holding boost

[merrett07]

hi I recently fitted a boost gauge to my car, the car was remapped to run 1.6 bar. 

on acceleration it hit this then backs of to 1.2 bar is this right, could it be faulty map sensor

or down to the map its self thanks

[faboka vrs]

At what rpm is it at 1.2bar? Best would be to use VCDS to log group 11 which is request boost against actual boost.

[merrett07]

its from about 2700 rpm, I will try get my hands on a vcds to see.

Edited 28 August, 2014 by merrett07

[merrett07]

I couldn't get my hands on a vcds, so I did some runs using a snap on souls pro, it was coming back at around, 2635 actual, with occasional boost spike of 2845. I'm guessing these numbers relate to 1.63 bar and 1.84 bar.

I don't now if it's the map sensor, or boost gauge, will have to test a new boost gauge to see

[sepulchrave]

I couldn't get my hands on a vcds, so I did some runs using a snap on souls pro, it was coming back at around, 2635 actual, with occasional boost spike of 2845. I'm guessing these numbers relate to 1.63 bar and 1.84 bar.

I don't now if it's the map sensor, or boost gauge, will have to test a new boost gauge to see

 

No need to guess, you're right, actual is boost PLUS atmospheric pressure, 0000 would be a rock hard vacuum.

[devonutopia]

It should really start cutting back boost from about 4000rpm onwards.

 

Having said that I just looked at one of my logs and the car asks for 2.7 bar right up to 4500rpm+     Mine is a little different though.