Experimenting with Octane Adjust Ratio (LOR) settings in SCT

[FoMoCoSHO]

Note: when mixing in Ethanol into a tune that already taxes the fuel system be prepared for lower than expected Fuel Pressure.... wowza!!! 850psi.... a bit further away from the normal dips I see lol...

Uhhhh, how much did you put in?

That's about than half of what I'm getting!

2.5 Gallons..

Mind you... my current tune doesn't account for any E l, still .80 lambse.

Well, you need that changed to .85 ASAP!

I sent you a present to help you calculate your correct stoich setting.

 

[FoMoCoSHO]

I do 5.75-6 gallons at fillup depending on tank level.

 

[FoMoCoSHO]

Have I mentioned I get almost 27 degrees of spark advance?

This thing pulls hard everywhere...

Punch it at 80 and it will jerk the wheel....

Even with the OEM paper filter, lol.

 

[StealBlueSHO]

........ I get 20.5 degrees advance on 93 alone... at 14.5psi...

Although how much boost are you targeting? Makes a difference in spark...

I'm already talking to Brad about updating my tune to account for the added corn.

 

[FoMoCoSHO]

........ I get 20.5 degrees advance on 93 alone... at 14.5psi...

Although how much boost are you targeting? Makes a difference in spark...

I'm already talking to Brad about updating my tune to account for the added corn.

15, as the temps improve I might start moving toward 17 but i dunno....more boost equals more IAT2 heat.

There is a huge difference in how the car feels between 20 and 27....It's made me a spark junkie and Brad is my dealer.

 

[StealBlueSHO]

........ I get 20.5 degrees advance on 93 alone... at 14.5psi...

Although how much boost are you targeting? Makes a difference in spark...

I'm already talking to Brad about updating my tune to account for the added corn.

15, as the temps improve I might start moving toward 17 but i dunno....more boost equals more IAT2 heat.

There is a huge difference in how the car feels between 20 and 27....It's made me a spark junkie and Brad is my dealer.

I have seen a lot of datalogs... the 13+ SHO's must have better logic to assist in fuel pressure... I see 13+s hitting 2400 psi at the rail, sometimes more, and mine never goes above 2250psi...like most 2010-2012's

The rail pressure curves are very different!

Makes me a sad panda because ambient temps really play havoc on my fuel pressure...

 

[FoMoCoSHO]

........ I get 20.5 degrees advance on 93 alone... at 14.5psi...

Although how much boost are you targeting? Makes a difference in spark...

I'm already talking to Brad about updating my tune to account for the added corn.

15, as the temps improve I might start moving toward 17 but i dunno....more boost equals more IAT2 heat.

There is a huge difference in how the car feels between 20 and 27....It's made me a spark junkie and Brad is my dealer.

I have seen a lot of datalogs... the 13+ SHO's must have better logic to assist in fuel pressure... I see 13+s hitting 2400 psi at the rail, sometimes more, and mine never goes above 2250psi...like most 2010-2012's

The rail pressure curves are very different!

Makes me a sad panda because ambient temps really play havoc on my fuel pressure...

You might want to have him rescale your OAR as well.

 

[StealBlueSHO]

........ I get 20.5 degrees advance on 93 alone... at 14.5psi...

Although how much boost are you targeting? Makes a difference in spark...

I'm already talking to Brad about updating my tune to account for the added corn.

15, as the temps improve I might start moving toward 17 but i dunno....more boost equals more IAT2 heat.

There is a huge difference in how the car feels between 20 and 27....It's made me a spark junkie and Brad is my dealer.

I have seen a lot of datalogs... the 13+ SHO's must have better logic to assist in fuel pressure... I see 13+s hitting 2400 psi at the rail, sometimes more, and mine never goes above 2250psi...like most 2010-2012's

The rail pressure curves are very different!

Makes me a sad panda because ambient temps really play havoc on my fuel pressure...

You might want to have him rescale your OAR as well.

Why the need to rescale OAR? I admittedly don't know enough about the scaling of OAR, haven't really compared the spark at different OAR's...

But in theory, it scales based on input from the knock sensor, not sure why you would need to rescale it for the added octane of E85?

 

[FoMoCoSHO]

@ SBS

http://www.cobbtuning.com/ford-ecoboost-and-the-octane-adjust-ratio-monitor/

 

[FoMoCoSHO]

I think it adds a layer of safety when running very high octane beyond the limits of -1....

