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My 2024 Whipple Reg Cab Build

v8440

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Ford's logic to deal with various grades of gasoline. Essentially it's always trying to get more power out of the motor but backs off timing if the octane isn't good enough. That's how they're able to get the peak power out of the ecoboost engines while also still being able to eat ~85 octane. While at the same time being able to deliver much more power with 96 octane.

There's a PID in the PCM you can read that tells you how aggressive the timing is currently at ranging from -1 to +1.
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Ford's OAR stands for Octane Adjust Ratio.

It is a proprietary Ford system that has been implemented in their vehicles since around 2012. The OAR system is designed to:
  • Determine the quality (octane) of the fuel being used in the engine.
  • Proactively adjust engine parameters, primarily ignition timing, to optimize performance and prevent engine knock based on the detected fuel quality.
Here's a breakdown of how it works:
  • The engine's control unit (PCM or ECU) uses knock sensors to constantly monitor engine noise.
  • Based on the amount of detonation (knocking) detected, the OAR value is adjusted.
  • The OAR value ranges from -1.00 (very good fuel) to 1.00 (very poor fuel).

  • This OAR value is then used as a multiplier with timing compensation tables to determine the final ignition timing.
  • Better fuel quality (OAR closer to -1.00) results in more aggressive ignition timing, leading to increased engine power.
  • Poorer fuel quality (OAR closer to 1.00) results in less aggressive ignition timing, reducing the risk of engine damage from knocking.
In essence, Ford's OAR system allows the vehicle to automatically adapt to different fuel qualities, ensuring optimal performance and engine safety without requiring manual adjustments.
Thanks for explaining that.
 

ezndo

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Luv it! On mine, the IC pump kicks on every time I open the door prior to starting the truck For the first time. Also kicks on if I shut the hood when the engine is cold. Have you noticed that as well?
 

513Mugsy

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Nice build! I would like to change over the the center console and a raptor wheel with the paddles. But with current prices so high I will have to save my lunch money for a while.
 

Dynarider209

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This isn’t flex fuel. I’m running a smaller pulley, 3.75 (3.85 is stock). I also might run E30 at one point. A lot of the S650 mustang guys are running one so I threw it on.
nice build i also have 24 with stage 2 whipple . When you went with smaller pulley did you have to do anything to fuel system or were the rails and injectors that came with it enough?
 
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Crfdude86

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nice build i also have 24 with stage 2 whipple . When you went with smaller pulley did you have to do anything to fuel system or were the rails and injectors that came with it enough?
No you don’t have to swap injectors. I did add a boost a pump but that isnt a necessity I believe. Since tuning has been unlocked I’m switching to E85. Ordered a JD stage 2 fuel system and 3.5 pulley. According to the tuner I’m using (Preaux) the Whipple stage 2 injectors will be fine. Hoping for around 800whp.

Stay tuned for more updates. I’m getting rid of the leafs soon and having a Twisted Metalworkz 4 link installed.
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