Judder and Boost Question

[adam8747]

Ok my car judders when I let the throttle off. It only happens when I have really put my foot down. It feels like the engine is dumping all of the power....Has anyone else had this problem? Have changed the dv could it be a maf problem?

Also I fitted a boost gauge to my car yesterday. Its boosting at 14psi, has it been mapped?

 

[OllieH]

It's hard to tell what you mean by this. Do you mean the car suddenly stops accelerating when you release the pedal, as in like when you hit a puddle of water in the road (quite normal I think, especially if making full boost), or do you mean once you have let the throttle off the car judders, like you're driving across rumble strips??

 

[adam8747]

Sorry this is pretty vague. Yes its a bit like hitting water, just doesnt feel right. As for the boost pressure any ideas?

 

[Welly]

Sorry this is pretty vague.

Ummmmmm, yes it is a bit. For example, how are we supposed to know if:

has it been mapped?

when we don't know vital pieces of information such as what engine it is. A3 or S3? They run at different pressures standard and mapped....