adjusting boost on nissan patrol 3.0 turbo

Submitted: Friday, Jun 10, 2005 at 09:44
ThreadID: 23743 Views:9947 Replies:7 FollowUps:7
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I am looking at buying a nissan patrol 4wd diesel turbo, I would like to hear from modifications people have performed to their car and also has anyone adjusted the boost using a bleed valve etc.


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Reply By: Leroy - Friday, Jun 10, 2005 at 09:50

Friday, Jun 10, 2005 at 09:50
The boost is adjusted by a variable vaine which is controlled by the ECU. You would be better off buying DTronic.

AnswerID: 115188

Reply By: blackwrx - Friday, Jun 10, 2005 at 10:31

Friday, Jun 10, 2005 at 10:31
is the Dtronic like an aftermarket ECU or piggy back?
What is the boost able to be adjusted upto safely? and how much of a power increase does this make to the good old patrol?


AnswerID: 115213

Follow Up By: Leroy - Friday, Jun 10, 2005 at 12:28

Friday, Jun 10, 2005 at 12:28
i cant remember if it goes before or after the ECU. I think the Tunit is a piggy back job and I think the user can change some parrameters. Have a look at the Safari website and look at the figures to see what pwr and torque increases you get. It will bring the turbo on sooner lower down the rpm range also.

FollowupID: 370954

Follow Up By: Member - Glenn D (NSW) - Friday, Jun 10, 2005 at 18:53

Friday, Jun 10, 2005 at 18:53
Mr wrx ,

Just put Dtronic on my truck a while ago and found it a good value for money improvment , given it is only a plug in device.

Unit changes fuel schedualing only.

I am lead to believe the fuel is set up for european emission standards and this chokes the engine low in the rev range.

Boost is pneumaticlly controlled only.

FollowupID: 371016

Reply By: Wizard1 - Friday, Jun 10, 2005 at 10:42

Friday, Jun 10, 2005 at 10:42
Why do you want to adjust the boost? I assme it is to get it to come on earlier...

I have a Prado 3.0 fitted with a Dtronic and the next step is a Boost Control Valve that allows the turbo to come on earlier to improve the bottom end torque and reduce turbo lag. These are fitted at most places that specialise in turbo diesel applications.

If you want to reduce the boost I'd be wondering why?

Prado TD
Gold Coast

AnswerID: 115215

Reply By: blackwrx - Friday, Jun 10, 2005 at 10:45

Friday, Jun 10, 2005 at 10:45
I want to increase the boost, I am wondering what boost they run standard and how much boost they can handle safely?

I know that this will give less lag etc, but surely it gives an overall higher power output aswell.

Has anyone had one on the dyno after performing this modification?

AnswerID: 115217

Follow Up By: Wizard1 - Friday, Jun 10, 2005 at 10:58

Friday, Jun 10, 2005 at 10:58
I think you should seek the advice of experts in this field, such as diesel specialists. As I think what you want to do , as in increasing the boost, may have other issues associated with it.
FollowupID: 370939

Follow Up By: Member - Davoe (Widgiemooltha) - Friday, Jun 10, 2005 at 11:20

Friday, Jun 10, 2005 at 11:20
they already run huge boost I think around 17 how else do you think they get all that power out of a tiny 4 cyl ? to incrase boost would be suicide as it seems they struggle to reliably take standard boost.
FollowupID: 370947

Follow Up By: Outbacktourer - Friday, Jun 10, 2005 at 12:49

Friday, Jun 10, 2005 at 12:49
I agree with Wizard on this one.

FWIW in addition to the level of boost from ECU controlled variable vane Garrett turbothe 3.0Di uses the following technology to produce it's power:

Direct electronic injection
Chain driven double overhead camshafts operating four valves per cylinder (requiring no regular tappet adjustment)
Modulated fire combustion system including exhaust gas recirculation
Lightwight pistons with offset pins

Boost figures should be read in conjunction with compression ratio which in this case is 17.9:1 as opposed to higher figures for older technology units (22.7:1 for the 4.2 TD for instance).
FollowupID: 370963

Reply By: Member - Matt Mu (Perth-WA) - Friday, Jun 10, 2005 at 12:05

Friday, Jun 10, 2005 at 12:05
As others have said it is a variable vane turbo controlled by the ECU, I guess the only way to modify that would be Dtronic or a complete replacement ECU but I doubt Wolf makes one for a diesel.

Its a tad different to hotting up your Rex, look blow off valves here!
Most diesels on the market at the moment are tuned very close to their limit and its only the older wastegate controlled TDs that respone to SLIGHT increase in boost but you also need to increase fueling, exhaust, cool intake charge, etc to gain any advantage. But the limiting factor in a diesel is usually the time available for the flame front travel to burn efficiently the fuel and air charge availble. Just dumping in more air and more fuel is a definate loss of power and destructive to engine components (overheating, burning valves, increase in emissions.)

If you search the posts for the overheating troubles with all Patrols ATM, 4.2 and 3.0 you will see that there isnt much room for improvement without opening pandoras box to a never ending search for reliability!

But look at the bright side, there are a never ending line of rice burners out htere just begging for someone to screw the boost up, fit a 8 inch exhaust, plenty of mesh in the grill, remove the suspension so it rides like a go-kart and wrap a bit of licorice around the 20inch imported rims to satisfy your hunger to change what millions of reseach and development dollars went into to create!!

;) Matt.
AnswerID: 115228

Follow Up By: Wizard1 - Friday, Jun 10, 2005 at 12:53

Friday, Jun 10, 2005 at 12:53
Totally agree, if you want to play around with a turbo keep your WRX....

Diesels aren't meant to be race cars....But I'll probably see a sick Patrol lowered with fat rubber and huge sub-woofer, mate....It may as well be on the Gold Coast along with the rest of those To@@ers......

FollowupID: 370965

Reply By: blackwrx - Friday, Jun 10, 2005 at 14:26

Friday, Jun 10, 2005 at 14:26

Thats the info I was after, 17psi is a fair bit of boost to be running.

AnswerID: 115247

Follow Up By: muzzgit (WA) - Saturday, Jun 11, 2005 at 02:01

Saturday, Jun 11, 2005 at 02:01
I dunno where I heard it, but someone mentioned even higher boost than that (over 20) in the 3.0 patrol. While I doubt this is true, 17 is pretty high and being a 4 cyl jobbie, I'm assuming you simply want to get one to go BANG !!

From what I've heard, the DTronic is good value and a well researched product. Bringing boost on ealier is something I would like but I can't afford one and I'm not convinced that Nissan will make good on the warranty if it goes bang.
FollowupID: 371046

Reply By: Member - Robert W (VIC) - Saturday, Jun 11, 2005 at 09:23

Saturday, Jun 11, 2005 at 09:23
My GU 2.8TDI has a Motson chip and a boost compensator.
The chip changes fueling and allows eairlier boost to standard, the boost compensator gives a higher max boost -- I have set mine at 15psi by adjusting the bleed valve which just delays operation of wastegate.
Some time ago a perished hose prevented operation of wastegate so boost was not controlled and went to 20psi (discovered this after fitting boost gauge) The wastegate was also seized but freed up eaisly -- to check wastegate is operational move lever with spanner (if you do not have a gauge)
Do not think above mods will shorten engine life as max boost is rarely used unless you try and drive it like a sports car.
AnswerID: 115336

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