Turbo boost pressure

[ManofKent]

I have just acquired an icarsoft code reader.
The live data available is just amazing.
But I don't really know what is a satisfactory reading on some things.
Take the turbo boost pressure for example.
At 3000 rpm I record a boost pressure of 1600 to 1700 millibars.
1020 at idle.
The car is an e 220 cdi.
I am just curious. Is this boost pressure about what I should expect to see?

Thanks

 

[PobodY]

Is that absolute manifold pressure rather than boost pressure? - Surely ~1bar is atmospheric pressure, so it's actually 0.6-0.7 bar (relative) at 3000rpm.

I have no idea about diesel turbos, but the Nissan makes about the same boost at 3000rpm, and peaks at 1.1bar after ~5000rpm.

 

[ManofKent]

Thanks PobodY.
Yes atmospheric is about 1 bar, which is sort of the tick over pressure.
I don't know where the sensor is that measures this - icarsoft describes it as boost pressure.

Further Google searches suggest a car turbo boosts to about 7 psi, which is just under .5 bar, so I guess my old turbo is still doing OK.

John

 

[OneForTheRoad]

If the pressure deviates from normal limits. Believe me the car will let you know...

 

[Trickythemerc]

The last time my Sprinter showed boost pressure deviation from normal limits it actually translated to minus £1500.00

 

[Bellow]

At 3000 rpm I record a boost pressure of 1600 to 1700 millibars.

Is that 'no load' 3000rpm or when driving?
Pulling hard, I'd expect much higher with a diesel - circa 3bar boost (4bar absolute).

 

[ManofKent]

Hi Bellow.
That's no load, just revving the engine.

 

[Bellow]

Hi Bellow.
That's no load, just revving the engine.

That's what I thought.
Boosting at 0.6 to 0.7bar under load rather than 3bar - the car would be gutless.
Modern day diesels need their boost - and lots of it!