EGT optimal temp?
01-08-2002, 11:05 AM
#1
New Member
Thread Starter
Join Date: Apr 2001
Posts: 167
Likes: 0
Received 0 Likes
on
0 Posts
EGT optimal temp?
Im done with chip tuning so Im going manual, if i nuke the ko3 screw it, i hate it anyways =P
Just wanting to know what is considered optimal/dangerous etc. egt is going right after turbo behind O2 (i moved the cat under the car)
Just wanting to know what is considered optimal/dangerous etc. egt is going right after turbo behind O2 (i moved the cat under the car)
01-08-2002, 09:25 PM
#4
AudiWorld Super User
Join Date: Jul 2000
Posts: 5,291
Likes: 0
Received 0 Likes
on
0 Posts
You need to put egt sensor just after the turbine housing or just past the down pipe flange...
Ideally the sensor should go at exit of the turbine but you probably don't want to be drilling holes in your turbo housing.
01-09-2002, 04:09 AM
#5
New Member
Join Date: May 2000
Posts: 184
Likes: 0
Received 0 Likes
on
0 Posts
Measuring post turbine EGTs is no good...
...because there is no "reliable" data.
EGTs vary with load. All the EGT data you'll find is measured *before* the turbine. There is significant conversion of thermal energy (exhaust gas) into kinetic energy (turbine speed) occurring across the turbine scroll. The magnitude of "energy conversion" is directly proportional to engine load.
If you go to the trouble to mount an EGT gauge for tuning purposes, mount it *before* the turbine. Otherwise don't bother...unless you just want another needle to watch.
EGTs vary with load. All the EGT data you'll find is measured *before* the turbine. There is significant conversion of thermal energy (exhaust gas) into kinetic energy (turbine speed) occurring across the turbine scroll. The magnitude of "energy conversion" is directly proportional to engine load.
If you go to the trouble to mount an EGT gauge for tuning purposes, mount it *before* the turbine. Otherwise don't bother...unless you just want another needle to watch.
01-09-2002, 05:49 AM
#6
Member
Join Date: Mar 2000
Posts: 3,348
Likes: 0
Received 0 Likes
on
0 Posts
Industry standard is before the turbine.
You're trying to find out the temp of the gas going into the turbo. What comes out varies greatly depending on exhaust manifold, turbine size, etc.
01-10-2002, 06:25 PM
#7
AudiWorld Super User
Join Date: Jul 2000
Posts: 5,291
Likes: 0
Received 0 Likes
on
0 Posts
You're absolutely correct, my mistake. Wasn't thinking straight....
You definitely don't want to measure the temperature after the flow expands thru the turbine, where it looses energy. EGT should be measured at the exhaust port outlet on the head. Sorry for the miscommunication.
Trending Topics
01-11-2002, 08:00 AM
#9
Member
Join Date: Mar 2000
Posts: 3,348
Likes: 0
Received 0 Likes
on
0 Posts
What's the point of mounting a EGT gauge if you put the pyrometer behind the turbo?
It's purpose is for tuning and monitoring. The data given to you from the turbo manufacturers are all temps going into the turbine. The Data you collect when mounted behind the turbo is worthless. Either mount it before the turbine or don't use one if you're afraid it's gonna break.
01-11-2002, 10:17 AM
#10
New Member
Join Date: May 2000
Posts: 184
Likes: 0
Received 0 Likes
on
0 Posts
Cheap parts are usually the most expensive parts, aren't they?
And there are reasons why one EGT probe might be $70 and another EGT probe $250. (Material of construction-vs-end use)
On some projects, substituting cheap parts can be the "kiss of death". For the most part, you get what you pay for.
On some projects, substituting cheap parts can be the "kiss of death". For the most part, you get what you pay for.