ImQuattro®

injector's cleaned. Head's were also gasket matched when the intake was off for the P&P.
New gaskets, no intake leaks.
Pinging goes away in all other throttle positions, but the 1/2way point is the most common position for driving.
Car runs great otherwise. Plenty of power.
FWIW, my wife's 93 100 also pings a lot.
We use 89 octane.
Oh, new air filters in both.
Are these cars prone to this?

EDIGREG

You'll get better performance AND mileage with 93 octane, which is what's recommended for these cars.

Are your RF9s gapped properly? I've had better success with the OEM NGKs.

Doesn't seem to be a common problem at all...

ImQuattro®

It is NOT necessary to run high octane (93-94) in the run-of-the mill A6 2.8 12v's IIRC...
I will try it the next tank but jeez, it's just a boring 12v... not my hopped up UrS4

VAP

compression ratio and your wifes is 10.3:1 CR. Yours is identical to a Corvette LS1 CR and your wifes has higher CR than the same car. If you'd use mid-grade fuel in the corvette than I suppose those "lowly" 12V's should be fine following the same logic.

ImQuattro®

Sell.
Anyone want an A6Q 5spd w/ an UrS4's front end & black sport leather interior?

VAP

350 cu in = 5.737 litres. That means that corvette is making 53.16 HP per litre.

The "lowly" 12V at 2.8 litres and 172HP is putting out 61.43 HP per litre. That's almost 20% more power per litre!

Still think mid range fuel is sufficient?

ImQuattro®

Nice food for thought! Sure wish it pulled like a corvette!

VAP

don't we all!?! If you're not already doing so try giving your gas money to a name brand, different or major oil company gas station. Try Shell or Sunoco or the "big" names near you known for good fuel. You may be fine with mid-range octanes and just getting it broke off in you at the station you currently trade with. Others do the mid-range thing without incident. You "may" just be getting bad/cheap or watered/down gas. In "this" economy anythings possible and anyone is capable of anything and therefore EVERYONE is suspect! Spread your fuel money around a bit, see what happens. Or try half-n-half blends by using x-percentage mid-range and top off with premium. Hell, there's many ways to skin this cat short of selling out.

20VT90q

It's like $5 more a fillup for the good stuff.

You get more performance and the gas burns cleaner reducing maintenance.

Why would this prompt you to want to sell it?

EDIGREG

Given that you said both 12v cars are pinging, and both run 89 octane...I'd say that's the culprit.