Mines currently at 17.8....but seems to idle better the more you give it. But im unsure as to what is too much??
What will happen if you give it to much?
I've had soooooo many idle issues with this thing since the EMS was installed. Trying to correct some of them. Ignition timing is the only thing i havnt tried yet.
how are you all measuring timing at idle? Would it be the same as "ignition advance" on a scangauge?
You can't ue a scan gauge with a ems.
I would assume there getting there timing numbers from the base ignition table/map.
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The purpose of ignition advance is to account for the lag time following spark ignition for combustion pressure to peak at 15 degrees AFTER TOP DEAD CENTER. A little fyi !
From posting this in a bunch of forums and with all the strange answers....it kinda makes me wonder if most people are just using the AEM base numbers.
From posting this in a bunch of forums and with all the strange answers....it kinda makes me wonder if most people are just using the AEM base numbers.
Isnt there a better way of tuning this?
idle timing is gonna be influnced most by large cam overlap, the dilution of exhaust gas will slow flame propigation (EGR), larger cams need more timing, chuck did a nice write up on timing and will explain allot, let your motor tell ya what it wants to idle at there is almost no chance of knock (as long as you dont get retarded)
When you say "let your motor tell you what it wants to idle at"...How do you know what it wants to idle at? If it idles good at 30 degrees of timing....do you give it that? How do you know if 30 degrees is what it needs?
No, I was being perfectly serious. Is your idle stable, yes or no? Add a little timing in, now is it better?
You can think I'm a retard all you want, but it's a pretty simple concept if you spent five minutes in the saddle as opposed to three days online looking to have your hand held by internet strangers.
edit: Oh, wait, has it been five days? My mistake, us retards are not very good at math.
THe idle is not stable no matter how much/little timing or how much/little airflow or how much/little fuel the motor gets.
Adjusting the IAC, throttle plate, fuel pressure, injector pulse width etc etc is all easy. I dont know how to find the correct amount of ignition advance at idle.
What im trying to do is start from scratch to try and get it to idle fairly decent.
This forum is about helping other people. Im not an expert at anything, but it seems like you are. And i know theres other people on here who are also. So what im looking for is some advise on how to adjust it.
Because of you cams and EMS, don't expect your engine to idle as smoothly as the a stock engine with stock cams and PCM.
I wouldn't be concerned with trying to hit a single timing value at idle. The actual value is not that important. As Joseph Davis was trying to say, (before you two started bickering) idle "quality" trumps that actual timing #.
The Stock PCM has a very sophisticated idle control better than any aftermarkert. Not only does it move the idle stepper a few hundred times a minute but it also VARIES timing.
Several PCMs, that have idle control, will vary timing too, doesn't the AEM?
nm I just looked,,it does: "Ign vs Idle RPM" it will vary timing a max of -5 to +10 from your base values. It also looks like it has "learning" capibilites. This is good.
imo leave your timing values "stock" up to 50Kpa and tune your idle "quality" within the Advanced idle trims. You'll probably have to raise the idle RPM to 950-1000 or so to improve things
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"Just because someone goes fast doesn't mean you should do whatever you think they did.
This path assumes they knew what they were doing, which isn't necessarily the case"..........RB Racing
Last edited by duster360 : 07-24-2009 at 12:03 PM.
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Ignition timing at idle
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Linear Mode
