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View Full Version : Shell Optimax Fuel Vs BP Ultimate Fuel



Kenyon
15-11-2005, 07:14 AM
Well, fifth gear was interesting when they tested the differnet fuels. Shell Opitmax come out best for performance enhancement giving more BHP and more Torque all round when tested on the Golf GTI and best results come from the Scooby.

Then BP Ultimate came out second and supermarket fuel third.

I guess Optimax works best on performance cars only, does not make a difference on bread and butter cars like the clio. Best stick to supermarket fuel for bread and butter cars.

I am sticking to Optimax fuel, never used anything else in the Ferrari for four years now. I have noticed a difference in responsivness.

EVO magazine did the same test a couple years back and came out with same results. No gimick fuel when used in performance cars !!

F328GTS
15-11-2005, 09:34 AM
Does anybody know if this works on older cars like my 328? They did say on 5th Gear that modern cars adjust their timing to allow for the fuel, but I can't imagine my 328 being able to do that. I do use Optimax, but am I wasting my money?

steve f
15-11-2005, 09:43 AM
Does anybody know if this works on older cars like my 328? They did say on 5th Gear that modern cars adjust their timing to allow for the fuel, but I can't imagine my 328 being able to do that. I do use Optimax, but am I wasting my money?
IN ONE WORD YES
:thumbsup: :thumbsup: :thumbsup: :thumbsup: :thumbsup:

Sledge
15-11-2005, 10:01 AM
Your 328 when new would have run on a fuel with a much higher octane level than the standard 95.

You will notice a big big difference when running on a higher octane fuel, the old four star was 100 octane, I think. Also fuel such as Optimax will contain additives which will help prevent build up on valves etc, this will increase the engines efficiency.

You should also check that your car's timing hasn't be set to use 95 octane fuel, on a more modern car with an ecu the timing is automatically adjusted depending on what fuel you put in.

I have used various additives in the past to run up to 105 octane fuel, this made a considerable difference in both my Esprit and Bentley.

Nicola
15-11-2005, 10:03 AM
They ignored Tesco super unleaded (99ron), that is what my car is drinking at the moment.

p.s. I thought the survey was about getting a decent car ;)

Ravi 355
15-11-2005, 10:13 AM
Your 328 when new would have run on a fuel with a much higher octane level than the standard 95.

You will notice a big big difference when running on a higher octane fuel, the old four star was 100 octane, I think. Also fuel such as Optimax will contain additives which will help prevent build up on valves etc, this will increase the engines efficiency.

You should also check that your car's timing hasn't be set to use 95 octane fuel, on a more modern car with an ecu the timing is automatically adjusted depending on what fuel you put in.

I have used various additives in the past to run up to 105 octane fuel, this made a considerable difference in both my Esprit and Bentley.

So how would it fair in a 355? Car has an ecu, but is the ecu clever enough to detect a fule with higher octane?

shao_khan
15-11-2005, 10:14 AM
So they didnt test the Tesco 99? Thats poor form,I have been using that of late and certainly havent seen any performance declines. Never thought much to the BP ultimate, and around here some stations had the BP at 10p a l more than Optimax - I dont think so.....

F328GTS
15-11-2005, 10:33 AM
Ok, I am going to email 5th Gear and see what they say. I will let you know if they ever respond.

SteveM
15-11-2005, 10:43 AM
I guess Optimax works best on performance cars only, does not make a difference on bread and butter cars like the clio. Best stick to supermarket fuel for bread and butter cars.
Normal everyday cars will certainly not see any real performance increases that's for sure, but people I know who use optimax in their everyday cars do see a significant mpg increase. And with the additives of optimax the engine will stay cleaner and last longer.

Steve
15-11-2005, 10:55 AM
BP Ultimate is 97 RON
Shell Optimax is 98 RON

I've never come across Tesco 99 RON - I could be tempted to try it.

angelboy
15-11-2005, 11:47 AM
I've always used standard 95 but after last night I'm going to stick Shell in it......trouble is, I don't have a shell garage close by!!!!

Kenyon
15-11-2005, 11:59 AM
Never heard of 99 Ron at Tesco. Must be a mistake or is it ???

F328GTS
15-11-2005, 12:03 PM
Never heard of 99 Ron at Tesco. Must be a mistake or is it ???
They have 99 RON at my local Tesco.

Kenyon
15-11-2005, 12:08 PM
Will that be super unleaded then ?

steve f
15-11-2005, 12:08 PM
They have 99 RON at my local Tesco.
isnt 99 RON a bit old to be serving petrol at his age :laugh: :laugh: :laugh: :laugh:

Nicola
15-11-2005, 12:19 PM
Never heard of 99 Ron at Tesco. Must be a mistake or is it ???

