Welcome to the North American Subaru Impreza Owners Club Monday August 20, 2018
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Engine Management & Tuning

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 06-06-2004, 09:54 AM   #1
Amazake
Scooby Specialist
 
Member#: 9889
Join Date: Sep 2001
Chapter/Region: NESIC
Location: 12.94 best ET 105.58 best trap
Default cobb stage II.... EGT.....yes, I am asking the age old question

2002 wrx sedan
cobb stage II 93 octane map
omori EGT gauge tapped on driver's side manifold 2-4
hitting peak boost

peak egt @ LOAD 1575F-1600F on 93 octane map
on Stock map egt @ load 1400-1450F

SO plus 150F on the accessport stage II.

What is everyone else getting for egt's?

I have also have seen reports of egt in this range from accessecu / accessport users.


Reason I ask, is that many of the UTEC crowd I hang around with and trust have EGT's peaking @ the mid 1400F's


Through my searching I also find that people with the omori EGT gauge seems to have a higher EGT's. Is it because it has a wider range of temperature? more responsive? or a conspiracy theory?
* Registered users of the site do not see these ads.

Last edited by hnd-kla; 06-06-2004 at 10:10 AM.
Amazake is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 06-06-2004, 10:36 AM   #2
Uncle Scotty
*** Banned ***
 
Member#: 16200
Join Date: Mar 2002
Vehicle:
OK buy Nates beans
westcoastroasting.com

Default

1600F peak is all good.

Relax...
Uncle Scotty is offline   Reply With Quote
Old 06-06-2004, 05:03 PM   #3
Amazake
Scooby Specialist
 
Member#: 9889
Join Date: Sep 2001
Chapter/Region: NESIC
Location: 12.94 best ET 105.58 best trap
Default

Uncle - please tell me why you feel 1600F is "all good"

where as the UTEC crowd says 1600F is damn close to the edge?
Amazake is offline   Reply With Quote
Old 06-06-2004, 07:09 PM   #4
trustWRX
Scooby Specialist
 
Member#: 40431
Join Date: Jul 2003
Chapter/Region: SCIC
Vehicle:
2009 Scion XB

Default

I'm a Injen Turboback exhaust and Cobb Stage 2 91 octane map (stock uppipe w/ cat intact, turboback has no cats)

Boost peaks at 15.5Psi and EGT's dont seem to go past 1350. EGT probe is mounted 4" after the turbo.
trustWRX is offline   Reply With Quote
Old 06-06-2004, 07:19 PM   #5
WRX Jim
Scooby Specialist
 
Member#: 22321
Join Date: Aug 2002
Location: Germantown MD
Default

Quote:
Originally posted by trustWRX
I'm a Injen Turboback exhaust and Cobb Stage 2 91 octane map (stock uppipe w/ cat intact, turboback has no cats)

Boost peaks at 15.5Psi and EGT's dont seem to go past 1350. EGT probe is mounted 4" after the turbo.
thats why, its inaccurate. That means its after your downpipe.
WRX Jim is offline   Reply With Quote
Old 06-06-2004, 08:24 PM   #6
Uncle Scotty
*** Banned ***
 
Member#: 16200
Join Date: Mar 2002
Vehicle:
OK buy Nates beans
westcoastroasting.com

Default

Quote:
Originally posted by hnd-kla
Uncle - please tell me why you feel 1600F is "all good"

where as the UTEC crowd says 1600F is damn close to the edge?

Ya don't have a UTEC, now do ya...???

.....if 1600F is as high as it gets, then I think that's ok.....if it goes OVER that it ISN'T.

Do some more reasearch, and come to your own conclusion...and then call the Cobb boys and have them figure it out if ya think it's borked....that's what ya paid 'em for isn't it......
Uncle Scotty is offline   Reply With Quote
Old 06-06-2004, 08:25 PM   #7
Uncle Scotty
*** Banned ***
 
Member#: 16200
Join Date: Mar 2002
Vehicle:
OK buy Nates beans
westcoastroasting.com

Default

Quote:
Originally posted by trustWRX
I'm a Injen Turboback exhaust and Cobb Stage 2 91 octane map (stock uppipe w/ cat intact, turboback has no cats)

