Thread: Turbo Boost PSI
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      08-28-2011, 09:10 PM   #32
RiXst3r's Avatar

Drives: M235i
Join Date: Sep 2006
Location: Ohio

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Can't use a generic obd gauge to read boost on the n54... The map sensor on the manifold of the n54 is only good for 3.3psi or so... the 17 you see is not subtracting ambient pressure of 14.5(or so).... The T-map sensor before the throttle measure up to 22psi, the ECU reads both these and does a blend of the data.

On the n54 it's best to use a vacuum driven sensor (which is what we use for the gauge for the n54 and 1M)... otherwise you won't see vacuum and the throttle plate will create spikes to the sensor that are never seen in the manifold... makes for crappy peak recall!

The n55 on the other hand has a 22psi capable sensor on the manifold so obd data will show actual full boost.

We've sold a few gauges to 1M users... I am assuming they have been running them and should be able to report back actual boost,egt,coolant temp,AIT,0-60 times, etc... all the stuff the P3 gauge reads.


Originally Posted by KIYO View Post
I have done only 100km with my 1M so I have not yet done a full throttle but I have seen 105kPa (15.22PSI) with the ScanGaugeII connected to my 1M. That is about 1bar.

The picture is when idle.