[Dazza335iC]

Is there a way to monitor actual boost vs requested boost while driving? I suspect I may have a boost leak around the fitting where the post-IC pipe meets up with the throttle body, but obviously pulling that fitting off and testing for boost leaks old-school style won't help me. Can Torque Pro or Carly monitor those parameters?

[WreckerX5d]

I believe it's easier to just replace the seal that tends to go bad.

[Hoooper]

I can do it with bavtech tool. I would guess you could do it with torque or Carly also.

it's not reliable. i had boost leaks one at that red pipe and one at the other aluminium pipe, and both times, not showing nothing on diagnostics...i was told the sensor was just before the hole...obviously bmw didn't have that right....oh and even when your turbo is gone, diagnostics will supposedly not show it...i wonder if it is with new cars the same story...coz i was amazed to find out these things won't show on my car..another disappointment among many

[Hoooper]

Originally Posted by Martin80k

it's not reliable. i had boost leaks one at that red pipe and one at the other aluminium pipe, and both times, not showing nothing on diagnostics...i was told the sensor was just before the hole...obviously bmw didn't have that right....oh and even when your turbo is gone, diagnostics will supposedly not show it...i wonder if it is with new cars the same story...coz i was amazed to find out these things won't show on my car..another disappointment among many

The pressure sensor is in the intake manifold so whoever told you that is full of crap. Normally for a small leak at the red pipe you won't get a code because the deviation is not high enough, if you had a big leak there a code would pop up.

[Bob@BPC]

Take it to a local shop and have it smoke tested, fastest way to find a boost leak.

[Dazza335iC]

Originally Posted by Hoooper

I can do it with bavtech tool. I would guess you could do it with torque or Carly also.

Good to know, I think I have a friend with that.

Originally Posted by Bob@BPC

Take it to a local shop and have it smoke tested, fastest way to find a boost leak.

I had thought of that, but it seems like it would be hard to get any smoke tester to actually put pressure in to the intake system. Most leaks won't show at 0.01psi or whatever a smoke tester puts out. If, for example, a seal is going bad and 5psi is enough to push it out of shape and cause a leak, it wouldn't be seen on a smoke test.

[ingenieur]

Originally Posted by Hoooper

The pressure sensor is in the intake manifold so whoever told you that is full of crap. Normally for a small leak at the red pipe you won't get a code because the deviation is not high enough, if you had a big leak there a code would pop up.

Correct - for a leak on the charge air side - the measured air flow by the HFM may exceed the calculated rate, but not enough to set a fault until the threshold deviation is exceeded. Missing or leaking O-ring, small hole in cooler - maybe no fault -but this can cause an increase in EGR rate and smoke.