It is gradually being introduced to more garages (and it is cheaper than Optimax)

S11EPS
15-11-2005, 02:24 PM
They have 99 RON at my local Tesco.

Which one nige, the one down the road from me?

F328GTS
15-11-2005, 02:25 PM
Which one nige, the one down the road from me?
Yes indeed.

EK3R
15-11-2005, 02:45 PM
Listing of all Tesco currently selling 99 RON:

http://www.greenergy.com/products/99_octane_locations.html

Nicola
15-11-2005, 02:59 PM
Us southerners are always lucky ;)

GrahamS
15-11-2005, 03:03 PM
What's the quality of this Tesco's stuff like, in terms of cleanliness. Supermarket fuels aren't exactly renowned for being the cleanest fuel you can buy

Sledge
15-11-2005, 03:19 PM
It is a common misconception that a high octane petrol will make your car go faster.The octane rating of petrol tells you how much the petrol can be compressed before it spontaneously ignites. When petrol ignites by compression rather than because of the spark from the spark plug, it causes knocking in the engine :cry:

Octane has nothing to do with the energy content of the petrol. However increasing the compression ratio of an engine of a given displacement will increase the horsepower. Using a higher octane petrol allows a higher compression ratio before knocking and thus more horsepower. So if the engine is designed from the beginning for higher octane petrol, it will have considerable advantages in power and economy. A modern performance car with ECU's etc should be able to alter the timing to compensate for 95/98/100 RON petrol.

As stated it all depends on what fuel they have designed the engine for, within your manual it should state the RON recommended for your car.

Raising the octane level of your petrol in a non performance car will primarily help prevent knock. If your engine is not currently knocking, you won't see any significant advantages of using higher octane petrol.

Most of the high octane petrol on sale is a higher quality than that in the supermarkets and also have additives which help clean the engine.

EK3R
15-11-2005, 03:47 PM
Blurb on the 99 octane stuff:

http://www.greenergy.com/products/99_octane.html

and a .pdf giving its technical specs:

http://www.greenergy.com/products/technical_product_info/product_specs/99_octane.pdf

Any petrochemical engineers out there??

Kenyon
15-11-2005, 06:05 PM
I have been speaking to a couple of petrolchemical engineers and Fluid specialists at Concophillips just up the road from me. They tell me Shell Optimax is rated above 98 RON actually 98.9 Ron but is advertised at 98 RON due to trading standards. I am unsure how true this is, but they do tell me supermarket fuel is not as good and will not clean as well as Shell Opitmax or BP Ulitmate. They use additives that are better then what the supermarket use and thats why the the price per litre is higher.

This was all identified in the EVO magazine test which was preformed 2-3 years ago. They actually stripped the engines down and tested the cars to determine BHP and Torque.

Really good article....

I am stickigh with Shell Opitmax.

Kam
15-11-2005, 07:24 PM
This was all identified in the EVO magazine test which was preformed 2-3 years ago. They actually stripped the engines down and tested the cars to determine BHP and Torque.

Really good article....

I am stickigh with Shell Opitmax.

I remember reading the article in Evo a while, really interesting results after a 1000 miles in a couple of different cars. The before and after shots of the engine internal clearly showed optimax works. They tested regular against optimax as Ulitimate wasn't around then.

I swear by Optimax, but limited stations even in Central London so the 360 sometimes drinks normal super. I've seen the Tesco 99 RON fuel but not used it.

panterasteve
15-11-2005, 09:01 PM
i too watched the results on fifth gear and was quite impressed,personally ive shoved whatevers cheapest in any of my cars (typical yorkshire tight ****) so im looking foward to using whatever left in the tank and filling up with optimax.i did noticed they reset the ecus on their cars does any one thing its worth turning the battery of to reset ecu or will it work it out for itself?

tom
15-11-2005, 09:06 PM
i too watched the results on fifth gear and was quite impressed,personally ive shoved whatevers cheapest in any of my cars (typical yorkshire tight ****) so im looking foward to using whatever left in the tank and filling up with optimax.i did noticed they reset the ecus on their cars does any one thing its worth turning the battery of to reset ecu or will it work it out for itself?
I was always under the impression that after you've worked a few tankfulls through, the ECU will have worked it out. Although the more sensitive, high end cars may be different...

panterasteve
15-11-2005, 09:11 PM
I was always under the impression that after you've worked a few tankfulls through, the ECU will have worked it out. Although the more sensitive, high end cars may be different...

