Post ECU upgrade boost leak???

[shimee]

Thanks for the reply. If it is the case then its an unusual system - I can spin up the wheels without intervention 90% of the time, its just this drastic power drop on occasion. Not just the sound is new, the power drop is new. Could be due to the increased power of the car I guess....
If its ESP its kicking in way too prematurely and interfering with, ahem, normal driving.

Will switch off and test it out tonight...should be fun.

This is merely the ESP system cutting in. The exhaust flutter is more noticeable, though, because you're now using a louder system. Try switching off the ESP and the sound should go away, meaning you'll wheelspin/axle tramp with flaring revs instead. It's still apparent on a standard car, but far quieter.

[BLAKROC]

Mine does exactly the same when giving it WOT, it's ESP kicking in. Makes some fun pops/farts when it does it though, like a machine gun? Turning ESP off will almost certainly solve this but you'll get the subsequent wheel spin as previously mentioned.

Thanks for the reply. If it is the case then its an unusual system - I can spin up the wheels without intervention 90% of the time, its just this drastic power drop on occasion. Not just the sound is new, the power drop is new. Could be due to the increased power of the car I guess....
If its ESP its kicking in way too prematurely and interfering with, ahem, normal driving.

Will switch off and test it out tonight...should be fun.

[BLAKROC]

In response to the OP I'd guess it's the diverter valve too. I've had no trouble with mine so far, but had the exact same situation when I put stage 1 on the old Polo 1.8T. Solved it with the R1 Diverter valve from APR instantly (plus a larger diameter air intake to let it all breath better - seat pd160 for the polo), as it would hold the increased boost compared to the stock one.

There should be quite a few DV options out there for the Roc R.

[h100vw]

Thats not how the PCV works on TFSI engines , its the other way around ..

Must have misread it then. Apologies if I have lead anyone astray.

Gavin

[BoschAutoShop]

Thanks for the reply. If it is the case then its an unusual system - I can spin up the wheels without intervention 90% of the time, its just this drastic power drop on occasion. Not just the sound is new, the power drop is new. Could be due to the increased power of the car I guess....
If its ESP its kicking in way too prematurely and interfering with, ahem, normal driving.

Will switch off and test it out tonight...should be fun.

There are literally thousands of input condition variations that will directly influence the Bosch ESP system, so it will always intervene differently and with varying severity, just as the nature of your engine output will change, based on the way the ECU interprets the conditions. There are so many different factors measured in micro-seconds that it's impossible to identify a standard reaction.

[Scuby_snax84]

Sounds a bit like the "flutter".

Try and google search "k04 Flutter" and you'll see just how many people have this. There has been many a debate whether it is infact compressor surge or the wastegate actuator not being strong enough to hold the high boost requests therefore opening and shutting. My car flutters all the time if you boot it in a higher gear at lower rpm (like Tim said).