s1 111s is it worth using super unleaded ?
Discussion
No, not really.
The K-series engine doesn't have a knock sensor and is mapped for 95 RON fuel, so in theory there are no perfomance benefits from using super unleaded.
However... some people claim that their engines feel more responsive or smoother (placebo effect?) and some of the better quality fuels have additives which may keep your valves and injectors cleaner over large mileages.
The K-series engine doesn't have a knock sensor and is mapped for 95 RON fuel, so in theory there are no perfomance benefits from using super unleaded.
However... some people claim that their engines feel more responsive or smoother (placebo effect?) and some of the better quality fuels have additives which may keep your valves and injectors cleaner over large mileages.
Ive been using Shell V Power for the last month & i have noticed a huge difference in the way the engine performs! Yes it does feel more responsive & for the extra £2 it costs to fill it up, im getting approx 30 miles out of a full tank. Also the reason why i started using V Power is because my engine was "pinking" in any gear & at any speed at the moment full throttle was applied & since using this stuff i hav'nt had any "pinking" what so ever.
i meant extra compared to what i use to get... 
boobles said:
...the reason why i started using V Power is because my engine was "pinking" in any gear & at any speed at the moment full throttle was applied & since using this stuff i hav'nt had any "pinking" what so ever.
If you were suffering from pinking on 95 RON, then you have an underlying problem. Has the engine been modified in any way?
Dunno. On a 'traditional' engine with clockwork ignition, first supsect would be a badly coked up cylinder head causing 'hot spots', or ignition timing that is too far advanced. The latter should only be possible on a K-series if it has been assembled incorrectly or, possibly, if there is a fault with one of the sensors.
Your best bet is to get it hooked up to a suitable digital engine analyser; they'll be able to tell you if there's anything wrong very quickly.
Your best bet is to get it hooked up to a suitable digital engine analyser; they'll be able to tell you if there's anything wrong very quickly.
Sam_68 said:
Dunno. On a 'traditional' engine with clockwork ignition, first supsect would be a badly coked up cylinder head causing 'hot spots', or ignition timing that is too far advanced. The latter should only be possible on a K-series if it has been assembled incorrectly or, possibly, if there is a fault with one of the sensors.
Your best bet is to get it hooked up to a suitable digital engine analyser; they'll be able to tell you if there's anything wrong very quickly.
I have had the car tested for timing etc & they could not find any faults. Your best bet is to get it hooked up to a suitable digital engine analyser; they'll be able to tell you if there's anything wrong very quickly.
boobles said:
I have had the car tested for timing etc & they could not find any faults.
Have they checked that physical TDC is actually where the sensor is telling the ECU it is?Camshaft timing? Correct grade of spark plugs?
Are you sure it is actually pinking and not, for example, the rattle of a loose exhaust baffle (or the resonant period at around 2,500 rpm that some S1's suffer from, which Lotus 'fixed' by offering an exhaust steady bracket)?
All I know is that a K-series definitely shouldn't be showing any signs of pinking on 95 RON fuel.
There was a little bit on this thread the other week.
D
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
D
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
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