No open is when you have your foot down.

Edit.

 

My bad wrong way round

 

The Unichip was good.

No way of knowing if it had learned or not - the only conclusive way to know would be seeing what AFR and degrees of ignition timing were set before and a while after.

Its things like these which nobody knows, which leads me to believe that the "learning" claims are rumour - like much on car owner forums!

Willing to be proven wrong!

 

I often forget.

Way to rememer is that closed loop is a feedback loop where the lambda reading is being used by the ECU.

Open loop imlies that the signal is going nowhere - ie when you are WOT.

 

True, true.

I always wanted you to dyno you car afterwards on an independent dyno to settle views/opinions

IIRC dastek has recently brought out a newer version of the unichip, 'qubec' or 'q' something like that.

 

Yep it would have been good, but I decided I wasn't fussed what others thought Its been used by 4 of us on here now and all very happy. I know one recent chap who got similar results to me, and then your results also suggest an increase.

 

I can't see how this "learning" would be anything but fairly instant, but dyno's I've seen don't show this. The resolution on a lambda sensor is fairly rubbish though.

I've seen the cars then re-learn 6 months later (on the same dyno) though.

This was not on S2000's, but I can't see ECU's getting dumber/losing functionality.

 

It would be the "long term fuelling trims" which would take a while to adjust.

Another case in point is the Mitsubishi Evo 8 / 9.

On the FQ320 model, the standard ECU is used with a Unichip to increase boost and adjust *open* loop fuelling - and this is an official Ralliart mod. They must have looked into it and decided the stock ECu would cope,

 

Not sure why they would adjust the fueling for an extra 20hp ..

I'd understand an ECU for more boost (as you'd need a solenoid or a new actuator) and maybe for diff sized injectors, bigger boost map.

But why adjust closed loop fueling?

You see similar issues when lambda's go out of spec (like the dodgy fuel thing last year). The Sensor goes out of spec, and over a few weeks peoples cars start running rich. Not sure the few weeks was down to that's how long the ECU took, or down to that's how long the sensors took to get coated in cack.

 

The extra 20 bhp comes from extra boost pressur,e which of course needs fuel and ignition changes.

Its just a cheap and chherful way to squeeze more power out the stock ECU.

Closed loop fuelling isnt touched. I put closed insted of open!

Failing lambda's are a bugger, They fail lean / low voltage so the ECU starts bunging in more fuel

Used to be nearly a service item on the older Scoobs!