Can you put regular or midgrade into your car???...
10-13-2008, 06:10 AM
#21
AudiWorld Super User
I thought the 'ol 3.2 and 2.0T had variable valve timing, just not variable valve lift.
From 2008 A6 3.2 German data chart...
"with FSI - Fuel direct injection, variable intake manifold, <b>variable camshaft timing</b>, and chain driven camshafts"
It's also in the A6 tech specs for the 3.2.
"continuous camshaft adjustment for the intake and exhaust valves"
Unless the old A4 3.2 is somehow different from the A6? That would be odd given their identical power specs, however it is odd that the line is omitted from the A4 3.2 specs in the model guides. 2.0T specs mentions "Intake camshaft adjustment".
"with FSI - Fuel direct injection, variable intake manifold, <b>variable camshaft timing</b>, and chain driven camshafts"
It's also in the A6 tech specs for the 3.2.
"continuous camshaft adjustment for the intake and exhaust valves"
Unless the old A4 3.2 is somehow different from the A6? That would be odd given their identical power specs, however it is odd that the line is omitted from the A4 3.2 specs in the model guides. 2.0T specs mentions "Intake camshaft adjustment".
10-13-2008, 07:30 AM
#22
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exactly
you'd save .05 per gallon at 16 gallons, so you save 80 cents per fill up. you fill up 4 times a month, you save 3.2 a month, and that would be less than 40 bucks a year. just buy the premium
10-13-2008, 10:54 AM
#23
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Arg....
<a href="https://forums.audiworld.com/a4b7/msgs/104877.phtml">From my previous posts on this issues:</a>
Higher octane fuel does not provide more power, and does not in anyway correlate to the energy content in the fuel. It does however provide a higher resistance to detonation (also known as autoignition), which means that more boost/timing (and higher compression) can be used to increase power without comprising the safety factor and risking engine damage.
Audis (and most modern cars) have a knock sensor, which detects detonation (caused by low octane and deteriorated high octane fuels) and will lower the boost/timing to protect the engine.
All that said, would I ever run lower than 91 Octane on my Audi? HELL NO. That's an awfully big risk to take. The stock compression ratio on the 2.0T is 10.5:1, which is VERY high especially for a turboed car. Even a naturally aspirated engine at that CR would likely require premium fuel for maximum saftey factor.
Bottom line: If you think risking a $10,000+ engine to save 10 bucks over a year is worth it- go for it. I should also warn... your gas milage will drop, as well as your power as a result of the knock sensor with lower grade fuel- it might not even work out to 10 bucks a year.
Higher octane fuel does not provide more power, and does not in anyway correlate to the energy content in the fuel. It does however provide a higher resistance to detonation (also known as autoignition), which means that more boost/timing (and higher compression) can be used to increase power without comprising the safety factor and risking engine damage.
Audis (and most modern cars) have a knock sensor, which detects detonation (caused by low octane and deteriorated high octane fuels) and will lower the boost/timing to protect the engine.
All that said, would I ever run lower than 91 Octane on my Audi? HELL NO. That's an awfully big risk to take. The stock compression ratio on the 2.0T is 10.5:1, which is VERY high especially for a turboed car. Even a naturally aspirated engine at that CR would likely require premium fuel for maximum saftey factor.
Bottom line: If you think risking a $10,000+ engine to save 10 bucks over a year is worth it- go for it. I should also warn... your gas milage will drop, as well as your power as a result of the knock sensor with lower grade fuel- it might not even work out to 10 bucks a year.
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