OAR

[FoMoCoSHO]

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.

 

[Scott4957]

 

[Scott4957]

On a serious note I have also thought about this and could find nothing saying it could be adjusted, it appears to be a fixed range. From what I have read it seems all the sensors it uses to determine OAR would be applicable with E85 or race gas for that matter so it really could show an improvement say over 93 when mixing.

 

[ajpturbo]

Scott it can be adjusted...im not surprised much that you couldnt find anything on it...only people with software would onow that its an adjustable scalar

 

[askoncemore]

I am interested in this as well.

 

[Scott4957]

Scott it can be adjusted...im not surprised much that you couldnt find anything on it...only people with software would onow that its an adjustable scalar

I was looking in forums for people who have adjusted this, not in software. So how does this work then? You allow it to scale between -2 and +2 for example and based on the knock sensor and timing advance it will show a setup running E85 or meth as being higher octane with a -2 vs a tank of 93 showing as -1? I'm sure I'm simplifying it but is that the general idea?

 

[ajpturbo]

Im not exactly sure how the scaling works but id like to see how people are adjusting an item in the tune without tune editing software

 

[FoMoCoSHO]

Scott it can be adjusted...im not surprised much that you couldnt find anything on it...only people with software would onow that its an adjustable scalar

I was looking in forums for people who have adjusted this, not in software. So how does this work then? You allow it to scale between -2 and +2 for example and based on the knock sensor and timing advance it will show a setup running E85 or meth as being higher octane with a -2 vs a tank of 93 showing as -1? I'm sure I'm simplifying it but is that the general idea?

Yes. My concern is the effect this could have on the knock strategy. Unintended consequences and all that.

 

[Scott4957]

Im not exactly sure how the scaling works but id like to see how people are adjusting an item in the tune without tune editing software

You are getting confused. I was looking for people who were adjusting this in software. I was not looking in the software as I don't have it. Guess we won't know how it works until someone tries it, any takers?

 

[FoMoCoSHO]

Im not exactly sure how the scaling works but id like to see how people are adjusting an item in the tune without tune editing software

You are getting confused. I was looking for people who were adjusting this in software. I was not looking in the software as I don't have it. Guess we won't know how it works until someone tries it, any takers?

AJP has yet to succumb to the power of the corn.

We will have to wait for Torrie's response.

If it is feasible I will gladly be the sucker, er I mean, guinea pig.

 

[ajpturbo]

I think if you change the values in the tune it will change the limits of how much scaling can take place

 

[FoMoCoSHO]

Yes but i do like the female corn hole if that counts...

I think if you change the values in the tune it will change the limits of how much scaling can take place

Ha, at least you specified this time, Cornholio

 

[ZSHO]

Yes but i do like the female corn hole if that counts...

I think if you change the values in the tune it will change the limits of how much scaling can take place

Ha, at least you specified this time, Cornholio

Naughty,naughty.LOL  Z

 

[ajpturbo]

Z you have been dying to edit me havent you??....was it nessasary?

 

[SHOdded]

Yes AJ, it was necessary, and you know it.

 

[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