ok, i just talk today with Tom he work on technical support at Greddy.

he officialy told that the diode will resolve the problem of burning coils.
aslo he recommend me 1N4002

 

I have the 1N5400 diodes installed and the blue emanage.. The guy who installed the emanage was my dyno guy.. In the process of dynoing the car he left the ignition on with the motor off a lot while he messed with the laptop..not one problem...

Sometimes my car randomly stalls (BOV..vacuum leak..long story) from idle and one time it did it and I didn't notice until like 10 mins later (I was out of car).. no problem.. no blown coils..

Is everyone installing these diodes the right way? They are directional right? If you install them backwards they are useless?

--mike

 

This is true, under normal driving conditions. IMHO, I wouldnt take the chance, of leaving the key in the on position without the motor running. The coils arent cheap.

When the engine is running, there should be no issues.

 

yeah i know i never leave the key in ON position without the engine running


my coils burn on normal driving conditions, thats why i install the diodes