advanced timing pros and cons

[ORCoaster]

Could it get better?  How many friends do you have on tap to push the car around town.   Mileage could be a record setter.  Forget that 100K VW that gets 261 MPG.  Got the 1980 or 90s version that never needs filling.

[TylerDurden]

My personal goal is to tweek all my rigs to 50mpg or better. (All have bested 50mpg excl. the Westy.)


I'm curious to know more about EGTs rising as a result from retarded injection timing*.

My butt-dyno is telling me I'm getting less nailing and more boost... possibly from hotter exhaust gasses, as the combustion starts later?



*At some point, timing could be so retarded that fuel is still burning as the exh. valve opens, but how about before then.

[vanbcguy]

EGTs definitely rise with retarded timing, for exactly the reason you list - the more retarded the more combustion is still occurring at exhaust time.

Boost levels will be higher with timing retarded a bit, again for the same reason. Gasses still expanding as they enter the turbine = more force on the turbine = more boost pressure.

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