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  #41  
Old 18.10.2010, 17:47
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Re: BMW wow...

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Have any of you BMW fans found the indicator switch yet? I believe it is very well hidden on these Teutonic cars.....
What indicator switch are you referring, precisely?
Thanks.
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  #42  
Old 29.04.2011, 00:15
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Re: BMW wow...

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Agree; BMW X1 is another pointless vehicle; does no more than a BMW Series 1 saloon (don't like those either) but uses more fuel and doesn't handle as well.
Can`t wait till I get My BMW528e 1988 from California
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  #43  
Old 29.04.2011, 00:28
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Re: BMW wow...

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I have only had one additive confirmed as being actually different. That one unique additive is Techron, which is manufactured and marketed by Cheveron. It does help keep your injectors clean as well as your fuel system. However my mechanic commented that like many other additives that actually clean that you might need to change your fuel filter after a strong dose.

As far as RON ratings and what they do I had a BMW 330xiT and an Audi A4 2.0, which used 98 and 95 respectively, as per manufacturers suggestion.
When I put the lower RON fuel in the BMW I had less power and worse fuel economy.
Alternatively, when I would accidentally put the higher RON fuel in the Audi it just cost more. I didn't get better mileage or more power.

Ironically, sometimes the better throttle response would "encourage" me to drive in a more aggressive manner which of course would negate any fuel economy improvements that might have been possible.

This is the real reason I get better mileage when I can use the cruise control.
Higher octane numbers mean less succeptability to detonation, BUT they also mean less energy per unit volume (not much, but it is less)! Higher octane fuel burns slower, and contains less calories/unit.

So, unless your engine is designed to need higher octane, you will not get more power by using higher octane fuel, in fact you will get LESS (and worse fuel economy).

Tom
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  #44  
Old 29.04.2011, 00:40
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Re: BMW wow...

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Higher octane numbers mean less succeptability to detonation, BUT they also mean less energy per unit volume (not much, but it is less)! Higher octane fuel burns slower, and contains less calories/unit.

So, unless your engine is designed to need higher octane, you will not get more power by using higher octane fuel, in fact you will get LESS (and worse fuel economy).

Tom
That is true and a very good point.

I used to drive a Volvo Turbo that needed high octane fuel or it would detonate. In the summer when we would go on vacation I would carry a tool kit with a timing light so that I could change the timing when I could not find the right grade of fuel.

Now all of my cars retard their timing on their own.
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  #45  
Old 29.04.2011, 00:50
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Re: BMW wow...

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Higher octane numbers mean less succeptability to detonation, BUT they also mean less energy per unit volume (not much, but it is less)! Higher octane fuel burns slower, and contains less calories/unit.

So, unless your engine is designed to need higher octane, you will not get more power by using higher octane fuel, in fact you will get LESS (and worse fuel economy).

Tom
What do you mean "detonate"?
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  #46  
Old 29.04.2011, 01:00
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Re: BMW wow...

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Higher octane numbers mean less succeptability to detonation, BUT they also mean less energy per unit volume (not much, but it is less)! Higher octane fuel burns slower, and contains less calories/unit.

So, unless your engine is designed to need higher octane, you will not get more power by using higher octane fuel, in fact you will get LESS (and worse fuel economy).

Tom
Sorry, you have that back to front.

Higher Octane ("RON") meass less propensity to pre-ignition or or knock, the fuel is burnt more efficiently, and quicker. I do not understand what you mean by "less succeptability to detonation"... Higher Octane fuels , when adjusted for by the ECU, means better fuel consumption (more burn per liter) and better fuel consumption (less waste per litre). Higher Octane fuels alongside an efficient ECU mean more power and less consumption.

Higher octane fuels have a better ROI than lower Octane fuels wrt economy and power.

Perhaps by detonation, you mean "knock" or "pre" detonation. Any fuel with less succeptability to detonation may was well be water... Fuel by nature is highly succeptable to detonation...
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  #47  
Old 29.04.2011, 02:07
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Re: BMW wow...

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Sorry, you have that back to front.

Higher Octane ("RON") meass less propensity to pre-ignition or or knock, the fuel is burnt more efficiently, and quicker. I do not understand what you mean by "less succeptability to detonation"... Higher Octane fuels , when adjusted for by the ECU, means better fuel consumption (more burn per liter) and better fuel consumption (less waste per litre). Higher Octane fuels alongside an efficient ECU mean more power and less consumption.

Higher octane fuels have a better ROI than lower Octane fuels wrt economy and power.