Boost peaks at 15.5Psi and EGT's dont seem to go past 1350. EGT probe is mounted 4" after the turbo.
An EGT in the DP is an exercise in futility, and useless as well.
Uncle Scotty is offline   Reply With Quote
Old 06-06-2004, 08:28 PM   #8
Macabre
Scooby Specialist
 
Member#: 3841
Join Date: Jan 2001
Location: Sacramento, CA
Vehicle:
2004 WRX Wagon
UTEC+VF22+WI

Default

That's pretty hot.. but based on how lean people have been showing these maps to run, you shouldn't be too surprised. Obviously you're the only one that can decide if this is acceptable.
Macabre is offline   Reply With Quote
Old 06-06-2004, 08:59 PM   #9
Amazake
Scooby Specialist
 
Member#: 9889
Join Date: Sep 2001
Chapter/Region: NESIC
Location: 12.94 best ET 105.58 best trap
Default

Quote:
Originally posted by Uncle Scotty


Do some more reasearch, and come to your own conclusion...and then call the Cobb boys and have them figure it out if ya think it's borked....that's what ya paid 'em for isn't it......
Research is fine, I was hoping this thread would speed up the process a bit. I am not looking for a pat on the head, more of an idea how other owners of the Cobb accessport's EGT's are. Along with, what some of the more educated enige managemnet members think about an EGT of 1600F. I agree, I paid Cobb for the part, I am sure they will be of assistance. I aslo realize it is my decision on what is safe/along with how hard I push the car.

thanks uncle scotty you advise has alwats been appreciated

Quote:
Originally posted by Macabre
That's pretty hot.. but based on how lean people have been showing these maps to run, you shouldn't be too surprised. Obviously you're the only one that can decide if this is acceptable.
Could you send me a link to some information on the lean cobb accessport car (s), please? thanks for the input

I will have to find a way to do that on my impreza
Amazake is offline   Reply With Quote
Old 06-06-2004, 09:06 PM   #10
fastsubie
Scooby Specialist
 
Member#: 21999
Join Date: Jul 2002
Chapter/Region: Tri-State
Location: Central PA
Vehicle:
2017 Wrx
DGM

Default

I'm Cobb stg2 + an uppie. My EGT warning light set to 1600~f. It flickers on sometimes if I'm WOT on a 4th gear pull. Oh yea probe is installed on the casting bung on the driver side manifold.

-Fess
fastsubie is offline   Reply With Quote
Old 06-06-2004, 10:09 PM   #11
Weemus
Scooby Specialist
 
Member#: 16415
Join Date: Mar 2002
Chapter/Region: MAIC
Location: BMORE in the MD
Vehicle:
02 WRX+1.5XTR+E85=
WRBwhatothercoloristhere?

Default

I run stage 2 with perrin uppipe,txs exhaust. I run around 1400 cruising on the highway, 1450 up hills, and 1550 at wot. I have never exceeded 1575.(I have tried)
Weemus is offline   Reply With Quote
Old 06-07-2004, 01:31 AM   #12
HonduHunter
Scooby Guru
 
Member#: 28408
Join Date: Oct 2002
Chapter/Region: TXIC
Location: San Antonio, Tx
Vehicle:
2002 vf48ed WRX
OBP

Default

wow... i thought mine were pretty high. i am now reassured. i guess it wasnot just my car. i never see 1500. i guess ill just try harder.
HonduHunter is offline   Reply With Quote
Old 06-07-2004, 02:34 AM   #13
trustWRX
Scooby Specialist
 
Member#: 40431
Join Date: Jul 2003
Chapter/Region: SCIC
Vehicle:
2009 Scion XB

Default

For those questioning my EGT probe placement here is some resources:

"Mounting the probe too close to the piston or too far away will result in an incorrect reading. The probe needs to be located in the center of the manifold from all directions. Install the probe before reinstalling the manifold." - http://www.ultralightnews.ca/egt/egtwiringdia.htm

"The rule of thumb for probes placed after the turbo is that you never want to
see much more than 1350 for any extended length of time...."

http://www.audifans.com/pipermail/qu...er/061460.html

"If you want real EGT readings, they should be right outside the exhaust port in the header. If you put it down farther, then the exhaust gas has cooled off. This assumes you are using the EGT to understand if your A/F ratio is correct and what not. If you just want to impress your friends, leave it where ever you want."

