Tampa 928s

What about an 85 euro, I can't hear pinging with the X-pipe and exhaust. I would like to drop a grade or two running 93 now.

GRTWHT

Running 98 all the time in my car.

BP 98RON is the best - no pinging isues.
Caltext 95RON - no good gets pinging
Shell 98RON - no good gets pinging

Anything less just pings under hard accelerating.

Not sure if you guys have those brand fuels, but thats my story here in Australia.

Glenn
'81 928 (M28.10 Auto)
AU

6mil928

I wish we had those

GlenL

My Euro has decked heads and 98mm '85 Euro pistons so I figure about 11.5:1 compression. A bit of extra advance, too.

When I'm thinking, or going to the track, I'll run a 5:1 mixture of 92 octane and 110 octane. That gives roughly 95 octane in the tank.

Why don't polls ever include my choice?

GRTWHT

Because you're one of these High Performance guys, you're not normall

We used to be able to buy 110 Octane fuel from our local pumps, now you need to be registered with a car club to buy it, for off road use only.

Glenn
'81 928
AU

tveltman

I would say that if your car has knock sensors, you can use 87 no matter what. The fuel computer will detect the knock and adjust the fuel/air mixture accordingly to retard the knock. It will dump more fuel in so the mixture runs richer (less oxygen to create autoignition), so your fuel economy will suffer, but unless you are hauling some serious *** all the time, I wouldn't be all that concerned. If you don't believe me, you can trust Tom and Ray:
http://www.cartalk.com/content/featu...estions.html#4

http://www.cartalk.com/content/featu...estions.html#9

We drive sports cars, so we might be more lead-footed, but if you are willing to compromise on potential performance, it should be okay.

GlenL

Well, you don't have to say it out loud.

marton

BUT that discussion is about cars with high compression engines designed to run on high octane gas so not really relevant for 928.
The 928s were designed to run on the European rated 95 Octane fuel which is equivalent to 90/91 Octane in the US.

Marton

marton

Australian 98 is equivalent to 93/94 Octane as measured in the USA.

Marton

GRTWHT

Ok, I'll confess to being abnormal as well

Glenn
'81 928
AU

GRTWHT

Thanks Martin, thats interesting to know.
Cheers,

Glenn
'81 928
AU

Darklands

@Marton,

928 S 2 are designed for super plus 98 Oktan rated here in Europe.

You can drive the car with 95 oktan (Super) but you must set the Ignition tame with the codeplug.

Switzerland 928 S2 have an different ignitioncontrol than german cars.

marton

The fuel grades required by 928's (European Octane rating) are shown in this Porsche GB listing.
http://www.928.org.uk/resources/75-i...he-models.html
You have to wait a while before the list displays.
You are correct; the S2 is the only 928 model that has to be adjusted for the 95 octane.

Marton

mark kibort

im stll running 92 racing the stroker with near 11:1 compression.
I run the street cars with regular, I never floor it and it hasnt been an issue with even the tow vehicle.
I think if you are just crusing and care about gas prices, using regular is fine, just dont get on it as much.

Sailmed

Idea! Can we do a multiple vote pole for those of us who have '78 OB's running on regular, and '85 Euro's running on premium?


And what about the '80 that runs on Landshark?

Just sayin.....