Taking the T out of my TDi

[kaanage]

I was wondering if anyone knew how I could temporarily disable the turbo on my 1.9 PD TDi?

Or is there any possibility of jamming the actuator so the vanes are fully open and the low rpm boost is minimised?

I couldn't find anything on this site for this.

[ffoff]

No idea how to solve your problem but why in the world would you want to drive slower?

[getjet]

Whats the issue mate? Maybe we can help fix the issue so you dont need to do something dodgy?

[Sumodog68]

Struggling to maintain traction ?

[gldgti]

I was wondering if anyone knew how I could temporarily disable the turbo on my 1.9 PD TDi?

Or is there any possibility of jamming the actuator so the vanes are fully open and the low rpm boost is minimised?

I couldn't find anything on this site for this.

kaanage,

The vanes are operated by a vaccuum actuator like a normal turbo, but the vaccuum supply is regulated to adjust the vane position electronically via a solenoid valve.

If you remove the vacuum supply from the actuator (pull the hose off) it ought to spring to the fully open position. (This is where it would be at idle anyway. As soon as you use some accelerator, the ecu should start closing the vanes)

However, I am not sure about what the ECU will do after that. It may continue to work as normal, or throw some kind of fault because boost wont be getting up to what it should.

BIG NOTE: Although I couldnt imagine why, it is I suppose possible that the default position for the actuator is vanes closed. This would seem dangerous to me, however I can't guarantee that its not the case. If it were the case and you have a boost gauge or similar, you should be able to tell simply by free reving the engine at idle without any danger. However, if all went to heck and it overboosted, then the ECU should go into limp mode.

I am pretty sure you should be fine just to disconnect the vacuum though.

[jazd]

Yeah you will be fine to disconnect the vacuum tube or the electrical connection to the N75 solenoid valve.

From the 125kW 2.0L VW self study program document, can't imagine your engine would be any different.

Charge pressure control solenoid valve N75
This valve is installed in the engine compartment, in the vicinity of the turbocharger on the plenum chamber. It supplies the turbocharger's vacuum unit with the vacuum required to adjust the guide vanes.

Effect in the event of failure
When it is not supplied with current, the valve isolates the vacuum unit from the vacuum system. A spring in the vacuum unit moves the adjustment mechanism's linkage in such a way that the turbocharger's guide vanes are positioned to a sharp setting angle (emergency running position). Only a low charge pressure is available at a low engine speed and therefore a low exhaust gas pressure.

[AlexRO]

the diesel peugeot i had before my vw had some issues with solenoids and lines .. (two different "specialists" had opposing views :S ) .. ended up running open boost.. it was fun while the engine lasted lol. might want to get a boost gauge and see whats happening for this diy

[kaanage]

Thanks gldgti and jazd - I'll give it a go

[kaanage]

Last question before I try this on the weekend, do any of you guys think my EGTs may get excessive due to the reduced boost at low rpm?

BIG NOTE: Although I couldnt imagine why, it is I suppose possible that the default position for the actuator is vanes closed. This would seem dangerous to me, however I can't guarantee that its not the case. If it were the case and you have a boost gauge or similar, you should be able to tell simply by free reving the engine at idle without any danger. However, if all went to heck and it overboosted, then the ECU should go into limp mode.

I would have thought that this would "choke" the turbine so the engine would just flatten out even earlier than it does now. At any rate, it should be easy to tell as my off idle response wouldn't change at all if the vanes stay closed. But I won't try to rev it out if this is the case.

[Transporter]

Why doyou need to do that? Just curious that's all.