[hifidawg09]

Guys at idle Cobb boost reads -12psi (engine is pulling a vacuum)
Under 4-5k rpm I get a reading of -6.1psi.
The car is pulling fine and feels like a lot more than +6psi of boost.
What is the deal? Is it likely that my TMAP sensor is dead?
Can I save it by cleaning it? I don't think I have a leak since I am not getting codes for that.
I think the 2nd MAP sensor (at the intake manifold) is making the car derivable.

Tomorrow I will test my theory and pick up a TMAP at the dealer.

Let me know what you think.

[Aqid]

Mine did the same in Torque, but I thought that was just Torque's problem. I have yet to purchase the logging module of MHD, when I do I'm going to try that to see what's up. Car pulls great tho, no complaints at all.

[Flex68]

How does it drive ???? ....

I was having sluggish slow spool issues so I cleaned tmap sensor etc and seems kinda pulls better

[LGCubana]

Same here, Torque shows -6psi at idle on my friend's '08, e92.

But on my '11 N55, e90 the boost reading is accurate

Originally Posted by Aqid

Mine did the same in Torque, but I thought that was just Torque's problem. I have yet to purchase the logging module of MHD, when I do I'm going to try that to see what's up. Car pulls great tho, no complaints at all.

[hifidawg09]

So could this be a COBB issue and the TMAP is fine?

[LGCubana]

Not if you read all 4 posts: 1 COBB, 1 MHD & 1 stock

Originally Posted by hifidawg09

So could this be a COBB issue and the TMAP is fine?

[hifidawg09]

So it looks like I am not the only one with getting an error reading boost. If the TMAP was bad I think that my car would throw codes and not run. I can try to re-flash back to stock and then put Cobb back on. I really do not want to buy a new TMAP just to find out that that it was fine in the first place.

[Mike@N54Tuning.com]

Originally Posted by hifidawg09

So it looks like I am not the only one with getting an error reading boost. If the TMAP was bad I think that my car would throw codes and not run. I can try to re-flash back to stock and then put Cobb back on. I really do not want to buy a new TMAP just to find out that that it was fine in the first place.

A bad TMAP would most likely throw a code / under / over boost or a voltage code on the sensor.

Mike

[hifidawg09]

Good point Mike. So what's the deal with the Cobb boost parameter measurement? Not sure what the issue is other than the Access Port not reading/computing the value correctly. How can I be making -6PSI when the car going like a raped ape

I am trying INPA today. But I am not sure I can read the MAP/TMAP sensors directly with INPA. Also sucks that all the labels are in German. Half the time I am guessing what the F I am looking at.

Originally Posted by Mike@N54Tuning.com

A bad TMAP would most likely throw a code / under / over boost or a voltage code on the sensor.

Mike

[BMWhoarder]

Do you have a jb4 installed as well?

[hifidawg09]

I don't think so. But even if I did the boost reading would not be screwed up this much.
I am calling Cobb today to see if they can shed some light on this. Holding off on ordering a TMAP.

[hifidawg09]

Cobb thinks its a AP firmware bug. They claim they never seen it before.
Looks like my N54 is just a bit special. Will update once they release a patch.
Not sure if they ever will but here is to hoping.