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What Does Restting The Ecu Do?

lingeringsoul

By lingeringsoul,
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scathing Grand Master

scathing

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Posted

Pretty much what everyone else says.

Your ECU retains several parameters, and the algorithm uses them as variables when determining its actions.

So if the engine's knock sensors pick up stuff, it'll pull the engine back further and further to avoid breaking something. That's how the ECU adjusts to varying quality fuels.

It also has sensors to pick up various temps (inlet, EGT, etc) to adjust its settings to pro-actively avoid engine-damaging states of tune. So the hotter the weather, it knows to run less advance immediately, rather than waiting until your engine knocks to pull it back.

It might also determine from your driving style (i.e. steady state cruising on the highway) that you're not using power, and lean the motor right out to conserve fuel. Or run a more aggressive map if you're thrashing it.

Resetting the ECU clears all those parameters, so the ECU starts from a clean slate. So if you've been running bodgy fuel or babying the car and you've just topped up with some nice 98RON to hit the track, it'll be faster to switch to an aggressive mode than thrashing it and having the ECU notice.

If some of those parameters refuse to update, you might have to clear them forcibly by resetting.

scathing Grand Master

scathing

Posted
Posted

It won't damage the car as long as you take the appropriate precautions.

Obviously if you're running a filthy batch of 91RON unleaded in 30 degree ambient heat, your ECU is going to have picked that up and pulled back the performance to protect the engine.

You get rid of its knowledge that its dealing with less than ideal fuel and air, and then just hop straight in and thrash it.....the ECU will eventually re-learn and pull back the performance again. But, until that happens...........

But if you've loaded up a tank of known-good fuel and its nice cold weather, if the car's feeling a little sluggish its definitely worth giving an ECU reset a try.

It shouldn't affect your EBC settings. Unless your ECU and EBC have weird interconnects (perhaps you're running an E-Manage with your Profec? I don't know...I'm not that familiar with GReddy's products) the two units are standalone.

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