Fast reacting IAT sensor replaces stock sensor
 

I've found a fast reacting air temp sensor to replace the slow stock sensor, I can get a good price if anyone is interested. There is a pretty detailed thread on the other forum, I'll go into more detail about it later. Right now i'm on my cell or i would post more. Pm or email me if you want one or more details. Dudemaaanownsanrx7@yahoo.com

Look forward to reading about how this works.

Here is what was posted on the other forum by me.

"On and off over the last several months I've been looking for a fast reacting air intake sensor to replace the slow stock one. A brief overview can be found in the PFC section.

I finally found a part number, and it can be found online for a little over $50 shipped without pigtail. I have a friend that can get them to me for around $35 (I will pass this on to others) I went ahead and got one to test since I had the option of returning it if it didn't work. Well it came in yesterday and I did a series of tests according to the FSM to determine if it was a suitable replacement. Here is what I found.

Results:

FSM STOCK SENSOR RESISTANCE.............................NEW FAST REACTING SENSOR

@68 *F (20c) 2.20 - 2.70 Ohms..................................Tested @68 *F (20c) = 2.27 Ohms
@176*F (80c) 0.29 - 0.35 Ohms.................................Tested @176*F (80c) = 0.34 Ohms

As you can see the sensor falls in the acceptable resistance range for both temperature tests, it has the exact same resistance curve as the stock sensor! This means is we can use this sensor to replace the slow stock sensor, while still sending the ecu the correct temp readings. It's a perfect replacement.

Heat soak issues won't be an issue because the sensor changes so rapidly that once colder air goes past the IAT, the ecu knows this and can add the appropriate amount of fuel. The advantages are a safer, and more precise tune with less need for a safety net. It's commonly known that the stock sensor heat soaks, especially when sitting for awhile or in stop and go traffic. Then once you take off, because the stock sensor is sluggish it's still reading hot air when the air is actually much cooler. This means the tune is either now on the lean side, or if tuned with a large safety margin it's right where it should be. That means in some situations you're not making as much power, and some situations the engine is in more danger.

With a sensor that reacts quickly, you can tune the engine for what it needs based on the actual temperature and actual density of the air. Often times I had to wait several minutes after sitting in a parking lot before I could stomp on it because the AIT was reading way high and I didn't want to boost until they dropped where they should be.

The sensor uses the same thread pitch as stock, and a common bosch connector. If anyone else wants one send me a PM and I'll see about getting some more for other people. This will work on any ECU that uses the stock sensor, even including the stock ECU. I took some pics of the tests performed. If anyone wants more information or pics let me know."

I will include several pics that are scattered around on the other forum. This will include pics taken from my testing, pics of the exact same triumph senor found in my motorcycle, pics of my first order and shipment of sensors, and a graph comparing the reaction of the stock sensor to the fast sensor. Feel free to ask questions or PM/email me to get information on an exact price for the sensor and bosch connector shipped.
Brent

Please note the pics are not in any particular order, click to enlarge them.

http://i10.photobucket.com/albums/a1...h_DSC00383.jpg
http://i10.photobucket.com/albums/a1...h_DSC00384.jpg
http://i10.photobucket.com/albums/a1...h_DSC00385.jpg
http://i10.photobucket.com/albums/a1...h_DSC00392.jpg
http://i10.photobucket.com/albums/a1...h_DSC00397.jpg
http://i10.photobucket.com/albums/a1...h_DSC00398.jpg
http://i10.photobucket.com/albums/a1...ponseCurve.jpg
http://i10.photobucket.com/albums/a1...h_DSC00378.jpg
http://i10.photobucket.com/albums/a1...h_DSC00379.jpg
http://i10.photobucket.com/albums/a1..._DSC003701.jpg
http://i10.photobucket.com/albums/a1..._DSC003741.jpg
http://i10.photobucket.com/albums/a1...h_DSC00372.jpg
http://i10.photobucket.com/albums/a1...h_DSC00373.jpg

I'm in!

Sounds like a very nice find. I like that you don't have to relocate it. How much are you selling them for?

They are around 42 for both the sensor and connector shipped in the 48 states.

