Snicko doing the NADS

[big_fletch]

The Dawes Valve is unique to TDi cars with Vacuum Controlled Nozzle Actuators and works in a similar way to a Ball Valve, but without the vent hole to release pressure for the Wastegate. Manual boost control is achieved by bypassing the ECU controlled Solenoid Valve to have total control via a Needle Valve from inside the vehicle. The Needle Valve controls the rate of turbo spool and the TDi Dawes Valve controls maximum boost to a moderate 18psi at full throttle and 4000rpm.
This system eliminates boost spikes to over 25psi as well as boost fluctuations for EGR, which helps to maintain lower EGT's by having constant boost levels at lower pressures.

I think lol

Basically spot on mate hahaha

[Chaz]

Sorry to hijack the thread, two questions if I may:
1.) Can somebody explain the purpose of the dawes valve?
2.) Is the EGR blocking plate difficult to make? I was thinking of using the gasket as a template and making a plate out of 3mm plate steel?

3mm plate is way too thick. The original gasket is stainless and less than 1mm, so if you use steel you'd be ok with 1mm thick. If you go too thick, the flange won't line up and you'll need to undo the bottom flange at the EGR valve to get the top to mate up.

[Chaz]

The Dawes Valve is unique to TDi cars with Vacuum Controlled Nozzle Actuators and works in a similar way to a Ball Valve, but without the vent hole to release pressure for the Wastegate. Manual boost control is achieved by bypassing the ECU controlled Solenoid Valve to have total control via a Needle Valve from inside the vehicle. The Needle Valve controls the rate of turbo spool and the TDi Dawes Valve controls maximum boost to a moderate 18psi at full throttle and 4000rpm.
This system eliminates boost spikes to over 25psi as well as boost fluctuations for EGR, which helps to maintain lower EGT's by having constant boost levels at lower pressures.

I think lol

X2, I would have said something similar........haha!

[snicko]

Well tomorrow is the day..............the poor mechanic!!.........hahahahahahaha

I am a bit nervous tho as he hasn't done any of this before so I have been searching on here for advice that has been given.
I can not find if anyone has put up pics as to plumbing in the Provent 200 catch can?? I got the can but no hoses or instructions came with it. HELP!!

[Silver]

Well tomorrow is the day..............the poor mechanic!!.........hahahahahahaha

I am a bit nervous tho as he hasn't done any of this before so I have been searching on here for advice that has been given.
I can not find if anyone has put up pics as to plumbing in the Provent 200 catch can?? I got the can but no hoses or instructions came with it. HELP!!

Good luck and have fun Snicko!

[timbar]

Good Luck S N I C KO hope all goes well for you

[snicko]

Today was the day. The whole reason I ended up on this forum - Over boosting and needed to do the NADS

My mechanic was excellent. He was very patient answering my questions - Whats that?? What does it do etc............hahaha
The guys in the workshop were on there best behaviour. Until I had a piece of 2'' hose 200mm long on a slight bend in my hand! and I said this is huge!!............my poor mechanic couldn't control himself and laughed and laughed!! I mean what could I say after that????

My job was to hold the light!! and the only other thing I did was put the nut on the intercooler cover!!

We cleaned out the top thingy - YUCK



YUCK again



Stuff pulled of ready to do the next bit



Dawes valve fitted



Hose fitted to boost gauge and other tingy


Red hoses are for the catch can (pretty arn't they??)
All put back together



After all was done we took it for a test drive. Seemed all good but the pyro guage was a bit high so need to take it back and tweak it.

Was a great day and thanks to my patient mechanic I now know lots more.

[belzi82]

Love your work Snicko, all the 'thingy's' look great!!!!

[snicko]

Love your work Snicko, all the 'thingy's' look great!!!!

Thanks Bel that's what I call them too!!............hahahahaha

[big_fletch]

Nice work there snicko, looks good with the red hoses.. Very 'Sporty' lol