95 or 98 Octane petrol?

[mr spectraflair]

Recently bought a late 2004 4.5LW Cerb. Official Sticker near fuel filler states to only use 95 octane petrol, but according to most cars 98 Ron is used. What should she drink?
(Note, the car 'pops' a little more when filled with the 98 Octane)

Edited by mr spectraflair on Monday 26th November 11:26

[Cyclone1]

98 OCTANE.

[Buffoon]

Cyclone1 said:

98 OCTANE.

You must have caught him on a chatty day, '8' would have done it normally

[mr spectraflair]

U probably knew i was gonna ask but....
Why does it state 95 if i'm supposed to use 98. Could there be a difference in mapping on later models and would it damage the engine if i used either octane?
Thanks.

[Buffoon]

This is a TVR special. Your handbook says 98 and the sticker 95.

There have been a couple of very informative threads on this if you do a search, so I shall not cloud what has been said before, I'll probably hash it right up.

As a Speed Six owner (a.k.a. eco-warrior), It does not effect me, as the boot label and hanbook are correct.

[Cyclone1]

97 will be ok.

[methodwares]

I have used 95 when I couldn't find 97+. I just drove it nice and gently to keep the detonations to a min.

[mr spectraflair]

Mine seems to detonate more so on the 98 & feels more civilised on 95?

[Tyre Smoke]

Run it on 95 then

[mr spectraflair]

But...
Hmmm...pops or civilised?

[Mars]

Ignition advance isn't even close to the limit in an AJP8 so you could run safely on 95 on the road, even when thrashing it. You're nowhere near to the detonation ceiling. You couldn't thrash it hard enough on the road.

98 becomes a necessity on track though because of the higher temps you're likely to reach. Although coolant temp is pretty well controlled on the Cerb, oil temp will rise, leading to a reduction in your detonation headroom.

For simplicity, I run mine only on 97/98. The difference in cost is minimal so I choose that. Just in case.

[optimax sniffer]

I think that it can run as low as 92, but 95 is the normal minimum. I expect most of the time you will use shell V-power (99) or similar

[mr spectraflair]

Everyone's right!
Manual states it runs on 95 but use 98 for high performance stints.
Thank all.

[Ireland]

I use 95 virtually all the time as there is nothing else available over here.

It runs fine.

When I've had it in the UK and in France I always tried to fill it with "good stuff" and found it ran better ..... and popped more.