FLAT FOOT SHIFTING=ROLLING ANTILAG

[SOLID2223]

Hello looking for some tuning experts opinions with my idea. I recently had a theory to use the FFS(flat foot shifting) feature integrated into the ecutek software as rolling anti lag. To my understanding for FFS to engage throttle must be at 100% and clutch has to be depressed. I was thinking about using a secondary switch for my clutch switch”tricking” the ECU into activating the FFS feature WITHOUT the clutch depressed. Hence creating”rolling anti lag). Yes I’m aware this isn’t true anti lag however it could be useful in building boost for stock motors while rolling. My main concern is the engine load would differ greatly because during FFS there is no load due to the clutch being depressed. So if the FFS feature were to be used as anti lag without a depressed clutch would the feature still function as designed?


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[blsfrs]

Originally Posted by SOLID2223

Hello looking for some tuning experts opinions with my idea. I recently had a theory to use the FFS(flat foot shifting) feature integrated into the ecutek software as rolling anti lag. To my understanding for FFS to engage throttle must be at 100% and clutch has to be depressed. I was thinking about using a secondary switch for my clutch switch”tricking” the ECU into activating the FFS feature WITHOUT the clutch depressed. Hence creating”rolling anti lag). Yes I’m aware this isn’t true anti lag however it could be useful in building boost for stock motors while rolling. My main concern is the engine load would differ greatly because during FFS there is no load due to the clutch being depressed. So if the FFS feature were to be used as anti lag without a depressed clutch would the feature still function as designed?


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A couple of years ago, my tuner left FFS engaged. What is did was cause my engine to bog down as I was revving up and preparing to shift because I unconsciously put a light pressure on the clutch pedal.

A datalog showed that FFS dropped the ignition timing to 0* when the engine was over 4500 rpm and my foot touched the clutch.

So, in my nonexpert opinion, I don't think FFS will do what you are seeking.

[SOLID2223]

Originally Posted by blsfrs

A couple of years ago, my tuner left FFS engaged. What is did was cause my engine to bog down as I was revving up and preparing to shift because I unconsciously put a light pressure on the clutch pedal.

A datalog showed that FFS dropped the ignition timing to 0* when the engine was over 4500 rpm and my foot touched the clutch.

So, in my nonexpert opinion, I don't think FFS will do what you are seeking.

Did the datalog show the rpm holding or increasing during the time FFS was active


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[blsfrs]

Originally Posted by SOLID2223

Did the datalog show the rpm holding or increasing during the time FFS was active


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My butt dyno and the datalog showed rpms holding. It was like a governor or rev limiter kicking in.

[SOLID2223]

Originally Posted by blsfrs

My butt dyno and the datalog showed rpms holding. It was like a governor or rev limiter kicking in.

So my theory was correct it will hold the rpm if the car is still in gear without the clutch depressed.


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[blsfrs]

Originally Posted by SOLID2223

So my theory was correct it will hold the rpm if the car is still in gear without the clutch depressed.


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I was pondering your idea. You may not have to install an extra switch. The clutch switch will "activate" with enough pressure to move the pedal a pube hair's distance. You could experiment by turning the cruise control off by touching the clutch pedal.

[SOLID2223]

Originally Posted by blsfrs

I was pondering your idea. You may not have to install an extra switch. The clutch switch will "activate" with enough pressure to move the pedal a pube hair's distance. You could experiment by turning the cruise control off by touching the clutch pedal.

I understand your idea however your clutch assembly already has preload and barely pressing the clutch could cause abnormal damage to the clutch pressure plate and throw out bearing. That’s why people say don’t ride the clutch. Along with slippage from the friction disc.


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[blsfrs]

Originally Posted by SOLID2223

I understand your idea however your clutch assembly already has preload and barely pressing the clutch could cause abnormal damage to the clutch pressure plate and throw out bearing. That’s why people say don’t ride the clutch. Along with slippage from the friction disc.


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You might be surprised how little pressure it takes on the clutch pedal to active the clutch switch. It's not enough to cause any problems with the clutch.

[SOLID2223]

Originally Posted by blsfrs

You might be surprised how little pressure it takes on the clutch pedal to active the clutch switch. It's not enough to cause any problems with the clutch.

I will try it out and see how sensitive the switch is and I will go from there


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