Olsrey
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Registered: 13th Jan 07
Location: Bradford Drives: LET Vectra B
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What fuel octane plugs does everyone use on their C20XE Corsas?
Oliver
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craig_s
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Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
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do you mean what number should it be on??
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Kano
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Registered: 29th Aug 04
Location: Fife
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My numbers are worn off. I've never noticed a huge difference in any of my old cars but my current Cavalier only runs right one way round, the other way makes it hold back and have a high tickover..
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Olsrey
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Registered: 13th Jan 07
Location: Bradford Drives: LET Vectra B
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What colour then? Some plugs are meant to make your car idle higher apparently.
http://www.topbuzz.co.uk/info/ron_plugs/ron_plugs.htm
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craig_s
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Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
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it's for the fuel octane rating.it should be on 95.if you change them it advances your timing iirc.
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Olsrey
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Registered: 13th Jan 07
Location: Bradford Drives: LET Vectra B
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Yes and as I've heard of some people it can increase certain characteristics of the way the engine performs
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craig_s
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Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
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yeh it will make it pink and run hotter=not good
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Olsrey
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Registered: 13th Jan 07
Location: Bradford Drives: LET Vectra B
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Well because petrol isn't stupidly expensive here I use 98 ron fuel so I could use a 95/98 ron plug if I can find one then? And just change it over if I ever need to use 95 ron fuel?
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Kano
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Registered: 29th Aug 04
Location: Fife
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Yes, but you will be hard pushed to notice a difference in a standard engine..
I dont know why the engine I've got just now makes such a big difference, possibly the cams I've got or something like that..
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craig_s
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Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
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yeh that should be ok.but tbh even when i have used optimax/vmax ive never changed the plug round as theres no point.
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22B
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Registered: 9th Sep 04
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Werent these plugs on the car as it was around the time leaded fuel was phased out? Im pretty sure thats why they are on the car, nothing to do with the RON, but was purely for the switch to unleaded
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craig_s
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Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
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no leaded fuel was phased out roughly 20 years ago.ron plugs are for other countried that use different octane fuel's like america,japan etc.
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Ste L
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Registered: 3rd Jul 06
Location: Manchester Drives: 106 16v Rallye
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quote:
Originally posted by sri power
no leaded fuel was phased out roughly 20 years ago.ron plugs are for other countried that use different octane fuel's like america,japan etc.
it was less than 20 year's about, probably 15ish
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Vaux Lad
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Registered: 15th Dec 04
Location: Stoke-on-Trent
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C20xe's dont have ron plugs
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Ste L
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Registered: 3rd Jul 06
Location: Manchester Drives: 106 16v Rallye
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quote:
Originally posted by Vaux Lad
C20xe's dont have ron plugs
they have a A/B plug - well my old one did 
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Olsrey
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Registered: 13th Jan 07
Location: Bradford Drives: LET Vectra B
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quote:
Originally posted by Vaux Lad
C20xe's dont have ron plugs
They do.
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Vaux Lad
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Registered: 15th Dec 04
Location: Stoke-on-Trent
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No they dont.
A/B plugs are nothing to do with RON.
They are to "de-tune" the engine to pass stricter emissions for foreign countries..
C20xes have knock sensors which controls ignition advance/retard, so it doesn't have/need a ron plug.
[Edited on 18-12-2007 by Vaux Lad]
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Olsrey
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Registered: 13th Jan 07
Location: Bradford Drives: LET Vectra B
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They are still used for the same purpose though?
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Vaux Lad
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Registered: 15th Dec 04
Location: Stoke-on-Trent
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Nah, they aren't.
Ron plug slightly changes the ignition map.
As far as i know A/B plug changes ignition/mixture, to change the emissions...
Leave it on the side it came on(A i think), it aint a RON plug.
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Olsrey
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Registered: 13th Jan 07
Location: Bradford Drives: LET Vectra B
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I don't actually have one, I was either going to make my own using some old resistors I have lying around or try and find one in the scrapyard. What other cars would I be able to get one from?
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22B
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Registered: 9th Sep 04
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I was told when I was in Uni studying automotive engineering, that it was to do with leaded fuel and something about emissions control as leaded fuel had very good anti knock qualities, and to save massive recalls with cars that they had the octane plug so that cars could be switched over to run on unleaded without major work being carried out
C20XE doesnt need the octane plug adjusting it will alter the ignition timing depending on the quality of fuel needed
[Edited on 18-12-2007 by 22B]
[Edited on 18-12-2007 by 22B]
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mattk
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Registered: 27th Feb 06
Location: St. Helens
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I remember leaded fuel, id say it was phased out, 12 yrs ago max
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22B
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Registered: 9th Sep 04
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quote:
Originally posted by mattk
I remember leaded fuel, id say it was phased out, 12 yrs ago max
still got a 4star leaded pump at my local fuel station, dont know why they havent removed it yet, been there for years, was reading that in some places you can still buy 4 star petrol
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mattk
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Registered: 27th Feb 06
Location: St. Helens
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I remember my mum putting 4star in our 2CV as a kid, cant have been 15 years ago cause id have only been 4 and i doubt id remember
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Ste L
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Registered: 3rd Jul 06
Location: Manchester Drives: 106 16v Rallye
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quote:
Originally posted by mattk
I remember my mum putting 4star in our 2CV as a kid, cant have been 15 years ago cause id have only been 4 and i doubt id remember
probably less than 10,wasn't long before i started driving it happened
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