Thread: How To: Adjust TD5 Boost Pressure.

Not that I would really care too much, but would doing this effect the fuel economy much?

Depends how far you now plant your right foot mate!

Originally Posted by stig0000

Yes. The tdi is the same deal. But the wast gate for the 300 is a buger to grt to. The 200 tdi is very easy to get to. But on a tdi you need a boost gadge.

As for the post on td5 ecu. Yes both do montor the boost. But only the d2 actuly controls the boost.

Still does not make any sense to me, how can the Defender stop it self overboosting if it has no control from the ECU

Originally Posted by Urban Panzer

Still does not make any sense to me, how can the Defender stop it self overboosting if it has no control from the ECU

both cars stop over boosting buy cutting fuel,

but the d2 can actually adjust the wastegate on the turbo as well, dose that make more sense

def- mechanical,

d2- mechanical with electronic adjustment

Originally Posted by stig0000

both cars stop over boosting buy cutting fuel,

but the d2 can actually adjust the wastegate on the turbo as well, dose that make more sense

def- mechanical,

d2- mechanical with electronic adjustment

Thanks stig0000 adjusted the boost on the 90 today to 1.3 bar, that with the exhaust modification (lost front muffler) and no egr have made a nice change in the performance and it spools up much better. No WRX, but it is lots better.

Allan

Just to clarify the operation of the modulator, in a STD wastegate the actuator will act according to the pressure rise from the turbo and at a speed according to the rise rate.
With the modulator, instead of the full pressure rise being applied to the wastegate, the modulator recieves a series of variable pulses from the ECU which regulates the actuation of the wastegate allowing for boost to develop for longer, basically delaying the speed at which it actuates or letting it go thru full rate.
The ECU watches the rise rate via the boost sensor and responds by deciding the best rate of pulses to be applied.
On a D2 you can bypass the modulator, but it will affect to speed and will dump exhaust pressure quicker.
Personally I wouldn't bypass it if you have a D2.

Cheers


Andrew

It works reeeeeeeel well on a Defender.Tried it on the freeway this morning and from 90-100 kmh its not the same car. Son thinks it will stay with his D3 from 100 up. Don't know about that but a vast improvement, less lag, and a much nicer vehicle to drive, very happy.

Allan

Wate untill you get a big chip.. it will leave the d3 for dead every were. Trust me i no