My apologies I was under the impression you could adjust ignition timing via the distributor. I thought that the coil pack 4.0's with the goofy cam sensor were the non adjustable without the fancy Chrysler scan tool. Good to know.
Originally Posted by jsawduste View Post
A few quick (but probably stupid) questions:
1. Does this work well on stock 4.0's (in case mine is not a stroker)?
2. I assume that it is reversible if need be?
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Originally Posted by Stingray427 View Post
High octane in fuel is there to make the fuel HARDER to burn. Designed for higher comression engines which you do not have.
Fuel with higher cetane burns easier but the gas companies control that chemical additive.
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Higher octane will reduce knock. The fact you are running 100 mph makes me think that things are not stock somehow. Did you check your codes? If you move the sensor to a cooker temp with the engine running hotter it will run a more advanced curve. I think out is the opposite of what you want to do.
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Originally Posted by Que89YJ View Post
Higher octane fuel is NOT harder to burn. It simply burns at a slower rate (slower flame front) as the octane level goes up. Depending on the additive package is MAY run cooler also but that is a wide generic statement. Cylinder pressure can be that of compression but also timing. Both ignition and valve. Many of today's modern engines run a high(er) compression but still get away with 87 octane fuel. There are way to many factors to consider then what an internet forum is worth.
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