I have a distributor based ignition setup.
was wondering if I could use a DIS coil in place of the regular single tower coil?
maybe possible to ground one high tension lead from the DIS coil to the engine block and route the other lead to the center of the distributor cap?
i already have a few GM DIS coils and i need a hotter spark.
I know the better answer is convert to wasted spark, and i will do that some day.
but for now just wondering if its possible and what dwell settings to use when controlling the coil with a VB921?
DIS coil in distributor configuration?
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
Re: DIS coil in distributor configuration?
Well, in case anybody cares:
I set up the DIS coil with one tower going through a test light to ground, and the other tower to the center terminal on the distributor cap.
Hooked up the primary wires and fired it up.
Ran good for about 30 secs then died.
Determined the VB921 was dead.
No problem, I have a couple BIP373 kits, so i soldered one on.
Fired over again and it ran.
Didn't die this time, ran for about 20 minutes.
BIP was barely warm with 3.4ms running dwell.
The scope showed similar firing and burn voltages for both coils at 20kv and 2.5kv respectively, but the burn time went from 0.5ms to 1.3ms for the DIS coil.
Burn voltage seems a little low, i'm going to open the plug gap some and see if that helps.
I set up the DIS coil with one tower going through a test light to ground, and the other tower to the center terminal on the distributor cap.
Hooked up the primary wires and fired it up.
Ran good for about 30 secs then died.
Determined the VB921 was dead.
No problem, I have a couple BIP373 kits, so i soldered one on.
Fired over again and it ran.
Didn't die this time, ran for about 20 minutes.
BIP was barely warm with 3.4ms running dwell.
The scope showed similar firing and burn voltages for both coils at 20kv and 2.5kv respectively, but the burn time went from 0.5ms to 1.3ms for the DIS coil.
Burn voltage seems a little low, i'm going to open the plug gap some and see if that helps.