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Defender Td5 with Variable Geometry Turbo


td5_2004

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I can't remember exactly what search command I used - if you use 'variable geometry turbo' or similar, the chances are that the seller knows how much it's worth!

I think I just used 'mercedes turbo' (merc fit lots of thier cars with VNTs these days) or something and looked for a while.

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Si - you wait till we tell Kirsty what you just spent the house money on.

It's fine - I bought it before the offer was accepted! Probably the last Landy part I can buy without SWMBO's pre-approval though :angry:

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Guest diesel_jim

I've been in contact with Owen developments up Oxford way, the chap there is very helpful.

It turns out that that Garrett number (GT2256V VNT) is not only used on the mercedes engine, but also the disco Tdv6!!

but also you have to check the following "there are lots of GT2256V's and although

the performance will be the same the orientation (something you cant change

on a VNT) will change, from vehicle to vehicle"

i assume this means the way that the compressor and exhaust ports are placed. i'll mail him back and find out (and i'd expect that the Tdv6 one is the "electronic" version, not the mechanical one)

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Hi Guys,

You will find that any engineer worth his salt can change the positioning of the compressor and turbine housings quite easily, not rocket science :)

All VVT's are mechanically operated but some (such as the Mercedes Sprinter) have an electronic control in the line to the control capsule, the Merc uses engine Vacuum to operate it and there is an electronic valve controlling this. Again, don't be scared, it is not rocket science!

And I know that most of you can play rockets as well as the rest of us :D:D

Lara.

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Various016.jpg

Various003.jpg

Lara.

OOOh! thats just porn :D ,just when i forgot about seeing the picky of this manifold on Devon4x4s forum it turns up here and gives me sleepless nights again.Who made that manifold? Does anyone make a tubular manifold for a 300.My welding skills are several light years from being able to create something like that :(

Paul B)

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Diesel Jim, thanks for the TDV6 tip, DirtyDiesel I may have you that VNT after all then ;)

All VVT's are mechanically operated but some (such as the Mercedes Sprinter) have an electronic control in the line to the control capsule, the Merc uses engine Vacuum to operate it and there is an electronic valve controlling this.

Lara.

All are mechanically operated yes, but only in the sense that something mechanically controls the pitch of the vanes, Land Rover uses electronic actuators on their modern diesel engines that are unlike the ones you describe above - they do not use an electronic vacuum valve, they use a solenoid to operate the actuator arm, I imagine that the vacuum is measured by a sensor that the ecu interprets the signal from

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Reference the positioning of the inlet and exhaust ports, I found that a ring of bolts could be undone on the inlet turbine and the housing rotated. Not possible for the exhaust turbine apparantly, but then not neccessary either ;)

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Reference the positioning of the inlet and exhaust ports, I found that a ring of bolts could be undone on the inlet turbine and the housing rotated. Not possible for the exhaust turbine apparantly, but then not neccessary either ;)

Correct. They are M5 screws and loctited. I broke 2 screws when removing mine (should have applied some heat first). Fortunately, I could get a left handed drill to extract the broken screws, but had to use heat to break the loctite.

They also use flange sealant similar to loctite which means you can't just loosen the clamp screws and spin the compressor housing.

The compressor housing must be removed and the flanges cleaned up first. Be careful not to damage the small section o-ring, which in my case was stuck to both parts by the flange sealant.

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Diesel Jim, thanks for the TDV6 tip, DirtyDiesel I may have you that VNT after all then ;)

Lewis

Your missing one minor detail....

A TdV6 is a V6 - but only uses one turbo ;) (well in LR applications is does)

It uses a link pipe to link A to B Bank (I think the turbo's on B bank) - but the pipe goes straight into an exhaust inlet on the turbo exhaust housing - thus the exhaust housing has an addtional inlet (not just from the manifold it is directly bolted to - if that makes sense??) - but you could always blank one of the exhaust inlets off.

What you really want to find it the turbo off a BMW Td6 powered RR - which is also the correct type of turbo ;)

Ian

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Hi Marsie,

Manifold was made by me,

Am making a new one for mine as am changing the turbo to a hybrid VV + wastgate unit, :blink::blink:

Not going to sell them but Simon is going to do a feasibility study as soon as he has his fitted and running.

Lewis,

Absolutely right but not hard to get a boost sensitive switch to control the solenoids for you if you want.

Mechanical is better though in my opinion.

Watch this space ;)

Lara.

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Lewis

Your missing one minor detail....

A TdV6 is a V6 - but only uses one turbo ;) (well in LR applications is does)

It uses a link pipe to link A to B Bank (I think the turbo's on B bank) - but the pipe goes straight into an exhaust inlet on the turbo exhaust housing - thus the exhaust housing has an addtional inlet (not just from the manifold it is directly bolted to - if that makes sense??) - but you could always blank one of the exhaust inlets off.

What you really want to find it the turbo off a BMW Td6 powered RR - which is also the correct type of turbo ;)

Ian

I'm not sure whether its my beer addled brain but that felt really patronising :blink:

Since I've been building prototype engines for a few months I had noticed that current production models only have one turbo :rolleyes:

Early development models had the flange for the crossover pipe on the manifold as opposed to on the exhaust side of the turbo as you mention above, like other engines we are working on as I'm sure you are aware

Lewis,

Absolutely right but not hard to get a boost sensitive switch to control the solenoids for you if you want.

Mechanical is better though in my opinion.

Lara.

I wasnt aware that boost sensitive switches were cheaply and readily available, Dans idea was to use a choke cable to operate the control arm

Lewis

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Hi Lewis,

Yes, any electronics catalogue will list 12v adjustable pressure sensing switches, RS for example.

OR Micro Dynamics make one specially for automotive turbo use.

I think Demon Tweeks list them.

Best regards,

Lara.

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