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RX-7 3rd Gen Specific (1993-2002) RX-7 1993-2002 Discussion including performance modifications and Technical Support Sections.

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Old 09-17-2011, 01:45 AM   #1
dudemaaan
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Quote:
Originally Posted by RICE RACING View Post
word of warning on these sensors for you people who actually drive your cars!

These sensors WILL fail after around 10,000km of use. Because of the exposed element and the pulsing nature of the rotary engine (and maybe the effect of over 30psi intake manifold pressure!) the sensor wires DO fatigue and break resulting in the AIT sensor going open circuit (showing -40 deg C lol) .....

I have seen this happen over 2 of these sensors now, but unlike most I do actually drive my rotary daily! and do allot of testing kilometers !!!

I have another supplier in the U.K. who sells a slightly different version of this open AIT sensor and I am doing durability trials on these across a various range of customer cars and mine as well.

Will update when we accumulate some more real world testing
I call bullshit on this one. I've sold over 400 of these sensors over the last 3 or so years and had only 1 sensor reported failed due to being exposed to extreme heat from a heatgun. I run 26 psi daily in my rx7 and have put steady miles on the car in the last several years. Not to mention the thousands of people that run open element gm style sensors in a wide range of high boost vehicles. I respect your knowledge pete, but knocking products to push your own is low.
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Old 09-17-2011, 02:03 AM   #2
RICE RACING
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Quote:
Originally Posted by dudemaaan View Post
I call bullshit on this one. I've sold over 400 of these sensors over the last 3 or so years and had only 1 sensor reported failed due to being exposed to extreme heat from a heatgun. I run 26 psi daily in my rx7 and have put steady miles on the car in the last several years. Not to mention the thousands of people that run open element gm style sensors in a wide range of high boost vehicles. I respect your knowledge pete, but knocking products to push your own is low.
wtf?

The sensors failed exactly as I described! hence I posted about it!

If you don't cover as many km's like most rotary owners then I agree you wont fatigue the wires.

It's pretty easy to see it happen, and no heat gun is needed! I can show you a computer data log showing exactly how many hours the sensor was used and the highest temperature recorded off it if you are still indoubT !

NO NEED TO BE A **** A SLUR MY FACTUAL TEST AND WARNING TO OTHERS AS BULLSHIT THANKS!!!
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Last edited by RETed; 09-20-2011 at 09:22 AM. Reason: no need for vulgarity
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Old 09-17-2011, 02:07 AM   #3
RICE RACING
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P.S. I don't sell the other sensors either BTW!

They will most likely fail as well in time due to being weak open element types too! There is a reason Mazda did not use these in the rotary engine and I can see why now after accumulating allot of testing hours and time and kilometers on them.

The same fatigue happens to open element EGT wires as well for your information, and no I dont sell others ether of those. Just passing on real knowledge and testing which fuck all other people do or have the ability or running cars to do so.
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Old 09-17-2011, 02:18 AM   #4
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In the rotary engine especially the 13B-REW with its dynamic chamber intake manifold and where the AIT sensor is placed it sees large "pulses" and these over time flex the sensor wire back and forth, you need to do many km's like I stated in my first post, and I guarantee you this will fatigue the wire or wires and it will go open circuit.

I have see this happen in egt sensors and also in these AIT sensors (if you sell them or not is not my issue nor my aim to warn people@) its just that this type of sensor WILL fail in a rotary engine over time.

Typically its happened on 2 different cars at around 10,000km covered range. both 13B-REW's with stock intake manifolds and positioned sensors. Take that for what you will. The sensor tips did not fall off into the motors but one wire on each sensor was broken due to the constant flexing the exposed sensor tip is subjected to. And as I stated its a well known fact that open element EGT sensor tips suffer the same failures due to pulsations breaking wires as well.

When the sensor goes south least the motor will run rich if you have the ECU set up correctly for it.
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