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LT5 Ignition · 03-10-2011

XfireZ51 ref. post #35,
There are 3 operating points to challenge an ignition design.
1 idle requires higher energy ( longer, fatter spark ) to ignite the poorer mixture due to low air velocity across the injector. LT5 has high velocity across the primary injector at idle because the secondary runners are closed.
2 Peak torque has the highest cylinder pressure to ignite so you need the most secondary voltage to jump the gap. After the initial arc not much energy is required because the dense gas contains a lot of energy from heat and compression.
3 at high speed you start to run out of time to charge the coil or coils. Big problem with distributors on an 8 cylinder. 4 coil DIS helps because two coils can charge at a time.
I know the system has some margin for more power. but I have not tested it beyond stock power. I would be interested if some Forum members have.

03-10-2011	#45
LT5 Ignition Join Date: Feb 2011 Location: Sterling Heights, MI Posts: 11	Re: LT5 Ignition Systems Question??? XfireZ51 ref. post #35, There are 3 operating points to challenge an ignition design. 1 idle requires higher energy ( longer, fatter spark ) to ignite the poorer mixture due to low air velocity across the injector. LT5 has high velocity across the primary injector at idle because the secondary runners are closed. 2 Peak torque has the highest cylinder pressure to ignite so you need the most secondary voltage to jump the gap. After the initial arc not much energy is required because the dense gas contains a lot of energy from heat and compression. 3 at high speed you start to run out of time to charge the coil or coils. Big problem with distributors on an 8 cylinder. 4 coil DIS helps because two coils can charge at a time. I know the system has some margin for more power. but I have not tested it beyond stock power. I would be interested if some Forum members have.