I'm trying to find negative trigger remote style coil packs. I need it for an Ls swap that can't trigger the gm 4wire coil packs. I'm hoping for two-4 channel, 4 cylinder packs but everything I can think of is a wasted spark setup. The PCM I'm using to run the Ls will be unhappy if it doesn't see all 8 coils.
Any thoughts?
Thanks, Matt
everything i can think of is waste spark or cop
Saabs use a 4 coil pack, called a DIC. Pretty unreliable unit and I don't know much other than that.
By negative trigger, do you mean the negative terminal of the coil is wired directly out? Not really aware of any of those in a pack form that aren't wasted spark. 2000s era VWs used a four cylinder coil pack with a 5V logic level trigger that could fire all four channels separately.
Aspen wrote: Saabs use a 4 coil pack, called a DIC. Pretty unreliable unit and I don't know much other than that.
It's two coils in the SAAB cassette.
It's also two multi-strike, capacitive discharge ignitions in there, too. SAAB put a pair of MSDs in there!
99-00 contour 4 cyl?
Umm, just use a 4 channel wasted spark, and ground one side of each coil output.
I looked into the Contour coil pack, it's wasted spark. Dang...
Knurled wrote:Aspen wrote: Saabs use a 4 coil pack, called a DIC. Pretty unreliable unit and I don't know much other than that.It's two coils in the SAAB cassette. It's also two multi-strike, capacitive discharge ignitions in there, too. SAAB put a pair of MSDs in there!
There is even more than that going on in the SAAB DIC, they detect knock and feed that, and other information back to the ecm.
When maintained correctly in a stock engine (use only the exact OEM NGK plugs, change often, DIC vaporizes plugs but the plugs are inexpensive, its to late if you wait for them to misfire), DIC units can last a long time. My last 9000 had a DIC that lasted 200k miles. I'll admit that the earliest oil filled DICs were weak, but by the mid nineties they were robust. Failures can often be traced back to badly worn, or off-brand plugs, and really high boost levels.
Sorry for the thread jacking rant.
Why can't regular LS coils be used?
They utilize a 5v square wave that controls the dwell and then they trigger on the falling edge.
erohslc wrote: Umm, just use a 4 channel wasted spark, and ground one side of each coil output.
Bump. Again: JUST GROUND ONE HV OUTPUT FROM A WASTED SPARK COILPAK.
On wasted spark coil, the HV winding 'floats', each end goes to a spark plug, so that it fires both at the same time from the same primary coil pulse.
So ground one side instead of hooking it to a plug, and the other side works just fine as a single ended coil.
The primary windings are typically joined together to a single terminal, should pose no issues.
In fact, maybe better than fine, since it must now fire only one plug gap instead of two.
Carter
xFactor wrote: They utilize a 5v square wave that controls the dwell and then they trigger on the falling edge.
If you can't use that signal, your best bet would be eight individual coils - I'm not aware of anything in a coil pack type form factor that had all the coils individually triggered.
Um... why arent you using the GM ecu? The GM harness is practically a standalone harness already, and the GM ecus are better than most standalones (no offence Matt). Add HP tuners to the stock ecu and you're good up until you need either an exceptionally complex chassis computer setup or are trying to make over 2000hp. Stop making E36 M3 complicated. AND the LS truck coils are some of the best ignition coils you can buy.
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