Boost Gauge ? correct fitting - Help

Submitted: Monday, May 19, 2014 at 21:16
ThreadID: 107851 Views:4751 Replies:6 FollowUps:13
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Hi,

I had a boost gauge installed by a diesel mechanic but, I think its in the wrong place.

Can anyone help?

http://i.imgur.com/uOInWXF.png[/IMG]

I know that it should go on the intercooler pipe, but will this work ?

It works, but not how it should the gauge I have is a dual vacuum (left) gauge & boost (right side) The needle stays in the vacuum and never makes it into the positive (boost) it looks like it pulls a vacuum between gears and only make it to the middle of the gauge (zero) when foot is on the accelerator.

so it is always in the negative and when applying accelerator goes only to zero

Help do I need to get this refit or is it the gauge that needs to be reset
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Reply By: i4WD - Monday, May 19, 2014 at 21:24

Monday, May 19, 2014 at 21:24
its a ZD30 Nissan Patrol engine 2001 GU11

and the gauge is hose to an electronic sensor
AnswerID: 532791

Follow Up By: i4WD - Monday, May 19, 2014 at 21:35

Monday, May 19, 2014 at 21:35
Image shows where should be fitted a I have draw in where they fitted mine

where does this line go to ?

http://i.imgur.com/3IIoXpq.png[/IMG]
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FollowupID: 816090

Follow Up By: Member - Rosss - Tuesday, May 20, 2014 at 10:56

Tuesday, May 20, 2014 at 10:56
That pipe that it is hooked up to is a line to the unit that adjusts the variable vanes on the turbo, it will never read the boost, if this bloke is a so called diesel mechanic I would not even take it back to him to get it redone, find someone that knows what they are doing, it will cost less in the long run.
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FollowupID: 816111

Reply By: Ross M - Monday, May 19, 2014 at 21:48

Monday, May 19, 2014 at 21:48
That picture looks like an actuating chamber to me and not a sensor at all.

Maybe the pressure to that is switched by an electric solenoid.
Just join up the line to make it original operation without the tee and find a spot just before the air enters the manifold.

There may be ports there which are far more suitable and actually reads the boost.

Having a dual gauge is fairly pointless as there will be hardly any vacuum created to ever read.

You did say, "fitted by a diesel mechanic" didn't you! Hmmmm.,
AnswerID: 532792

Follow Up By: i4WD - Monday, May 19, 2014 at 22:13

Monday, May 19, 2014 at 22:13
Hi Ross,

I am thinking it's the fitting not the gauge and I need to know if it was was fitted wrong before I go marching in there demanding it redone. As It could be the gauge that needs to be reconfigured.





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FollowupID: 816095

Follow Up By: Ross M - Tuesday, May 20, 2014 at 08:28

Tuesday, May 20, 2014 at 08:28
Can you squirt some compressed air into just the gauge? That should see if it goes above zero OK. Not too much pressure as the gauge will be lower rating than the compressor. Just to check movement of the needle.

For a mechanic to fit such a gauge and then not check if it works is somewhat negligent.

You can't reconfigure the gauge as such, but it's pressure feed line does, clearly, have to come from where turbo pressure will be/is.

Any mechanic should be able to achieve that.
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FollowupID: 816102

Follow Up By: i4WD - Tuesday, May 20, 2014 at 10:55

Tuesday, May 20, 2014 at 10:55
Hi Ross,

Will try that today see how I go thanks for the idea.


