EGT on 20 thou overbore

chanders · 08-10-2008, 11:49 PM

Hey guys, I just rebuilt my 2.0 V7 JDM STI with a 20 thou overbore and was wondering what the EGT should be.

I am currently breaking in the motor so I am not running any boost.

I have noticed while driving (in no boost) at about 60mph constantly the EGT approaches 1400F. Is this normal for an engine with the slightly greater compression ?

Any input would be great, thanks!

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mick_the_ginge · 08-11-2008, 10:46 AM

Depending on where the EGT sensor is that sounds about right to me, I used to see 1525 on cruise. What you need to do is check the fueling and timing under those conditions. Under cruise you should be at 14.7:1 AFR and loads of timing.

chanders · 08-11-2008, 02:29 PM

^^ Thanks Mick. The sensor is actually located in the exhaust manifold about 4" from the flange. I am yet ti install my wideband to determine the AFR's in that area.

Thanks for your input. Anyone else with some info?

remowgn · 08-11-2008, 08:40 PM

Quote:

Originally Posted by chanders

^^ Thanks Mick. The sensor is actually located in the exhaust manifold about 4" from the flange. I am yet ti install my wideband to determine the AFR's in that area.

Thanks for your input. Anyone else with some info?

I see numbers in line with what you're getting with my stock EJ205. It's completely normal to have high EGT's at cruising... with the ECU keeping things at stoich and a comparatively low amount of air going through the motor, they will be right up there. It's nothing to worry about and is actually a good thing, as it means you're getting a more complete burn and the cats (well, if you have any) will do their job better.

chanders · 08-11-2008, 10:55 PM

^^ Thanks. I was beginning to get a little worried when I saw 1400F!!

08-10-2008, 11:49 PM	#1
chanders Scooby Newbie Member#: 131319 Join Date: Nov 2006 Chapter/Region: International Vehicle: 2003 JDM STI World Rally Blue	EGT on 20 thou overbore Hey guys, I just rebuilt my 2.0 V7 JDM STI with a 20 thou overbore and was wondering what the EGT should be. I am currently breaking in the motor so I am not running any boost. I have noticed while driving (in no boost) at about 60mph constantly the EGT approaches 1400F. Is this normal for an engine with the slightly greater compression ? Any input would be great, thanks! * Registered users of the site do not see these ads.

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08-11-2008, 10:46 AM	#2
mick_the_ginge Citizen Mick Member#: 27646 Join Date: Oct 2002 Chapter/Region: NWIC Location: Portland, Oregon Vehicle: 2003 Sleeved 2.5 Oil Dry Sump Goodness	Depending on where the EGT sensor is that sounds about right to me, I used to see 1525 on cruise. What you need to do is check the fueling and timing under those conditions. Under cruise you should be at 14.7:1 AFR and loads of timing.

08-11-2008, 02:29 PM	#3
chanders Scooby Newbie Member#: 131319 Join Date: Nov 2006 Chapter/Region: International Vehicle: 2003 JDM STI World Rally Blue	^^ Thanks Mick. The sensor is actually located in the exhaust manifold about 4" from the flange. I am yet ti install my wideband to determine the AFR's in that area. Thanks for your input. Anyone else with some info?

08-11-2008, 10:55 PM	#5
chanders Scooby Newbie Member#: 131319 Join Date: Nov 2006 Chapter/Region: International Vehicle: 2003 JDM STI World Rally Blue	^^ Thanks. I was beginning to get a little worried when I saw 1400F!!