I jet for what the engine needs/plugs read & ignition time for ET,
that's what wins races, getting from point a to b the quickest
"{I rarely bracket/handicap raced thou, just heads up stuff & didn't worry about consistency, just best performance, for a given round}
higher MPH is/was HP, or even better weather/air/track prep conditions
or in my case, was usually a product of spinning allot in the 1st 330ft,
running higher RPM out the back door...
we've gone over this...LOL
what car are we talking about ?
I know you know this already,
not trying to be a smart ***, well mostly not
Best of both worlds
is to take out ignition timing on the big end,
jett to see the best plug readings, not hurt the engine,
take timing out after about 660ft
if it's timed instead of RPM actuated,
you could progressively back out timing at track incrementals,
like at the 330ft, then 660ft, then 1000ft, a degree {or 2} each or more if necessary
or after 5000-5500 rpm or so {maybe depending on what your specific combo needs}
maybe in each gear activated by the shifter like Long Roof recommended or even
every gear change drop another degree or so
run your combo were it 60fts & 330ft's well/the best,
IMO the 1st 60ft-330ft is were the biggest changes/improvements in et will be achieved
take out the timing on the big end,
that way you 60ft well & MPH well,
so you can run down people that are out on ya' a couple seconds, like Bobtile
depends on what your specific comb likes
gear, tire size, wheel speed & converter will effect it too
way too many variables
your RacePak should help you determine
where's the best place or RPM to start pulling it back,
where it's dropping off, if you can do some back to back comparison runs,
one with 35*'s the next 34* then 33* then with 32*'s, compare graphs,
preferably with similar weather, sun or cloud cover & track prep conditions
you maybe able to go even more ignition timing like 36*-38*'s
& back it out in more {shorter} incremental,
if that's what your specific engine/car combo likes
what does your engine builder say to do ?
he should know what your combo can or should be able to handle
IMO with a high compression combo
I'd be shutting it down clean, right after the traps
& then reading the plugs after every run,
not idle/cruise around & getting false plug readings after a run
{tow it back to the pits if you have too a couple times, so you get a clean reading}
even running a leak down test to make sure your not hurting something
too lean or detonating the crap out it, just be safe...
I know you must already know all this stuff,
must be testing/messing with us or something...LOL
but what do I know...LOL
good luck, have fun
