Since charge temps dont get high enuff at only 98% on a screw, & u get to choose where to add the 100lbs we assume?
You will likely get your front & rear weight % disperity much greater to optimum,
Per ea race track, & all weather conditions, w/ the extra 100 lbs,
& adding 23% more O/D
Which = 14% more cubic inch of swept volume @ 9000rpms)
Which should increase your boost level by nearly 1/2 of 1 atmosphere.
& by the C rotors tip speed is being way under the discharge " hi temp threshold" of about 115%+ o/d, for C rotor,
Your boost & lack of temp increase should far exceed the same benifits vs, say a a Roots deal w/ same the same rules/boundarys applied, % wise.
The Roots exit speed from its discharge hole, say just a 60 degree rotor 14/71, @ 8000 rpms is Mach 1.7 air speed
The Screw, @ 8000, is less that Mach .7 air speed discharge out the discharge hole.
the extra OD just never creates the negative resultant w/ speed increase at rotor tips,
as the roots style would have,
vs a Lycolm screw design.
From a Chassis setup Standpoint, I would think hard about taking the 23% increase & having to carry +100lbs for 660ft,
vs old school 1320 ft.
@,1320 ft, thats when the xtra wt is wrking against u most, w/o benifit of gear ratio,
Like u have w/ 3spd to only 660ft,
Your increased gear ratio between the 660ft window (vs th 1320 window)
keeps the additional +100 lbs under higher acceleration rates @a greater mechanical advantage, assuming your running the @660ft only, & not any 1320 ft stuff...???
w/ the additional boost levels of about 14% cu in increase, at 9k rpms @ 98% vs 75% o/d .....
When you dont have to run that
long back half,
of the 1320ft track, like the old days, is pretty significant.
From a chassis setup standpoint,
If u Carry the +100 lbs xtra, & do it your way, or the most advantageous way, meaning,
"Exactly Where u need it",
On any given race day,
or on "an exact run", under varied conditions of:
(Day time, nite time, Sun, greasy, tite--
W/ Track temps varying of 145°f to below 65°f)
It may appear your ahead w/98%,
unless all tracks u run are stellar air,
& good wheel speed bite,
&, LASTLY, & MOST IMPORTANT,
your frt & rear wt % are ideal at all times for your wheel speeds at .25- .5, &.75 seconds into the run.
Which it sounds like they probably are pretty good already if your running cinsistantly @ 3.70s?
More info needed, but i would look hard at making the +100 wrk for me, & if it will not,
U start w/75%, & try the 98% setup midyr
Good luck!
Just remember,
Any free info is usually no good,
But sometimes you need opinions to open areas of the mind to help see things you never took into account before,
Vs the actual answer you received.
"You learn more from the question of a Fool,
Than the answer from a wise man"
(Bruce Lee, martial artist extraordinaire)
