93monster150

My truck has no stickers under the hood so nothing to be sure on but I was thinkin its .44 and if u set it a lil higher will it do any good

explorerst4x4

I set mine to 54 and noticed a power gain, then get the rest of the stuff for a sixlitre tuneup. Big difference in horsepower and MPG if you can keep your foot out of it. Do a search for the sixlitre tuneup.

bluecar5556

stock specifications:
gap=.042"-.046"
torque=14-20Ft-Lb -@LLD@T@

Buck_Wild

I always gap at .044

bluecar5556

I say if the gap is larger than stock specs, get a higher output coil because widening the gap is going to increase the coil's dwell time (saturation,) which in turn will make it output at a higher voltage and possibly reducing it's life from operating at a slightly warmer temp.

Then again, having a coil with too high of an output will only eat up sparkplugs like PEZ under low compression ratios (8.8-9BAR)

Higher CR=higher voltage needed to overcome compression
Lower CR=lower voltage needed to overcome compression

bluecar5556

Normal secondary ignition coil oscilloscope pattern

explorerst4x4

An aftermarket MSD Streetfire coil outputs 48,000 volts. The factory Ford coil outputs 50,000 volts. An aftermarket high output coil is not needed. I would rather use the factory Ford than the Chinese MSD. If it was a high RPM motor, I would agree with you, but stock motors don't hit the RPMs that would necessitate a high output coil. Just my 2 cents.

bluecar5556

Exactly my point,
Higher CR=higher output
Lower CR=lower output

The dwell time, the coil must saturate longer to overcome a larger gap, therefore the coil WILL be higher output. The ford coil spec 50kv is @ .044" electrode gap, not @.054" that some people run.