85mm MAF rewiring to USE IAT
Thread Starter
Joined: Apr 2005
Posts: 4,085
Likes: 1
From: N. Falmouth MA
85mm MAF rewiring to USE IAT I haven't heard of anyone doing this, but I noticed the 85mm MAF has an IAT built in. I can get some pins off my uncle and rewire my harness up front to use the IAT in the MAF and eliminate me having a separate sensor.
Here's what I found.. I still have to find the schematics for the Camaro, but I found the ones for the Vette.
Purple and Tan wires are for the IAT (Vette)
5pin MAF
Here's what I found.. I still have to find the schematics for the Camaro, but I found the ones for the Vette.
Purple and Tan wires are for the IAT (Vette)
5pin MAF
Thread Starter
Joined: Apr 2005
Posts: 4,085
Likes: 1
From: N. Falmouth MA
I stand corrected.... I did find THIS.. Only one thread that turned up. (Google search for Tech threads is actually a LOT easier and painless)
https://ls1tech.com/forums/generatio...onversion.html
https://ls1tech.com/forums/generatio...onversion.html
Got some pins and a crimper from my uncle. 
I used the in-MAF IAT with a Casper's adaptor for a
while, only downside was a wireball on top of the motor.
It was better than the in-lid IAT which heat-soaked
really bad and had negligible airflow (located in back
corner).
Eventually I pulled the IAT wire pair out of the loom
along with the MAF trio and soldered them all up to
a 5-wire MAF plug (Casper's again).
But now I have IAT coming from a thermistor up in
the cowl ventilation and wired into the harness near
the PCM. That is much better for hot starting and
such, it reads ambient air and not engine bay air
(which, if your cold air setup does its job, is more
realistic).
while, only downside was a wireball on top of the motor.
It was better than the in-lid IAT which heat-soaked
really bad and had negligible airflow (located in back
corner).
Eventually I pulled the IAT wire pair out of the loom
along with the MAF trio and soldered them all up to
a 5-wire MAF plug (Casper's again).
But now I have IAT coming from a thermistor up in
the cowl ventilation and wired into the harness near
the PCM. That is much better for hot starting and
such, it reads ambient air and not engine bay air
(which, if your cold air setup does its job, is more
realistic).
Thread Starter
Joined: Apr 2005
Posts: 4,085
Likes: 1
From: N. Falmouth MA
^ Ahhh.. THe metal is worse of a heat-soak, but the lid IAT isn't really in a steady stream of air.
Good idea wiring one up by the cowl.. I may do that eventually. A tuner on the local board told me not to use the IAT in the MAF, but I wasn't sure why.
Good idea wiring one up by the cowl.. I may do that eventually. A tuner on the local board told me not to use the IAT in the MAF, but I wasn't sure why.
