Oil sensor locations, fittings etc

[Marf]

The tap supplied with my Greddy EGT wasn't, I guess in that respect it was more of a bung than a tap.

[Shmed]

Sorry, I thought you meant the tap I use to thread the hole I drill into the manifold.

The sensor fitting is threaded (not like the weld on bung I got with my wideband)

[Marf]

[djpkins]

You really need to know that sensor isn't gonna degrade and start whizzing off into the blower...surely...even though it's not quite as acurate, it's a whole lot safer...what about right on the side of the downpipe elbow?

[Shmed]

Yep, tis a good point, one that Ash (Ashman) made about his - as the flash git is having 4 EGT's on his Full Race

I think he is using the four during mapping etc, then taking them out for normal running.

I think I'm going to throw caution to the wind and get it fitted in the manifold collector. I'll just have to add 'Check the condition of the EGT probe' to my 'Regular Maintenance Task List'

[Marf]

You really need to know that sensor isn't gonna degrade and start whizzing off into the blower...surely...even though it's not quite as acurate, it's a whole lot safer...what about right on the side of the downpipe elbow?

It's an EGT sensor, its designed to take temps well in excess of what it can read.

Seriously, EGT fitted post turbo is just gauge whore window dressing. If you want real information, go pre-turbo.

[djpkins]

Stick up a pic of the ideal location...I'm going to drill my manifold out while it's all off the car...how much "probe" is there on your Greddy sensor?

[Shmed]

The stock manifold is twin scroll isn't it? Makes it a bit harder (as you'll only get the temp from 2 pots).

I think I'm going to have the probe into the T3 adapter plate instead, as that will have exhaust gas from ALL cylinders (although I could've misinterpreted that).

[Shmed]

And my gauge is a Saga Racing V5 (bought that because it's the same as my boost gauge).

[Marf]

On my Charade Turbo I had it in the middle runner(3 cylinder engine)



See where the end of the probe gets thinner? most all of that was in the manifold exposed to the exhaust gas.

[Shmed]

That looks very similar to the one I have.

[Shmed]

The probe I have has a piece that is threaded on both ends, one of which I am sure screws into a drilled and tapped hole in the exhaust. It also has an olive type thing, and a collar.

I've dummy fitted it together, and the probe just drops out of the collar, is there something I'm missing? Will it tighten up if I apply proper torque?

The instructions aren't any use!

[djpkins]

gotta web link...

[Shmed]

Nah, never have found one. I got the gauge from Autodials.co.uk

I'm sure Tim will work it out. Just going to drop the sensor off with him

[ashley]

The probe I have has a piece that is threaded on both ends, one of which I am sure screws into a drilled and tapped hole in the exhaust. It also has an olive type thing, and a collar.

I've dummy fitted it together, and the probe just drops out of the collar, is there something I'm missing? Will it tighten up if I apply proper torque?

The instructions aren't any use!

The thermocouples I have used are basically a straight metal probe with a plug on one end.
You put a round olive on this which is loose on the probe. Then postion the whole thing in the boss with the thermocouple in the position you want.
Then screw the collar onto the top of the boss and tighten which deforms the olive and clamps the probe in place.


Re: using a probe after your turbine- there is value in doing this if you know what you expect your maximum temperatures to be there.
My logic is I will map and record EGT's as close to the exhaust ports as possible (and use the EGT's to trim fuel levels to individual cylinders if required).
We'll then measure the EGT after the turbo at the same time- giving me a 'safe' EGT at that point in the system.
I can then run without the sensors in place before the turbo, just using the sensor after the turbo as a warning device....if temp's get above the level we measured at mapping there is an issue.

[Shmed]

Makes sense, it's all about having a known reference or baseline.