Octane number update information - 1-3=increment/4-5=no change/6=decrement
Aug 31, 2006, 04:26 AM
#34
Evolving Member
iTrader: (1)
Join Date: Nov 2005
Location: Florida
Posts: 312
Likes: 0
Received 0 Likes
on
0 Posts
by the way on the IX which map is the main ignition map and what do the other 2 do i noticed it has three ignition maps ign 1,2 and 3 lo and hi octaine. Can you share this information with me please
Oct 5, 2006, 04:08 PM
#38
Newbie
Join Date: Mar 2004
Location: Seattle, WA USA
Posts: 53
Likes: 0
Received 0 Likes
on
0 Posts
The octane number recovery also seems to have a load component in addition to the timer. I was logging a friend's car and watching the octane number head toward 250 or so as usual with his tune. Then we drove around with light load and waited for it to creep back up to 255 - which it did. Then, we 'knocked' it back down to 250 and got out of the gas again for a while. It didn't come back up at all after a few miles of light driving. Surprisingly, when he got back into the gas hard, it immediately shot up to 254 over a couple of seconds.
We repeated this a few times. Getting completely out of the gas and then loading it pretty heavy (but not to the point of knock) made the octane number recover faster (in fact, immediately) than waiting for the timer. Interesting.
We repeated this a few times. Getting completely out of the gas and then loading it pretty heavy (but not to the point of knock) made the octane number recover faster (in fact, immediately) than waiting for the timer. Interesting.
Oct 6, 2006, 01:48 AM
#39
Evolved Member
Thread Starter
I saw this too, and the code supports the behaviour. The knock control and the octane control are both constrained by limits such as load, RPM, coolant as you say. It won't show knock sum or adjust octane unless there is some load on the motor.
Oct 7, 2006, 12:16 AM
#40
Evolving Member
iTrader: (8)
Join Date: Jul 2006
Location: Silicon Valley
Posts: 179
Likes: 0
Received 0 Likes
on
0 Posts
how are the initial octane numbers calculated and stored?
tuned a vehicle the past week where even after a battery reset, its previous octane value (in this case around 74%) was still prevalent. my friend and i speculated that somehow someone erroneously placed in 89oct gas or so, thus the ecu "set" this value intially after a start. Either this or maybe that this value is stored in long term flash memory.
tuned a vehicle the past week where even after a battery reset, its previous octane value (in this case around 74%) was still prevalent. my friend and i speculated that somehow someone erroneously placed in 89oct gas or so, thus the ecu "set" this value intially after a start. Either this or maybe that this value is stored in long term flash memory.
Thread
Thread Starter
Forum
Replies
Last Post
