BP Ultimate means engine quicker warm-up?

[jkuchta]

The Octane rating of the fuel has nothing to do with flame front speeds....in other words regular and premium fuels take the same amount of time to burn.

As far as our car's ability to "sense" the type of fuel in order to advance timing...that's not how it works. The ECU runs the most advanced timing it can, and retards when detonation is detected. The manual says the car can run on regular, not that it was designed to run on regular. Barring any information as to the specifics from Toyota about how aggressive the timing was programmed to get, and taking into account the fact that the 1NZ runs a pretty high compression ratio of 10.5:1, I would posit that the ECU has the capability to retard timing to run on regular, rather than no ability to take advantage of premium.
I would also through out the idea that running regular gas in hot/dry climates may be running the ECU pretty close to it's limit of compensation. I say this because LtNoogie basically couldn't run his new supercharger in pretty cool/wet conditions under any kind of load without getting detonation on regular gas. The Blitz kit is only putting out around a half a bar of pressure, which, if the ECU was programmed specifically for regular gas, should not max out the ECU's ability to adjust the timing to that extent. If he was able to run O.K. on regular (detonation only under extreme load/high ambient temps.), then I would be a little more receptive to the idea that the car was designed to run specifically on regular.

The bottom line for me is this:

Will the car run fine on regular? Yes it will.

Will the engine be producing its maximum performance on regular? No. Detonation will cause the ECU to retard timing, thus keeping the engine from seeing the most advanced timing that it can.

If anyone has any hard data from Toyota concerning the ignition and anti-knock programming for the ECU I would really appreciate it.

Also, if anyone with a scangauge running regular could post some data about their ignition timing vs. load and intake temp that would be really cool. I’ve posted my data here: http://www.yarisworld.com/forums/sho...2&postcount=14

[ROCKLAND TOYOTA]

Originally Posted by jkuchta

The Octane rating of the fuel has nothing to do with flame front speeds....in other words regular and premium fuels take the same amount of time to burn.

As far as our car's ability to "sense" the type of fuel in order to advance timing...that's not how it works. The ECU runs the most advanced timing it can, and retards when detonation is detected. The manual says the car can run on regular, not that it was designed to run on regular. Barring any information as to the specifics from Toyota about how aggressive the timing was programmed to get, and taking into account the fact that the 1NZ runs a pretty high compression ratio of 10.5:1, I would posit that the ECU has the capability to retard timing to run on regular, rather than no ability to take advantage of premium.
I would also through out the idea that running regular gas in hot/dry climates may be running the ECU pretty close to it's limit of compensation. I say this because LtNoogie basically couldn't run his new supercharger in pretty cool/wet conditions under any kind of load without getting detonation on regular gas. The Blitz kit is only putting out around a half a bar of pressure, which, if the ECU was programmed specifically for regular gas, should not max out the ECU's ability to adjust the timing to that extent. If he was able to run O.K. on regular (detonation only under extreme load/high ambient temps.), then I would be a little more receptive to the idea that the car was designed to run specifically on regular.

The bottom line for me is this:

Will the car run fine on regular? Yes it will.

Will the engine be producing its maximum performance on regular? No. Detonation will cause the ECU to retard timing, thus keeping the engine from seeing the most advanced timing that it can.

If anyone has any hard data from Toyota concerning the ignition and anti-knock programming for the ECU I would really appreciate it.

Also, if anyone with a scangauge running regular could post some data about their ignition timing vs. load and intake temp that would be really cool. I’ve posted my data here: http://www.yarisworld.com/forums/sho...2&postcount=14

[jambo101]

Keep reading http://www.baileycar.com/gasoline_html.html

Bit long but the jist is=
Our tests confirm that for most cars there is no compelling reason to buy more expensive fuel than the
factory recommends, as any performance gain realized will surely be far less than the percentage hike in
price.

[ROCKLAND TOYOTA]

Originally Posted by jambo101

Keep reading http://www.baileycar.com/gasoline_html.html

Bit long but the jist is=
Our tests confirm that for most cars there is no compelling reason to buy more expensive fuel than the
factory recommends, as any performance gain realized will surely be far less than the percentage hike in
price.

right now percentage hike is what 5 cents.........

[b_hickman11]

Originally Posted by ROCKLAND TOYOTA

right now percentage hike is what 5 cents.........

Still not worth it

[jambo101]

10 cents a liter difference here in Montreal,but even if it was the same price i'd use the octane rating my owners manual recommends.

[rob323]

Originally Posted by jambo101

Bit long but the jist is=
Our tests confirm that for most cars there is no compelling reason to buy more expensive fuel than the
factory recommends, as any performance gain realized will surely be far less than the percentage hike in
price.

There are more reasons to run higher octane fuels other than just for performance gains (which I agree that unless the engine is tuned for, are insignificant), such as smoother revving, better economy, increased knock suppression and better cleaning properties in some brands of higher than normal octane fuel.

[jambo101]

Originally Posted by rob323

There are more reasons to run higher octane fuels other than just for performance gains (which I agree that unless the engine is tuned for, are insignificant), such as smoother revving, better economy, increased knock suppression and better cleaning properties in some brands of higher than normal octane fuel.

Agreed, but those reasons dont apply to the Yaris as its designed to run on regular gas.

[rob323]

Originally Posted by jambo101

Agreed, but those reasons dont apply to the Yaris as its designed to run on regular gas.

Your Yaris may be tuned to run on regular gas (mass produced engines aren't designed for a specific fuel octane rating, they are tuned for it) but the Yaris will still benefit from the same advantages of higher octane fuel that I mentioned previously.

Does the dealer over there recommend you pay an additional cost to put injector cleaner through the car at service time?

[jambo101]

Originally Posted by rob323

Does the dealer over there recommend you pay an additional cost to put injector cleaner through the car at service time?

My dealer hasnt mentioned it yet,a service i would decline due to the fact that injector cleaner is already formulated into the gas and my 2001 Echo has never had injector cleaner and is running fine at over 200k so i dont see the need for it in the Yaris.
Our higher octane gas is usually 10 cents a liter more than regular,that would equate to a 40 cent a gallon extra for higher octane fuel,kinda defeats the purpose of buying an economy car if you have to pay an extra 40 cents per gallon when you dont have to.