http://forums.modulardepot.com/showthread/t-14901.html

That's what I came with just on a search. So after the turbo is not a terrible thing. It's just a guideline like the guy above said. If it's mounted after the turbo it should not exceed 1350 for a long period of time. Which it does not on mine so I'm fine but thanks for the concern

If Jaime from EasyStreet Motorsports said no more than 4" after the Turbo I won't question his judgment after all he does this for a living.
trustWRX is offline   Reply With Quote
Old 06-07-2004, 05:50 AM   #14
clamdip
Scooby Specialist
 
Member#: 18709
Join Date: May 2002
Default

hnd-kla: well, i'm running the cobb stage 2 and my egt's never exceed 850 *C. at cruise, i'm at about 700C and at WOT i'm just a little under 850C. because of the tune, you can really see it fattening out as the gas temps get higher. which constitues a good tune. thin down low helps turbo spool, and fatter up top to prevent knock. i also have my egt probe mounted about 4 inches from cylinder 1 and 4 so my readings are pretty accurate. maybe since you're running a higher octane map, it's a little higher. i don't think 1600F is high. it's pretty high, but i don't think it's very dangerous.

trustwrx: in terms of accurate readings, since you don't know how much the gases cool off after the turbo, if you have your probe tapped as close as possible to the cylinder, the temp of the gases would be more accurate. it's also good to have it there for tuning purposes, as you would want the most accurate temp reading when it comes to running leaner conditions.
clamdip is offline   Reply With Quote
Old 06-07-2004, 07:57 AM   #15
Zackbo
Scooby Specialist
 
Member#: 43151
Join Date: Sep 2003
Chapter/Region: South East
Location: Charlotte, NC
Vehicle:
04 STI
Kinda Silver-ish

Default

Quote:
Originally posted by clamdip
hnd-kla: well, i'm running the cobb stage 2 and my egt's never exceed 850 *C. at cruise, i'm at about 700C and at WOT i'm just a little under 850C. because of the tune, you can really see it fattening out as the gas temps get higher. which constitues a good tune. thin down low helps turbo spool, and fatter up top to prevent knock. i also have my egt probe mounted about 4 inches from cylinder 1 and 4 so my readings are pretty accurate. maybe since you're running a higher octane map, it's a little higher. i don't think 1600F is high. it's pretty high, but i don't think it's very dangerous.

trustwrx: in terms of accurate readings, since you don't know how much the gases cool off after the turbo, if you have your probe tapped as close as possible to the cylinder, the temp of the gases would be more accurate. it's also good to have it there for tuning purposes, as you would want the most accurate temp reading when it comes to running leaner conditions.
It would be impossible to have one egt probe mounted 4" from cylinders 1 and 4
Zackbo is offline   Reply With Quote
Old 06-07-2004, 08:04 AM   #16
Uncle Scotty
*** Banned ***
 
Member#: 16200
Join Date: Mar 2002
Vehicle:
OK buy Nates beans
westcoastroasting.com

Default

trustWRX...I don't care what 'Jamie' says......IMO an EGT probe in the DP is 100% useless.

Easy street may not want their BIG turbo FODded out if one before the turbo melts, but I say it's useless.
Uncle Scotty is offline   Reply With Quote
Old 06-07-2004, 08:45 AM   #17
clamdip
Scooby Specialist
 
Member#: 18709
Join Date: May 2002
Default

Quote:
Originally posted by Zackbo
It would be impossible to have one egt probe mounted 4" from cylinders 1 and 4
sorry, my bad, 2 and 4.
clamdip is offline   Reply With Quote
Old 06-07-2004, 08:46 AM   #18
clamdip
Scooby Specialist
 
Member#: 18709
Join Date: May 2002
Default

Quote:
Originally posted by Uncle Scotty
trustWRX...I don't care what 'Jamie' says......IMO an EGT probe in the DP is 100% useless.

