hodgey001

My car has just came back from service had tatanium spark plugs oil change But i was running my car on normal unleaded which i have now chabged to bp ultimate no shell gagrages by me i have also put octane booster in her will it take a while to reset it self and get back to normal power. Also i disconnected my neg lead on the battery left it for couple of hours to reset the ecu then reconnected and poodled round town for 1/2 hour to see if it would reset anyone help.

sti-spec-a

After you reconnect the battery Wait till full operating temp Run the car up the gears 1st 2nd 3rd up to the redline then in 3rd at about 3500rpm keep your left foot on the brake and accelarate to build the boost up to your maximum limit This procedure sets up your knock control for your new fuel+octane booster and also maps your ecus boost curve (when to fuel and when to spark)

Cheers Grunt

johnfelstead

thats sounds a bit brutal.

This is how to reset your ECU http://www.mrtrally.com.au/performance/howresetecu.htm

If the engine feels flat immediately after the service and new plugs, then i would suspect the new plugs are either gapped incorectly or are dead. Titanium plugs? you sure? What plugs have you put in there?

sti-spec-a

It may sound harsh but when you reconnect the battery after a while,the ECU has lost its operating perameters.If you reconnect the battery and plod about the town the knock conrol will "learn" the new grade of fuel being used It will not set up a descent boost curve,you really need to take it right up through the gears,putting a load on the engine by left foot braking at 3000 rpm and putting a load on the turbo sets when the ecu fuels and sparks at boost pressure(the ecus boost curve),this sets up the ECU which will learn its new operating perameters within 5 or 6 miles As long as your engine is at normal operatin temp(Cold to hot by idle only) No damage will be done to the engine

Cheers Grunt

johnfelstead

there is absolutely no need to load up the engine with LFB, that stresses the turbo far more than it will ever see driven normally, it's a good way to blow your head gaskets too as the heat build up is intense. Sorry but that is bad advice for any turbo engine.

Bob Rawle

Its absolute tosh to suggest you need to ramp a car around after a reset, consider, a reset erases the learnt knock correction and fueling, if it had retarded itself, for example, then you now have a more advanced ignition map, so then you boot it around to teach it "something" it then dets. Not healthy at all.

If you increase your fuel quality and do a reset all you need to do is drive normally, a 35-40 mile drive of mixed use will settle it down but even thats not a requirement as it learns in any case.
Now depending on what model year the car is the ecu will also advance back again but the MY92-96 and MY97-98 are not good at doing that, the MY99-00 is much better and will advance itself up whilst the MY01 onwards is an instant reaction virtually.

So if improving fuel quality then reset by all means but just drive "normally" and in mixed mode as and when the car is used.
Bear in mind that you could make the car det to start with if the ecu defaults are too advanced, this is particularly true of any JDM spec car.

cheers

bob

sti-spec-a

Quote "there is absolutely no need to load up the engine with LFB, that stresses the turbo far more than it will ever see driven normally"

how do you suggest you get the ecu to learn a new boost curve
The difference is night and day between doing this procedure and not(i do it every month to compensate for the change in ambient temp) You only need to boost up the turbo for a couple of seconds it wont do any damage to the turbo, as long as you do it at operating temp


The original post stated that there was low power after disconnecting the battery The user was now using a better grade of fuel When he reconnected the battery he went about town,not the mixed driving you suggest IMHO this makes the ECU run less advance on the timing thus less power




Cheers Grant

[Edited by sti-spec-a - 12/23/2003 9:26:19 PM]

johnfelstead

just follow Bobs advice, it's spot on.

Jolly Green Monster

iTrader: (4)

PMSL.. reset the ecu and the raz it.. followed by a large bang and lots of clanging..

JGM

Bob Rawle

Grant read the post mate ..

"just drive "normally" and in mixed mode"

Mixed mode means as conditions allow, ecu will sort it as each set of conditions are met.

But whatever, your choice of course.

Btw as I read it, the first post made an assunption that a reset reduces power which, of course, is not necessarily correct. I can't interpret the guy as saying he reset and then HAD low power.

cheers and merry xmas

bob