Intake sensor relocation

[Billy Mild]

http://www.zr1specialist.com/HAT%20Web/products/air%20sensor.htm

Has anyone done this mod themselves? Did it make a difference?

[LGAFF]

it very easy, not sure you will notice seat of the pants improvement, but every little bit helps. I put mine down in the well by the secondary vac pump reading outside air

[We Gone]

Moved mine to the plastic filter housing

http://imagizer.imageshack.us/v2/800x600q90/911/ze2evx.jpg

[XfireZ51]

http://www.zr1specialist.com/HAT%20Web/products/air%20sensor.htm

Has anyone done this mod themselves? Did it make a difference?

I have mine in the same location as We Gone. However, the purpose of this mod is to avoid the MAT being heat soaked and providing a false signal to the ECM.
Locating the MAT further upstream of the intake air charge provides a more consistent Intake Air Temperature signal BUT you cannot take advantage of it unless the calibration is modified to reflect that change. The stock calibration is expecting a nominal temperature of ~ 80C. At that those temps, the ECM uses intake air and coolant temps in equal parts to modify fueling. Relocation of the sensor effectively eliminates sensor readings of anything above 40C or 130F. At this temp, the ECM is using the Intake Temp over the coolant temp to regulate or modify the fueling.
The result is that the motor will run richer than it should be. The purpose of the MAT/IAT is to help ECM regulate fueling so that it is consistent over a wide spectrum of intake air/coolant conditions. IMO, not worth doing unless the calibration is modified to accommodate the relocation.

[WARP TEN]

Moved mine to the plastic filter housing

http://imagizer.imageshack.us/v2/800x600q90/911/ze2evx.jpg

I did this early on with the '93 (back in '95) and on the '95 Marc located it down in the grille opening. Can't say that one item makes a noticeable difference but it is logical that a more consistent and accurate ambient temp reading will feed better data to the engine computer. One of the little things that add up to a better running Z. --Bob

[Paul Workman]

And, what if the TB coolant is bypassed. The temp of the air horn is very close to ambient air temperature; within a few seconds of run time. I wonder about the impact (if any) that has? Hummmm....

[LGAFF]

this might be on a C5 test vehicle

http://teamzr1.com/dyno1.html

[Billy Mild]

Is this saying a possible 10 HP gain from moving it?

[LGAFF]

Not sure if its a gain, or just not losing it to heat soak....so its not pulling timing. It takes 30 minutes to do and less than $20....can't hurt

[Billy Mild]

Not sure if its a gain, or just not losing it to heat soak....so its not pulling timing. It takes 30 minutes to do and less than $20....can't hurt

Does anyone have the stock location of the sensor? I may just do this over the winter along with a few other mods.

[We Gone]

Does anyone have the stock location of the sensor? I may just do this over the winter along with a few other mods.

Not sure if this is what your asking, here is my 93 with the stock sensor still in place. It had been relocated the same as my 91 but I did not have a plug yet to put in its place.

http://imagizer.imageshack.us/v2/800x600q90/908/Z9nTOS.jpg

[XfireZ51]

Relocating the MAT to the intake re-purposes it as an IAT. I've attached a screenshot of the SA MAT Retard table. It pulls up to 3* timing beginning at 180F intake air temp and 1* starting at about 150F.
You will only likely see that level of IAT sitting at idle. Once the car moves the intake air charge has less time to heat up. At WOT, the "transport" time for the air would be minimal and intake air temp would be closer to ambient. On a dyno, the intake air could heat up further since the car is not moving and ambient temps could be higher.

[9T1 Red ZR1]

We Gone,
Where did you get the extension cable for the sensor? If you made it, do you have a list of the parts and sources for them?

Thanks,
Bill

[XfireZ51]

We Gone,
Where did you get the extension cable for the sensor? If you made it, do you have a list of the parts and sources for them?

Thanks,
Bill

http://www.mamotorworks.com/Corvette/product/zr1-lt1-mat-sensor-relocating-kit-609051-1

[9T1 Red ZR1]

Thanks!

Bill

:handshak: