Turbo boost pressures on a Landrover Defender TD5

Hello

Recently, we've purchased a 2002? Defender 110 TD5 "Extreme" as a used car, and subsequent mechanical checks, according to the books, have shown the wastegate to be set incorrectly. IE: It's producing more boost than it should, resulting in a sticky wastegate.

So far, we've found that the vehicle was built 05/2002, TD5 2.5L with a Allied Signal (Garrett) GT20 turbocharger, with the vacuum operated wastegate, not the electronically controlled unit. Engine code is a 15P Landrover "Storm" design, not the later Ford engine.

We're also unsure if the electronics has the modifications that landrover introduced in the MY02 series, improving the low-speed throttle response, to eliminate the jerky power delivery under towing or off-road conditions.

Any help would be greatly appreciated with finding the correct turbo boost pressures.

Thanks
Gary.

Fit a boost gauge then adjust the turbo so that it boosts no more than 1.0 bar at full throttle under load. Any more and the ECU goes to limp mode.

I think you've got it the wrong way around - the sticking wastegate will be causing the overboost situation.Free off the wastegate arm and the overboost will go.Do a search - TD5 overboost has been covered loads of times.The wastegate actuator is operated by the boost pressure,not vacuum.
BTW max boost as seen on Testbook should be no more than 225-230Kpa.