Hi to All, Trying to wrap up my lt1 intake conversion i need some tec.advice,The car is an 85, do I need the Mat sensor?I will not be running an EGR. ,Also is the ECS and the MAT the same sensor?they look the same in pics.If anyone can tell me what sensors I need it would be a big help, Thanks

 

You're car is MAF, not speed density, so you need the MAT sensor to run properly. Like I mentioned yesterday, you can purchase a relocation kit amd place it ahead of the MAF, like the LT-1 cars have it. You get a new sensor with the kit. You'll need the coolant temp sensor, knock sensor, all your oil pressure/sending unit sensors. I don't have my helms here at work to list anymore, that's off the top of my head.

 

I have read on a few other post,that it only controls the egr valve on the 85, which I have eliminated,so do i still need the MAT sensor??

 

Can you post the link to the post that says that? Always willing to learn something new.

Jake

 

mr nice the mat sensor aids the computer in determining timing and some other b.s. i'm running mine on my conversion.. that i just finished, i would post some pics but crap, i'm way too dumb to figure out how to do it

 

Thanks for the help ,I'll look today and try to post a link to the post that sez you don't need one,not wanting to argue or anything just want to make sure before I waste money on something I may not need.Thanks again.Still taking advise

 

 

Thanks, hope you find it.

I was under the impression that the MAT sensor is needed for the ECM/PCM to properly calculate ignition timing and injector pulse width. Could be that the 85 is different though.

Let us know what you come up with.

Jake

 

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Where to mount the MAT SENSOR??
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10-28-2005, 08:32 AM #1
chillcat
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Location: crystalriver "85 Vette" Florida Where to mount the MAT SENSOR??

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I wanted to mount the mat sensor a differ location other than under the plenum near the distributor on my 85. I didn't want to buy a kit for $50 from midamerica, so I'll just buy another sensor and run a jumper wire to the air box--but I don't know of a perfect place to drill the hole in air box for a permanent install. This is to get a cooler air reading for the computer-and mounting it back under the superram is OUT OF THE QUESTION.

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10-28-2005, 09:00 AM #2
rodj
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I relocated mine to the top rear of the air box (horizontal )just before the part where it tapers ups to the MAF mount and extended the wires.

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10-28-2005, 09:16 AM #3
Nathan Plemons
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Curious why you would want to relocate the MAT sensor to give a cooler reading to the computer when the air is actually at a higher temp by the time it reaches your cylinder.

It would be better to reprogram the computer to compensate for your mods rather than to try and trick the computer.

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10-28-2005, 10:08 AM #4
chillcat
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well I did say I cannot reattach the mat sensor plug to the underside of superram--I tried working on that a couple hours yesterday and finally threw up my hands and said no more. Unless I remove the actual plenum-I cannot slip the wire over the sensor-I don't have angle pliers either to do that job with. So it would be easier to just relocate this thing and leave the old sensor in its current place to prevent vacuum leakage. This isn't for power gain purposes.

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10-28-2005, 12:25 PM #5
65Z01
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Get a rubber groumet, some length of wire & black spiral-wrap then cut off the connector under the plenum, solder the new wire to the old, run the new wire inside spiral-wrap over under the brake booster to the LH fender well, along the felder well and over to the side of the air box. Then splice the old MAT connector into the two new wires, drill a hole in the side of the air filter lid, install the groumet and slide the old MAT through the groumet.

You can get a brass plug to fill the MAT hole under the plenum. Just unscrew the MAT and take it to Lowe's to match up the thread.

BTW, the location of the MAT under the hot plenum gives an erroneous intake air temp. reading.

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10-28-2005, 01:48 PM #6
chillcat
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cool...thanks, this will help me out...I
appreciate your help

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10-28-2005, 02:38 PM #7
Morley
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The MAT sensor only plays a role in fueling on speed density systems. On the MAF systems its main function is for EGR operation.

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Corvette Forum > C4 Corvettes, 1984 - 1996 > C4 Tech/Performance
Where to mount the MAT SENSOR??




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i have no clue how to post a link?? Read statement above from Morley.

 

http://forums.corvetteforum.com/show....php?t=1618391

I posted what i did with the MAT. I change it to a LT1 IAT. And did the necessary changes in the .bin.

Cheers

 

What did you change in the bin? I was thinking of switching to a TBI IAT since my MAT is currently in my air cleaner.

-- Joe

 

Nothing in my helms (85 vette) says anything about the MAT relating to EGR function. On our MAF cars, the MAT is used for A/f ratio during open loop - warm up & WOT.

 

MAT is used for a lot of baseline calculations if I recall, spark retard, and a few other things.
I'm more familiar with the 86+ MAF setups though, 85 could be different.

Helms manuals are for mechanics. I imagine if you had a GM EFI engineering manual it might go into a bit more detail of the EFI operation.


-- Joe

 

So should I relocate the stock MAT sensor ,or convert to Lt1 IAT ??? or eliminate all together I'm starting to wish I went CARB At least it would be together by now

 

Man, don't eliminate it, you need it. Switch to the LT1 version if you have to, but you won't run well without it.

http://www.buy.com/prod/corvette-fue.../30739927.html

anesthes, I have the above book, and I will check on EGR function and its relation to the sensors involved.

 

Be sure NOT to mount it on the top of the air filter housing or the hood will hit it when closed.

I mounted the one on my 86 on the drivers side of the filter housing when I installed the MiniRam.

BTW, what's up with all that additional Forum information that is attached to the previous posts? How'd that happen?

Jake

 

That extra info is cause i know squat about posting a link

 

Cause he copied the whole page , not the link from the address bar

 

GOTTCHA!

Jake