Ignition module
Thread Starter
|
Cruiser
Joined: Sep 2021
Posts: 109
Likes: 15
From: Beaumont
Ignition module
I would like to know from those of you who have a Dynatek TC88-2P ignition module what the purpose of the advance feature is for. I know it advances the spark, but exactly what happens when I do that? I currently have my Dynatek module set at 36B. i tried setting it to 34B, but it ran rough. I then set it to 38B, and it would try to buckle when I shut the engine off. But why would a novice like me want to mess with changing the spark? My mechanic tells me that my engine is now a 113 ci. The previous owner installed the Dynatek because the engine is high compression and has compression releases, and other modifications. It is a moderately modified engine I suppose. Sometimes, when I shut off the engine, it does not come to a full stop smoothly. I can only describe the sound as if the crank was trying to go in reverse before it comes to a full stop, and I hear a loud clank (not from the tranny).
Seasoned HDF Member
Joined: Aug 2017
Posts: 7,323
Likes: 11,762
From: Omaha,NE
An engine runs at peak performance when the ignition timing advance curve is set to the highest degree possible without detonation. This module gives you the ability to do that.
Dynatek recommends starting at 36A which closely matches a stock ignition advance curve, and add more advance to find the "sweet spot" your engine likes to run at. If it's pinging in the beginning of the process, switch to B curve adjustments, and so on.
In case you don't have them, the instructions are attached. Good luck.
Dynatek recommends starting at 36A which closely matches a stock ignition advance curve, and add more advance to find the "sweet spot" your engine likes to run at. If it's pinging in the beginning of the process, switch to B curve adjustments, and so on.
In case you don't have them, the instructions are attached. Good luck.
Thread Starter
|
Cruiser
Joined: Sep 2021
Posts: 109
Likes: 15
From: Beaumont
Can a change be done while the engine is running? If not, I suppose you make the change, take it out for a spin, and depending on how it runs, you change it while the engine is off? The previous owner had a dyno test done in 2018. The dyno sheet says that changes were made to the CV carb during three runs, but it does not say anything about the ignition module, or if it was installed at that time. I tend to believe that it was specifically set at 36B during the dyno runs, so that is why I hesitated to change anything, since it has been running pretty good. Besides, I am dangerous man in that I don't know what I don't know!!
Last edited by carlmartine; Mar 28, 2022 at 08:03 PM.
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,925
Likes: 8,027
From: poway
Engine run-on is typically of a motor that isn't tuned well and too hot of plugs.
Dump your ignition and buy a DTT. Go to Champion RA-6HC plugs. Below is the reason why the Dynatec ignition sucks. Timing curves are all screwed up.
https://www.hdforums.com/forum/engin...l#post20508299
Dump your ignition and buy a DTT. Go to Champion RA-6HC plugs. Below is the reason why the Dynatec ignition sucks. Timing curves are all screwed up.
https://www.hdforums.com/forum/engin...l#post20508299
Thread Starter
|
Cruiser
Joined: Sep 2021
Posts: 109
Likes: 15
From: Beaumont
Thanks. I was already thinking of changing the plugs to 6R12, but I will try the Champion RA-6HC. Also, I had tried one step colder on the RGK plugs, but I can't remember if it was doing the same thing, so I went back to the regular NGK. Maybe I will try another RA-6HC, and if necessary, one step colder. Thx.
Last edited by carlmartine; Mar 30, 2022 at 10:06 AM.
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,925
Likes: 8,027
From: poway
Don't remember what the stock plugs are but they are likely too hot on a higher compression machine.
DTT
http://www.daytona-twintec.com/tc88twincamignition.aspx
Thread Starter
|
Cruiser
Joined: Sep 2021
Posts: 109
Likes: 15
From: Beaumont
Don't remember what the stock plugs are but they are likely too hot on a higher compression machine.
DTT
http://www.daytona-twintec.com/tc88twincamignition.aspx
DTT
http://www.daytona-twintec.com/tc88twincamignition.aspx
Trending Topics
Thread Starter
|
Cruiser
Joined: Sep 2021
Posts: 109
Likes: 15
From: Beaumont
I have the Champion spark plugs on order. I also downloaded the instructions for the DTT ignition module. It states it requires a coil with less than 0.5 Ohm in the primary. My current coil has around 3 ohms in the primary. I always thought that less than 3 Ohms indicated a bad coil. Will I need to get another coil for the DTT ignition module? And how will the DTT be different/compare with my current Dynatek TC88-2P ignition module?
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,925
Likes: 8,027
From: poway
I have the Champion spark plugs on order. I also downloaded the instructions for the DTT ignition module. It states it requires a coil with less than 0.5 Ohm in the primary. My current coil has around 3 ohms in the primary. I always thought that less than 3 Ohms indicated a bad coil. Will I need to get another coil for the DTT ignition module? And how will the DTT be different/compare with my current Dynatek TC88-2P ignition module?
Thread Starter
|
Cruiser
Joined: Sep 2021
Posts: 109
Likes: 15
From: Beaumont
Yes, it is a twin cam. It has an OEM Harley-Davidson coil. I confirmed it with its part no and on Ronnie's Parts List. The Harley service manual for my 2000 Softail states that the "normal resistance range is 5.5-7 Ohms" (page 8-70) for the secondary coil winding. The secondary windings are the towers where the spark plug wires are connected, not the primary posts, whose normal resistance range is from 0.5 to 0.7 Ohms.
Last edited by carlmartine; Apr 3, 2022 at 10:17 PM.