Disco 2 Waste gate modulator bypass good or bad idea?

Simon Perks · Jul 8, 2022

Is this a good idea? Anyone know why the Defender TD5 doesn't have one?
Point is it seems i am losing some pressure resulting in sloppy performance and I have read that you can just bypass it without causing other issues.

Alpine greetings

Simon

sierrafery · Jul 8, 2022

If you want your D2 to run with less low end power, slower acceleration and lower boost on kick down then simply bypass it.... though if you are loosing pressure and have performance issues that's not caused by the modulator, that one would cause overboost so better find and fix the boost leak rather than downgrade your D2. The defender doesnt have it but it has a different fuel map, IMO not a good ideea at all to bypass it on the D2 for other than for diagnostic reasons, just a bodge

Nellysubsea · Jul 24, 2022

Has your sloppy performance always been there or is it more of recent thing?
I purchased my TD5 D2 auto and it ran very poorly, checked all the vacuum hoses to see if they were perished, check the waste gate valve was functioning, cleaned the MAF & MAS, found the oil in the ECU connector so replaced the injector wiring harness & replaced the waste gate control valve, things were better but nothing like it should of been. Checked the waste gate actuator setting and it was around 19 threads, so it was never really opening the waste gate. Adjusted it to around 11 threads from the start of the threads to the lock nut and it runs decent now. Nothing new here, just a recap of some things to look at

Simon Perks · Jul 25, 2022

Nellysubsea said:
Has your sloppy performance always been there or is it more of recent thing?
I purchased my TD5 D2 auto and it ran very poorly, checked all the vacuum hoses to see if they were perished, check the waste gate valve was functioning, cleaned the MAF & MAS, found the oil in the ECU connector so replaced the injector wiring harness & replaced the waste gate control valve, things were better but nothing like it should of been. Checked the waste gate actuator setting and it was around 19 threads, so it was never really opening the waste gate. Adjusted it to around 11 threads from the start of the threads to the lock nut and it runs decent now. Nothing new here, just a recap of some things to look at

For me it seems it got worse after the head gasket change having sat at an elevated angle for a couple of weeks, turned out it needed ATF fluid which improved it some what, then i replaced the modulator and the actuator but didn't really take a note of where the waste gate lever was set at.
Yes it made a big difference though, earlier gear changes and way smoother.
I haven't checked the injector loom yet and i will take your advice about the threads.
Next stop front hubs and CV joints

Simon up the Alp

Simon Perks · Aug 2, 2022

Nellysubsea said:
Adjusted it to around 11 threads from the start of the threads to the lock nut and it runs decent now. Nothing new here, just a recap of some things to look at

Might sound silly but starting from which end?

Nellysubsea · Aug 2, 2022

I took it from the start of the threads from the actuator end to the lock nut

Keith_L · Aug 2, 2022

Does this help?

sierrafery · Aug 2, 2022

Simon Perks said:
Might sound silly but starting from which end?

from the only one end where you can count the threads

Simon Perks · Aug 2, 2022

Thanks Chaps .. got it ...

Disco 2 Waste gate modulator bypass good or bad idea?

Simon Perks

Active Member

sierrafery

Well-Known Member

Nellysubsea

Member

Simon Perks

Active Member

Simon Perks

Active Member

Nellysubsea

Member

Keith_L

Well-Known Member

Attachments

sierrafery

Well-Known Member

Simon Perks

Active Member

Similar threads