egt,boost ,oil pressure guages

Just wondering where you guys have taken your guage readings form. I have heard that egt should be taken re and post turbo? Which area is better and which is easier. Also where do I take boost from and should I get a mechanical oil pressure guage rather than an elec guage(24 volt system and all). Thanks for all the help guys as this is all new to me. If you have photos that is best as I am a see and do person way more.

[crushers]

they say pre turbo is best for readings but from my view if that sensor ever broke off there goes your $1000+ turbo...
i run all mine post turbo and as close to the turbo as possible.
mech oil is good
boost is in the pipe from the turbo to the throttle body.

[ boost is in the pipe from the turbo to the throttle body.[/quote]

So anywhere between the the turbo and throttle body is good? I am assuming that boost is the amount of pressure the turbo is forcing into the motor? I thoght that the boost was something to do with the operation of the wastegate.I now see that the wastegate controls the amount of boost.

[fjbj40]

I don't know if diesels are different but in gas engines you can only get a true boost pressure reading when taken from the intake manifold after the throttle body , correctly known as manifold absolute pressure or map . I have personally seen this on the 6 turbo powered gas vehicles I have owned . No turbo diesel experience yet but soon to change .
HTH , Daryl

[jzilla]

Have my Egt probe post turbo,
But am putting a fitting preturbo so I know exactly what is happening.
I can always put it back to post after I find out.
I want to find out what I can get away with, with it post I am too careful cause I don't know the real reading, it can vary too much.
Just an idea is put fitting in both places then you can compare difference.
john

sounds like a good idea jzilla.

[cruiser_guy]

My EGT is pre-turbo and I'm not worried about it breaking off. The boost gauge is off a "T" from the waste gate control signal.
If you put the EGT in pre turbo you'll want to pull the manifold to drill and tap it, just to make sure it's clean. A bit of steel shavings in the turbo bearings can ruin your whole day!

[The Dude]

I have my EGT pre-turbo...on both the duramax and the 12H-t. I drilled them both on the truck, with the engine running. Scary as hell but worked both times. I got lucky on the HJ61 as I drilled dead center of the manifold only to find that it has a support inside that I was unaware of. This resulted in the probe being on a slight angle.

I also pulled manifold pressure off of a T to the wastegate.

A mech oil gauge is a good idea.

I have all Isspro mech gauges and I am very happy with them. A simple resitor in line and the EGT works on 24V. A change of lights is all that is needed for the mech oil and boost gauges.

I mounted my guages in the overhead pod on the 61. I removed the altimeter and outdoor temp gauge. It was a PITA routing the lines down the A pillar but well worth the clean look IMO.

I snap a picture tomorrow in the light if you like.

[crushers]

Originally Posted by cruiser_guy

My EGT is pre-turbo and I'm not worried about it breaking off. The boost gauge is off a "T" from the waste gate control signal.
If you put the EGT in pre turbo you'll want to pull the manifold to drill and tap it, just to make sure it's clean. A bit of steel shavings in the turbo bearings can ruin your whole day!

i have had 2 egt probes break on me know so i will not take the risk...
cheers

[tlcruiserman]

I run my EGT post turbo as close the the Turbo as possible, I run the boost gauge off of my cast runner from turbo to Thottle body (3B's with AXT). If you are running a 3B engine in anything and put a turbo on it I strongly suggest when you buy the boost and EGT gauges you also invest in a Water Temp Gauge, I think that is even more needed with the 3B then aftermarket oil pressure gauge. I run all mechanical gauges, if you are running on 24v system be careful which gauges you run because some still require 12volt power (higher end autogauge brand). The standard gauges I do with Turbo of 3B is EGT, Boost and Water Temp. Also if you are putting them in 24volt Cruisers you can hook the lights in series if you have two or more and still wire them into the dash lights.

G-day,

Michael

[jzilla]

Wayne, what brand where they?

[crushers]

auto meter...

[crushers]

Originally Posted by tlcruiserman

Also if you are putting them in 24volt Cruisers you can hook the lights in series if you have two or more and still wire them into the dash lights.

