Turbo temp gauges, how to set up??????

Submitted: Sunday, Jun 11, 2006 at 14:33
ThreadID: 34823 Views:4145 Replies:2 FollowUps:3
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Hi all
Just wondering if anyone would be able to help out on
1 how do you set up a temp gauge for a turbo? i have been told to set up the sensor 300mm from the turbo???
2 is there any particular brand to go for?
3 what temp is safe or correct and what is not good???
4 is there anything else i should be aware of?
thanks
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Reply By: Chaz - Sunday, Jun 11, 2006 at 15:21

Sunday, Jun 11, 2006 at 15:21
Hi G N,
I would get the pyro as close to the turbo as possible. Mine is only about 20mm from the turbine wheel.
Don't let it get above 530Deg.C after the turbo or 750DegC before the turbo.
This is how I did mine.

Chaz
AnswerID: 177956

Follow Up By: Member - G N (VIC) - Sunday, Jun 11, 2006 at 17:13

Sunday, Jun 11, 2006 at 17:13
Hi Chaz
thanks for info
gauges look great
so do you have a sensore pre and after the turbo?
if so do you use one gauge to read both?
how did you come up with the safe temps? and have there been any occasions when you would of exceeded these temps?
if you only had the sensor after the turbo would you expect that you would always be within the pre turbo temp limit?
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FollowupID: 434119

Follow Up By: Plantman - Sunday, Jun 11, 2006 at 18:17

Sunday, Jun 11, 2006 at 18:17
Is that otheer pic of the nissan launching over the sand dune doctored? Surely it is.
Also is the gauge rack a custom made plastic moulding or something you bought off the shelf. Do they have them for Hilux?
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FollowupID: 434124

Follow Up By: Chaz - Monday, Jun 12, 2006 at 12:09

Monday, Jun 12, 2006 at 12:09
Hi G N,
I’m only using a sensor after the turbo, but I will fit one before it when I have a need to remove the exhaust manifold. I’ve heard of others that have both and switch from one to the other using the one gauge.
Those temps are the maximum that I was told to go by from the salesman at VDO where I bought the gauges, but I think Ian’s advice would be closer to the mark. Mine usually runs around the 300DegC mark, unless I’m towing and then it has crept up to 450. If it gets to 500, I’ll pull over and idle it down for a while.
I would have thought that mounting it closer to the turbo would be a better option because I have a catalytic converter about 200mm past the turbo, and I wouldn’t want it after that.

Hi Plantman,
That picture was made up, if you read the mouse over text you’ll get the idea.
Those gauge pods are available over the counter, but I haven’t seen one for a Hilux yet.

Chaz
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FollowupID: 434247

Reply By: Ian from Thermoguard Instruments - Sunday, Jun 11, 2006 at 16:03

Sunday, Jun 11, 2006 at 16:03
Hi GN,

At the risk of looking like a blatant bit of self-promotion, can I suggest you have a look at my website and download the "EGT Information Sheet" from the link on the home page. I think it will answer most of your questions. And regardless of whether you like the look of my gauges or not, please feel free to ask any other questions that may arise.

Regarding sensor location, there's not going to be much difference between the measured temperature 20mm from the turbine outlet and 400mm from the outlet as there's not much expansion going on in that part of the system. The big temperature difference is between the turbo inlet and outlet, where the gas is being expanded across the turbine and where the difference between upstream and downstream temp can reach or exceed 200C. Hence my recommendation for a maximum upstream temp of 720C and a maximum downstream temp of 520C.

A couple of articles which Michelle and David have published here might also be of interest if you're new to diesels and turbos: Why Diesels are Different and Turbos and Superchargers. Hope this helps.
AnswerID: 177958

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