07-08-2013, 01:52 AM
(07-07-2013, 11:47 PM)_imp Wrote:(07-07-2013, 01:45 PM)Gypped_imp Wrote:(07-07-2013, 12:33 PM)Deanohh_imp Wrote:(07-07-2013, 11:39 AM)_imp Wrote: I read in the Aussie manual that 91 was required, so that is why I was using it. Then read in the US manual 86+ was OK.
Funny but the FZ8 also is fine on 87 according to the manual.
Aussie might be one of the countries that use a different scale for their gas numbers.
Aussie might be one of the countries that use a different scale for their gas numbers.
They do, they use the European system of octane rating. Their 91 is our 87. Using a higher octane fuel than is required for a stock engine will do absolutely nothing for you besides cost more money. As mentioned, if you want to pay more, find 100% gasoline and use that, you will actually get better performance that way (only about 3-4%, but it's also better for the engine). If your fuel says "may contain up to 10% ethanol", you can bet it has 10% ethanol in it.
This is one of those internet arguments that happens constantly and consistently, with everyone going round and round on it.
Aussie might be one of the countries that use a different scale for their gas numbers.
They do, they use the European system of octane rating. Their 91 is our 87. Using a higher octane fuel than is required for a stock engine will do absolutely nothing for you besides cost more money. As mentioned, if you want to pay more, find 100% gasoline and use that, you will actually get better performance that way (only about 3-4%, but it's also better for the engine). If your fuel says "may contain up to 10% ethanol", you can bet it has 10% ethanol in it.
This is one of those internet arguments that happens constantly and consistently, with everyone going round and round on it. This is exactly correct with respect to the Aussie/UK octane rating but not entirely accurate with respect to being able to get more out of the higher octane. Some engines have built-in knock sensors and can automatically adjust ignition timing to take advantage of the higher rating. My FJ Cruiser is one of them but there are many others. The documentation from Toyota specifies this. Since Honda didn't tell us about the speed limiter it's possible that other features are built in that we wouldn't know about either.
Aussie might be one of the countries that use a different scale for their gas numbers.
They do, they use the European system of octane rating. Their 91 is our 87. Using a higher octane fuel than is required for a stock engine will do absolutely nothing for you besides cost more money. As mentioned, if you want to pay more, find 100% gasoline and use that, you will actually get better performance that way (only about 3-4%, but it's also better for the engine). If your fuel says "may contain up to 10% ethanol", you can bet it has 10% ethanol in it.
This is one of those internet arguments that happens constantly and consistently, with everyone going round and round on it. This is exactly correct with respect to the Aussie/UK octane rating but not entirely accurate with respect to being able to get more out of the higher octane. Some engines have built-in knock sensors and can automatically adjust ignition timing to take advantage of the higher rating. My FJ Cruiser is one of them but there are many others. The documentation from Toyota specifies this. Since Honda didn't tell us about the speed limiter it's possible that other features are built in that we wouldn't know about either.
That's not how the knock sensor works... your FJ Cruiser engine is designed for 91 octane and that's when you get the most power. The anti-knock sensor *lets* you use lower octane. You aren't unlocking "hidden" power by using higher octane gas, you're just using what you're supposed to be.
Here's the test: Go and get race fuel, then have it dyno'd.
I am willing to bet that it will *not* increase your horsepower. I will make this offer to anyone here in the South, actually: If you go and do 3 runs using 87, 91, and 95+ octane fuel with a stock vehicle, I will meet you for the runs. If the dyno shows a larger increase than standard margin of error on race fuel, I will pay for the runs and buy you a 12-pack. If it doesn't, you pay for the runs and a 12-pack.
Using higher octane gas than your engine is DESIGNED TO USE, will not gain you a single thing but a higher bill at the pump.