Will this work on any 13B? or is it REW-specific?

count me in.

Look forward to getting this on the car in a week or two.

I was talking to Dale about this..

I'm in!

It will work with any setup that uses the same sensor as a stock fd. Some people have converted stuff over to use the pfc on older rx7s and this iat sensor would work.

Everyone that ordered after the 22nd will be having their sensors shipped tomorrow. Any orders prior to the 22nd already went out.

All sensors were shipped out monday. There were several that were ordered on and after the 22nd and i had to wait for more pigtails to arrive before shipping the orders out. So if you sent a payment no worries as your sensor is on its way.

Received mine. Look forward to putting it in.

Awesome

I also picked up this censor from him. I cant wait to install it.Thanks dude- for the 2nd time lol.

Got it, thanks, perfect timing since my stock AIT is acting up on me lately.

glad to hear it guys

can i still buy this?

Yes sir

get me some info

Alright drop me a pm. Im on my cell right now and it's not letting me pm.

Installed, instantly idles smoother since the temps are reading accurately compared to my stocker. Once I install my new bumper I will drive around and do some data logs to see how it performs. Thanks.

http://rotarycarclub.com/rotary_foru...1&d=1247585997

Awesome glad it's working well for you too

This sensor will most likely work on the RX-8 as well (the voltage ranges look identical).
So, for the boosted 8's, this is a great option.

FWIW, it will also work on the KL engine Mazdas (MX-3, MX-6, 626, 929, Millenia, etc.).

Thanks for the info i didn't know the rx8 used the same resistance values as the rx7

hey anyone done more testing using the new sensor? just like to hear the results people are having.

I'll take one if there still available.

Thanks,
~Luke

Yeah I still have several available, drop me a PM or email if anyone is interested.

I need one, hit me up.

So I tried to go to the thread on the evil forum and update my post, but I cannot access it anymore....what happened there? I take it the little dispute with Johnathan F caused a ruckus?

I received my sensor and was able to put it in a couple of weeks ago. I'm quite happy with the performance. It was interesting that I installed it the day before I finished up my water injection install. Before the W/I I could do a 2nd thru 3rd gear pull and watch my intake temps go up about 5 degrees Celsius. After W/I they would stay rock solid even thru a 3rd and 4th gear pull. On the highway if I just roll into the boost enough to activate the W/I I can watch the temps go down.

They said they deleted it cause it was free advertising and they don't allow it. It's no different then threads on widefoot mounts, hd water injection kits, and a dozen other products that are discussed over there. I was very unhappy about it since everyone was just getting theirs and starting to report back on the results.

Thanks for posting your results over here.

sounds like the new 7club. :dunno: I might end up ordering one soon. You still have some left?

Yeah i still have some. Let me know when, and i'l get it out to ya.

I got mine in! Got it very quickly too. I won't be able to test it until the
spring though.

Thanks!!!

Got mine installed today. A bit of a pain to get to, but I uncovered a bad vacuum leak in the brake booster line in the process. Two birds, one stone. Gotta like that. Haven't driven it yet, but it started up and idled well. And measued the correct air temperature :-)

Dave...

Good, glad everyone is getting them quickly. Look forward to hearing everyones results.

I installed the sensor today. The only problems I had were getting my hands/fingers behind/under the UIM to remove the connector from the OE sensor, and to splice the new connector to the harness. I really like the new connector - it seems much easier to connect/disconnect than the OE.

I may be imagining things, but after heat-soaking on purpose to test the effect, I think the engine is now more responsive to throttle than it was with the OE sensor under similar conditions.

Thanks for your help in locating and selling these!

I'll keep you updated if anything interesting happens related to the sensor.

I've had a few people say the same thing about better response. Are you on the stock ecu or pfc i cant remember? I would have to look again but i believe at a certain air temp the ecu starts pulling timing, with a faster sensor it would get back to cooler temps sooner and the timing increase could be why people are feeling the increased response. Either way the sensor works way better then stock and is only a good thing as far as the tune is concerned. Thanks for the feedback on it.

I have the stock ECU - what you said makes sense.

Dave