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Naf

Member Since: 07 Dec 2016
Location: Sandbox
Posts: 412

2000 Defender 130 Td5 HCPU Nato Green No Canopy

Vnt or twin turbo

So, i have been googlin for the past few days and i found two turbo setups that have me excited...

Both are from bmws, one is a GTB2260V single turbo from a x5 3.0 Diesel, and the other is a twin turbo setup from a Sedan 3.5D.

Either way i have to make a custom exhaust manifold.

But the VNT turbo, i will need to buy the Digiboost controller, and electronic to vacuum conversion kit.

I feel both kits will be a challenge to install, but fun to drive...

Thoughts

7th Jul 2017 3:43am

Naf

Member Since: 07 Dec 2016
Location: Sandbox
Posts: 412

Forgot to mention, investment is about the same.

The vnt turbo plus digiboost is about the same price as the twin turbo setup.

I will also upgrade the billet compressor impeller for either setup to help reduce lag.

7th Jul 2017 4:42am

termohe

Member Since: 23 Jul 2012
Location: De Pinte
Posts: 15

Why would you need a digiboost box?

7th Jul 2017 8:16am

Naf

Member Since: 07 Dec 2016
Location: Sandbox
Posts: 412

To control the vnt vacuum actuator

The vnt is controlled via vacuum and not boost. There may be a way for me to swap the vacuum for a boost, but that needs more google time

7th Jul 2017 8:21am

termohe

Member Since: 23 Jul 2012
Location: De Pinte
Posts: 15

I have a VNT but no digiboost, just a VW sensor on the inlet collector and a good remap

7th Jul 2017 8:52am

Naf

Member Since: 07 Dec 2016
Location: Sandbox
Posts: 412

Plz explain your vw sensor...How does it control the vnt at low and high rpms?

7th Jul 2017 9:37am

termohe

Member Since: 23 Jul 2012
Location: De Pinte
Posts: 15

the VNT I have is from BAS (TurboTechnics)
As your VNT gives more air, you get more pressure at the inlet, more than the the sensor can handle so the ecu goes in limp mode.

VW makes sensors with a wider range and together with a good remap the ecu handles the higher pressures correctly. So no need to install these boostboxes that reduce the voltage signal going to the ecu

7th Jul 2017 9:48am

Naf

Member Since: 07 Dec 2016
Location: Sandbox
Posts: 412

Have alive's map sensor. Its a bosch.

What vnt did you get?

7th Jul 2017 11:56am

termohe

Member Since: 23 Jul 2012
Location: De Pinte
Posts: 15

termohe wrote:
the VNT I have is from BAS (TurboTechnics)

7th Jul 2017 12:09pm

Naf

Member Since: 07 Dec 2016
Location: Sandbox
Posts: 412

I got that, just thought you knew the turbo model you had.

Will guess its a gt2052v.

7th Jul 2017 1:07pm

Naf

Member Since: 07 Dec 2016
Location: Sandbox
Posts: 412

Interestin find, seems i could use the boost actuator from my td5 to control the vanes.

So no need vacuum to control.

7th Jul 2017 1:38pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4785

Turbo technics make a VNT that bolts directly to the td5 manifold and already has an actuator fit for boost pressure control.

I have one on my td5 and it's great

2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton

7th Jul 2017 4:17pm

derbywill

Member Since: 25 Mar 2010
Location: Derbyshire
Posts: 556

Do you guys find the turbotechnics Vnt whistles when boosting?
Also which Vw sensor is required the eliminate the boost box? Do alive do a air flow meter that can cope with more flow?

Cheers

Will 2005 90 XS
1954 86'' Series 1 tilt
1968 88” 2A 200tdi
2002 110 Hardtop

7th Jul 2017 4:41pm

Naf

Member Since: 07 Dec 2016
Location: Sandbox
Posts: 412

Ok, so its a simple wastegate swap.

I am lookin for a little bigger turbo, thats why i am goin with the 2260 vs the 2052 which everyone is runnin. Should give me better turbo efficiency and keep some more on the table for later.

Alive make the new modified map sensor to help with the overboost.

So question still hasnt been answered, vnt turbo or twin?

Vnt will be less work with more space, and the twin more work with less space...

Twin has its benefits and so does vnt.

The twin has a one smaller turbo which should spool up quick givin me boost as low as 1500 and a larger one to carry the boost till redline.

The vnt is a mid sized turbo that should spool up faster and keep the pressure on till about redline.

Using the wastegate actuator has it where the vnt should force the vanes to accelerate the exhaust to spin it faster at 0 boost and once i get to my boosted pressure it will open the vanes slowin the flow and also reducin the boost...

Only problem is the failsafe is mox boost, where the vacuum is 0 boost

7th Jul 2017 4:56pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4785

My VNT comes on boost at around 1500 rpm and pulls hard all the way to the governor. Unless a twin turbo came on boost at 1100 rpm or less I think the additional complexity and fabrication required just wouldn't be worth it. 2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton

7th Jul 2017 5:01pm

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