Octane of fuel again

TLindley · Post by **TLindley** » Sat Mar 04, 2006 6:43 pm

When i went to Tesco's today, i noticed that their super unleaded is supposedly 99 ron. Ive never really bothered to check as i always use optimax, but what is super unleaded supposed to be? I always thought

unleaded=95
super=97
optimax=99

Noticed that other fuel companies are now starting to follow the trend,
BP have Ultimate and Texaco have Supreme.

But ive also read in many places, and i know we had a thread on it a while back, that supermarket petrol is effectively shite. Anyone been using this?

catgroom · Post by **catgroom** » Sat Mar 04, 2006 6:52 pm

Unleaded and Super-95

Optimax/BP Ultimate-97

Tescos brew-99

guitarcarfanatic · Post by **guitarcarfanatic** » Sat Mar 04, 2006 6:54 pm

In sainsburys it's 98 ron for super

TLindley · Post by **TLindley** » Sat Mar 04, 2006 7:57 pm

How come tescos is 99 ron? How do they get it that high for just super?

haz@nocturnal_development · Post by **haz@nocturnal_development** » Sat Mar 04, 2006 9:00 pm

actually optimax is normal juice but with an additive octane booster which apparently can be at different octanes dependant on how fresh it is

haz

Big Brother · Post by **Big Brother** » Sun Mar 05, 2006 12:32 pm

Here,
Sainsburyâ€™s Super/BP Ultimate - 97
Optimax - 98

TLindley · Post by **TLindley** » Sun Mar 05, 2006 12:40 pm

I wonder why britain gets all the high octane stuff? Apparently normal unleaded in the US is more like 90 ron.

guitarcarfanatic · Post by **guitarcarfanatic** » Sun Mar 05, 2006 1:05 pm

90 Ron in America Probably makes the cars less efficient so they have to purchase more! It's the same reason that diesel is not popular in america. it is more efficient than petrol and you can get similar performance so all the oil companys sell really crappy unfiltered diesel in america which makes the engines run shit so the car buyers have to stick to petrol which is less economic and therefore they have to spend more. See februarys topgear as Clarkson has good old rant about it all!

haz@nocturnal_development · Post by **haz@nocturnal_development** » Sun Mar 05, 2006 1:13 pm

government and tax

haz

Ral · Post by **Ral** » Sun Mar 05, 2006 3:10 pm

Info on fuel types and RON numbers and stuff here on Petrolprices.com . Which is btw a good (and free) way to see if you're paying the lowest possible price for your fuel in your neighbourhood

It also mentions Tesco's uberhigh RON super.

schakal · Post by **schakal** » Sun Mar 05, 2006 9:02 pm

i got hold of some avgas the other day ,
100 octane prop fuel for aircrafts ,cant dare to stick some in the tank however

robkendall · Post by **robkendall** » Sun Mar 05, 2006 9:11 pm

avgas will be ok for a little while....we used to run drag cars on it all the time. Basically it was the same block and injectors etc, so cant see it doing much damage to a bog standard?

didnt jamo or lee put up the high octane fuel recipe once?
if youre interested search for it......

rgrds
rob

robin_xr4i · Post by **robin_xr4i** » Mon Mar 06, 2006 8:43 am

catgroom wrote: Tescos brew-99

Might be 99 ron, but in performance ford they tested loads of high ron pump fuel. Optimax was the best, they tested it on a 521 bhp sierra cosworth (thats with 95 ron).

The Tesco's stuff was not much better ran like 10 bhp more with a bit of ignition advancment.

But out of all the ones tested Optimax was best the ran it with a bit more ignition advancment (again) but the power was 547 bhp.

I would say thats pretty conclusive.

robin_xr4i · Post by **robin_xr4i** » Mon Mar 06, 2006 8:49 am

TLindley wrote:I wonder why britain gets all the high octane stuff? Apparently normal unleaded in the US is more like 90 ron.

I you go to japan there pump fuel is like 100 ron thats why you should not run imports on anything less than super unleaded!

My XR4i was never converted to unleaded so i used additives. But i found a coulpe of garages who still sold 4 star* which is 100-101 ron. The car felt like 1000000% better only disadvantage was it was Â£110 per litre!

(*government lets some garages sell 4 star to keep classic car nuts happy)

martinholmesuk · Post by **martinholmesuk** » Mon Mar 06, 2006 8:57 am

Standard stuff here is 91 ron
super is 95 ron
but you can get 100ron at some places and the prices r not much more .then standard

TLindley · Post by **TLindley** » Mon Mar 06, 2006 5:32 pm

I believe Britain and Australia and New Zealand are the only ones with Optimax, but i might be wrong. Sure that they dont have it in the US.

My XR4i was never converted to unleaded so i used additives. But i found a coulpe of garages who still sold 4 star* which is 100-101 ron. The car felt like 1000000% better only disadvantage was it was Â£110 per litre!

I think you mean Â£1.10

Jamo · Post by **Jamo** » Mon Mar 06, 2006 6:44 pm

optimax is 98 ron always, the reason optimax is different is because the mon rating changes dependant on the batch

and all super unleaded petrol is just normal petrol with additives

what makes good petrol is the difference between the ron and mon rating

ron is bit like bhp and mon like torque, people only seem interested in the bhp when torque is very important.

http://www.btinternet.com/~madmole/Refe ... ONPON.html

robin_xr4i · Post by **robin_xr4i** » Tue Mar 07, 2006 8:17 am

TLindley wrote:I believe Britain and Australia and New Zealand are the only ones with Optimax, but i might be wrong. Sure that they dont have it in the US.

My XR4i was never converted to unleaded so i used additives. But i found a coulpe of garages who still sold 4 star* which is 100-101 ron. The car felt like 1000000% better only disadvantage was it was Â£110 per litre!
I think you mean Â£1.10

oops!

Volvo 480 Club Europe

Octane of fuel again

Octane of fuel again

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