G-day,

Michael

or replace the bulbs with 24V...

Dude would love some photos if you can. You said you took the manifold(boost?)pressure off of a tee to the waste gate. Are you speaking of the rubber tube that goes to the wastegate actuator? also you used a resistor to reduce the voltage from 24 volt to 12 volt,As I pick up my gauges tommorrow I am assuming the egt sensor needs 12 volts to operate, where did you get the resistor from or will any electrical suppiler have these as well as the 24 volt lights for the other gauges?

I also wonder what the difference in temps would be going from pre to post turbo.

[cruiser_guy]

Originally Posted by crushers

auto meter...

I've got the Isspro gauges. They appear to be more high end so I trust they are more durable. Time will tell.

[crushers]

personally, if you are running your engine that close to the melt down that you need the pyro before the turbo then change your driving habits... or have a spare engine sitting in the garage waiting to be installed...
this is not a dig at anyone, just common sense...
cheers

[fjbj40]

does the 13bt and 12ht have a throttle plate in the throttle body like the 3b?
If my memmory serves me correct I once looked at a 3bII and it did not have a throttle plate but a mechanical linkage running to the injection pump from the throttle body .
Daryl

[jzilla]

So what happened with those probes Wayne?
What did autometer say?
Any warranty or anything?

[dieselcruiserhead]

Interesting. I use the autometer z gauges. The EGT probe is definetely beefy and high quality. I have run both pre and post turbo. pre is nice because it tells you actual EGTs. Post is nice because it tells you more or less actual turbo temp. So they both have advantages and drawbacks. Ideally you would probably want both I'd suppose but once you got an idea of the difference between the two I'm sure you wouldn't need them both anymore. I have mine literally an inch or two from the turbo exhaust and it is a good location. And if it were to fall off then I would be OK as well...

Andre

[NStimac]

The way I see it is that you would want your probe as close to what ever your trying to measure. Measure EGT on the collector and boost from the intake manifold. However this does not mean you would want to install a probe in a runner of a manifold unless you’re measuring just one cylinder. I haven’t heard of probes breaking from a quality source until Wayne.

My .02
-NS

[The Dude]

Yup, that's what I did. I took the resistance of the EGT "box" and bought the same resistance resistor from my local electronics shop. I found the bulbs at the Volvo dealer for cheap.

Sorry, just been busy...I will try for those pics tomorrow.

And as far as changing driving habits??? Why? That's why I have my probe pre-turbo to make sure I don't have a melt down...

Originally Posted by burger

Dude would love some photos if you can. You said you took the manifold(boost?)pressure off of a tee to the waste gate. Are you speaking of the rubber tube that goes to the wastegate actuator? also you used a resistor to reduce the voltage from 24 volt to 12 volt,As I pick up my gauges tommorrow I am assuming the egt sensor needs 12 volts to operate, where did you get the resistor from or will any electrical suppiler have these as well as the 24 volt lights for the other gauges?

I also wonder what the difference in temps would be going from pre to post turbo.

[crushers]

Originally Posted by jzilla

So what happened with those probes Wayne?
What did autometer say?
Any warranty or anything?

they broke off, well they were much shorter when i pulled them out.
auto meter warrentied them with no hassel at all. i was as surprised as the next guy, these are beefy probes...
cheers

Sorry for sounding so stupid but the egt "box" you are speaking of is just the packaging that it comes in correct? Iask this as I still have not gone down to pick up my gauges(too busy also) and am flying a little blind here

[jzilla]

Wayne any damage to your turbos?
Or is that the reason you checked?

[crushers]

no damage to the turbo since it was post turbo installation. i was installing a new exhaust on the first one and i can't remember why on the second one...
cheers

[cruiser_guy]

Originally Posted by burger

Sorry for sounding so stupid but the egt "box" you are speaking of is just the packaging that it comes in correct? Iask this as I still have not gone down to pick up my gauges(too busy also) and am flying a little blind here

That would be the electronics. The EGT probe varies resistance based on temperature and the electronics read that resistance and send a signal to the gage.

Cheers, thanks for the info cruiser_guy.