bit of silly question i thought id ask.
is there any benefit using high oct 98, rather than normally 95?
will it damage the engine or increase anything?
I run mine solely of super and always have, mine is however now also mapped to run on super. I doubt it would do any harm 
Top man 
Nitro I believe the ECU is set for both, all part of the self learning from memory, it’s the 105 from BP that I’ve heard will give you problems…I’d stay clear.
At the risk of starting an avalanche of posts I runon Tesco Super. The is the only fuel that I have found that works well with low revs (2000 to 4000). We also use this on our Kart and never had an issue. It claims 99 RON, I am not sure if this is actually true but it works well for me. Now in a couple of years I may be moaning about blocked injectors, I just don’t know if Tesco use a detergent or not.
i too use tesco 99, following some research i read - here, or mloc or seloc where it seemed to be the only “standard” fuel to offer a bit of performance improvement. i believe it also contains some detergents so shouldnt block stuff up. i get approx 15-20 more miles out of a tank, but it varies greatly due to 2nd cam use. its 5-6p more a litre so extra miles cost more.S1’s i m sure see no benefit, or is it diffrent for the VHPD??
richbk
There is no ‘knock’ sensor on the VHPD, so ignition maps remain as programmed and dont advance if higher octane fuels are detected.
Having said that, my Emerald was mapped right up against knock, so crap fuels did cause ‘pinking’… NOT good in a VHPD! I always ran BP Optimax which for some reason seemed better that Shell ‘V’ power. I also found that during the winter, the pinking returned… I gathered that the fuel is a different ‘formula’ during those cold months. So ended up using STP ‘Octane Boost’ which resolved the pinking totally!
Could have also retarded the ignition timing map on the Emerald but did not want to undo Dave Walkers hard work.
All this is, of course, in the past. 
I can’t really comment on Tesco fuel for ultimate power. For Mid Range it subjectively feels much better on my standard 190 S1
I use Tesco Super as they are the closest garade to me and I get clubcard points
not the one at rbs in southend ade!!!, i go to shell, im still confused what is the advantages for putting in high oct (v power). just dont wana put it in and it blews up worst poss outcome
Yep that is the Tesco, the Shell at the Bell is close to but not as easy to get to, I see no reason why you could not use Super, I used it in mine from day one, I only see it as a good thing
i have the s2 tho, has anyone go an s2 220 i have included the upgraded intercooler,oil pan, ecu, and sump thing.
worst situation i dont want my car blowing up lol
High octane fuel is used to stop pre-detonation. Using 99 Ron verse 95 Ron in an engine that is designed for 95 RON should not give any power increase but should also not cause any harm. The only exception is when a knock sensor is fitted, this listens to the combustion and if it hears pre detonation it will retard the ignition. Usually these work backwards to protect an engine, I am not aware of any production systems that work on the principle of advancing until they hear pre-detination.
I am pretty sure my Exige S1 would run on 95 RON without any engine damage, but for �1.50 a tank it is not worth the risk and I do think mid range is improved slightly.
With regard to the S2 I would give the technical department a ring at Lotus as they are the experts and are very helpfull.
Also if you are going to the SELOC garden party at Heathel there are usually Lotus Sport staff there that could advise.
The S2 S does use a knock sensor and the ECU learns by adjust fuel trim (long and short term) but on WOT there is no learn just a map and a knock sensor, you should not do any harm at all using 99ron over 95ron, when I got mine Lotus said either was fine when I asked as it was not stated in the manual…