The trail braking with welded diff is probably the cause of most of
the corner entry push. Try getting all the braking done before entry.
Use a lot of throttle with entry and a slightly late apex at first,
adjust apex as dictated by oversteer/ understeer balance.
Going to solid front suspension bushings (or almost solid with a VERY thin
layer of teflon) might help some too. On a rough track, try loosening up
the
front sway bar a little.
art de armond
-----Original Message-----
From: Scott Janzen
Sent: Tuesday, January 24, 2012 9:11 AM
To: Bobby Whitehead
Cc: 'Friends of Triumph' Triumph
Subject: [Fot] GT6 Alignment and suspension set-up
Bobby, I'll share how my suspension is set up, describe the handling, and
pose a question of the group - what would optimize the handling/reduce
understeer on corner entry?
Car weight roughly 2100 lb w/ fuel, 200 lb driver/gear, corner weighted to
optimize, but LF is still heaviest
Tires 205/60-13 on 6" wheels, R888 Toyo Proxes, 21 psi front, 19 rear
Front Susp 550 lb springs, 1.5 degrees negative camber. Tried 2.5 negative
on last outing, and got more even tire wear (less wear on outer 25%) but
more twitchy steering and no reduction in understeer. Front bar 1" OD,
solid, with about 13.5" lever arm. 1/16-1/8" toe out. All plastic bushings.
Rear Susp: stock spring(I think), with spacer on diff to lower about 3/4", 1
degree negative camber, 1/16" toe-in, 5/8" OD anti-roll bar with 9" lever
arm. Welded diff. Every connection on "stock" rear susp elements is a rod
end except for the lower a-arm connections to the upright, full IRS w/
rotoflex replaced by ujoints.
The car understeers on corner entry, more as I go faster, and more on
tighter turns (welded diff). Jason tells me it's my driving style - I carry
a lot of speed into the corners, trail braking, and the car pushes going in,
can hear the front tires protesting. At the apex, when I get on the gas, the
balance shifts rearward, the front tires get quiet, the backs start making
noise and the car points where I want it to go.
I'd like to reduce the understeer on turn-in. Have increased the rear bar
stiffness, which did not reduce understeer but made the transition to
oversteer more dramatic! Adjusting tire pressures up and down has not made
a material difference.
So, anything else I should try adjusting? Or, just acknowledge the nose
heavy nature of the car and get my braking done in a straight line, go slow
on entry and get on the gas early?
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