Easy street may not want their BIG turbo FODded out if one before the turbo melts, but I say it's useless.
yes, i agree, in the downpipe is pretty useless, but to each his own.
clamdip is offline   Reply With Quote
Old 06-07-2004, 09:57 AM   #19
mbiker97
Scooby Guru
 
Member#: 7922
Join Date: Jun 2001
Chapter/Region: MWSOC
Location: Tucson
Vehicle:
04 CTS-V b/b/b
99 GMC Highrider

Default

With my ECUtek tune I generally reach peak right around 1600*F. My tuner (www.payntechnologies.com) believes I may be seeing artificially higher readings because of where my sensor is tapped. It is right at a turn so the exhaust moving around the turn produces friction which in turn produces heat. I have been running this tune for almost a year and my compression and everything is still good.
mbiker97 is offline   Reply With Quote
Old 06-07-2004, 12:25 PM   #20
trustWRX
Scooby Specialist
 
Member#: 40431
Join Date: Jul 2003
Chapter/Region: SCIC
Vehicle:
2009 Scion XB

Default

Just let it go. I got that EGT gauge when the car was stock. I knew what it read at WOT before any mods. Now that I'm modded I know what to compare it to.
trustWRX is offline   Reply With Quote
Old 06-07-2004, 05:48 PM   #21
Amazake
Scooby Specialist
 
Member#: 9889
Join Date: Sep 2001
Chapter/Region: NESIC
Location: 12.94 best ET 105.58 best trap
Default

Quote:
Originally posted by mbiker97
It is right at a turn so the exhaust moving around the turn produces friction which in turn produces heat.
I think that just slows the air flow, not create friction.
Amazake is offline   Reply With Quote
Old 06-07-2004, 07:52 PM   #22
03WRXMA
Scooby Guru
 
Member#: 35081
Join Date: Apr 2003
Chapter/Region: NESIC
Location: CT
Vehicle:
2012 WRX
WRB

Default

Quote:
Originally posted by trustWRX
Just let it go. I got that EGT gauge when the car was stock. I knew what it read at WOT before any mods. Now that I'm modded I know what to compare it to.
Granted, just dont trust the reading as a peak reading/dont use it to tune with because as mentioned above you cant take X number pre turbine, and add it to the post-turbine number since X is unknown.

FWIW I see a peak of 1550 on my Omori, same place as Chris's probe on my Stg4/UTEC car.
03WRXMA is offline   Reply With Quote
Old 06-07-2004, 09:28 PM   #23
Uncle Scotty
*** Banned ***
 
Member#: 16200
Join Date: Mar 2002
Vehicle:
OK buy Nates beans
westcoastroasting.com

Default

I'd pull the EGT and put a wideband o2 in it's place....
Uncle Scotty is offline   Reply With Quote
Old 06-07-2004, 09:44 PM   #24
clamdip
Scooby Specialist
 
Member#: 18709
Join Date: May 2002
Default

i think as long as the tune is good as well as the tuner, you shouldn't worry too much about the EGT's. as i think trey from cobb actually stated that having a good tune and somewhat high egt's is nothing to really worry about. if you have a datalogger, check your timing map at higher rpm's and that should give you a good idea of your egt's and may answer some of your questions.
clamdip is offline   Reply With Quote
Old 06-08-2004, 01:51 AM   #25
BROKENWRX
Scooby Newbie
 
Member#: 3741
Join Date: Jan 2001
Chapter/Region: SCIC
Location: Australia/Usa
Vehicle:
Dont need one I play
with other peoples cars!

Default

I find that tunning with one egt in one exhaust port to be useless!
When tunning wrx's with the motec I use the exhaust temp probes to see what cylinders are running higher exhaust temp and make the necessary adjustments to the fuel trim on that cylinder.

Exhaust temp probes eventually fail, and I have seen them go through to many turbos to even want to think about placing one before a turbo.

Like trustWRX said, he had it on before the mods so he knows what to compare it too.
BROKENWRX is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Well the age old question legacytuner671 Member's Car Gallery 70 07-24-2007 05:04 PM
It's time to answer the age old question..... wagonmasta Off-Topic 13 02-13-2007 02:21 PM
Cobb Stage II + EGT gauge voam Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 18 06-08-2004 03:59 PM
The age-old question - what color rims should I get? Patrick Olsen Interior & Exterior Modification 20 07-06-2001 10:24 PM

All times are GMT -4. The time now is 08:31 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2018 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.