[Aramis]

Hello!

So about a year ago i had my turbo replaced for a remanufactured one and it pretty much “blew” after 6 months. It was repaired but i was curious wheter it should boost at idle? I had my remap removed at the time to diagnose what it could be. Without the remap, the rubber hose between IC and intake manifold was under pressure (at idle). But after i had my remap put back i can’t tell if it is boosting. The turbo whistle itself can’t be heard from the exhaust, only when the compressor slows down (i have a straight pipe) But while driving it boosts no issues. Is the turbo supposed to act different while not in motion or is it just a thing that might of been adjusted with a tune?

[lnxguy]

Why would you expect the turbo to make boost at idle?

[Aramis]

Originally Posted by lnxguy

Why would you expect the turbo to make boost at idle?

Shouldn’t it make some boost at idle? Just enough to pressurize the hoses. I’ve had a mechanic look at it, but he has an older version of the M57 with a vaccum controlled turbo. His hose, mentioned above, even expands while revving. No difference in mine

[T-Dubbs]

there should be zero boost at idle

[Aramis]

Originally Posted by T-Dubbs

there should be zero boost at idle

Makes sense, but what about revving while in neutral and stationary?

[lnxguy]

Originally Posted by Aramis

Makes sense, but what about revving while in neutral and stationary?

Not going to make much boost (if any at all) while revving in neutral. You need load on the engine to make power.

[Aramis]

Originally Posted by lnxguy

Not going to make much boost (if any at all) while revving in neutral. You need load on the engine to make power.

Interesting, that would contradict why would the intake hoses pressurize with a stock tune, weird

[lnxguy]

Originally Posted by Aramis

Interesting, that would contradict why would the intake hoses pressurize with a stock tune, weird

Even 1-2psi will pressurize the system. But it's not like 1-2psi is going to do anything.

[335dlci]

Oh wow

[nonford]

Boost at idle, interesting concept!!!! Boost under load I understand, you may register boost wild idling, but you need a very delicate measurement device....

[Aramis]

Originally Posted by nonford

Boost at idle, interesting concept!!!! Boost under load I understand, you may register boost wild idling, but you need a very delicate measurement device....

Maybe i explained the idea in wrong words, since english is not my first language. But what i can’t wrap my head around is why is the intake hose is stiff and under pressure without a remap (at idle). After the remap you can’t feel any resistance while squeezing it

[lnxguy]

Originally Posted by Aramis

Maybe i explained the idea in wrong words, since english is not my first language. But what i can’t wrap my head around is why is the intake hose is stiff and under pressure without a remap (at idle). After the remap you can’t feel any resistance while squeezing it

Single turbo correct? VNT? Maybe the stock tune as the vanes completely closed at idle and the remap doesn't?