Can I get a difinitive answer on EGT probe location?

xrocket21 · 02-19-2008, 07:34 AM

My inclination is to ask my tuner, and do what he says. He says mount it in the DP. I have always heard 6" from the exhaust port of #4, which I believe is drivers side, closest to firewall.

My searching shows many people saying that the DP is a terrible place to put it. And the reasons make sense to me. Theres too much temp change from the exhaust port till after the turbo.

Tuner says they put it in the DP due to varying qualities of EGT probes, and fear that it will break off/damage the turbo.

So once and for all, DP for safety? or header for accuracy?

Gauge is STRI as well.

Also, im getting gruppe-s coated headers, stri directions say to drill and tap. If I weld in a bung, it looks like the probe wouldnt reach in far enough. Drill and tap work okay?

THANKS

diabloadsit · 02-19-2008, 07:41 AM

Do it in the headers. How often do probes brake off? What is going to brake it. Get a Carbing metal undertray and then nothing can harm it.

diabloadsit · 02-19-2008, 07:41 AM

Plus your gauge will work like it is supposed to.

BBBsti LTD · 02-19-2008, 10:31 AM

Put it in the manifold 6" or closer in cyl 4.

helifreak · 02-19-2008, 12:21 PM

I like to know some more info on this subject as well. My Gruppe-S jet hot coated header does not have a egt bung but I have a larger up pipe with an egr bung I will install when I upgrade my turbo. I've heard that this location is not ideal but what other options do I have besides grinding the $175 coating off enough to weld a bung in the header leaving an unprotected area in the coating.

diabloadsit · 02-19-2008, 12:59 PM

Quote:

Originally Posted by helifreak

I like to know some more info on this subject as well. My Gruppe-S jet hot coated header does not have a egt bung but I have a larger up pipe with an egr bung I will install when I upgrade my turbo. I've heard that this location is not ideal but what other options do I have besides grinding the $175 coating off enough to weld a bung in the header leaving an unprotected area in the coating.

Sorry you have no more options if you want it to work right.

helifreak · 02-19-2008, 05:55 PM

How important is a egt gauge anyway why not use an a/f instead? I would think an a/f would be a better indicator.

***MacSTi*** · 02-19-2008, 05:57 PM

EGT is vitally important because this will not translate into A/F ratios and a High EGT could be bad and a early clue to running too lean.

KiR DieseL · 02-19-2008, 07:39 PM

In the HEADER

/Thread

Mine is also placed there as well.

White Devil · 02-21-2008, 05:40 AM

Up pipe

Reason I say this is yea 4 does run the hottest BUT you are only measuring the egt from 4. If you have a fouled plug adn say 3 is running really lean your not going to know. I say measure the egt as a whole not just one cyl cause then you might be asking for trouble.

xrocket21 · 02-21-2008, 06:09 AM

Which one is cyl 4?

White Devil · 02-21-2008, 06:17 AM

4 is driver side closest to the firewall

from the driver seat
2 1
4 3

helifreak · 02-21-2008, 06:59 AM

Why is it that 4 runs the hottest?

White Devil · 02-21-2008, 07:26 AM

That i couldn't give you a answer to and be comfortable with teh answer I give you. I can find out though

helifreak · 02-21-2008, 09:06 AM

Maybe it has do do with the fuel rail issue in which one cylinder runs a bit leaner than the others under hard acceleration. I had read about this subject on here and some were saying that it has to do with the design of the stock fuel rails does not evenly distribute the fuel to all cylinders.

02-19-2008, 07:34 AM	#1
xrocket21 The Next Petter Solberg Car: 2005 STI Fav Mod: Methanol Location: Boston area Posts: 935 Join Date: Feb 2005 Trader Rating: (5)	Can I get a difinitive answer on EGT probe location? My inclination is to ask my tuner, and do what he says. He says mount it in the DP. I have always heard 6" from the exhaust port of #4, which I believe is drivers side, closest to firewall. My searching shows many people saying that the DP is a terrible place to put it. And the reasons make sense to me. Theres too much temp change from the exhaust port till after the turbo. Tuner says they put it in the DP due to varying qualities of EGT probes, and fear that it will break off/damage the turbo. So once and for all, DP for safety? or header for accuracy? Gauge is STRI as well. Also, im getting gruppe-s coated headers, stri directions say to drill and tap. If I weld in a bung, it looks like the probe wouldnt reach in far enough. Drill and tap work okay? THANKS This ad is not endorsed by this member. Please register or login to hide this ad.

02-19-2008, 07:41 AM	#2
diabloadsit STI POWWA Car: 06 Subaru WRX STI Fav Mod: My 20g Location: Topsham Posts: 723 Join Date: Jun 2006 Trader Rating: (6)	Re: Can I get a difinitive answer on EGT probe location? Do it in the headers. How often do probes brake off? What is going to brake it. Get a Carbing metal undertray and then nothing can harm it.

