Shell Optimax - Suzuki GSX-R Motorcycle Forums Gixxer.com
 
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post #1 of 6 (permalink) Old 04-11-2004, 05:48 PM Thread Starter
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Shell Optimax

anyone tried this or run it in their bike?

does it make any noticable difference?
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post #2 of 6 (permalink) Old 04-12-2004, 02:08 AM
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Re: Shell Optimax

I swear by it for the car (designed to run on Japanese 100 RON super unleaded) so I tried it in my 97 600 and it made no diff. I reckon it'd work well on an remapped injected bike running more ignition advance, but bike management systems aren't sophisticted enough to take advantage of the higher octane by themselves unlike modern cars.
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post #3 of 6 (permalink) Old 04-12-2004, 05:50 AM Thread Starter
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Re: Shell Optimax

I tried it in my car (Ford Escort) but it made no difference.
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post #4 of 6 (permalink) Old 04-12-2004, 06:43 AM
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Re: Shell Optimax

It benefits older cars etc that were designed for leaded petrol high octane ratings. I use it in my car and get slightly better economy/performance. I used to put super unleaded in my SRAD and it certainly ran better. I always use this or BP ultimate as I have read a lot about the cheaper petrols being crap. It should really make no difference in a new bike. Go to Germany and get 100 octane stuff!
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post #5 of 6 (permalink) Old 04-12-2004, 08:42 AM
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Re: Shell Optimax

Quote:
webbie said:
I tried it in my car (Ford Escort) but it made no difference.
Some cars like it, some don't. My old Lexus felt no different running on "ASDA" or Optimax

The WRX though runs like shit on anything other than Optimax, even BP Ultimate runs crap compared to the Shell, but then my car is mapped for Opti.

The newer the car, the more likely it is to be able to take advantage of it.

A common misconception is that higher octane fuel = more power which isn't the case, the calorific value governs power and it's pretty similar between normal unleaded and super unleaded.

The advantage of higher octane fuel is its knock resistance allowing you to run higher cylinder temps and/or pressures with more ignition advance so you can either up the compression ratio, increase the boost or increase ignition advance or a combination of all 3. This is where the extra power comes from.

With a normally aspirated engine, the only change you can make during normal running is ignition advance (and you could probably run a little leaner, too), but only if the ECU has reasonable knock correction (which bike ECU's don't currently have).
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post #6 of 6 (permalink) Old 04-13-2004, 02:40 PM
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Re: Shell Optimax

nah no difference with my bike, non whatsoever but then again performance is never that cheap................ a balance of the carbs and a clean air filter is 100 times more beneficial...........

Andy
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