any thoughts on the best location for an egt sensor. presently mine is in the manifold, just before the turbo. i'm worried about the sensor eventually burning/failing and sending bits into the turbo. also, are the temps here appropriate to measure? obviously, trends are useable, but how about the absolute numbers? i'm seeing high egt's here (1800F at wot ) despite rich a.f.r. (10:1).

not sure what to make of that.

tia
fabian

btw.....running streetport, apexi rx6, power fc, blah,blah. car only used for track (road racing)

 

You will hear mixed reviews, but the absolute best way to measure EGTs are to have a seperate sensor in each of the exhaust outputs on the exhaust manifold. With one sensor in the downpipe, most people mount their sensor close to the O2 bung, you will get an average between both rotors. Still a good safeguard way to measure though. Again, you will hear mixed reviews.

 

Your seeing high EGTs because your tuned rich. Back it off closer to 11 and it will get cooler.

I have mine mounted in the same location that you do. I have the Defi EGT(Greddy sensor is the same) and have never heard of one failing. However, I have heard of the apexi one failing on 2 different cars....so be forewarned.

 

anyone have trouble with an autometer egt?

 

hmmm...that doesn't sound right. i thought richer was cooler (to a point obviously)

i've had both the greddy and defi in this spot, and they were pretty similar.

does anyone have any thoughts on the high egt at this site. obviously, if i move the sensor to the downpipe, just aft of the turbo, the absolute temp will be lower.....but am i fooling myself and just making myself feel better because the number is lower?

what egt temps are you rx6 owners seeing at the manifold? at the downpipe?

fabian

 

1600 to 1650 deg F. before the turbo is what I normally run and that is acheived at 10.8 to 11.0 a/f at w.o.t. in 5th gear at 9000 rpm.

crispeed
87 RX-7 TII
9.204@150.47mph
2600lbs
un-tubbed

 

Timing too retarded along with too rich an a/f ratio would cause the egt's to climb also.

crispeed
87 Rx-7 TII
9.204@150.47mph
2600lbs
un-tubbed

 

The manifold seems to be the ideal spot for an EGT sensor. There are sytems available that will monitor multiple EGT sensors incase you would like to monitor each housing seperately. You may want to think about using water injection to keep combustion/exhaust temps down.

 

I will be adding a dual EGT monitor to my FD exhaust manifold BEFORE the turbo, I spoke to alot of guys on this subject as well as the speed shop that I purchased it from(S&K Speed, Rockville Centre, NY), and they highly recomended the Percy D.E.T.I. unit, here is the link to it:

http://www.percyshp.com/digextemin.html

 

IMO, monitoring EACH rotor separately is a big part of even monitoring EGT temps at all. Otherwise, as already stated, you are just getting an average between the two. I hear of a lot of guys finding a good difference between the 2 rotors. So one rotor could be dangerously high and the other rotor could be significantly cooler; if you were running just one probe and seeing an average, then you wouldn't know that.

From what I was told by a guy who has been running 25+ PSI for years, he recommended mounting each probe just outside each rotor, about an inch out, in the manifold.

Just after I decided to go with the Westach system, my buddy at Mazdatrix told me they just worked out a deal with Westach to mfg the gauges specifically with a higher temp range to better suit the rotary engine. So I believe Mazdatrix is now selling them.

Here is the Westach Dual EGT gauge I went with: http://www.motocarrera.com/temper3.jpg

Here is a website:http://www.motocarrera.com/temperat.htm

 

You think that display would mount nicely next to my PFC commander???

 

Do you think the motorcycle calibration on the http://www.motocarrera.com/temperat.htm gauge would be accurate on the fd's?

 

When I wrote that post last night at 3:00AM (after a girl left here ), I was tired and didn't notice that the link I provided was for the gauge WITH the warning light; the one I got and the one Mazdatrix will be selling does NOT have that warning light.

Anyhow, I would not use the gauge that is calibrated for the motorcycle. I think that gauge would be close to being max'd most of the time. I would either get it from http://www.mazdatrix.com since they already have specially calibrated ones for the rotaries, or call http://www.westach.com/ direct and they will make it for you. I spoke to a guy at Westach and he was SUPER cool, willing to help in any way.

-Tom

 

if you noted significantly differing rotor egt's , what would you do? how do you start troubleshooting that problem? what temperatures at the rotor exhaust port would cause worry? do downstream issues (ie turbo size, exhaust diameter/type) cause changes in egt?

i'm still worried about my high average egt at the turbo inlet.

tia
fabian