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Engine Specific Info and Questions => IDI Engine => Topic started by: twoeightbunny on August 12, 2008, 07:48:58 pm

Title: egt gauge question?
Post by: twoeightbunny on August 12, 2008, 07:48:58 pm

i know that the best place is in the exhaust manifold before turbo inlet.
 how far out will the readings be if i install it into the outlet of the turbo on the downpipe due to the usual corosion and rust problems on exhaust bolts ectand not wanting the car to be down as it is a daily driver? all info greatly appreciated. thanx

Title: egt gauge question?
Post by: Vincent Waldon on August 12, 2008, 09:18:46 pm

It will be out by a variable amount, since the turbo will convert variable amounts of heat into energy.  It would be great if you could just add 500 degrees to the reading but sadly that's not the case.

Meaning:  as a diagnostic tool it will be pretty much useless... you'll be melting your pistons and have no idea.

Mounting it correctly is a huge pain, no doubt.  Perhaps you can find a spare exhaust manifold to prep up and reduce the downtime ??

Title: egt gauge question?
Post by: jimfoo on August 13, 2008, 06:47:36 am

If you are more worried about taking out the manifold bolts, maybe you can just take the turbo off and use a smaller hose attached to a vacuum to suck up the drill and tap tailings.

Title: egt gauge question?
Post by: mk2diesel on August 13, 2008, 06:36:16 pm

or put a high pressure vac  cleaner (outlet) to the exhaust pipe  to pressurize the exhaust system , then drill  a small hole first, and then open it up , chips should be blown out of the hole you drill...   same for tapping debris.

Title: egt gauge question?
Post by: burn_your_money on August 13, 2008, 06:50:56 pm

Covering the drill bit and tap in grease will also help catch some, but not all of the shavings

Title: egt gauge question?
Post by: Smokey Eddy on August 13, 2008, 08:50:40 pm

I hear ya!
I snapped bolts of mine off in the manifold AND downpipe  :cry:  which i still need to drill/tap out
stupid high temp EG!!! ruining lovely machined bolts and restrictive downpipe
i would take it off. It's actually resonably easy to take the head off, then take the manifolds off with the turbo still on it and go from there. I took my head off and back on in less than (well under actually) 2 hours of real work (im subtracting time taken to go buy glowplugs and a metal 1.9 gasket coz it was only 10$ more :P)
I'd take the head off and go from there then if you could just screw the sensor into your tapped hole when it's on there and you're good to go...
just an idea...

Title: egt gauge question?
Post by: Vincent Waldon on August 14, 2008, 09:45:43 pm

Turn it into an excuse for a timing belt and fluid change (oil/coolant) and the head part hardly adds any time at all.

You can also test/swap out glowplugs, replace that leaky valve gasket, decarbonize, fix that exhaust manifold rattle... tons of reasons to pull the head while you're installing your EGT sensor.   :wink:

Title: egt gauge question?
Post by: Jet A on August 19, 2008, 07:30:16 pm

egt pre turbo tells you when you about to fubar something
egt post turbo tells you when you DID!!!

Drill it out and start it up. get most of the  shavings out, and dont worry about the rest. they wont hurt anything as the pass by the exhuast turbine blades. they wont be spinning nearly fast enough to hurt anything....just dont rev it when you start.  IF that makes you nervous, greeseing the drill bit and drilling the last little bit with the engine on will blow out the rest.

Title: egt gauge question?
Post by: dieselsmoke on August 20, 2008, 05:51:24 am

Where can one buy a good egt sensor? Does anyone on the forums here sell them? Also, does anyone have a pic with one of them installed on the manifold? Thanks

Title: egt gauge question?
Post by: myke_w on August 20, 2008, 06:00:39 am

I like ISSPRO They're relatively inexpensive and work well.

you can buy them from http://egauges.com/vdo_mult3.asp?Type=Pyrometer&Series=EVA_R&Units=E

I'm working on a wholesale account with them so that maybe I can offer EGT gauges at a better price.

Also, here's a pic of an egt gauge installed in a manifold.

(http://lh3.ggpht.com/myke.welch/Rz4ymm7Gq5I/AAAAAAAAKJk/npnmxn13rOo/s800/IMG_5129.jpg)

Title: egt gauge question?
Post by: arb on August 20, 2008, 06:03:48 am

http://www.aircraftspruce.com/catalog/inpages/wultradEGT.php

They have many different models at Aircraft Spruce.  Many guys building are cheapskates so they need low cost items.

Title: egt gauge question?
Post by: dieselsmoke on August 20, 2008, 07:47:43 am

is there some kind of sealent that needs to be put on the threads so it dosen't leak??

Title: egt gauge question?
Post by: myke_w on August 20, 2008, 07:48:51 am

I used teflon tape, but all egt fittings are tapered and shouldn't really require it.

Title: egt gauge question?
Post by: jimfoo on August 20, 2008, 08:41:45 am

Teflon also will only last until the first time you drive. :lol:

Title: egt gauge question?
Post by: myke_w on August 20, 2008, 08:46:10 am

Quote from: "jimfoo"

Teflon also will only last until the first time you drive. :lol:

Is that what was burning off under the hood?  :lol:

Title: egt gauge question?
Post by: morefuel on August 24, 2008, 06:58:16 pm

okay so i found my gauge but i have a few qeustions  am i buying just the gauge or is that the sensor 2 ?and will the gauge come with tap instructions and is the  temp  dangerous to exceed 950f   or  1250f  ? i havent done any mods except exhaust and i want to instal this and boost gauge befor i do so basically i was wondering if this gauge is suited to my 1992 1.6 td
thx

Allen

Title: egt gauge question?
Post by: arb on August 25, 2008, 09:48:52 am

use a drill press so you don't risk breaking it like I did mine:

http://vwdiesel.net/phpBB/viewtopic.php?t=15633

Title: egt gauge question?
Post by: saurkraut on August 25, 2008, 01:37:56 pm

A drill press is nice, but an (not cordless) electric drill with cobalt bits goes through that manifold like a hot knife through butter.  Pleanty of oil helps allot.

I've done 2 so far with out a problem.

And I switched both of mine from the VDO probes to the Spruce probes because they're faster than stink.  Its just an added bonus that they're not expensive.

Title: perfect
Post by: twoeightbunny on August 25, 2008, 05:22:23 pm

just wanna say thanx for the good info. now next question. just wondering on turning up the pump. ive read through various postings on doing so. however the post that sticks out is when turning up the starwheel can u do this while the vehicle is running? if so great. all the help is awsome keep it coming. thanx chris.