I know these are only really effective if you can place one in each runner, but I would like just one, (would have picked up the glowing manifold). Question I have is where is the an ok location, is downpipe right after turbo ok?


I thought about the runner, however any tapping would leave metal flakes behind that would go into the turbo correct? (removing manifold is not going to happen for this, at least not now)

 

Installing EGT probe is in the exhaust side not in the intake side.

Considering there are metal debris when you are drilling, it will not affect the turbo. The metal debris will blown away to the exhaust and melt at the catalytic. Use a small magnet while drilling or constantly clean the area.

I have a brand new spare OMOri that I did not use it. Your's for $80.00. I paid $180.

 

If you don't want to remove manifold, I will put it right after turbo(install on down pipe). I wouldn't take a chance drill hole when everything is in place. Just my two cents.

 

I ran 4 with my last setup and it is definatly great for diagnostics, however I would not recomend it for everyday use. If I were you I would buy on the AEM EGT's which are not the standard thermocouple type so they plug directly into the AEM. The big advantage is being able to trim fuel and have warings set up with issues such as the ones you have been having.

 

[QUOTE=dsddcd,Jun 28 2010, 03:46 AM] I ran 4 with my last setup and it is definatly great for diagnostics, however I would not recomend it for everyday use.

 

interesting...............

How does the AEM work if there is not thermocouple?

I just want one, just in case my Manifold decides to play glow in the sark again.

What are the typical EGT's anyway (idle, boost, etc...........)

 

I've heard 1-3 inches after the turbo is a good spot...mine is about an inch after.

Common temps (in F):

Idle ~400-600F (takes a long time to cool down to this temperature if you've been driving for a while)
typical driving ~1000F
highway ~1200F
Lots of boost / very fast highway driving ~1500+

 

cool, thanks Jon.............

 

Recommended EGT probe location is about 4" ~ 6" from the exhaust port on the header runners. (if there's a cylinder that is known to run "leaner" on a particular engine model, then that's the one to measure the temps at)

I've read that EGT temps drop about 200F after the turbo, so yes, you can mount the probe there, but keep in mind to add ~ 200F to the measured EGT's and not to exceed ~ 1500 to 1600F as stated before. I would prefer to mount the probe on the header ~6" from exhaust port since that would allow you to read temps as close as possible to actual temps since it's hard to know what the temperature drop is for every header/turbo setup (different since it is runner length and turbo size dependent)

Monitoring EGT's at that location is the better option since you want to make sure you are not exceeding ~ 1650 to 1750 F (I believe that's the "recommended" limits)
Anyway research some more to confirm EGT location and temps.

 

EGTs while at Talladega Gran Prix Raceway on June 6th 2008
minimum of 20 minute run groups
93 Deg F
Humidity varied 50-60%
A/F are in the 12.1 - 12.5 depending on boost and RPM

EGTs on track were in the 820C (1508F) and was for the most part constant (within 10C)
Now with the final timing curve EGTs average 780C (1436 F)
Hiway at constant throttel at 80mph ( 4.4gear) 700C (1292F)



DEFI EGT probe is located about 1" from the final merge collector on the header.
This gives an average temp across all 4 cylinders but is not as quick to respond if it was placed closer to the head. However since that was done on the track the probe had time to reach the and hold the average peek EGT temp for all 4 cylinders.
Header is wrapped extensively with 2 layers of Thermotech.




BTW the get the lower EGTs timing was advanced 2 to 3 degs from where it was on the 1508F reading)