Picking up 2000 boxster s on saturday - fuel !

[Guest]

Do i need super unleaded, or is regular okay ?

Thanks for any help

 

[Red Steve]

Hi..My wife has a 2.7 Boxster and she only uses normal unleaded. She's had the car for 2 years now and has experienced no problems whatsoever.

Hope this helps...enjoy your Porsche!

 

[Guest]

thanks Steve.

I'll have a go with normal unleaded and keep an ear out. I'd assumed normal u/l would be okay - but read earlier that the compression ratio is 11:1 hence the question.

Cheers []

 

[Mark_Bennett]

You definitely SHOULD use 98 octane (look in the manual and on the fuel filler).
The compression ratio is certainly a factor - the shorter spark of 95 is more likely to cause damage to the pistons/valves with a high compression ratio than 98. To prevent this the car has knock sensors which back the timing off to allow the lower grade fuels to be used, albeit at the expense of power and efficiency.

 

[Guest]

right. Thanks for that Mark. As the registry secretary im sure you must know.

I havent read the manual or looked in the filler yet - only picking it up on Saturday.

Ah well.... i didnt buy this car for fuel efficiency after all []

 

[Mark_Bennett]

You'll probably find you get better milage on the expensive (ok - MORE expensive!) stuff. [] (probably the only noticable difference in the real world[])

You can use 95 - Try finding 98 in Italy for example... but it is designed for 98 and the car compromises to allow lower grades to be used.

 

[Guest]

I have difficulty finding better than 97RON except for V-Power (99).
So I am bound to stop when I see Shell stations.
I notice a 10% more efficient when using V-Power, compared to when I have
had to fill up with 97RON. Then it was only 5% more expensive as well.

I guess they are only guideline numbers anyway.

Dr. Skids

 

[CountBrass]

Thought people might find this link useful as it explains about the different kind of fuels: http://www.petrolprices.com/about-fuel.html.

I found the comment at the end quite interesting: "Also, a few vehicles, such as the new BMW K1200R motorbike, can sense knock and adjust their engine tuning to take advantage of higher grade fuels. Another user commented that the 2004 BMW 330 also does this, according to the driver's handbook it makes 231 BHP on 98 octane and 221 BHP on 95. This ability is apparently widespread amongst German performance cars using Bosch / Siemens electronic engine controls."

I assume Boxsters fall into the category of "German performance cars"? (No idea if they use Bosch/Siemens electronic engine controls though).

 

[Porker993]

We 993 owners have exactly the same requirement for 98 RON fuel, and have had this debate often in our forum.

My only slight problem is, according to the very useful info posted above, no-one in the UK sells 98 RON fuel anymore. Sorry for shouting.

There's plenty of 97 (Esso and BP) and 99 RON (Shell and Tescos) out there, but no 98.

Now - I'm guessing 99 RON is not a problem for our cars, but surely 97 is not up to snuff ? I would be interested to hear views ?

 

[burrow01]

Correct, Shell moved from 98 RON to 99 RON with the change from Optimax to VPower

Not a big problem, but the ignition will only advance enough for 98 so no extra advantage of 99RON without a remap

Pete

 

[Mark_Bennett]

Use 99 [8D]

 

[Rickster]

Mine runs like a tank on 95 RON but sweeeet [8D] on optimax........

Plus about 10% better fuel economy []