C24FUN

I recently installed an Autothority MAF in my '90 C2 (bought used, no documentation). I have also built and used the DME Scantool. The combination of these activities has revealed that I have an Intake Air Temp fault (Code 25). I believe the temp sender for the Intake Air measurement is in the stock air volume flapper assembly. So here's the question:

Does anyone know if the Autothority MAF incorporates a similar temp measurement sensor? I assume it should and perhaps I have a bad connection or a faulty sensor, but if anyone has confirmation (or a copy of the Autothority documentation) I would appreciate the info.

Thanks in advance,

Jim G.

LouZ

I also have the Autothority MAF + I installed their chip. I do not get a Code 25 when I use the Scantool.

Sorry, but I don't have any documentation when I got the MAF (used). I would also like to get a copy if one is available.

tbennett017

I have the Autothority setup.. and I don't have any documentation.... it seems to be working well, but I do have some problems with the car running lean. I am looking forward to using a loaner scantool this week or so, so I will keep you posted if I get the same error. I am very interested in this topic, as I am tempted to go back to a stock unit with a Steve Wong chip instead...

Thoughts?

C24FUN

I took apart the wiring harness adaptor for the MAF and discovered that Autothority had simply installed a 2.2k Ohm resistor in the harness to fool the DME into thinking that the temp is a constant 75 degrees F.

Unfortunately in my adaptor the resistor wire had broken so the DME was seeing an open circuit (-26 deg. F). The DME eventually figures out that this is wrong, registers an Air Temp Fault (code 25) and substitutes 68 degrees as a fixed value.

I repaired the wiring and everything is as good as new. I have attached a wiring diagram of the MAF harness adaptor for anyone interested.

Ciao!

Jim G.

brutus143

Whats the benefiet of this MAF in hp, etc...

deep_uv

C24FUN

The Autothority MAF kit is advertised as providing a gain of 30 HP on the 964 3.6 engine (see their info at http://www.autothority.com/products/Mass-Flow-Kits.html ).

While I don't currently have the information to support their claim, I can definitely say there is an increase in power. I hope to be able to provide more explicit data after I have another dyno session: I have the "before" data so in the next couple of weeks I hope to get the "after" data. This will show horsepower gains for only the MAF change, measured with the same car on the same dyno under similar ambient conditions.

I will post the results when I have them.

Jim G.