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General => General discussion => Topic started by: Whittle55 on 26 May 2004, 15:30
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My car runs om LRP at the moment but the garages that sell it around my area are pretty rare,
Can i change to unleaded or similar? Does the timing need to be altered if so by how much??,
Thanks
Andy.
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if you have certain valves the timing can be changed.
not a big job- just needs to be done correctly.
LRP was supposed to be already phased out... :o
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There is a filter you put in the fuel line and it converts it. It costs about ?50 to do and is available from www.gsfcarparts.com
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you can run it on Super Unleaded without having to make any timing adjustment, and it wont do any damage whatsoever
both are 97 RON fuels
VW's dont need the lead additive, they have been using hardened valve seats in their aluminium heads since the mid 70's
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both are 97 RON fuels
VW's dont need the lead additive, they have been using hardened valve seats in their aluminium heads since the mid 70's
So presumably, I can run my old 1985 Audi 100 on super unleaded?
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u sure can
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Question has to be asked as to why you are running LRP at the moment?
It's not a performace fuel and should only really be used by granny in her metro of maestro that can't use unleaded fuel. ALL VW's built since about 1977 can use unldeaded fuel provided it is of the correct grade, otherwise the ignition will have to be retarded.
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I've found that a more mature dub that's never run on unleaded may start pinking (pre ignighting) a little when run on some unleaded fuels as the octane is lower than what 4 star used to be. Mind you saying that I think LRP was even lower than that! Shell's optimax is the best but not always a garage when you need one. The little extra you pay is well worth it. If it' s not available and your dub starts making pinking noises on unleaded, just get ur ignition timing retarded a couple of degrees otherwise you can cause damage to ur valves over time. ;)
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Retro cars said 4 star was closer to 100 octane. not sure on LRP though. Super/Optimax should be alright.
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One thing to bare in mind when changing grades of fuel is the timing issue.
If you have a knock sensor then your engine can adjust itself to benifit, as long as it's a higher octane ofcourse. If it's lower it can still 'adapt', but performance will obviously be less ...
Setting the timing up for a certain fuel without a rolling road is dam hard, if not impossible.
Best to keep to the factory timing settings and do your best to match the recommended grade of fuel for the car, otherwise it's a waste!
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Retro cars said 4 star was closer to 100 octane. not sure on LRP though. Super/Optimax should be alright.
nice and vague from Retro Cars there...
I recall 4Star was 97RON, while LRP has never actually had an offical RON rating so can be 97or 96RON (possibly 95 but ive never seen it that low). Ordinary unleaded is 95RON, though you'll see other ratings particuly for the Super stuff. Optimax is 98RON.
Only timing needs to be adjusted, all these fuel filters, additives, hardend valve seats etc are a con. Any car destined for the German (probaly other eropean countries too) hav been desgined to run on unleaded since the mid-late 70s. So unless you driving a Trimph, MG or what ever just adjust the timing and switch to unleaded
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Question has to be asked as to why you are running LRP at the moment?
because i live in N.ireland where you cant get optimax, and SUL is 88.9p a litre and LRP is 81.9p a litre
LRP is simply SUL with a lead substitute, both are 97RON
there is method behind the madness