turbo buicks
ESADAH!!!
- Joined
- Jun 13, 2002
- Messages
- 2,936
can i just tap out a hole in the up pipe and put the MAT sensor in there or would the boost pressure tear up the MAT sensor and suck it in my engine?
MAT sensor in up pipe
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turbo buicks
ESADAH!!!
- Joined
- Jun 13, 2002
- Messages
- 2,936
i was just thinking it might ive the computer a more accurate reading of the actaul air temp in the engine
It would be nice if the MAT sensor actually gave some useful information other than outside air temperature wouldn't it? 
Unfortunately, if you do a search you will find that if you try to relocate it on the other side of the turbo your chances for success are slim. The reading varies widely depending on where it is placed. Some have even found different locations within the plenum to yield quite different readings.
I wanted to relocate the sensor myself since provides such useful information on the SyTys, really letting you see the efficiency of your IC. But after reading up on the topic I just let it slide. Maybe someone else has more encouraging results. I'd love a good excuse to do it.
Unfortunately, if you do a search you will find that if you try to relocate it on the other side of the turbo your chances for success are slim. The reading varies widely depending on where it is placed. Some have even found different locations within the plenum to yield quite different readings. I wanted to relocate the sensor myself since provides such useful information on the SyTys, really letting you see the efficiency of your IC. But after reading up on the topic I just let it slide. Maybe someone else has more encouraging results. I'd love a good excuse to do it.
I have mine mounted in the upper plenum.
I also use the MAT timing correction table.
Ambient air temp is almost meaningless, for the greatest accuracy in figuring out what the engine is injesting, you want to measure the air as close to the intake valve as possible. Actually monitoring the chamber just before ignition would probably be best.
I also use the MAT timing correction table.
Ambient air temp is almost meaningless, for the greatest accuracy in figuring out what the engine is injesting, you want to measure the air as close to the intake valve as possible. Actually monitoring the chamber just before ignition would probably be best.
Bruce is right. This is also where the sensor is/should be located on FAST equiped cars. I did log a couple of runs and with MAT starting out in the 120's by the end of the run I was at 158 F at 30 PSI and the ambient temp was around 78F. Pretty cool being able to see what's actually going into the engine.
My sensor is mounted on the passenger back side of the plenum. You will just need to drill and tap the sensor and mount it. You will need to get a MAT wire extension too. I think Caspers sells them.
Ted
It's mounted on the pass. side of the upper plenum.
About an 1.5 inch back form the Throttle body flange.
About an inch down from the ribbing.
The table and offset locations are all in the Prom Excel sheet at GNTtype. You just need to see what temps your actually running and then compare them with the table locations, and take some timing out at the higher LV8s as needed.
10.3s, a serious hotrod, eh?.
In running my ALOT, and watching the MAT on Scanmaster, it's been interesting to see what's really going on, at other then WOT.
ie how fast the MAT goes up from a cold engine and how steady it is reguardless of ambient air, at low loads.
And with the way the table is laid out the guys really had their ducks in a row.
Odd thing is that they use the table in the N/A 148 ecm'd cars and not the turbos.
Thanks for the info guys. Yet another Winter project. For reference down the road when I come back to this, can someone explain quickly when our ECMs use the MAT temp? Just a basic explanation...I'll research it more later. Thanks again. 
