98+ octane fuel

[Brian ROSEN]

One real advantage

I agree with ....I use 99 octane but don't notice a significant difference personally I think its all Bullshit!...and my reason for sometimes using 98 is because there is generally no queue at that pump and very little difference (perhaps one or two centimes a litre) in the price)

 

[alimey4u2]

Well..that went well..

I personally don't like being called "dearie" ( I find it offensive) but for reasons of en tant cordial I decided to let it go...

 

[strod]

Is the Tesco "Momentum" super unleaded offering also 99 RON??

 

[Jedmeister]

Is the Tesco "Momentum" super unleaded offering also 99 RON??

Don't know the answer to that as such but I was talking with someone who works in the labs for a petrochem and he said that Tesco's petrol is generally better quality than Sainsburys and the worst is Morrisons..........a lot of cabbies fill up their taxis in my area with Tescos fuel as they reckon they get more MPG with that brand.

Personally I don't understand how this is the case as I would have thought the same grade petrol comes out of the same refinery for more than one supermarket..................

 

[Brian ROSEN]

Propogabda

Don't know the answer to that as such but I was talking with someone who works in the labs for a petrochem and he said that Tesco's petrol is generally better quality than Sainsburys and the worst is Morrisons..........a lot of cabbies fill up their taxis in my area with Tescos fuel as they reckon they get more MPG with that brand.

Personally I don't understand how this is the case as I would have thought the same grade petrol comes out of the same refinery for more than one supermarket..................

...and if you talk to others 'in the know" they will tell you that it all comes out of the same tanks at the refineries; Anyhow, why do firms loke Ricardo's (if they syill exist) spend a fortune on testing fuels when any old boy on a GS will be able to tell them straightaway which is the best!!!

 

[F104]

Never looked into the 98 octane mpg bit, but from a combustion point of view the higher RON would allow the ECU to advance the ignition timing from 95 RON. This has been the easy path to increased NOx emission requirements, retard the timing but at a fuel economy penalty. Advancing the timing is not necessarily giving a BHP advantage, but it should give a fuel economy advantage although at increased NOx emission levels. I take the bike must be emission ceritified against 98 ron as 'worst' case anyway.
Interesting! Will definately try the mpg as soon as I have another one (my 1200GS was declared to be a write off today, not sure yet if or , in 'negotiation' over current value

 

[davnjud]

not scientific but I have convinced myself that the bikes runs smoother when trundling along at say 35 mph in 4th 2 up on the high octane. I have noticed variations in smoothness and it may well be to do with timing / fuel combinations.

Generally I am delighted with the fuel consumption - regularly over 55 mpg on the av gauge. Now filling up at 220 miles with 3 litres left in the tank.

Thanks for pointing out the shell v max RON - I will buying that in future.

 

[onlychild]

Stalling problem

Never looked into the 98 octane mpg bit, but from a combustion point of view the higher RON would allow the ECU to advance the ignition timing from 95 RON. This has been the easy path to increased NOx emission requirements, retard the timing but at a fuel economy penalty. Advancing the timing is not necessarily giving a BHP advantage, but it should give a fuel economy advantage although at increased NOx emission levels. I take the bike must be emission ceritified against 98 ron as 'worst' case anyway.
Interesting! Will definately try the mpg as soon as I have another one (my 1200GS was declared to be a write off today, not sure yet if or , in 'negotiation' over current value

Please see my stalling problem string...

I always fill up from Sainsbury's for my 70 mile-a-day commute on my 1200 GS. I've been suffering with stalling problems for the last 3 months and I'm wondering if the petrol is an issue. I tend to go for 95RON because of the cost but lately I've used superplus petrol (Sainsbury's) and the problem seemed to have disappeared. However, Monday I filled up with 95 and that same day on my return journey the engine cut out changing from 2nd - 1st whilst filtering. And it also feels lumpy, whereas before it felt really responsive.

I'm going to let the tank run out and replace it with 98. If the problem should stop, then I will have to assume it's 95 that's a problem.

 

[Roymondo]

Tried it on my F800ST and got improved fuel economy

Which is slightly odd as, unlike the K1300 and twin cam boxers, the F800 is not able to adjust itself to take advantage of 97/98 RON petrol.

 

[grimo]

Who cares what goes in the tank as long as you enjoy riding the thing that's all that matters.

 

[onlychild]

Who cares what goes in the tank as long as you enjoy riding the thing that's all that matters.

Would agree with you if riding it WAS a pleasure. When it cuts out whilst your filtering across busy roundabouts or between lorries, it is important to find out if what's in the tank is causing the problem..no?

 

[cookie]

Would agree with you if riding it WAS a pleasure. When it cuts out whilst your filtering across busy roundabouts or between lorries, it is important to find out if what's in the tank is causing the problem..no?

95 octane fuel would not cause your problem, at least not on it's own. it's hard to see how it could even be a contributing factor.

if it was the cause, all other similar models would exhibit the same issues, but they don't.

 

[onlychild]

95 octane fuel would not cause your problem, at least not on it's own. it's hard to see how it could even be a contributing factor.

if it was the cause, all other similar models would exhibit the same issues, but they don't.

Yes I agree with you entirely. However, the bike runs perfect on 98 and now I've put in 95 its awful. I've also been told by an independent dealer that I should ONLY be putting 98 in it, so you can't blame me for wondering if it's a factor?

If you've got any other guesses as to what it could be (stick coils?), then please let me hear it!

 

[cookie]

it sounds like the knock sensors & ECU correctly detect the 95 RON then screw up the fuelling map for it

your independent dealer who claims you should only use 98, should know better.

 

[onlychild]

Ok, I was starting to doubt him anyway.
I'll put it to BMW Cooper Tunbridge Wells and see what they say?

 

[bod]

Yes I agree with you entirely. However, the bike runs perfect on 98 and now I've put in 95 its awful. I've also been told by an independent dealer that I should ONLY be putting 98 in it, so you can't blame me for wondering if it's a factor?

If you've got any other guesses as to what it could be (stick coils?), then please let me hear it!

Hang on, hav'nt we done this before?

BMW say super unleaded, but on a global scale 95 ron is super unleaded.
Will also accept the shite offered in the shite holes of this world (91 ron)

As for myself, I think it's all a load of bollox!

Also tried top end diesel in my 2 litre TDI and noticed no difference at all.

I drive past the refinery at Kingsbury & see tankers of all brands lined up for the same stuff

I tell yer, it's all between the ears!

 

[original_concept]

The answer is in, and the back of, the latest TC manual,which you can find on the BMW Motorrad website.

Or basically, 95 ok, 98 better.

 

[onlychild]

The answer is in, and the back of, the latest TC manual,which you can find on the BMW Motorrad website.

Or basically, 95 ok, 98 better.

Sounds right to me!
Jeff from hillside told me that basically the GS can run on pigs piss and it should handle it.
If they do pig piss for 30p a litre then it's going in!!!