02-19-2008, 07:41 AM	#3
diabloadsit STI POWWA Car: 06 Subaru WRX STI Fav Mod: My 20g Location: Topsham Posts: 723 Join Date: Jun 2006 Trader Rating: (6)	Re: Can I get a difinitive answer on EGT probe location? Plus your gauge will work like it is supposed to.

02-19-2008, 12:21 PM	#5
helifreak Junior STI Driver Car: WR Blue 05 Sti Location: Dallas, TX Posts: 135 Join Date: Jun 2007 Trader Rating: (0)	Re: Can I get a difinitive answer on EGT probe location? I like to know some more info on this subject as well. My Gruppe-S jet hot coated header does not have a egt bung but I have a larger up pipe with an egr bung I will install when I upgrade my turbo. I've heard that this location is not ideal but what other options do I have besides grinding the $175 coating off enough to weld a bung in the header leaving an unprotected area in the coating.

02-19-2008, 05:55 PM	#7
helifreak Junior STI Driver Car: WR Blue 05 Sti Location: Dallas, TX Posts: 135 Join Date: Jun 2007 Trader Rating: (0)	Re: Can I get a difinitive answer on EGT probe location? How important is a egt gauge anyway why not use an a/f instead? I would think an a/f would be a better indicator.

02-19-2008, 10:31 AM	#4
BBBsti LTD Professional STI Driver Car: 2007 STi LTD Fav Mod: Stg. 2 with Knocklite Location: Boricua en So Cal Posts: 440 Join Date: Apr 2006 Trader Rating: (0)	Re: Can I get a difinitive answer on EGT probe location? Put it in the manifold 6" or closer in cyl 4.

02-19-2008, 05:57 PM	#8
*MacSTi* I has BOOST! Car: 2005 Aspen White STi Fav Mod: LightWerkz Projector Retrofit Location: Somerset, NJ Posts: 1,936 Join Date: Feb 2006 Trader Rating: (12)	Re: Can I get a difinitive answer on EGT probe location? EGT is vitally important because this will not translate into A/F ratios and a High EGT could be bad and a early clue to running too lean.

02-19-2008, 07:39 PM	#9
KiR DieseL Silver Member Car: Aspen White 06 STi Fav Mod: Teh Mature Diffuser Will Return! Location: Queens NYC Posts: 2,717 Join Date: Feb 2006 Trader Rating: (0)	Re: Can I get a difinitive answer on EGT probe location? In the HEADER /Thread Mine is also placed there as well.

02-21-2008, 05:40 AM	#10
White Devil Banned Car: 07 Fav Mod: Coming Soon Posts: 24 Join Date: Feb 2008 Trader Rating: (0)	Re: Can I get a difinitive answer on EGT probe location? Up pipe Reason I say this is yea 4 does run the hottest BUT you are only measuring the egt from 4. If you have a fouled plug adn say 3 is running really lean your not going to know. I say measure the egt as a whole not just one cyl cause then you might be asking for trouble. Last edited by White Devil : 02-21-2008 at 05:53 AM.

02-21-2008, 06:09 AM	#11
xrocket21 The Next Petter Solberg Car: 2005 STI Fav Mod: Methanol Location: Boston area Posts: 935 Join Date: Feb 2005 Trader Rating: (5)	Re: Can I get a difinitive answer on EGT probe location? Which one is cyl 4?

02-21-2008, 06:17 AM	#12
White Devil Banned Car: 07 Fav Mod: Coming Soon Posts: 24 Join Date: Feb 2008 Trader Rating: (0)	Re: Can I get a difinitive answer on EGT probe location? 4 is driver side closest to the firewall from the driver seat 2 1 4 3

02-21-2008, 06:59 AM	#13
helifreak Junior STI Driver Car: WR Blue 05 Sti Location: Dallas, TX Posts: 135 Join Date: Jun 2007 Trader Rating: (0)	Re: Can I get a difinitive answer on EGT probe location? Why is it that 4 runs the hottest?

02-21-2008, 07:26 AM	#14
White Devil Banned Car: 07 Fav Mod: Coming Soon Posts: 24 Join Date: Feb 2008 Trader Rating: (0)	Re: Can I get a difinitive answer on EGT probe location? That i couldn't give you a answer to and be comfortable with teh answer I give you. I can find out though

02-21-2008, 09:06 AM	#15
helifreak Junior STI Driver Car: WR Blue 05 Sti Location: Dallas, TX Posts: 135 Join Date: Jun 2007 Trader Rating: (0)	Re: Can I get a difinitive answer on EGT probe location? Maybe it has do do with the fuel rail issue in which one cylinder runs a bit leaner than the others under hard acceleration. I had read about this subject on here and some were saying that it has to do with the design of the stock fuel rails does not evenly distribute the fuel to all cylinders. This ad is not endorsed by this member. Please register or login to hide this ad.