dont know tom ,but they must have done it for a reason,the bhp figures they were getting on fuel alone i thought were very high, in fact too good to be true,hope im wrong though.

tom
15-11-2005, 09:12 PM
dont know tom ,but they must have done it for a reason,the bhp figures they were getting on fuel alone i thought were very high, in fact too good to be true,hope im wrong though.
I thought they were just resetting the ECU between tankfulls to save time, ie not have to run a few tanks of fuel through before the ECU worked out it had richer fuel to play with...

panterasteve
15-11-2005, 09:23 PM
I thought they were just resetting the ECU between tankfulls to save time, ie not have to run a few tanks of fuel through before the ECU worked out it had richer fuel to play with...

well i guess i will find out,thats if it aint too cold and the council dont start salting the roads otherwise it will have to wait,

ric355
15-11-2005, 09:34 PM
I thought they were just resetting the ECU between tankfulls to save time, ie not have to run a few tanks of fuel through before the ECU worked out it had richer fuel to play with...
The purpose of resetting the ECU is to ensure that results from the last test don't skew the results of the next test. It means each test starts from the same point, and thus the results of the different fuels can be compared to each other.

I think in practice the learning ability from a knock point of view is almost instantaneous - i.e. the timing is altered many times per second by the ECU to keep the engine at its most efficient. They did each test numerous times to make sure the results were repeatable.

One thing I noticed was that they used a turbo car for the high performance vehicle, which clearly can achieve a denser mixture. I wonder if the gains on a normally asiprated performance car would be a lot less.

Philjay50
15-11-2005, 10:03 PM
On the subject of petrol, I went into an Esso garage the other day near to were I work, not a place i use normally (although they now have an Alfa dealership).They sold 4* fuel, not seen any of that for years. Bearing in mind I have a couple or so of 1970's vintage cars this was a real find.
The other thing I found strange was that it stated on the pump, it was NOT Esso fuel. Any body know who markets the stuff.

tom
15-11-2005, 10:05 PM
On the subject of petrol, I went into an Esso garage the other day near to were I work, not a place i use normally (although they now have an Alfa dealership).They sold 4* fuel, not seen any of that for years. Bearing in mind I have a couple or so of 1970's vintage cars this was a real find.
The other thing I found strange was that it stated on the pump, it was NOT Esso fuel. Any body know who markets the stuff.
There's a Sainsbury's just off Jct22 of the M25 that sells 4* :shocked:

EK3R
15-11-2005, 10:14 PM
Pistonheads has carried out a test of the Tesco 99 RON:

http://www.pistonheads.com/news/default.asp?storyId=12400

F355GTS
15-11-2005, 10:52 PM
Philjay



Details of bayford, the UK suppliers
http://www.jec.org.uk/thrust.htm

Bromers
15-11-2005, 11:19 PM
Don't forget to collect Shell Pluspoints - you could well be proud owner of a Ferrari jacket in approx 8 years !!

Rick

rmdferrari
16-11-2005, 12:52 AM
I've been using Tesco 99 RON for a few months now, can't tell the difference between it and Optimax...... only it's to be found 3 miles nearer and it's cheaper. I chuck in a bottle of Millers Octane boost for another 1 or 2 points, so perhaps 100-101 octane total?

Garage 7 miles away still sell "full fat" 4 Star, should I be tempted at 1.36?

F328GTS
16-11-2005, 09:17 AM
As stated it all depends on what fuel they have designed the engine for, within your manual it should state the RON recommended for your car.

The 328 manual says 98 - 100 RON 4* or 5*, so I will be sticking with Optimax.

Sledge
16-11-2005, 11:03 AM
The 328 manual says 98 - 100 RON 4* or 5*, so I will be sticking with Optimax.

You should also add "Silkolene Pro boost", this will effectively raise the RON value of Optimax (98 RON) up to a 100-101 RON with is the same as 5*. "TetraBOOST" can also be used if your car is setup to run on leaded fuel.

MalcH
16-11-2005, 02:04 PM
The 328 manual says 98 - 100 RON 4* or 5*, so I will be sticking with Optimax.

Edzackerly the same as my Mondial.

I have just used Esso Super Unleaded to date in it.
The previous owner said I should use Super, but it is OK to use Premium on occasions.

The nearest Shell Optimax is Knutsford I think.. nah there must be one nearer

Jas
16-11-2005, 02:52 PM
I believe only the 360 and 430 have a knock sensor, and therefore benefit from higher octane fuel.

I use optimax in my Elise as I had it remapped for that fuel (to get the extra power). I do also use it in my 348, but appreciate there's no performance benefit :(