the "next" in the thread title implies a series of thermocouple purchases. over the years i have found them to be a maintainence item. probably because rotaries run around 300 F hotter than piston engines. i installed a new set from The Sensor Connection in January and by November both had stopped working. i have generally sourced my thermocouples from Rick Lawler at EGT Technologies. (i do run two of his super duper two channel amps). after a brief discussion Rick suggested i try his "Super Series" thermocouples. he was pretty sure i wouldn't have to be calling him again in quite a while. if you go to their website, download the Motorsports Catalog you will get the skinny on them...i finally got around to unboxing and installing them today and when i took a close look i also concluded i probably wouldn't be calling Rick anytime soon.

take a look:





'probably don't have to do anymore typing other than to mention i paid what you will pay... $80 per

 

just curious to know what temps you’re actually seeing on flex fuel?

because there seems to be some discrepancies between what various people are reporting on here.
.

 

I cant get the Motorsports Catalog to download right now. So I'll ask you Howard.

Does the extra mass of the tip of that thermocouple effect response time?

 

Happy almost New Year to all

my move to NE Georgia is paying rotor dividends. while it is snowy and in the teens back in Wisconsin i just went for a pull in 56 degree Georgia weather... on December 31st!

as previously posted i swapped in some new thermocouples and immediately found about 100 diff between front and rear. i swapped the mini plugs to verify it wsn't a sensor issue (it wasn't) and then added 5% more fuel to my rear Primary injector... didn't touch any of the four secondary injectors as the diff was more at idle than in boost. 5% moved the needle so i did 10% and now am within 20 F. good enough.

at 20 PSI EFR 9180/6700 rpm i am at 1587. 40% E, 60% 93 pump

was posting in another thread re EMP/EMAP and noticed my EGTS were equal to the tenth.. maybe i will buy a lottery ticket... maybe not




re speed of this particular sensor, i suggest you email Rick Lawler. sales@exhaustgas.com. i have always found him to be very helpful and responsive.

 

Given a lot of people aren't running exposed tip I imagine the difference will be negligible compared to those.

 

Since I got the HC's recommended thermocouples, I figured I'd post here. MODs please advise if I should do otherwise.

What's the temp difference between exposed and covered/shielded sensor in an exhaust manifold? I realize that eventually, they both should be the same, but I'm trying to understand in practical use if there is a significant difference. More specifically, at a MAP of 10 psig I'm seeing right at 900C, would this substantially change if the sensors are covered/shielded?

 

and is the difference the response time?

 

Precisely. It was the tradeoff between response/thermal lag and durability that I had to consider. So I purchased an exposed sensor until I have my final tune. Then I'll swap out the exposed TC for an unexposed one for the sake of durability. Now that I think of it, I guess I'll have my answer then and share it here... with ya'll and myself.