A Strange Boost Issue Noticed While On A Spirited Drive Yesterday...

[S3 Paul]

While on a bit of a random road trip yesterday a few of us decided to go to Skegness for fish and chips...
While on route there was a couple of moments when i was on the throttle then backed off for a split second then back on the gas only to feel no boost for a second or so... while this happened the boost gauge showed vacume rather than boost, But then like somebody flipping a switch.... full boost again,
Not realy a massive problem but would like to know what is wrong/ failing??

 

[jojo]

Vacuum leak, MAF Sensor, knackered DV?

Best to do a scan and some logging with Vagcom to see what comes up first.

 

[S3 Paul]

I scanned the car on returning home but no faults found.
What blocks if logged would show something untowards?

 

[jojo]

I scanned the car on returning home but no faults found.
What blocks if logged would show something untowards?

Here you go Paul.

http://www.audi-sport.net/vb/a3-s3-forum-8l-chassis/99273-how-log-vag-com.html

 

[S3 TAM]

Sounds like high EGT's and the ecu is dumping loads of fuel in and cutting boost.

FMIC should solve this.

I might be well off tho. Just sounds like an issue i have/had.

 

[<tuffty/>]

What boost did it show prior to the cut? I have had this when I had a boost pike shortly after changing my FMIC... it was hitting 2bar at the time of course but sounds like the ECU pulling back the throttle...

<tuffty/>

 

[S3 Paul]

I have a FMIC for around a year now too,
Erm the car runs 20 to 22 psi unless its very hot then 19 to 20
The needle just sat in the vacume area then after about a second was back to 20 psi
The car did feel like it held back too. So i know it wasnt a sticky gauge.
Not a major issue on its own but if its an indication something isnt right... i would love to track it down.