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#1 (permalink) |
Cool Scooby
Join Date: Jan 2006
Location: Scotland
Posts: 327
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Hi Guys,
I'm going to be going on a rather long journey round some remote parts of Scotland in the impreza... I've had a look at the shell and bp websites and there will be no optimax/ultimate or any high grade petrol available for the full journey! I'm not sure whether to fill a few plastic petrol containers with optimax and take them with me (might need quite a few) or to get some kind of octane booster and use regular fuel with it. I've never tried these octane boosters before so I've no idea what there like.. What's my best option ?
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#2 (permalink) |
Obsessed Scooby
Join Date: Sep 2004
Location: North Hampshire, UK
Posts: 8,711
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Think personally I would just buy some booster, much safer option too, wouldnt want to be driving around with a boot full of fuel....
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#5 (permalink) |
Administrator
Join Date: Apr 2004
Location: Here and S.Wales
Posts: 13,155
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BUT i should add. When i spoke to subaru about something similar --- Subaru would prefer you put standard 95RON fuel in the car (uk car wouldnt do any damange) you would notice a dip in performance - just fill up with (*RON whenever possible.... Subaru dont recommend the use of Octane Boost. (CVC Cardiff).
Hope that helps. |
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#6 (permalink) |
Senior Scooby
Join Date: Jul 2004
Location: Bristol UK
Posts: 1,547
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I have put a tenners worth of 95 ron in mine at times to get me to a shell to fill up and thats an import....
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#7 (permalink) |
Cool Scooby
Join Date: Jan 2006
Location: Scotland
Posts: 327
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Thanks for the input guys.
I'm still swithering on what to do. 1. Using 95ron fuel - I really don't want to do this. As I understand, the Engine Management System detects lower RON fuels by detecting the onset of knocking, retards the engine timing to suit. It will then run on these lower settings until such time that the ecu is reset. If you then put higher RON fuel back in, performance will gradually get better, but unless the ecu is wiped, it would take an infinite number of re-sampling cycles for the effect on the average to be overcome. I've read versions of the above on various websites... 2. octane boost - I've just read today on another website that almost all octane boosters contain lead, to some extent - which can damage the catalytic converter. 3. carrying a couple of extra cans of fuel will put extra weight in the car + *might* be dangerous. Not sure which way to go but options 2 and 3 are looking less attractive every time i think about it. Is it worrying I'm putting safety below 'car damage' on my list of concerns ;o)
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#8 (permalink) |
Administrator
Join Date: Apr 2004
Location: Here and S.Wales
Posts: 13,155
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95 RON will be read by the ecu yes, BUT once running back to normal 98 RON thinkgs will get back to normal (my opinion). I would run with 95Ron until such time you can get the real stuff... It wont do any harm ! your car (if it uk) is mapped to accept the lower fuel every now and then...
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#12 (permalink) |
Cool Scooby
Join Date: Jan 2006
Location: Scotland
Posts: 327
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Just got back from my weekend away.
Managed to find an small Esso station - just one pump in the middle of nowhere which had deisel, and esso 'supreme'/super/whatever they call it - so i used that to fill up. I must say though, i did feel a difference between that and my usual shell optimax in terms of performance. The car felt slightly less powerful (but only when i really pushed it) with the esso stuff. Glad I'm back to civilisation where i can get optimax again!
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#15 (permalink) |
Cool Scooby
Join Date: Jan 2006
Location: Scotland
Posts: 327
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All the info about impreza's i read-up on prior to buying my car all stated that you should run it on a high octane rating fuel.
Also, inside the petrol cap it states "use unleaded 98RON fuel ONLY".
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