Quote:
Originally Posted by robispec
OK some real world experiances
Mods FULL Borla ELH exhaust(engine back) no diffuser
Robispec cold air.
Grill master front Grill.
Enkei RPF! 17x9+45 with front on 15mm spacers
Hankook RS3's 245/40/17
Robispec front lower control arms which allow the roll center bump ateer track and anti dive/ camber to be adjusted/corrected
KW coilovers
4 wheel BBK
Car lowered 77mm(3")
Car weight without fuel 2380 Front 57.5% (yes thats right).
Track day at WSIR big track turns 1,2, are 4th 6500 and accellerating 8&9 are flat in 5th @ 7k and 5th @ 5800 @ apex (best lap) at the begining of the day these #'s were not possible because the car was "AERO LOOSE"
taping off 80% of the front grill opening(no change in coolent temps) MY LOUVERS WORK GREAT!
Filling up the gas tank at the start of each run
and adding 50 lbs of Ballast in the spare tire well cured the looseness and made the car easier to drive at all speeds
these weight additions changed the Nose weight % back to 55%
top speeds were 119. Best time was 1:35.083
It's funny because a FI car was there 2800 lbs total weight (58% front)
Full 275/35/18 c-91 hankook slicks
4 wheel BBK
Coilovers
BRZ wing (it's so cute!)
Basicly the same mods but add Turbo sauce.
He ran a 1:34.430 Less than a second faster with DOUBLE the WHP
and talking with him He has the same complaint of the back of the car being very touchy! Even with the extra grip.
So rear down force will be VERY important as we figure out how to get this chassis optomized for the tRACK
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I'm a bit disappointed that I didn't go now. Spent the day mulling over the events of the weekend and possible courses of action.
I didn't think the car was loose at WSIR, but I was also driving a heavily understeer biased setup at the time. Hopefully we'll have another opportunity to visit WSIR soon to do some experimenting with aero.
Now you know why half that front opening is faux from the factory! :p
IIRC, my Vmax was higher when I ran. I'd speculate lower rolling resistance and aero drag from smaller/higher offset wheels with smaller tires...
I believe I was running a muffler delete rather than an axleback at the time too, but the car was so pushy that I never noticed the rear getting loose...