Boost Gauge/Turbo/TMAP?? - Alfa Romeo Forum
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159SW 1.9JTDM

Boost Gauge/Turbo/TMAP??

Hi guys,

Quick question - I've got a 1.9jtdm and it's being an Alfa.
Can someone have a look and tell me where their boost gauge sits at tickover?
I'm not sure if the VNT vanes are stuck or the TMAP sensor is knackered, I get very little torque low down and then a wallop of power at about 2.5k.
At tickover my boost gauge is showing 0.6bar and I'm sure it didn't used to.
No mods on the car other than an EGR restrictor plate.


MattB159 is offline  
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At idle there is not a lot of exhaust gas to keep turbo spinning, VNT is then at full boost position (so sticking VNT will not be a problem here) and you should get around 1bar absolute pressure (atmospheric pressure) - which shows up as 0 on the gauge.
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I get a similar kick between 2.5 and 3, even after my TMAP was replaced.
0.6 sounds odd though. I'm sure mine is at the first marker (0.2?) at tick-over. I'd love to know what this is as its always annoyed me - I just assumed it was a "feature"
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boost , gauge or turbo or tmap

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