI extention to do airbag code clearing and datalogging, but I have a ScanGauge II in the R56. I will see if I can find the list of non-standard sensors available for the R56.

BTW, Way Motor Works has the ScanGauge II on sale for 145 plus 5 bucks shipping. Log in, add it to your cart, and apply the discount code wayscan2.

 

I have one as well and mounted it to an aftermarket shelf in the same area. Pics in my gallery.

 

Looks nice, thanks for the tip.

 

The cable to the Scangauge II is visible in the picture. It does fit behind the corner of the shelf support underneath it. Looks better without that wire showing.

 

BlimyCabrio: I followed the directions and made an Xgauge that I called BST for boost. I've checked the entries 3 times and had someone else also check and everything is correct. But when I ask for BST to be shown only the letters come up; no numbers not even 0.0 So I know I'm doing something wrong but what? I have an 07 MCS built in Sept.

 

Worked perfectly on my '04. (Thanks, Blimy!)
You know that there are no spaces, right?

 

Hmmmm.... somebody else with an R56 said that they had to set the SG to display MAP and BST at the same time to get it to work... which isn't the case for me... but have you tried that yet? Otherwise... Hmmmm....

 

I'm not sure that what I did will work on the R56 ...

https://www.northamericanmotoring.co...30#post1988030

 

You are the man!! That did it. If I have both MAP and BST the boost reads, if I use BST only - no dice. Thanks again for your help.

 

It's odd that you have to do that... and you obviously shouldn't have to "waste" a gauge like that... doesn't need it on the R50/52/53... I don't understand why the R55/56 is different in this regard...

 

Well in thinking about this since you use an SCII as well it doesn't seem that the fault lies with it. Must be a difference in the info presented by the OBD in the different versions. My programming background makes me think that in order for the SC II to modify the MAP values to present approx boost, the OBD must be told to present the MAP values. Maybe they are not available in an R56 unless they are displayed.

 

Well, that's what the XGauge does (or is supposed to do)... it reads the data directly off the OBD bus (not out of the SGII's memory) and then does calculations on it... and the car doesn't know what you're displaying on your SG, it just puts data on the bus in response to requests... So I'm pretty perplexed.

 

Then that makes two of us, my friend.