OAR

[tmcphail]

Hi Torrie,

I saw that OAR is adjustable in the tune.

Would it be possible to increase the min/max so we would be able to see poorer/higher octane conditions than stock?

Knowing that -1 is 93 and 1 is 87 we would be able to calculate octane above and below those levels if it is possible without messing up the knock strategy.

The oar is not "adjustable."

While you can set the min and max values which would allow you to force one particular value, that would be all you could do.  If you still had somewhat of a range, the pcm does calculations via other parameters that would dictate the final oar value within that range.  It is also not a proven fact that -1 is 93 octane and 1 is 87 octane.  I have also never seen anyone do this.

[Scott4957]

The oar is not "adjustable.”

While you can set the min and max values which would allow you to force one particular value, that would be all you could do.  If you still had somewhat of a range, the pcm does calculations via other parameters that would dictate the final oar value within that range.  It is also not a proven fact that -1 is 93 octane and 1 is 87 octane.  I have also never seen anyone do this.

So you could set the range from -3 to 3, or force -1 by saying from -1 to -1. If we go with the former, even though we can't correlate a value with an octane rating, it would in fact show a value of say -2 when running race gas as opposed to say a 1 when running 87. With -1 being the limit we are unable to compare 93 that MAY be hitting that limit to an E mix or race gas mix, ACES, meth etc. If this is the case is there any value in this? Being able to see this live in Torque or as an average might be able to give the driver a heads up on other issues like a bad mix, E mix not hitting both tanks, meth not working properly?

Thanks,
Scott

[tmcphail]

Theoretically maybe. I have not altered it on this controller yet. I know someone tested forcing it to -1 on a focus ST and that netted no change.

[FoMoCoSHO]

IIRC, the range was minus one to plus one when I saw the table.

I like to take baby steps when messing around with unknowns so I was thinking of widening the range to -1.25 to +1.25 and see what happens in the logs. Actually even -1.05 to +1.05 should tell us if we are on to something. I would actually be more comfortable with the smaller value since knock and timing tables are involved along with multipliers. I know that the car had 87 when I bought it and OAR was +1.....93 moved it to -1 and I should be in a happier octane place with the blend and ACES mix. Both SHO's  pegged at -1 with the blend and never move while some experience fluctuation on straight 93.

It occurred to me that there may be no change since there could be other unseen parameters keeping it in the stock setting range.

I'd be happy to be the test mule