PON RON and MON
03-22-2006, 01:56 PM
#1
Pro
Thread Starter
PON RON and MON
I had an argument I hope I can settle. I can't find my manual so I can''t settle it on my own. The stock 964 911 C2 engine was designed for minimum 91 RON. Since the US market uses the AKI/PON system, that would equate to 88PON or pump octane. Which means the car can run 89 PON if necessary. I think all DME cars in the US can run on 89 PON if necessary.
Am I wrong?
Am I wrong?
03-22-2006, 03:56 PM
#3
03-22-2006, 05:07 PM
#4
Instructor
Join Date: Oct 2003
Location: Central Wisconsin, USA
Posts: 208
Likes: 0
Received 0 Likes
on
0 Posts
My manual says minimum octane rating is 95 ROM and goes on to explain that 95 RON is equal to 90 CLC or AKI (which goes on to show it is the same as pump octane). A sticker inside my fuel fill cover says use minimum 91 (R+M)/2 which again is the same as pump octane where I live. I use at least 91 always.
03-22-2006, 07:45 PM
#6
Addict
Rennlist Member
Rennlist Member
Mine activates the knock sensor retard even on 93 octane (R+M)/2. I have not tried 89 octane, but it surely would reduce the performance because of being retarded all the time.
03-22-2006, 07:55 PM
#7
Racer
Join Date: Dec 2004
Location: Suburbia
Posts: 441
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by springer3
Mine activates the knock sensor retard even on 93 octane (R+M)/2. I have not tried 89 octane, but it surely would reduce the performance because of being retarded all the time.
What is this retard and how do you know when it is activated?
Trending Topics
03-23-2006, 12:11 AM
#8
Originally Posted by springer3
Mine activates the knock sensor retard even on 93 octane (R+M)/2.
Does that mean you're engine knocks all the time?
That doesn't sound good.
03-23-2006, 08:54 AM
#9
Three Wheelin'
Join Date: Oct 2002
Location: Pasadena, MD - Land of Taxes
Posts: 1,879
Likes: 0
Received 3 Likes
on
3 Posts
I always fill up with 93 octane and throw a can of octane booster in. (I don't want to start a debate on the value of adding octane booster.) I have never had pinging of any kind. I have heard of higher octane available in some places like Sunoco stations across from a race track. They can go up to 96 octane.
You could always go with a mix of avgas and regular gas. At 100LL it will burn hot though. I used to work at an airport as a kid and used to mix it in with regular gas in the Olds I built. Cleans the fuel system too!
You could always go with a mix of avgas and regular gas. At 100LL it will burn hot though. I used to work at an airport as a kid and used to mix it in with regular gas in the Olds I built. Cleans the fuel system too!
03-23-2006, 03:38 PM
#11
Pro
Thread Starter
Originally Posted by springer3
Mine activates the knock sensor retard even on 93 octane (R+M)/2. I have not tried 89 octane, but it surely would reduce the performance because of being retarded all the time.
That does sound bad though. Have you taken it in for a check?
As for the fuel cover sticker, mine says 91 RON. It was actually this that sparked the discussion I had with my buddy, who dared me to use 89 at the next fill. My car is a euro-delivery so maybe PNA forgot to switch stickers when they brought the car to US spec. I know there were some minute differences to the car when I picked it up at Zuff vs when I got it at the dealer after it came from Zuff. Ah those were the days when euro-delivery made it CHEAPER to buy a porsche. Now you have to pay to get it euro-delivery.
