Ignition Curves.....
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Seasoned HDF Member
Joined: Mar 2010
Posts: 21,116
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From: Poolville
Ignition Curves.....
Looking for ideas (on a well built motor) on ignition curves without going overboard. I have a Dynatek 2000i and would like to set up several curves based on ambient temps. Under normal situations what is the max advance an 80" evo would perform it's best and at what rpm would i want that max advance. Some of the curves i've been creating are as follows
12*@ 1000 rpm
24*@ 2000 rpm
29*@ 2800 rpm
31*@ 3100 rpm
32*@ 3800 rpm
33*@ 4200 rpm
35*@ 3800 rpm.
For hotter days I'm going with this curve
8* @ 1000 rpm
18*@ 2000 rpm
26*@ 2800 rpm
29*@ 3100 rpm
31*@ 3500 rpm
33*@ 3800 rpm to red line... Any suggestions would be appreciated, thanx
12*@ 1000 rpm
24*@ 2000 rpm
29*@ 2800 rpm
31*@ 3100 rpm
32*@ 3800 rpm
33*@ 4200 rpm
35*@ 3800 rpm.
For hotter days I'm going with this curve
8* @ 1000 rpm
18*@ 2000 rpm
26*@ 2800 rpm
29*@ 3100 rpm
31*@ 3500 rpm
33*@ 3800 rpm to red line... Any suggestions would be appreciated, thanx
Cruiser
Joined: Jul 2008
Posts: 117
Likes: 6
From: Uk and French Pyrenees
Hi Hot rod.
I am running the Dyna 2000i on my Bad Boy. Its running dual fire at the moment but I just don't think I am getting the most out of it.
As far as i have understood, I have only a few preset advance curve options on mine ( accessed by switching the small switches on the nose cone panel… With an andrews ev 27 and a 42 Mikuni the most aggressive curve starts to ping slightly and the one below that feels a bit flat when I open it right up.Am I perhaps missing something?
And do you think its worth getting set up for single fire? I'd appreciate your thoughts on it
I am running the Dyna 2000i on my Bad Boy. Its running dual fire at the moment but I just don't think I am getting the most out of it.
As far as i have understood, I have only a few preset advance curve options on mine ( accessed by switching the small switches on the nose cone panel… With an andrews ev 27 and a 42 Mikuni the most aggressive curve starts to ping slightly and the one below that feels a bit flat when I open it right up.Am I perhaps missing something?
And do you think its worth getting set up for single fire? I'd appreciate your thoughts on it
Seasoned HDF Member
Joined: Nov 2010
Posts: 17,548
Likes: 7,199
From: Oxford, Nc
Just like you can run the lowest octane in your bike as long as it doesn't 'knock', I'd run the more radical ignition curve and if it objects to that, back it down a bit. That way you know you're getting all that it'll give.
Cruiser
Joined: Jul 2008
Posts: 117
Likes: 6
From: Uk and French Pyrenees
Thanks Stiggy.
It pulls good on the more aggressive curve but if felt it starting to ping a little if I was lazy shifting down. How much ping is ok?
And on another point…I'm running andrews gear drive cams in my 2000 road king ( 37Gs). I did the top end to 95 inch when I did the cams at 12k miles. It just turned 30k. The cams are noisy ( always have been which is to be expected), but I wondered, did you notice yours getting noisier as they racked up the miles? And if so did you do anything to fix it to just live with it…Small price to pay I guess for not having to sweat about tensioner issues right?
It pulls good on the more aggressive curve but if felt it starting to ping a little if I was lazy shifting down. How much ping is ok?
And on another point…I'm running andrews gear drive cams in my 2000 road king ( 37Gs). I did the top end to 95 inch when I did the cams at 12k miles. It just turned 30k. The cams are noisy ( always have been which is to be expected), but I wondered, did you notice yours getting noisier as they racked up the miles? And if so did you do anything to fix it to just live with it…Small price to pay I guess for not having to sweat about tensioner issues right?
