Idle Hunting

[Jason]

Ok so my motor runs, but im trying to set the idle.

Its supercharged so i always though it would have some hunting, but not this much. With the supercharger off, it goes between 800-1300rpm with the supercharger on its goes between 600-2000 rpm

is there any speical trip to tunning the ecu or something to lower how much it dose it or do i have to get used to it....


J

[riceburner]

Whilst i never heard of it working on a gze i know my 4age that if the idle hunts like that, a quick clean of the throttle body will usually solve it.

[Jason]

nar its all squeeky clean,

got a couple ideas, like atm i havnt tuned the VE maps, so i might be ideling and getting to much fuel (you can smell it bad) reving up then falling back to idel

[Jason]

yes it is very simalar....

getting a vid tomorow

[« R²» Blinky]

Awww cmon man, there is nothing wrong with lol, im hoping mine dosent go away lol

http://www.ae86drivingclub.com.au/forums/emoticons/tongue.gif

[damo101]

just got mine started just then..it does the same too

[Hen is a total nutcase]

Is your throttle pre-SC?

If so then you must have a long inlet tract (piping, SC, piping, IC, piping, manifold). To tune idle with such a big inlet is hard. One important thing is to adjust the idle speed response to be SLOW.

Too fast a response will cause hunting, too slow will let it fall through idle.

Unsure what computer you are using and what options it has, but on my Wolf I could set default ISCV position by temp, ISCV tracking speed and target idle speed.

To get it to work "nicely" I upped the idle speed to 1100, set the default ISCV position a little higher than required (so you don't fall through idle when getting off the gas) and slowed the tracking right down. Not perfect, but it works most of the time.

Hen

[Jason]

ok found problem, it was 2 things, one after i ajusted the idle control i forgot to reste the TPS calibration back to 0, two, the troatle is aculty moving in and out from the section, when i hold it down it smooths out to almost no hunt.

Hen i am running the TB before the supercharger but my intake track is small compared to normaly gze piping (due to IC intake/outlet same side) im running a megasquirt, but i havnt bothered installing a idle controller.


So now after a few secs (after start enric) its stops hunting if the throale is closed

[Jason]

vid up in my project thread, better than it was before i fiddles withit, but mainly at the start was kinda what it was like

[damo101]

one after i ajusted the idle control i forgot to reste the TPS calibration back to 0,[/b]

does that apply to n/a 16v?

[Jason]

possiblt, i know it helped a shit load, but im running a megasquirt, i dont know how the stock ecu calculates its fuel. For me it was as easy as hitting the recalibrate button http://www.ae86drivingclub.com.au/forums/emoticons/tongue.gif

sorry if spelling is bad im writing all this from inside car on the laptop http://www.ae86drivingclub.com.au/forums/emoticons/tongue.gif

http://www.youtube.com/watch?v=i2QfKfEM-_U

[20sil]

Rev it, dont be a girl, lol nah good work, fells good when i starts for the first time.

[damo101]

didnt leave it running long enuf for it to get up to temp as there was no coolant or anything in the cooling system..

[Jason]

the vid goes for a bit longer and dose heat up but good point i dont normaly leave it for 2 long ideling (cuze of new rings). Lol you can rev your brand spanking new motor out to 8k if you want http://www.ae86drivingclub.com.au/forums/emoticons/tongue.gif

after about 15 secs the hunts prityy much gone but comes back at the end, i can live with that. But before it was unbeable. Still going to try getting it down some more.

[damo101]

Lol you can rev your brand spanking new motor out to 8k if you want[/b]

umm its not new i just chucked it in..didnt rebuild it or anything..but still..better wait till i get some water or coolant in the rad first..if it was a 4ac i couldnt give a shit lol