Boost Guage

Submitted: Saturday, Feb 25, 2012 at 00:43
ThreadID: 92083 Views:1890 Replies:4 FollowUps:6
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On turbo diesel vehicles what benefit can I expect to get from a boost guage.? I mean for example it might be interesting to know the temp of my gearbox and it may get hotter when towing but we tend to leave the gearbox to its job and concentrate on driving. I was thinking about a EGT guage but I am in the dark on the benefit of having a boost guage assuming the turbo has been already set up by a technician, I know it measures turbo boost pressure but why should I be watching that ?
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Reply By: Dave(NSW) - Saturday, Feb 25, 2012 at 01:12

Saturday, Feb 25, 2012 at 01:12
It all depends on what you are driving.
If it's a 3lt Patrol then they sometimes have a habit of over boosting if the Maf sensor gets dirty and can cause extensive damage to the engine.
Cheers Dave
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Follow Up By: Member - Vern - Saturday, Feb 25, 2012 at 08:21

Saturday, Feb 25, 2012 at 08:21
Dave

What boost range should the 3lt be pulling and at what point do you say it is over boost.

Vern
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Follow Up By: Dave(NSW) - Saturday, Feb 25, 2012 at 09:59

Saturday, Feb 25, 2012 at 09:59
Vern,
Mines a 4.2 so a bit differant.
If you check on here http://www.patrol4x4.com/forum/ you will find all the info you need about the 3lt Patrols including how to reduce the risk of having problems.
Cheers Dave.
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Follow Up By: kwk56pt - Saturday, Feb 25, 2012 at 11:40

Saturday, Feb 25, 2012 at 11:40
I have 1 4.2 patrol GU with intercooler, can you tell ,me where you get the boost reading from the motor ? I think I will get the EGT and perhaps the boost in a combo guage. I appreciate the replies
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Follow Up By: Dave(NSW) - Saturday, Feb 25, 2012 at 14:07

Saturday, Feb 25, 2012 at 14:07
This might help http://www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/dawes-valve-plumbing-78555/
There is a bit of reading to sort it out.
Cheers Dave
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Reply By: Falco80 - Saturday, Feb 25, 2012 at 02:03

Saturday, Feb 25, 2012 at 02:03
If your vehicle is stock i would not worry about EGT or boost gauges, unless you are doing some heavy towing. If you have played with the fuelling or adjusted boost, or plan to do these things later on, then yes you should fit both of these gauges. Some people also just like to know what is happening under the bonnet.
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Reply By: Member - Michael and Chris (QL - Saturday, Feb 25, 2012 at 08:08

Saturday, Feb 25, 2012 at 08:08
A boost guage can also let you know if you have a hole in the intercooler or a loose hose clamp. (drop in boost) It is better set up with a pyro as the first sign of a boost leak would be higher EGT. For peace of mind I would get both.
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Follow Up By: kwk56pt - Saturday, Feb 25, 2012 at 11:45

Saturday, Feb 25, 2012 at 11:45
Thanks at least a boost guage will detect a intercooler fault, the loose hose clamp would be good. My understanding is that the oil in the air from the breather returning via the intake to the intercooler will attract dust at the intercooler to signal a leak in the intercooler. I think I will look at a combo EGT/ Boost guage,
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Reply By: Member - Captain (WA) - Saturday, Feb 25, 2012 at 10:10

Saturday, Feb 25, 2012 at 10:10
If you have a stock vehicle and otherwise are not too interested in the readings, then extra guages are of little benefit. But if you have a GU 3.0TD or have done any mods to your vehicle, then aftermarket gauges can help. IMHO the EGT guage would be the most useful, the turbo boost is not that critical (usually!).

If you have a post-2006 vehicle, then they have a common OBDC port and you can tap into this with a range of aftermarket devices.

On my 200 cruiser, I have the scanguageII and can see a huge amount of things ie. boost pressure, intercooler temp, water temp (accurate, unlike vehicle guage), auto trans temp, etc... and thats just for starters. For under ~$170, its the cheapest way to get a whole bunch of guages. The only guage I have added is the EGT, the 200 doesn't have one of those as part of the vehicle instruments.

One of the benefits of the auto transmission temp reading was seeing how hot the auto got under load. As the 200 has bulk power, often I would leave it in high range and use the power on tough 4WD sections. But after seeing how hot the auto got (~126C), I will now go to low range earlier and see a ~20C drop in auto temp for the same bit of track. Without a guage, the vehicle seemed to be handling it easy and I was none the wiser. But now I can look after the auto box a bit better.

Same concept goes for EGT temp, you can see when you are working the engine hard and have data to know if to back off, or go down a gear (higher revs for same load = lower EGT).

Cheers

Captain
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Follow Up By: Member - Scooby (WA) - Saturday, Feb 25, 2012 at 10:21

Saturday, Feb 25, 2012 at 10:21
Well said Captain, I agree 100%. My vehicle will not support a Scanguage unfortunately but I find the boost gauge and more so the EGT gauge invaluable and I often have to back off on long hills when towing. And yes my turbo install was set up by professionals.
Regards
Scooby
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