Perhaps by detonation, you mean "knock" or "pre" detonation. Any fuel with less succeptability to detonation may was well be water... Fuel by nature is highly succeptable to detonation...
Yes, this is how I understood all of this, though I'm no engineer.
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  #48  
Old 29.04.2011, 03:28
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Re: BMW wow...

mine calls for it but also takes 95.....performance is the exact same to me....economy is just a tad bit less....but with a 4.2L V8 i could care less, didnt buy it for economy, bought it for fun..... and every time I hit the gas I and and

as for your wait time, my rents waited 1.2 years for their Merc G class to finally arrive....in the end it is worth the wait for what you really want
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  #49  
Old 29.04.2011, 09:25
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Re: BMW wow...

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Sorry, you have that back to front.

Higher Octane ("RON") meass less propensity to pre-ignition or or knock, ...I do not understand what you mean by "less succeptability to detonation"
The exact same thing you said.

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the fuel is burnt more efficiently, and quicker.
That is wrong. Higher octane fuel burns SLOWER.

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Higher Octane fuels alongside an efficient ECU mean more power and less consumption.
If the motor itself has a higher CR to make use of the higher octane, then yes, if not then no. Also no if the engine doesn't have knock sensors, which is the case with older cars and most (if not all) motorcycles, all of which will have the best power and economy using the LOWEST octane fuel that doesn't detonate (ping, if you prefer, but 'ping' is actually the result of detonation, and not detonation itself)

Tom
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  #50  
Old 29.04.2011, 10:12
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Re: BMW wow...

I always thought it was called "pinking" not ping, and that is when your valves are banging against their seats under a load.
Used to happen on my old 1980 mini city till I sorted out the timing.
I have noticed that if I put 98Ron in my Guzzi bike then the pinking also disappears under a load, and this is a simple two valve head. It has been noticed on a lot of forums that this is the case as well..... so 98Ron is better than 95 for performance.
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  #51  
Old 29.04.2011, 10:24
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Re: BMW wow...

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I have noticed that if I put 98Ron in my Guzzi bike then the pinking also disappears under a load, and this is a simple two valve head. It has been noticed on a lot of forums that this is the case as well..... so 98Ron is better than 95 for performance.
If you have 'pinking' under load, then you are using the wrong octane.

My Guzzi never 'pinks' under load with 95, and runs better than with 98 or 100, as is the case with my Ducatis. Only my other Guzzi, also a LeMans but with a sidecar, requires 98, and even then only in summer.

Tom
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  #52  
Old 29.04.2011, 10:28
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Re: BMW wow...

The Roadster pinks with bad quality 98! Filled up with 98 at an Intermarche and it began pinking very badly under load.

Next stop was for V-Power and that sorted the problem.

The only downside of a high specific output N/A engine!!! The Passat also needs 98 - I haven't tried it on 95 though to see what happens
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  #53  
Old 29.04.2011, 18:35
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Re: BMW wow...

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If you have 'pinking' under load, then you are using the wrong octane.

Tom
Ran this prob past two different experienced Guzzi mechanics and they suggested the 98 route, perhaps the modern fuel injection system adjusts it, also found that it runs better with the 98 and further.

This always reminds me of a Jaguar mechanic I once knew who solved a clients poor running problem by telling him to stick in 98 and not the supermarket crap, after 3 fill ups problem was solved, something to do with the cleaning properties of the 98 ron and the sludge in the supermarket 95.
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  #54  
Old 01.05.2011, 16:43
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Re: BMW wow...

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Ran this prob past two different experienced Guzzi mechanics and they suggested the 98 route, perhaps the modern fuel injection system adjusts it, also found that it runs better with the 98 and further.

This always reminds me of a Jaguar mechanic I once knew who solved a clients poor running problem by telling him to stick in 98 and not the supermarket crap, after 3 fill ups problem was solved, something to do with the cleaning properties of the 98 ron and the sludge in the supermarket 95.
I used to be running bimmer's six cylinder engine on premium 98 RON for a while then I switched to regular 95 RON about six months ago. Do not see any significant difference in terms of performence there. If it is true (sludge part) then the time will show. However the manual only says not to use fuel grades lower than 91RON.

Especially, to me it is a CHF216 annual saving between e.g. CHF1.72 (95) and CHF1.87 (98) if you are talking about 60 litres tank filled twice a month.

BTW: Yes you can still find some automated filling stations CHF1.72 per litre on the outskirts in Aargau. Most of them show CHF1.77 - CHF1.78 though.
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  #55  
Old 01.05.2011, 18:10
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Re: BMW wow...

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Ran this prob past two different experienced Guzzi mechanics and they suggested the 98 route, perhaps the modern fuel injection system adjusts it, also found that it runs better with the 98 and further.
I bought my LeMans new in 1985, and have 93k miles on it (yes, miles, as I bought it in the US a year before moving here), and 115k km on my other LeMans, both are air-cooled carb bikes.

Perhaps your squish isn't correct.

Tom
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