Which petrol
- Thread starter nick3814
- Start date
] up my injectors using supermarket fuel so now only use Optimax now.
Guest
New member
Hi,
I just sold my SC thhis weekend and in its documentation it had a Porsche Tech fax from 99. It clearly states that the 3.0 SC runs on 95 RON (standard unleaded octane rating) and the higher 98 RON.
Bones and I both run our cars on both fuels depending on how we are going to be driving, if I was using my car for long distance motorway work I would use the standard unleaded purely because of cost, but if I new I was going for a fast A road run and the tank was empty I would run off the super unleaded fuels as it does seem to make a diffence.
Welcome to the SC register (I assume you will be sending Bones (Pete) your details to add the car to the register)
Rats
I just sold my SC thhis weekend and in its documentation it had a Porsche Tech fax from 99. It clearly states that the 3.0 SC runs on 95 RON (standard unleaded octane rating) and the higher 98 RON.
Bones and I both run our cars on both fuels depending on how we are going to be driving, if I was using my car for long distance motorway work I would use the standard unleaded purely because of cost, but if I new I was going for a fast A road run and the tank was empty I would run off the super unleaded fuels as it does seem to make a diffence.
Welcome to the SC register (I assume you will be sending Bones (Pete) your details to add the car to the register)
Rats
Nick. as others have said, standard unleaded is fine. Don't worry about the rating just stay clear of 'Supermarket petrol' as they don't always have the additives that are in the main brands.
You won't have a problem until you get one!! (Grandad was in fine health until the heart attack killed him) If you find that 'Ultimate' makes that much difference you should ask yourself a few questions.
bones
New member
There's a considerable difference between the octane rating of supermarket fuel and Optimax Geoff and there may even be some 'quality' issues with supermarket fuel although I don't know how to apply the word quality to fuel. Higher octane fuel just burns more efficiently hence the detectable if slight performance benefit, I don't think engine tuning has anything to do with it. for what it's worth my SC runs fine on supermarket fuel but I occasionally treat it to Optimax, the biggest comparison between high and low performance on CIS engines is to compare the relatively flat performance on a blisteringly hot day with that on a cold crisp morning or evening when the engine really puts out it's maximum BHP.
Guest
New member
Absolutely. Most of my fast driving in the car is on the way to work at 5am, or on a late night blast through the lanes, and when the air is cold and dense you can really feel the difference between Ultimate and Regular. Ultimate is 98, so of course will immediately feel totally different against 95. Same as 99 feels completely different to 98 and 100 is Nutterly Butterly compared to any of them - that's why the 100 is twice the price.
A buddy of mine at Heathrow used to work for C&E at the big Shell depot by the Thames Estuary, he was adamant that all the fuel trucks filled up from the same tanks and used to laugh out loud when people said Shell 95 was any different to Tesco or Sainsburys.
I can only talk about my own experience. I've driven 35-40k miles a year on supermarket fuel over last 8-10 years and no fuel worries so far. My last company car covered 75k on Tesco fuel and was still getting faster when I got shot of it. We run 4 vehicles on Tesco fuel and not had anything kick off yet in the fuel system department. I only use the Redex to counteract against the weeks of sitting about my car sometimes does, not to up the spec of supermarket fuel.
Mind you, I regularly drive the you-know-what out of everything I own and there are never any deposits worth talking about on any of the heads from my own engines that I have seen apart, so that might have something to do with it.
That 207.6 bhp run at Weltmeister was done on Tesco Unleaded, will try it on Ultimate next time.
bones
New member
Thanks John the States is where I'll be sourcing my HT lead from after hours wasted here today trying to track down a supplier and searching the internet. When I did find one, the sales person was a know it all who wanted to sell me very ordinary HT cable at £10.00 a meter. Taylors is used on bikes a lot so it may be the right stuff.
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