Rear end ratio for boost
The crank signal has nothing to do with dwell time on the coils. I'm far from a Holley guru. But I'm told by those that are you can adjust and check dwell. Has to be done from a laptop. (can't do it on the baby screen) There is an advanced setting check box. Once this is checked you can go into ignition and look at the dwell times and adjust them if needed.
Thread Starter
On The Tree
Joined: Feb 2019
Posts: 157
Likes: 1
Yeah that's how u would set a table to input whatever u like.
I'm just saying unless u go custom and setup the table mine is just clicked under a 24x motor and won't let u see what the actual dwell times are for that setting
I'm just saying unless u go custom and setup the table mine is just clicked under a 24x motor and won't let u see what the actual dwell times are for that setting
So set the advanced table to 4 ms across the board in boost and 3 ms at cruise. I'm pretty sure you can go much higher on dwell with the LS2. I don't believe they autofire like the D585's. you'd need to research that. But 4ms isn't going to auto-fire anything. Guys wiht eh square truck coils go as high as 7ms in boost, then pull it back to let the coil cool at cruise. AHving stable voltage is also key here. If your volts drop way down at RPM, the dwell tables may be altered quite a bit.
Thread Starter
On The Tree
Joined: Feb 2019
Posts: 157
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found on the data logs i am running 1.5ms thorughout.
if i set it to say 3.5ms once in boost , thats what holley says to set this GM coil at. would it be worth opening the plugs back up to .025"
will that have much effect on the motor ?
if i set it to say 3.5ms once in boost , thats what holley says to set this GM coil at. would it be worth opening the plugs back up to .025"
will that have much effect on the motor ?
TECH Resident
Joined: Sep 2013
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From: Mechanicsburg, PA
Up the dwell first and see how it runs. Then up the gap a few thousands at a time till you experience blow out or reach a happy spot. The widest gap you can run will give the best available spark to the mixture. It's a balancing act between gap and enough spark energy to jump the gap under cylinder conditions.
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On The Tree
Joined: Feb 2019
Posts: 157
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ok ive made a mistake the data log i looked at was 1/100 and its the only one where i had the ignition set incorrectly and was on 1.5ms dwell.
im actually set at 4.5m/s .
the time i had 1.5m/s and the .015" gap it ran fine under boost.
the holley instructions say my ls2 coils shud have a maximum dwell of 3.5ms , so maybe ill set it a bit lower and see. possibly they r geting too hot and firing incorrectly ?
if so am i better off going with 1.5ms out of boost and anything in boost 3.5ms
im actually set at 4.5m/s .
the time i had 1.5m/s and the .015" gap it ran fine under boost.
the holley instructions say my ls2 coils shud have a maximum dwell of 3.5ms , so maybe ill set it a bit lower and see. possibly they r geting too hot and firing incorrectly ?
if so am i better off going with 1.5ms out of boost and anything in boost 3.5ms
Never heard that on the LS2 coil. If you aren't at the higher dwell for any length of time I can't see the coils overheating.
The Holley does do individual spark and fuel right? Not batch fire? You can idle and cruise around at 1.5 and just run the 3.5 max setting in boost. That still seems low. I'd verify that. They may have put it in there just to cover their asses on the D585 coil. Since they tend to auto spark much above 4.5ms. I'm not aware of the LS2 coil doing that (but I'm not positive) Also the MS usually varies a lot with voltage. So if voltage drops the ms usually jumps up to counter. I'd need to see the tables and how/what Holley does with dwell.I don't allow mine to fluctuate with voltage. Cruise at 2ms and bump it up to 5 on my square truck coils. .025 gaps and no issue at 19lbs on e85. Similar in my rx7... tho I run d585s in that and limit max dwell to 4ms in boost.
If it runs fine gapped at .015 you may just leave it instead of trying to reinvent the wheel. Tiny bit of power may be lost and idle quality usually suffers a tiny bit at small gaps. Thats it!
The Holley does do individual spark and fuel right? Not batch fire? You can idle and cruise around at 1.5 and just run the 3.5 max setting in boost. That still seems low. I'd verify that. They may have put it in there just to cover their asses on the D585 coil. Since they tend to auto spark much above 4.5ms. I'm not aware of the LS2 coil doing that (but I'm not positive) Also the MS usually varies a lot with voltage. So if voltage drops the ms usually jumps up to counter. I'd need to see the tables and how/what Holley does with dwell.I don't allow mine to fluctuate with voltage. Cruise at 2ms and bump it up to 5 on my square truck coils. .025 gaps and no issue at 19lbs on e85. Similar in my rx7... tho I run d585s in that and limit max dwell to 4ms in boost.
If it runs fine gapped at .015 you may just leave it instead of trying to reinvent the wheel. Tiny bit of power may be lost and idle quality usually suffers a tiny bit at small gaps. Thats it!