Problem tuning stable idle with $12P

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Re: Problem tuning stable idle with $12P

Postby delcowizzid » Thu Jul 13, 2017 9:22 pm

You can target 14:1 If you want the later model stuff with sequential injection does but being batch fired I stay richer to smooth out idle and they tend to rev nicer on throttle crack.as long as you get it away from 14.7 so it doesn't go into closed loop fueling at idle and surge you'll be fine. There's iac adjustments for how far from target rpm it can get before adjusting iac to compensate as well as the idle proportional spark to help stabilize idle if you have the idle spark advance set lower so it can gain torque by raising timing
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Re: Problem tuning stable idle with $12P

Postby MAGP » Fri Jul 14, 2017 1:12 pm

In other software I always commanded 14.7 idle afr and never had an issue. Why would 12P be any different?

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Re: Problem tuning stable idle with $12P

Postby antus » Fri Jul 14, 2017 1:56 pm

Because the OS triggers open loop mode for exactly target=14.7 AFR as that is where the narrowband should be functional to allow it. In factory tunes idle is not set to this.
Have you read the FAQ? For lots of information and links to significant threads see here: viewtopic.php?f=7&t=1396

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Re: Problem tuning stable idle with $12P

Postby MAGP » Fri Jul 14, 2017 3:07 pm

Don't you mean closed loop?

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Re: Problem tuning stable idle with $12P

Postby antus » Fri Jul 14, 2017 4:23 pm

Yes, i do ;)
Have you read the FAQ? For lots of information and links to significant threads see here: viewtopic.php?f=7&t=1396

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Re: Problem tuning stable idle with $12P

Postby MAGP » Fri Jul 14, 2017 4:59 pm

I thought so, typos are bound to happen :lol:

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