Basically it gives you resolution beyond -1... With power so far beyond -1, I think that's a good thing. You will never know there is a fuel issue with corn at -1.....-1.2 will tell you if you effed up your blend or got a tank of less that perfect gas or corn.

Part throttle response is improved as well IMHO I'd suspect due to spark advance.

 

[FoMoCoSHO]

I would like to scale it farther as I think it would be a great tool to really compare what blends tolerate different OARS but for some reason (Brad told me and I don't remember) that -1.2 is max.

I'm still pegged at -1.2 (-1.15 in SCT) but I did have an event which scaled my OAR back a while ago.

 

[FoMoCoSHO]

Whoever split that off, thanks!

I had to walk AFK for a bit.

 

[FoMoCoSHO]

SBS, I will be watching closely how this develops for you.

Your results will have an impact on what we decide to do vehicle wise next year.

 

[StealBlueSHO]

SBS, I will be watching closely how this develops for you.

Your results will have an impact on what we decide to do vehicle wise next year.

Yea, we will see... I'm curious how well my car will respond.. I know keeping the lambse at .80 with an E20ish mix coupled with the cooler ambient is hard on my fuel pressure...

I understand the basics of OAR, but didn't know what scaling it past -.96 would do. This is a good thread and good link you posted! Thanks!

What do you have planned for next year?

 

[FoMoCoSHO]

SBS, I will be watching closely how this develops for you.

Your results will have an impact on what we decide to do vehicle wise next year.

Yea, we will see... I'm curious how well my car will respond.. I know keeping the lambse at .80 with an E20ish mix coupled with the cooler ambient is hard on my fuel pressure...

I understand the basics of OAR, but didn't know what scaling it past -.96 would do. This is a good thread and good link you posted! Thanks!

What do you have planned for next year?

So many options I'm not sure yet...

One is giving Sparkie to the Mrs and getting a gen 4.1 SHO for myself and getting a motor built, big snails, and a big DI pump so I can go crazy with corn. When I'm ready to do the motor I'd like to turn up the wick on the stocker till it pops....for science, ya know, lol.

 

[StealBlueSHO]

I'm hooked on corn.... 14.5 psi with 25 degrees of advance... knock sensor still wants to add more....no KR anywhere...

Can't get good logs right now, traction is a problem... too cold.

 

[SHOdded]

Corn on the cob ... butter ... salt ... YUM

 

[FoMoCoSHO]

I'm hooked on corn.... 14.5 psi with 25 degrees of advance... knock sensor still wants to add more....no KR anywhere...

Can't get good logs right now, traction is a problem... too cold.

Boost is nice but boost with a ton of spark feels incredible.

I had so much spark, I couldn't get to my boost target cause it didn't need it to hit demanded torque. The solution was to up the power.

 

[StealBlueSHO]

I'm hooked on corn.... 14.5 psi with 25 degrees of advance... knock sensor still wants to add more....no KR anywhere...

Can't get good logs right now, traction is a problem... too cold.

Boost is nice but boost with a ton of spark feels incredible.

I had so much spark, I couldn't get to my boost target cause it didn't need it to hit demanded torque. The solution was to up the power.

I'm tired of jumping threads to respond to you... lol...

Yea, you were at 27 degrees of spark? Brad seems to think I should be good where I am at since I'm just shy of MBT for my current load... but said depending on my fuel pressure he might want to add more... dunno... like I said... tires cant get warm enough to get a good 0-100 log...

 

[FoMoCoSHO]

I'm hooked on corn.... 14.5 psi with 25 degrees of advance... knock sensor still wants to add more....no KR anywhere...

Can't get good logs right now, traction is a problem... too cold.

Boost is nice but boost with a ton of spark feels incredible.

I had so much spark, I couldn't get to my boost target cause it didn't need it to hit demanded torque. The solution was to up the power.

I'm tired of jumping threads to respond to you... lol...

Yea, you were at 27 degrees of spark? Brad seems to think I should be good where I am at since I'm just shy of MBT for my current load... but said depending on my fuel pressure he might want to add more... dunno... like I said... tires cant get warm enough to get a good 0-100 log...

My spark limit is at 27 and I'm hitting 26.75 peak. Once summer fuel arrives I suspect we will ride the limit. I'm also not opposed to blending up a bit if necessary. Or dumping a couple of bottles of HEET in the tank.

Better life through chemistry....