95 or 98?

[softtop]

I took the trouble to read through the handbook today. It suggests 95 for normal road use and 98/99 for track days. Why would this affect the car's performance? If it is set up for 99 then use it, set up for 95 then you are wasting your money with 99 with no turbo in sight, somebody please correct me.

[glow worm]

Mine's only ever had V-Power nothing else

[kevin63]

It seems to have been reported before that people have had pinking with the lower octaine fuel, I suppose you would be ok with the lower fuel as you suggest, but I personally use the higher rating even though it says to use normal fuel on my filler cap (or near it)

By the way Stuart, I have cleaned your wheel nuts up ready for you.

[RWA28]

Mine's always on a strict diet of V-power!

[H10TVR]

V power nearly all of the time.(notwithstanding emergenicies)

Plus. I have now a collection of six super red plastic Ferrari's adorning my chest of drawers at home.

Edited by H10TVR on Monday 21st April 14:14

[glow worm]

I just went and filled my Chim up with V-Power and got a F430, I'm going back this afternoon to fill the Tuscan up and get another....

[MarkoTVR]

I've used 95 in emergencies a couple of times, and it doesn't seem to pick up as well as it does on V-Power. Obvious statement in some respects, but just illustrating that in my experience there is a noticeable difference.

Always fill up with V-Power other than that.

[Tuska]

I use 95. When i have used 98/99 i haven't noticed any difference.......
Even on the track i found i could put her into a spin just as well on 95.

[GALLARDOGUY]

mine runs better on '95.

i've tried higher but it seems to make the low down or off throttle response really lumpy...

[Fimbo]

sort of on topic...but replies to date only mention people using Shell Optimax - I use BP Ultimate and always have done - has anyone made use of both and is there a notable difference?

[Hexhamhc]

Just to help clear this one up, we stress to all owners with Speed Six engined cars that a diet of high-octane fuel is esential. Shell V Power, BP Ultimate, Tesco 99 Octane or any such equivalent. The rear two cylinders on the engine are virtually in the car with you and tend to run hotter than the others. Because the engine is not equipped with 'knock sensors' this leaves them more prone to 'pinking' (Detonation) and prolonged pinking (Which you can't always hear) will not be good for your engine!
In our experience the cars do run better using higher octane fuel and can do slightly more mpg. Also due to the ridiculous price of fuel now there only seems to be 2-3 pence per litre premium on the higher octane stuff, so it's not too much extra per fill-up these days!
I hope that this helps, Tony Abrams

[PDtvr]

Good explanation, thanks Tony. I've noticed slight pinking under hard acceleration on my Tuscan S when I used to use 95 octane. Switched to BP Ultimate and have never had a single reoccurence, even under maximum revs.

[Fimbo]

most helpful Tony.