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FollowupID: 816110

Reply By: Member - Andrew L (QLD) - Monday, May 19, 2014 at 22:24

Monday, May 19, 2014 at 22:24
If you have a diesel, why did you buy a vacuum and boost guage..?
AnswerID: 532797

Follow Up By: i4WD - Monday, May 19, 2014 at 22:28

Monday, May 19, 2014 at 22:28
I bought a Boost gauge and the picture showed only the Boost function however, when it arrived it was both in the one gauge.
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FollowupID: 816096

Follow Up By: Malcolm 02 - Tuesday, May 20, 2014 at 09:21

Tuesday, May 20, 2014 at 09:21
At low REVs the turbo isn't spinning fast enough to affect positive pressure and if you put your accelerator down against a load (ie clutch engaged) you will see a vacuum until the turbo is spinning fast enough to build up pressure. This was especially noticeable on the older turbo engines and why they were so easy to stall on take off with a manual gearbox.

Mal (retired plant mechanic)
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FollowupID: 816105

Follow Up By: i4WD - Tuesday, May 20, 2014 at 10:51

Tuesday, May 20, 2014 at 10:51
Thank you Malcom,

I have taken her for a spin but never get above the zero (middle of gauge) just goes back and forth in the vacuum.
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FollowupID: 816109

Follow Up By: Malcolm 02 - Tuesday, May 20, 2014 at 12:15

Tuesday, May 20, 2014 at 12:15
Sorry, just looked at your picture and the mechanic has teed it into the wastegate valve (prevents over pressurising the intake to the engine). On some engines this will work but depends on the control system used to operate the wastegate, in your case I would say it hasn't and it should have been attached to the intercooler.

Mal
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FollowupID: 816117

Follow Up By: Ross M - Tuesday, May 20, 2014 at 17:40

Tuesday, May 20, 2014 at 17:40
Malcolm 02
I doesn't have a waste gate at all.
It has a variable vane turbo, so NO waste gate.
As Rosss said, it is the variable actuation chamber and it receives varied pressure to effect the vane position in the turbo.
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FollowupID: 816128

Follow Up By: Polaris - Wednesday, May 21, 2014 at 11:44

Wednesday, May 21, 2014 at 11:44
X2 - there is no wastegate on a 2011 Nissan ZD30.
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FollowupID: 816174

Reply By: Dave(NSW) - Tuesday, May 20, 2014 at 10:22

Tuesday, May 20, 2014 at 10:22
I4WD,
If you go to the Patrol forum you will find the answer to your problem.
http://www.patrol4x4.com/forum/

Cheers Dave
GU RULES!!

Lifetime Member
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AnswerID: 532804

Reply By: Oldbrowny - Tuesday, May 20, 2014 at 14:11

Tuesday, May 20, 2014 at 14:11
That will never work, I think that the swirl control. It should be plumbed into the intercooler or the outlet pipe from the intercooler.

I tapped mine into the rear of the cooler, I didn't think there was enough metal on the pipe to hold the fitting in well enough. However most I have seen have been plumbed into the pipe.
AnswerID: 532816

Reply By: Hoyks - Tuesday, May 20, 2014 at 17:13

Tuesday, May 20, 2014 at 17:13
If it was plumbed into the tube on the turbo that runs to the waste gate actuator, then it would work.

That doesn't look to me like it is a line that sees any pressure at all as it has no hose clamps fitted.
AnswerID: 532828

Follow Up By: Ross M - Tuesday, May 20, 2014 at 20:03

Tuesday, May 20, 2014 at 20:03
Hoyks
The variable vane chamber and it's feed pipe on a Dmax has NO clips or clamps to hold the line in place either. ALL Dmax are the same.

They just slide the line/hose on and leave it. You find out when the hose blows off and you get no boost.
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FollowupID: 816138

Follow Up By: Polaris - Wednesday, May 21, 2014 at 11:57

Wednesday, May 21, 2014 at 11:57
There is NO wastegate on the Nissan D30. The variable vanes in the turbo are actuated by vacuum (not boost) from the vac pump . Nissan control the amount of vacuum electronically - but better control is achieved by using a Dawes valve to mechanically limit the amount of vacuum at the actuator.
Best spot for accurate boost measurement is at the front tank of the intercooler - near where Nissan have placed the boost sensor.
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FollowupID: 816176

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