Anyone done yet ?

Our KJ's come with a vacuum operated boost control fixed to the actuator right ? I noticed that just underneath the actuator there is a little adjusting nut thingy ?, fixed to the shaft that goes from the actuator to the internal wastegate.

You have to remove the radiator overflow bottle and factory heat shield to see it/get to it.

Anyone played with it yet ?

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Custom, Comfortable & Capable.......just the way it should be

You first!

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Feb/2006 Silver Sport 4x4 CRD

I see.......

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Custom, Comfortable & Capable.......just the way it should be

It is controled by a computer chip, you can pay some big bucks to get it tweaked. But you just can't pull it open like you have talked about, it has to be a controlled process so as not to blow your engine or turbo.

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91 MB 300D 2.5L Turbo. Her's

05 MB E320 CDI. Mine

Most ( not all ) "variable vane/nozzle" turbos do not have a "wastegate" like you are thinking. Since the vanes/nozzles change pitch/volume, it takes care of itself for the most part. You can have a watsegate on a VVT/VNT to protect it at top boost but it is controlled electronically for the most part. So as oldnavy said, you need something like InMotion Tuning to do a custom computer upgrade to dial in your turbo boost.

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Founder of L.O.S.T.
2006 CRD Sport
Mods: GDE Hot Tune w/ 364#@2000rpm/Air Box /3" Str8 Exhaust/ASFIR Alum Skids/245-75R-16 Cooper STT PRO/OME LIFT w/Clevis & 4 Spring Isos/AirTabs/Rigid 10" S2 LED/4xGuard Ctr Matrix Bumper
Drag Strip:Reac=.1078_60ft=2.224_1/8=10.39@64.8mph_1/4+16.46@80.8mph

Bad move. That rod controls the variable pitch of the turbine blades and is adjusted to the range of motion of the vaccuum pot that is controlling this mechanism. There is no wastegate.

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2005 Liberty Sport CRD, Lt Khaki, sunroof

Thankful to now be an EX-CRD owner.

I guess I will echo what everyone else is saying....and I will add that even if you could make some type of manual adjustment, it would throw a CEL for an overboost condition since the amount of boost would be out of the range that the ECM is expecting. In short, bad idea to try and adjust it manually and as everyone else has stated this would need to be done with a chip tune.

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06.5 Jetta TDI PKG 2 - Silver/Anth

Good info, thanks guys.

I still dont understand the "no wastegate" comment ? I thought every turbo has a waste gate to relief backpressure ie boost (or overboost)

I've heard a million times a wastegate style noise coming from under my bonnet, I would swear it black and blue.

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Custom, Comfortable & Capable.......just the way it should be

Someone will correct me if I am wrong, but this is the difference. Older turbos had a wastegate that would open to, as you said, release excess boost. The new VVT turbos have an actuator that operates several vanes to control boost.

See more on turbos here:

http://en.wikipedia.org/wiki/Variable_g ... rbocharger

http://en.wikipedia.org/wiki/Turbo

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06.5 Jetta TDI PKG 2 - Silver/Anth

My 92 6 liter Cummins ain't got no waste gate. Neither does my wifes 06 Libby.

For different reasons, obviously.

The VVT (Variable Vane Turbo) or VGT (Variable Geometry Turbo) Does what was stated earlier and, takes care of itself. Meaning, if the ECM senses the need for more boost, then it physically changes the impeller blades in the turbo to produce more boost. if it senses it needs less, it changes to produce less.

And as far as wastegates go. They are really nothing more than a fancy name for a pressure relief valve. Meaning, if you produce too much pressure (boost) they will release excess pressure back to a "safe" pressure.

Now, the reason my 92 Cummins don't have/need a WG is because it was designed to really never need it. No matter the amount of fuel being dumped, it should never overboost.

The Libby, of course has the VVT which is controled by the ECM. so it should never overboost either. Hence no need for a wastegate.

I'm hoping this makes sense after 7 Budweisers!
Someone correct me if I'm wrong.

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Murf

92 W250, Cummins powered (mine)

06 Liberty Sport 4x4 (hers)

If mess with the actuator rod length, you may possibly get a check engine light or go into limp mode if the sophisticated electronics determine that boost is outside of an expected variable. This is a theory andI can could be wrong.

The turbos employed in the CRD are supplied by Garrett which was purchased by Honeywell.
Plenty of technical reading at the following site. It's good tutorials. http://www.turbobygarrett.com/turbobygarrett/tech_center/tech_center.html

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2005 Black CRD Limited w/105,000 miles
Mann Provent 200, Airbox Mod, ORM Mod
New 545RFE, TC & Redesigned pump @ 25,020 miles
New EGR Flow Control Valve @ 25,020 miles
New Transfer Case input/output seals @ 32,787 miles
SEGR Kit @ 52,000 miles
SunCoast TC and Transgo Shift Kit @ 52,000 miles

Basically, there is very little on new cars that you can fool with or adjust without having a CEL or some other malfunction. Mine has plenty of power for my liking and I don't want to take a chance on the warranty so I will leave mine alone.

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06.5 Jetta TDI PKG 2 - Silver/Anth

Curious actually how many inches of pressure the Turbo actually raises over ambient pressure when at max boost.
Anbody has the specs from manual maybe ?.

-Gab

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2006 CRD Limited, Manfufactured Dec 13/05

It's about 25psi.