Since TPI incoming air temp sensors are all metal they adsorb heat from the intake plenum, thus providing a less accurate temperature reading.

The stock sensor looks like this:


My idea would be to use a sensor like this:


This sensor has plastic around the temperature sensor. It is the same size, same plug, same temperature range, same length and same resistance values.

I know you would have to recalibrate some stuff in the ECM. That is not a problem for me. But wouldn't this provide a more accurate means of measuring the incoming air temperature and thus causing more accurate air/fuel ratios?

[EDIT]
Updated pictures to working links

 

Here is a close up:

 

I was about to say "IAC/MAT does nothing on a MAF car", when I noticed you converted to SD.

On my car, I use the LT1 type MAT (relocated in the rubber connector just in front of the Throttle Body). The LT1 type is much faster reacting than the stock L98 type and it is plastic if IIRC.

And yes, you will have to recalibrate the MAT Inverse Delta Look up table. Do some searches, I even posted a correction table for a relocated LT1 type...though you may have to tweak your VE tables/Injector constant a bit. But that MAT table is very accurate from 0*F to over 110*F for incoming temps.

 

So you would recommend putting in front of the Throttle Body instead of in the plenum? How did you mount it the rubber hose so it would be air tight? Did you just cut small hole and push it in?

 

Also wouldn't the sensor I have pictured above give the same results as a lt1 sensor?


For anyone wondering how a LT1 MAT looks like on a lt1 car here is a pic:

 

anyone?

 

Looks great! What's the part number for cross-reference? Get it at your local Autozone & what-not?

 

I picked up an air intake assembly off an 86 Firebird that had a V6, it had that style sensor (with the open cage) on it. Looked factory. I think the LT1's also use it.

 

This took a few hours of internet searching to find all the info but here it is:

This site confirms the resistance values are the same:
http://www.geocities.com/MotorCity/G...o_osg/MAT.html

Car that I found that this sensor comes off of: 1985-88 FIERO v6 or a 1985-92 Camaro, firebird V6
Gm part #: 25036751

Napa part #: ECHTS5100
Napa's link: http://www.napaonline.com/cgi-bin/nc...grpid=28624785

http://www.gmpartsdirect.com has it for $17.44

 

I searched for this post and came up with nothing. Can you send me a link to the post; I am sure the table you have made for the lt1 sensor will work good for this sensor.

 

You didn'y do a very good search. Try this thread and it has links to other threads.

https://www.thirdgen.org/techbb2/sho...=mat+relocated

 

Does anyone have any ideas if these tables would work good if I used the sensor posted in the first post and put it in the sensors original position, in the plenum?

Glenn91L98GTA,
You made this table right? What do you think?

 

anyone have any idea?

 

I swapped out that sensor for my factory one a year ago and temps are much more accurate. After datalogging with the original sensor and the caged one you'll notice your IAT reading actually moves much quicker.

 

Are you using Glenn91L98GTA's MAT Inverse Delta Look table?

 

No I'm using a 749 ecm with $58 code.

 

Man,This is a cool thread.I have used my 87 v6 mat for a long time.It is way better,works great.It's like a plastic basket instead of that hunk of metal.Just go to autozone ask for an 87 camaro v6 mat.You'll need to snake a clip for the sensor,it is different than the tpi.

 

Guess you've never seen the LT1 MAT sensor (which is the recommended sensor)...definitely NOT metal. And it's dirt cheap too.

 

theres some things so consider. abouyt the IAT for the MAF cars. you can enable a timing retard that way. its a good way to help keep detonation away. and the IAT is used in some of the PW corrections. on the 165.

 

Show me the code. Other than some minor indirect effect caused by the engagement of the EGR, there is NO direct effect on the fueling calcuation based on the MAT setting.

I can show you ALL OVER how it works on $8D/SD code but not on the $6E. So I am callling you on this one.

Show me the code that the MAT has a direct effect of the calculation of the fueling. (Engaging the EGR does not count, I can engage the EGR via the VSS instead of the MAT and it results in the same fueling once the EGR is engaged).

Sorry Sean but you must prove it.

 

042B: Startup enrich vs MAT
...and a few IAC things, but I think you're pretty much right that it's pretty innocuous...

 

Thanks Craig. For collaborating the limited use of the MAT sensor for MAF cars.

People keep forgetting that a MAF car doesn't NEED to know the air temp (or air pressure change caused by elevation either)....the MAF Sensor detects this when it measures the air flow.... colder air, more cooling of the wire, more air flow reported to the ECM by the MAF (in simplistic terms).

 

Yea but on the above sensor the medal doesn't touch the resistor (sensor) so it does not effect the temperature measurement. The base is just metal and the sensor part is plastic so it does not bias the temperature reading. Also the above sensor would give a more accurate measurement of air temperature entering the engine because you could place it in the factory position in the plenum.

I wonder if your table would need to be modified when putting this sensor in the factory position.

 

I wonder if the MAT table should be modified even with the stock MAT sensor in the stock position? I no longer have the stock intake (went Miniram), so I MUST use a relocated MAT now. But it would be an interesting to see if the MAT Table could use "tweaking" as is.

But I did find that I got very consistent BLM/INT values once I modified that MAT Inverse yada yada yada table. Sure wish I had a "real time" Romulator when I came up with my correction values.