I'm curious why you never had a response. I'm going to check into the torque readings myself this summer with different octanes and ethenol or not.
Torque app & octane & timing question
Hi everyone. Long time lurker, happy '12 Eco owner on the East Coast of Canada. 
I've read so much about octane it makes me jittery. This is not one of those "WHICH OCTANE IS THE BEST" type questions, more of a curiosity thing. I've decided with the cooler weather to drop down to 89, check out the timing with the torque app and then maybe drop down to 87 when it gets really cold.
I do the same highway route, same speed, regularly. When I used the torque app to watch the timing (running 91) while in 6th pulling up some grades (~115km/hr) the timing, according to the torque app, will go down to 1, .5, 0 and sometimes to -.5, -1 for a split second. I'm assuming that's when the knock sensors are doing their thing when it reads negative? I'm not lugging the engine and maintaining speed just fine at this point. Boost is reading 8-9PSI. These grades last for 15-20 seconds, so nothing huge.
Since I've been running 89, going up those same grades, the timing never goes into the negatives. Does this mean the ECU might be running on the 87 map now (I thought I read somewhere there is a map for 87 and 91..), and isn't pulling the timing back?
I'm not noticing any fuel mileage problems with 89, and the power still seems to be there, but was only curious to see why the timing isn't being pulled on 89. Perhaps it's just the cooler weather helping out?
Thanks!
I've read so much about octane it makes me jittery. This is not one of those "WHICH OCTANE IS THE BEST" type questions, more of a curiosity thing. I've decided with the cooler weather to drop down to 89, check out the timing with the torque app and then maybe drop down to 87 when it gets really cold.
I do the same highway route, same speed, regularly. When I used the torque app to watch the timing (running 91) while in 6th pulling up some grades (~115km/hr) the timing, according to the torque app, will go down to 1, .5, 0 and sometimes to -.5, -1 for a split second. I'm assuming that's when the knock sensors are doing their thing when it reads negative? I'm not lugging the engine and maintaining speed just fine at this point. Boost is reading 8-9PSI. These grades last for 15-20 seconds, so nothing huge.
Since I've been running 89, going up those same grades, the timing never goes into the negatives. Does this mean the ECU might be running on the 87 map now (I thought I read somewhere there is a map for 87 and 91..), and isn't pulling the timing back?
I'm not noticing any fuel mileage problems with 89, and the power still seems to be there, but was only curious to see why the timing isn't being pulled on 89. Perhaps it's just the cooler weather helping out?
Thanks!
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