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LT5 Ignition · 03-14-2011

The LT5 ignition control is similar to the L98 distributor system in that when you are cranking the ignition module provides the dwell and it is longer than run mode to handle the transient voltage and speed during crank . The engine is going to slow to worry about overheating the coil. Once you are above about 400 rpm, the ECM takes over dwell control with a shorter, probably <3ms dwell. I do not believe the ignition module is programmable but I will try to investigate. The ECM is. That would make sense why an LT5 may stall right before it hits idle on a crank to run transition using one of the following coils. '92 GEN 3 LS1 small block uses coils with around a 4-5ms dwell. The Gen 4 small block (~96? intro ) uses coils with around 3-4ms. I am curious why there is an interest replacing the DIS coils with a LSx type?

03-14-2011	#56
LT5 Ignition Join Date: Feb 2011 Location: Sterling Heights, MI Posts: 11	Re: LT5 Ignition Systems Question??? The LT5 ignition control is similar to the L98 distributor system in that when you are cranking the ignition module provides the dwell and it is longer than run mode to handle the transient voltage and speed during crank . The engine is going to slow to worry about overheating the coil. Once you are above about 400 rpm, the ECM takes over dwell control with a shorter, probably <3ms dwell. I do not believe the ignition module is programmable but I will try to investigate. The ECM is. That would make sense why an LT5 may stall right before it hits idle on a crank to run transition using one of the following coils. '92 GEN 3 LS1 small block uses coils with around a 4-5ms dwell. The Gen 4 small block (~96? intro ) uses coils with around 3-4ms. I am curious why there is an interest replacing the DIS coils with a LSx type?