How To: Adjust TD5 Boost Pressure.

It's smokin

I left the heat shield off my TD5 and set the soundproofing on the bonnet alight.[bigwhistle] I would not recommend leaving it off.:rulez:
I'm going out now to wind up the boost, catch ya.[smilebigeye]

Mike

Quote:

Originally Posted by PhilipA

The D2 EU3 wastegate modulator stops the valve to the wastegate from opening under 15PSI but from there on the valve is open and the physical wastegate diaphragm position and the flap position determines how much boost is available.
I understand from Offtrack that its operation is more complex than that but the net result is that the modulator stops wastegate "creep" at low boost levels and so increases boost at any position under about 15PSI compared with having no modulator like a Defender.
I have my screw adjustment wound up to about 9 turns and the boost transition is seamless up to 20PSI on my gauge positioned near the MAP sensor. Car is 2002 TD5 Auto EU3.
Regards Philip A

The D2 Td5 uses what is basically an electronic boost controller.
The WGM is used to control the amount of wastegate opening to either increase or reduce boost so that it matches target boost.

When you wind up the wastegate arm to mechanically increase boost the WGM controller sees boost higher than the target level and reduces modulation % which allows more boost to reach the actuator. The net result is the wastegate setting controls boost pressure, and the effectiveness of the "anti-creep" is reduced.

If boost pressure is lower than the pressure that causes the wastegate to begin opening the WGM has no effect. Conversely the WGM can only increase pressure when boost is at a level that would otherwise cause the waste gate to begin opening.

In the last week or so I've posted some information on the WGM controller maps, and I've already has one person report 1.5bar boost with stock rod adjustment. If it's done right you get the benefits of the anti creep along with raised boost.

cheers
Paul

I have a new turbo on my TD5 Defender. It came with 15 threads on wastegate rod from the factory with a white color mark.
the maximum boost I have now is 1.12 bar.
if I adjust the wastegate to 11-13 threads, will this increase the boost?