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XfireZ51 · 02-27-2011

Rob,

I was commenting on the article of COP conversion for the Toyota motor not on what you plan on doing. eficonnections provides a complete conversion for both early and opti-spark motors for conversion to CNP.
The LT-5 ECM code is a derivative of the L98 code. So no secondary injector drivers, no ignition coil controls. That's why the secondary injectors have their own power thru the 2ndary injector relay and are triggered by the primary injector. The L98 assumes a distributor. So it handles timing but not much else. The LT-5 is a more intelligent ignition module acting almost as a co-ECM.
That's why the crank signal goes to the IM and not the ECM. The IM has it's own processor. So we believe parameters like coil dwell are embedded in the IM firmware. That's why I am excited to have LT5Ignition on the forum. Maybe he can shed some light on this whole topic.

02-27-2011	#9
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,686	Re: LT5 Ignition Systems Question??? Rob, I was commenting on the article of COP conversion for the Toyota motor not on what you plan on doing. eficonnections provides a complete conversion for both early and opti-spark motors for conversion to CNP. The LT-5 ECM code is a derivative of the L98 code. So no secondary injector drivers, no ignition coil controls. That's why the secondary injectors have their own power thru the 2ndary injector relay and are triggered by the primary injector. The L98 assumes a distributor. So it handles timing but not much else. The LT-5 is a more intelligent ignition module acting almost as a co-ECM. That's why the crank signal goes to the IM and not the ECM. The IM has it's own processor. So we believe parameters like coil dwell are embedded in the IM firmware. That's why I am excited to have LT5Ignition on the forum. Maybe he can shed some light on this whole topic.