Last edited by burgs; Apr 11, 2015 at 04:00 PM.
Seasoned HDF Member
Joined: Nov 2010
Posts: 17,548
Likes: 7,199
From: Oxford, Nc
Some may argue with me but I say None. Detonation is a bad thing. Either don't run it where it'll ping or back it down a notch at the rpm and throttle position setting where its occurring. You won't lose much.
Thread Starter
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Seasoned HDF Member
Joined: Mar 2010
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From: Poolville
Burgs, What curve are you pinging on? also what gear, rpm, tipping the throttle in on cruising or hard acceleration cruising? Curve 2 is the best curve to use for most applications. It should be fine up to 10.2:1 comp. Anything over that you probably will have to use curve 3 or possibly even curve 4 depending on how much compression you have. You can build your own curve and down load it to the module but when you do that you are going to write over the four curves loaded from the factory and you will only be able to load one custom curve leaving no flexibility on hot days or not being able to get good high octane fuel. I never run anything lower than 93 octane and use 104+ on hot days. For myself I would like to know at what rpm would it be most appropriate for full advance?
Also I'm getting mixed reviews on single and dual fire coils. Supposedly a dual fire was introduced to lower epa emissions and if that dual fire fails then no spark at all but on a single fire if one coil fails the other will still fire for it's specified cylinder. sort of like get me home mode just be careful not to wash down the dead cylinder with fuel and dilute your oil. Some will also say more hp with a single fire but no proof of that either. so I guess it's about preference.
Also I'm getting mixed reviews on single and dual fire coils. Supposedly a dual fire was introduced to lower epa emissions and if that dual fire fails then no spark at all but on a single fire if one coil fails the other will still fire for it's specified cylinder. sort of like get me home mode just be careful not to wash down the dead cylinder with fuel and dilute your oil. Some will also say more hp with a single fire but no proof of that either. so I guess it's about preference.
Cruiser
Joined: Jul 2008
Posts: 117
Likes: 6
From: Uk and French Pyrenees
Thanks Hotrod. Yup. I reckon curve 2 runs it best. I think I'll stick with that ( and there's no signs of pinging anywhere on it. ) I rode about 80 miles today and switched between curve 2 and 3. 3 did give it more grunt on the power but I could feel it starting to ping in 2nd and 3rd before it gets on the power.
As for the single/double fire, if you don't reckon there's mch to be gained with the single, I reckon I'll save myself the trouble of getting set up for it. Thanks for your input.
As for the single/double fire, if you don't reckon there's mch to be gained with the single, I reckon I'll save myself the trouble of getting set up for it. Thanks for your input.
Last edited by burgs; Apr 12, 2015 at 01:12 PM.
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Road Master
Joined: Jun 2011
Posts: 836
Likes: 230
From: Deep South
if starting to ping on curve three just alittle ....try giving it just a little more fuel w/ the timing ....may really what more fuel and timing ...to "get on the pipe " ...when it dose get on the cam ...you will know it !!!
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Cruiser
Joined: Jul 2008
Posts: 117
Likes: 6
From: Uk and French Pyrenees
It might be relevant that when I adjust the mixture screw as I open it up it doenst loose the beat even after four full turns. Might I need to have a look at the pilot?
Road Master
Joined: Jun 2011
Posts: 836
Likes: 230
From: Deep South
Pilot Screw
yes , if you are more than 2-3 turns out and no change in the idle , you need to change to the next bigger pilot/slow jet ...what we mean about the timing /fuel ...is that sometimes adding fuel will help the pinging but (depends on how much you end up adding )(which is determine by how bad the pinging is ) ,then you may need to retard the timing a degree or two also as you are putting more fuel and the explosions happen faster so the timing needs to get a little closer to TDC ...before going off ...are it will want to drive the crank back the the wrong way(so to speak) which will actually slow the bike down (lose power) ...