Let me simplify the question.
Has anyone corrected the rich AA condition by simply turning the setting on the DME to a different number?

17MPG (highway? you don't say) is horrible, sounds like something more than just the chip running a little rich.

You could try the switch, but from my notes position 7 (or 8, depending on where you start counting) also pulls out ignition advance. I've always held the DME FQS (Fuel Quality Switch) settings for our 911's are as follows:

Switch Fuel Ignition
1 0 0 stock setting
2 +3% 0
3 +6% 0
4 -3% 0
5 0 -3deg
6 +3% -3deg
7 +6% -3deg
8 -3% -3deg

If I wasn't programming my own chips I'd spend for a custom chip - From what I've heard about Steve, you can tell him your header/muffler combo and he can come pretty close with the fuel/ignition settings without any dyno runs.

Chuck.H
'89 TurboLookTarga, 369k miles

A 3.2 with 229 at the wheels with only headers and an M&K muffler, that's a topic of discussion right there!

I found a Autothority chip installed in my 85 3.2 as well. My car runs great and got 24 mpg on a long road trip. It has also passed it's last 7 Southern Cal smog checks. I remember the Autothority chip was all the rage for Porsche cars 25-30 years ago. They were in all the mags like Road&Track and everyone installed one in their 944. I'll just let it stay.

Same thing happened to me, as to "discovery.

I (ultimately, in to ownership) made discovery of an Autothority chip resting within my DME. I installed a Wong chip (customized, as Steve will certainly do JUST THAT for you), removing the previous chip.

The AU chip had been in for a couple or so years and the Wong install made dramatic differences. No chances to quanity on a dino, but it was there, no doubt.

I've wanted to get with a friend to read out this AU chip to see what they were doing vs. Steve's setup. Later, I found a few threads on it.

What's so (NOT) funny is that I made the discover while gassing up the girl one night. I happened to look down at the inside of the gas lid and noticed the stiker (93 octane minimum,...and why). The very next morning, I had Steve's chip on it's way. Couldn't believe it.

BEST!

Doyle

Heck, in a few years the Wong will be gone because it will not be cool anymore. We will be buying a new super chip from Samsung that is voice activated. ( S Voice?). You will hit some crazy mountain roads and command..... "Activate mountain road program".

Thanks Chuck,
Yeah, setting #4 is the one I was asking about if anyone has used to compensate for the Autothority rich running issue. Also the 17 mpg is mix if mostly city/suburban and some hiway.
I suspect the person getting 24 hiway with the Autothority chip has the setting 4 on the ECU.
I am tempted to try setting 4 for a 1/4 tank of light hiway cruising, if it goes to 24-25 its prob ok, any more mpg than that and its prob too lean. OR the old fashion way.....a quick short blast at hi speed and read a couple of sparkplugs.

Steve just made some improvements to his 911 chip and some users are reporting markedly increased fuel economy.

Chipping a 911 really is not like it used to be when it was one of the fastest cars in town. Now there are so many regular cars that are so much faster really why bother? An 84-89 911 is much fun to drive anyway just the way it is. Have you never had a Subaru WRX or 400H.P+ Mustang or Dodge Charger or Challenger pass you like you were standing still? Dang, they are fast!

You've missed some of my posts, that was four years ago.... it's now 324RWHP with a Vortech supercharger pushing 7psi of boost. :D

HAHA! Rub it in why don't you!

Couldn't say it any better.. SW is very helpful and I too am a very satisfied customer!!