I'm using the LS9 coils, D510C, in another application but haven't found much info on dwell times vs. voltage/rpm.

The only info i've found is this pdf that lists dwell times for LS2 and LS9 coils but for LS9 they seem a bit low?

http://pe-ltd.com/assets/an302_gm_lsx_ignition_coil.pdf

Anyone that has the actual values from the LS9 apllication SW?

/Dea

 

Hi 944 Turbo, the 510 is a GEN-IV coil. (Hitachi)

The N/A "sweet" spot IS about 2.43 ms @ 14 volts.

The MAX Dwell (Boost/NOS) is 4.8 ms @ 14 volts.

The SAE "pico load" procedure is used for the above tests.

I too have my version of a GEN-IV coil with 10% more voltage AND 15% more energy.

Lance, BTW I use my CO-2 Pressure Chamber to test without engine destruction.

 

Hi,

Thanks!

So something like the table below could work on a boosted engine (running ~16 psi boost, coil per plug, max 6800 rpm)?

8 Volt 8.4 ms
10 Volt 6.4 ms
12 Volt 4.7 ms
14 Volt 4.0 ms
16 Volt 3.0 ms

/Dea

 

Lance, I have a set of your upgraded 510C coils and very interested in this also.

Sorry I haven't gotten back to you on my progress, but I had a little "incident" with the car. Went out to test on the back roads and forgot to put the hood pins. At about 90mph, the hood came up and.........well, you can guess the rest. UGLY.

 

No reason to go as high as that at lower voltages. You could retain the 6.4 if you really wanted, but even that isnt necessary and would only be during cranking anyway. Hopefully you'd never see 8v !

 

Hi guys, PE-Ltd doesn't sell/test coils.
They manufacture ECU's mostly for bikes, now V-8s.

There are several ways to control Coil Dwell.
There are current "sense" methods for dwell control.
I like to let the ECU do the control with programmable objects.

Most modern ECU's have objects such as MAP dwell modifiers, NOS, AUX, Voltage Comp, Duty Cycle (RPM), modifiers are also present AND used to change the base Coil Dwell value.

Example : The Coil Dwell at WOT, max HP (Boost,N2O, etc.) would be 4.00ms. (14 Volts)

The use of Ohms Law for only the Battery Compensation = 8ms at 7 volts, 4ms at 14 volts, 3ms at 21 Volts, 2ms at 28 Volts. (mode=14 volts)

Then create a graph using these points to find any voltage value.

I hope Dee, this answer is what you asked ?
Your question Dee = NO
The Steveturbo "tech" refers to Cranking RMS Voltage, the Cranking Voltage when observer by a Scope can be MUCH lower.

Lance

 

Thanks!

What sparkenergy can be expected from the D510C, LS9 coil?

Do they have the same "early fire" behavior as the D585?