TeamRX8

iTrader: (25)

umm, hopefully you do realize that for most people it doesn't have to match because we have access to the IAT sensor map in the PCM via Cobb etc. and just reprogram it to the calibration chart

Harlan

iTrader: (3)

I have no IAT cal in ATR 1.8.0.0-11359 06-08MT there may be a more up to date version now with the table added, but it's not what I have. I'd be very happy to be able to cal my own sensor.

9krpmrx8

iTrader: (46)

It's labeled IAT Calibration in mine. But if you have an 06+ then it may be labeled different, there are some differences in the maps and tables from 06'+ 6 port manuals.

TeamRX8

iTrader: (25)

You are correct, my bad. I never noticed that the IAT calibration map isn't listed in the Sensor Calibration Folder on the 2006-2008 ATR. Thanks for helping point this issue out.

Rotaman

In the wiring diagram that Brett posted of the IAT sensor from another Mazda.
Can anyone tell me what the Black/white wire is for on the Maf. I'm guessing its a power ground wire, but I would like confirmation that this is what it is.
I know that the Black/blue is 12v
Yellow/Red is Maf sensor wire - ?
Red/White is IAT sensor wire
Black/Green is sensor ground



Any help would be great.

Rotaman

Flashwing

Oh wow, totally forgot this thread.

I'm curious about the behavior that individuals have seen regarding ignition timing changes when performing this modification. Having tuned a Pettit Supercharged RX8 with the IAT moved post-blower, I had a hell of a time getting a predictable timing curve because the PCM seemed to pull timing as the IAT's went up. When IAT's reached 150+degrees around fuel cut, timing was being pulled in excess of 5 degrees.

It was mentioned to me that this modification caused "problems" with tuning, but I never got any details and because I don't have access to any modification tables with respect to timing vs. IAT, I could never confirm my theory.

In some respects, I would prefer the excess pull in timing with rising IAT because of how hot things get here in Arizona, but I'm not sure it is worth the trouble if that is the experience of other tuners.

FazdaRX_8

iTrader: (1)

Are u sure it wasn't knock sensor pulling timing?
Our knock sensor works it just doesn't tell you its working. Only pulls timing

9krpmrx8

iTrader: (46)

Hmmm.

Brettus

iTrader: (2)

Mine has been set up this way for years and I've never had issues with timing . that being said - I doubt my IATs have ever been that high either ......
I did do some experiments ages ago - putting false numbers in the chart so that the ecu thought temps were that high . Never noticed timing being pulled.

ShellDude

iTrader: (12)

Have been considering plumbing a manifold temp sensor into my Select's aux temp input for a while.

Just haven't gotten around to it.

Flashwing

The only two reasons that I do not suspect the knock sensor as the source is because the car was on the dyno at the time and the results were repeatable every time. I would expect to hear knock that resulted in the pulling of as much as 5 or 6 degrees of advance but I never heard any sounds of knock during the 30+ pulls that were made with the car over the course of several hours.

I've experienced the phantom knock sensor ignition pull on my own vehicle with rich misfires so I know that even if it pulled timing I have no way to detect it via the logs thanks to some fantastic reading here on 8club.

The repeatable nature of the timing pull was the other aspect as well as the timing table being highly aggressive to get the results we were looking for. The dyno plot showed no signs of any power fall off or disruptions in the curve which is what I would expect to see with detonation. Granted, I've not seen what detonation looks like on a dyno plot so I'm speaking from inexperience there.

Had the car followed the plots on the timing table, it would surely have nuked the motor. I ended up stopping the advance while on the dyno because I was concerned the motor would not survive if the PCM reverted to interpreting the table literally. In the end, I compromised with the advance and have heard no issues since then.

I honestly don't have an explanation for it. I've not seen this situation on my own RX8 although with a turbo setup I don't see high IAT's and I've not reviewed my own timing table in a while to see if there is anything pulled as a result of the higher temperatures we are seeing here in Arizona.

It makes sense to me to plumb your IAT sensor into a location where it sees the actual IAT values. Mazdamaniac mentioned to me that it caused some problems but I imagine that it simply made fuel targets a little more unpredictable due to calculated load adjusting under certain conditions more so than it would with a rather static IAT value you get from reading in the front of the intake system.

Accuracy vs. simplicity I suppose is probably the battle here. I may try this setup myself as I think I could deal with the fuss of shifting fuel targets since the PCM's more powerful aspects are being able to adjust for changes in mother nature.

Slick8

GM IAT P/N 25036751 and pigtail from,
GM Open Element IAT Sensor with Pigtail DIYAutoTune.com

https://www.rx8club.com/attachment.p...1&d=1399090472

ShellDude

iTrader: (12)

win!

Harlan

iTrader: (3)

Just installed and calibrated the GM IAT. Use the red/white and green/black wires on the end they are the only ones used for the stock IAT and the only ones you need for a GM IAT. You then need the right sensor curve for ATR/ME. Here it is, I calibrated it at different known temperatures while connected to the car, then interpolated the stuff in the middle. Should be pretty accurate until you get below 32deg or over 200.

I currently have a Nissan E60 Maf installed as well. I'll post the cal data on that once I have it tuned in a little firmer. Right now sitting at <5 STFT at idle, but haven't worked it through the load range yet. I can already tell it flows quite a bit more top end.

MAF may be a bust. Started working the numbers out for higher flow and it appears to flow less than stock. But I did get the car to run well on a non standard maf!

yomomspimp06

thanks harlan

JimmyBlack

AEM spec sheet and Harlan's calibration tables above gave me incorrect IAT readings on my car for whatever reason. I dialled in the sensor calibration to within 1 degree across the 15-65C temp range, and estimated 2-3 degrees outside that range using the tables below.

Thanks for wiring details Brett, Harlan. Wiring install was very straight forward.

Brettus

iTrader: (2)

nice work James ..... tempted to ditch the sensor I have ...problem being the big hole I had to cut to fit it .

Should link this thread here in case anyone wants to know the potential affects of IAT:

https://www.rx8club.com/series-i-eng...t-tune-259903/