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mike saunders 08-30-2004 09:49 AM

Best location for a EGT sensor
I know there was a discussion here and elsewhere about whether to put the EGT probe before or after the turbo...

I'm leaning toward the manifold instead of the downpipe, but where?

Who has put one in, and what's been your experience?

bollman 08-30-2004 10:25 AM

As I understand, the place to have them is right where the exhaust from all 4 cylinders meet. But also from what Ive heard, it hard to make a hole to put the probe in, without making damage. Also, you dont want any parts to enter the turbo so youd better remove the turbo before drilling.

ricot83 08-30-2004 11:58 AM

u want it in the manifold where all four runners meet... if this is not possible u want it as close as possible... to that point..... it definately is b4 the turbo not after..

mike saunders 08-30-2004 12:10 PM

Does a fitting have to be welded, or is there a heat-resistant epoxy that can secure it?

ricot83 08-30-2004 01:39 PM

when u tap it, it should be tapped with a thread and then some kind of sealant should b used.

iwantaviggen 08-30-2004 02:08 PM

you can either tap it or weld a bolt on top of the hole... but do make shure you clean the manifold out very well after your done..

mike saunders 08-30-2004 02:57 PM

I'm planning to take the manifold off before I do it, so I'll be able to clean out any shavings before they get into the turbo....(mmmm...ground up metal in an exhaust housing...Now that's a nice sound!)

Drill, tap, fit, seal....

Should be relatively easy....

Thanks for the input, fellas....

CO-Saab 08-30-2004 04:18 PM

Mike all info previously supplied is correct. If you want checkout my site and enlarge the photo's of my ex. manifold. You should be able to see how I did it. Enjoy, and let me know what reading you see.

ERP 08-30-2004 04:57 PM

There is one more important point to consider, and thats the max temp the probe can handle. Before the turbo is definitely the spot. But my thermocouple and gauge can only read up to 1600F, and Ive seen it above 1500F. This restricts it to after the turbo. I would recommend a gauge and thermocouple that can register 2000F if you want to tap before the turbo.

BurnsSide42 08-30-2004 05:37 PM

awesome - this is good info. I am waiting on my auto-meters so now I know one step that I'll hafta take to prep the manifold before hand so I don't hafta remove it once it's ON the car. We need a picture/text of the procedure exactly - anyone care to write this up? If no-one does it before I Install mine - I'll do it,

iwantaviggen 08-30-2004 05:39 PM


Originally Posted by BurnsSide42
I am waiting on my auto-meters

auto-meter?..... why not some Defi gauges?....

gotta go baller

BurnsSide42 08-30-2004 05:46 PM


Originally Posted by iwantaviggen

Originally Posted by BurnsSide42
I am waiting on my auto-meters

auto-meter?..... why not some Defi gauges?....

gotta go baller

Why - cause I am getting them to Donate my a full series of gauges for free in trade for their sponsorship - and I'll help promote their items at shows, as wel as bring them onboard with TSL so that there may be a future discount available perhaps - that's why - So Go with Auto-Meter :P They Rock!

ricot83 08-30-2004 08:59 PM

something to think about here

iwantaviggen 08-31-2004 02:20 AM

ricot83 : good find!!!!

and Burns i know autometer is good....(i own a boost gauge) and thats awsome..please let us know of the discounts if they become available....

i just really like the defi gauges...they look good!!

DC_SAAB 08-31-2004 07:05 AM

or.... I wonder if 1200 the ticket...

CO-Saab 08-31-2004 07:26 AM

To the best of my knowledge, an autometer gauge is only capable of reading 1600 F. I use Apexi gauges as normal highway temps are around 850 C with spikes to 940 C. I've seen readings around 1100 C but that was a problem with the car. (This is how I knew something was wrong) I would certainly look into a 1200 C gauge.

BTW 850 C is about 1560 F. Your normal highway operating temp is going to register on the edge of the autometer gauge, not leaving any room for WOT runs or problem solving.

If you are running a good tune, your car should read highest temps after you let off the accelerator (assuming you drive hard)

Hope some of this helps.

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