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R33 ECU? are they driver 'adaptive', like modern auto trannie's

superspit

By superspit,
in Engines & Forced Induction

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superspit Mentor

superspit

Posted
Posted

Hi Skliner's, hows it ...ahhh...doesn't matter.

I thought that I may pose a 'querky' (?) question on the standard 33 ECU.

If I was to drive very sedately and conservitively, everyday, no sudden jabs or take-offs, would I get into a conservative map (for the want of a better word) or a slightly 'retarded' set of 'numbers' in my ECU?

Is R33 ECU adaptive to the driver's inputs like a Magna Automatic transmission computer, for example?

My reasoning for the question?......If I perform an ECU owner re-set (batt. disconnect then brake pedal depress x 10, because some people suggested that this is how its done), then go for a 'spirited' drive, the car gets all touchy and 'ready for anything'. (fast,...so it feels).

Conversely, if I drive to work and back for a few days, and on the friday nite I want to 'give it some', then it just doesn't seem to have that 'responsiveness' to it. It also doesn't 'climb' to redline as quick as it could/should. But that same night, after some more 'spirited' driving (eg. brake pads smelling), she'll come back and feel 'kick-ass' again.(?)

I don't want this thread to become a discussion on the petrol I use, or the condition of my plugs, IC clamps, oil and air filter......please consider everything else on my car to be as good as yours, for example!!

Let's talk just about my 'theory' and if it's crap or not...Or am I just 'over-estimating' the std ECU?

Can't wait for responses...!! anyways...............

thanx Skliner's,

SuperSpit Mark. :looney:

predator Grand Master

predator

Posted
Posted

you're over estimating the stock ECU.. :(

those things you are noticing are probably more likely to be results of temperature changes, air humidity, and whatever else in the outside air. And also after driving the car for a while it will idle much more smoothly, etc simply because it has warmed up properly. Doing short start-stop trips doesn't allow the car to do that.

superspit Mentor

superspit

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Posted
you're over estimating the stock ECU.. :)

those things you are noticing are probably more likely to be results of temperature changes, air humidity, and whatever else in the outside air. And also after driving the car for a while it will idle much more smoothly, etc simply because it has warmed up properly. Doing short start-stop trips doesn't allow the car to do that.

Nup!! I never do 'school runs'.

lwells Grand Master

lwells

Posted
Posted
I think the r33 gtst ecu does do alittle bit driver learning from what i have read in regards to to abit of timing put in and out.

That not really 'learning' though, thats just reacting to air and fuel conditions which is nothing special, to put it mildly.

There really isn't much reason to have a learning ECU on a car the vintage of an R33. Its a 'sports car', produced when fuel consumption and emissions wasn't such a huge issue, so I would expect it to run aggressively regardless of how the driver drives.

LW.

superspit Mentor

superspit

Posted
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Posted
That not really 'learning' though, thats just reacting to air and fuel conditions which is nothing special, to put it mildly.

There really isn't much reason to have a learning ECU on a car the vintage of an R33.  Its a 'sports car', produced when fuel consumption and emissions wasn't such a huge issue, so I would expect it to run aggressively regardless of how the driver drives.

LW.

I see your point. (and I do like your example.)

Why would it be neccessary therefore, to have this ECU 'storing' numbers (data) from ignition start to ignition start.. or are these numbers static for reference use only, ie MAP. (for eg). Also, do others notice a slight difference in performance (good or bad), when they've done an ECU reset...(not a proper one, the one where they just disconnect the batt and depress brake pedal, for example?)

ECU's (std or aftermarket) do have a form of variable RAM memory (not talking reference ROM here), don't they?...So therefore, would this become the 'adaptive' (changeable) part of the 33 ECU, according to it's inputs etc. eventually affecting it's outputs (ie potentially power output)????

anyways..........

Thanks Iwells and Skliners

lwells Grand Master

lwells

Posted
Posted

I could be pulling monkey's out of my arse, but what I posted above would be my best guess.

Regarding your questions:

* Why would it store data? Diagnostics mainly, I would imagine.

* Just because the ECU is monitoring certain sensors and recording data, doesn't mean that it is reacting/changing its behaviour based upon that data.

* Some sensors it would be reacting too: air temp, air flow, fuel quality are all important in determining how much timing the ECU would be pulling (or not pulling).

I imagine that the reason people experience a boost when resetting the ECU is because, being a Japanese car, it probably starts with a base map that assume that fuel has a slightly higher RON than the muck we get.

Again, all guesses.

LW.

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