if your gonna buy any octane booster.. this is the only one to get http://www.rogerclarkmotorsport.co.u...productID=2254

Stay off boost! Thats all you need to do!

Easy with a boost guage...keep in vacuum and basically you have a 8.0:1 compression N/A engine!

(A 8.0:1 ratio n/a engine can typically run 91Ron 2 star without det..eg ex-military Land Rover v8s )

Put this another way with 0psi manifold pressure a typical modern engine can run up to 10:1 compression on 95RON. You have a 8.0:1 engine. The only difference is you have the ability run under positive pressure, but you have direct control to prevent this with your right foot!

So its simple....moderate your right foot and treat the pedal like an eggshell. Keep it below 3000revs and don't lug/labour the engine (i.e drop below 2000revs with large throttle opening ). If you can't do this, I suggest selling the car as you can't adapt your driving abilities or buy octane booster.

You could re-pipe the wastegate actuator so it runs 0.5bar max boost, but thats just substituting what you should be doing with your right foot!

must be an england thing, we have plenty 99 ron up here in scotland or at least we do where i live, i filled up yesterday, typical government scare tactics

thanks ali b, im going drive like a nun and buy some octane booster just to be on the safe side :thumb:

Mate..actuly cant wait ;)

personally i would go for this one
http://www.halfords.com/webapp/wcs/s...k&iozone=PDPz1

didnt even see that one. Hopefully they will sell it in my local halfords

Unit price 3p/litre :rolleyes: numpties.

£13 and only treats 20LT of fuel. So gonna cost you an extra £39 If you wanna fill your tank.

Sure I would....Including the fuel you'd be looking at about £120

Think I'd wait for shell to restock.

I agree, wouldnt think of using anthing else, if I had to use 95ron then would add half a bottle of NF and take it easy, avoiding full boost.

just bought a bottle of this from my local halfords as I couldnt wait for the roger clarker octane booster to be delivered as recommended:

http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_21 6215_langId_-1_categoryId_255221?msg=&_$ja=tsid:35532|kw:85386& cm_mmc=Affiliates-_-AffiliateWindow-_-85386-_-n%2fa&awc=1672_1333466974_4398243c12bffbafaa419b85 b4282a9b

Have done some research on it and its meant to be a pretty good octane booster.

Have put half a bottle in just under half a tank of fuel so should do the trick.I ts so annoying driving round at a max of 3000 rpm im itching to hear that turbo spool up :norty:

A knocklink (or other knock detection device) is a very good investment for a modified scooby....especially for times like this! But you can get a dodgy batch of fuel at any time!

You have had some sound advice off some great people, JUST STAY OFF BOOST, However you will always get numpties that have spoken to a mapper for 10mins and feel they are the new yoda (ignore them):thumb:

Does this include my tank as I have just put in £15 worth to get me but of 97 Ron from bp. I felt so bad as I was putting it in. Got no vpower round cambs atall at the mo.

Pass, I'd call the great man and ask him yourself :)

I would assume (but take no responsibility for) that it would be a reasonable amount he's referring too, 1/2 tank or more etc running down to the light etc. :)

If in doubt - drive like miss daisy :thumb:

Really, I`ve never seen 97 RON :wonder: Shell does 95 and v power!

BP is 98...

Stay off boost and you will be fine. Trust the experts on here that have told you that. ;)

Car seems to be fine, nearly at the end of that tank of fuel, so looking forward to brimming her with some tasty V power :)

Im assuming i can give it the beans when shes full of the good stuff again?

Cant wait :norty:

Unless you drain the tank completely, then no. Because even with the fuel light on you'll still have about 2 gallons left in the tank. So by filling up you'll dilute the mixture but not to a full tank of 99. That's what my point about 3 tanks to dilute it enough not to cause harm when hard driving. And that's what Bob Rawle said to me, if you'd bothered to read and understand my previous comment earlier...

what ecu are you running? if its a simtek your cel light will flash if your car is detting.

I presumed by this comment that by "dilute" you meant adding premium fuel to my existing tank of normal unleaded. And yes i could see why 3 tanks worth be required to completly "dilute" the mixture. So yes i did read your comment :thumb:

The car has had 2 Ecutek remaps on it, not sure if the ecutek software will inform me if the car is detting?

Why ask if you can simply fill up and give it the beans then when my answer from a respected mapper obviously says you can't until it's diluted enough through a few tanks worth OR totally siphoned off/emptied :) That was my point.

well i have some of this in
http://www.millersoils.co.uk/automot...ket=Automotive
Incase i ever get caugh short.
Just dont hammer it stay off boost and youll be fine.

Are you serious?

Normal unleaded =95ron
Super-unleaded or premium = 97ron
BP ultimate =98 i believe.
Shell v-power and Tesco momentum = 99ron

just about everywhere sells premium unleaded 97ron. Shell probably don't because they sell 99ron.

BP ultimate is only 97ron.
Infact most supers are 97 and most normal unleaded is 95.

Tesco's fancy stuff is 99 but only sold in some stores, their normal super is 97. The old shell optimax was 98 but their VPower is 99.

id hate to be pigeon holed to shell 99, obviously people who do that dont really use it as a DD.
I know the 2011 did have 98 on fuel Cap and when u get the 320R Map they change it to 97Ron. Which for me is good as i only ever use 99 Vmax and 97ron Esso and the odd Sainsburys 97Ron.
Dont have a Tesco thats local :/

I did a 700mile run last week visiting family across (uk). I nearly ran out twice and had to use cheapo fuel. Really gauling that I then passed Shell garages only a few mles passed where I'd bottled out. Then again I did have 370miles showing on the trip and I never venture past 240 here.

Only put 20 litres in each time but drove like Ms daisy all the way for an average of 29mpg.

Did I mention that an 8:1 cr n/a 2.5litre car driving a 4wd transmision will always give utter crap fuel efficiency due pumping and transmission losses. Eugh... Hence higher cr on modern cars.

Fortunately for me I only had 3 litres left when I filled up in Lancaster. Normal service resumed.

I'm glad I fitted the boost gauge. my safety net is pulling the plug off the three-way boost regulator and setting the prosports to beep at 0.1 BAR boost. Patience of a nun helps too!

Before mapping mybscoob when it was running a catback I achieved 34mpg on a run to Lancashire and back from Scunthorpe. Couldn't believe it and the car wasn't running lean either.