Marc
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Registered: 11th Aug 02
Location: York
User status: Offline
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Thought it was just America that got the low stuff!  
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Cybermonkey
Member
Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline
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no, we have a lot of local built cars that need the 91RON IIRC. but we get 101RON so who cares 
i heard that the new F6 Typhoon gets a 50bhp boost just from using 101 over 98 
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Marc
Member
Registered: 11th Aug 02
Location: York
User status: Offline
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Blimey!!! Mine gets an extra 13bhp from using SUL over unleaded No, really! 
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Cybermonkey
Member
Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline
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the F6 has some fancy jiggery pockeery though, increases and decreases boost pressure electronically depending on ambient temps.
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Marc
Member
Registered: 11th Aug 02
Location: York
User status: Offline
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Like an extreme knock sensor?
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Cybermonkey
Member
Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline
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yes. i heard you can lay them flat to get an extra 26bhp though 
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beattie17
Member
Registered: 13th Dec 02
Location: perth Drives: 02 ibiza 20v turbo
User status: Offline
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ive been using normal unleaded since i got car! will fill up tank with optimax on friday n see if it runs any different!
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DarkBahamut
Member
Registered: 4th Jun 06
Location: Cambridge, Cambridgeshire
User status: Offline
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quote:
Originally posted by Marc
Thought it was just America that got the low stuff!
Octane ratings in the UK and US arent worked out the same, which is what makes the difference in the number. Optimax based on a US octane rating would be around 93-94 while the highest in the US is around 91-92, in rare cases 93, so US fuel is really any lower rated than UK fuels.
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Cybermonkey
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Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline
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quote:
Originally posted by DarkBahamut
quote:
Originally posted by Marc
Thought it was just America that got the low stuff!
Octane ratings in the UK and US arent worked out the same, which is what makes the difference in the number. Optimax based on a US octane rating would be around 93-94 while the highest in the US is around 91-92, in rare cases 93, so US fuel is really any lower rated than UK fuels.
i live in Australia, our research octane numbering system is identical to the united kingdom
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Cybermonkey
Member
Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline
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so 91RON here is the same as 91RON in UK, just you dont get it served at the pump anymore
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a_j_mair
Member
Registered: 23rd Jan 04
Location: Scotland
User status: Offline
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quote:
Originally posted by beattie17
ive been using normal unleaded since i got car! will fill up tank with optimax on friday n see if it runs any different!
letus know if you think it make any difference
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DarkBahamut
Member
Registered: 4th Jun 06
Location: Cambridge, Cambridgeshire
User status: Offline
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I was replying to the thing about only America getting the low stuff, since they do have high octane fuels too  .
One comment on low octane fuels though, they arent really as bad as people think. My friend in the US drives a 93 2nd gen Integra with a 1.8L 140bhp engine. Thats designed to run on 87 octane (about RON92) and will do so no problems even with 155,000 miles on it. So clearly lower fuels arent that bad either.
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Cybermonkey
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Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline
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that depends on the engine though, some engines cannot retard the timing enough when using low octane fuel, and it can lead to pre detonation and all sorts of nasty stuff, pinking etc. my 1.8 Barina isnt meant to be run on 91, strictly 95 and upwards, but my old 2.0 Camry loved 91RON fuel.
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DarkBahamut
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Registered: 4th Jun 06
Location: Cambridge, Cambridgeshire
User status: Offline
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Its not really about retarding the timings though. His integra would run on 87 octane without retarding the times at all and still put out the full 140bhp from the 1.8, as thats the cars recommended fuel. It is down to the engine itself though, some engines just seem to require higher octane for some reason even if they rev lower, put out lower power, lower compression, etc. Probabaly just lazy engine designers .
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Corsa_Sri_93
Member
Registered: 25th Jun 02
Location: Bitchin' Hitchin
User status: Offline
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I've been running Tesco 99ron in my Prelude because that's what was recommended to me due to it being a Jap import and petrol in Japan being 99ron also. However, i recently noticed the car was a little bit hesitant when pulling hard through the gears so i've just gone back to optimax for a bit. Much smoother now. Might try some injector cleaner on the next fill up too.
Any recommendations on injector cleaner ???
[Edited on 18-07-2006 by Corsa_Sri_93]
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Cybermonkey
Member
Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline
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quote:
Originally posted by DarkBahamut
Its not really about retarding the timings though. His integra would run on 87 octane without retarding the times at all and still put out the full 140bhp from the 1.8, as thats the cars recommended fuel. It is down to the engine itself though, some engines just seem to require higher octane for some reason even if they rev lower, put out lower power, lower compression, etc. Probabaly just lazy engine designers .
that makes no sense. ALL engines need to retard/advance timing for the RON of fuel. if its by means of a RON plug or knock sensor, they all have to do it.
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
User status: Offline
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he will be slowly stripping the linings on his cylinders from running fuel that low, pre ignition det causes this, the timings have to be correct for the fuel
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DarkBahamut
Member
Registered: 4th Jun 06
Location: Cambridge, Cambridgeshire
User status: Offline
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quote:
Originally posted by Cybermonkey
quote:
Originally posted by DarkBahamut
Its not really about retarding the timings though. His integra would run on 87 octane without retarding the times at all and still put out the full 140bhp from the 1.8, as thats the cars recommended fuel. It is down to the engine itself though, some engines just seem to require higher octane for some reason even if they rev lower, put out lower power, lower compression, etc. Probabaly just lazy engine designers .
that makes no sense. ALL engines need to retard/advance timing for the RON of fuel. if its by means of a RON plug or knock sensor, they all have to do it.
The knock sensor is designed to retard the timings when engine 'knocking' is detected, thus reducing the risk of engine damage. The knock sensor doesnt advance the timings higher than the set timing for the engine if knocking isnt detected, so once your using a fuel of high enough octane to stop any knocking or detonation then the knock sensor doesnt do anything more to your engine timing.
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DarkBahamut
Member
Registered: 4th Jun 06
Location: Cambridge, Cambridgeshire
User status: Offline
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quote:
Originally posted by Steve
he will be slowly stripping the linings on his cylinders from running fuel that low, pre ignition det causes this, the timings have to be correct for the fuel
Who will be?
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
User status: Offline
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ian griffiths
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beattie17
Member
Registered: 13th Dec 02
Location: perth Drives: 02 ibiza 20v turbo
User status: Offline
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quote:
Originally posted by a_j_mair
quote:
Originally posted by beattie17
ive been using normal unleaded since i got car! will fill up tank with optimax on friday n see if it runs any different!
letus know if you think it make any difference
Will do
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mav
Member
Registered: 19th Jun 01
Location: Scotland
User status: Offline
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Volvo recommends my T4 to run on 98 ron fuel so I use optimax..But I have also been using ultimate at 97ron and don't feel no difference between the 2.
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Ry_B
Banned
Registered: 1st Dec 05
Location: Solihull, W Mids Drives: 45BHP beast!
User status: Offline
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Optimax is better in my experience.
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DarkBahamut
Member
Registered: 4th Jun 06
Location: Cambridge, Cambridgeshire
User status: Offline
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quote:
Originally posted by Ry_B
Optimax is better in my experience.
quote:
Originally posted by Ry_B
Drives: 45BHP beast!
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Nath
Member
Registered: 3rd Apr 02
Location: MK
User status: Offline
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Anyone tried BP's 102RON fuel? It's only available at a few sites IIRC. Saying that its £2.?? per litre!
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