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Old 06-09-2010, 11:58 AM   #1
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Red face Poll: Chassis Setups

Wanted to start a poll of everyone tracking their Miatas regarding their chassis setups. Might help some of us further tune our chassis' for optimal performance.

Here is a format I think is beneficial. (This is not data for my car - it is just an example for the format) Please note what track your setup is primarily configured for. Feel free to add any other information you feel is necessary.

Year: 1991
Weight (w/Driver and 1/2 tank): 2355lbs (48%/52%)
Power: 287rwhp
Springs: 500lbs (F), 300lbs (R)
Dampers: Koni re-valved, FM Bumpstops
Front Bar: Tubular 1.125" Racing Beat
Rear Bar: 5/8" adjustable
End Links: OEM
Diff: GURU lsd
Bushings: Energy Polyurethane
Wheels: Kosei K1 15"x7"
Tires: Victoracer V700 205/50/15
Camber: -1.5 (F), -1.0 (R)
Toe: 1/8" (F), 1/8" (R)
Front Caster: 5.2 degrees
Ride Heights: 11.5" (F), 12.0" (R)
Stiffening: HDDD, Door Bars, Strut bar, Hardtop
Front Aero: GV lip with 4" Splitter
Rear Aero: GTC-200 @ 10 degrees
Brakes: Corrado BBK (F), Miata R (R) - Hawk Blue
Track: Mid-Ohio
Lap: 1:38 @ Vavg of 88.2mph
Notes: 5-speed, 3.9, GT3071R

Please add your setup below!
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Old 06-09-2010, 12:46 PM   #2
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Year: 1991
Weight (w/Driver and full tank): 2519lb (eek!)
Power: 254rwhp
Springs: 550lbs (F), 375lbs (R)
Dampers: Tein flex twin tube
Front Bar: Tubular 1.125" Racing Beat
Rear Bar: stock
End Links: heim
Diff: torsen 1
Bushings: 20-year old stockers
Wheels: 15x9 6UL
Tires: 225/45/15 ntw-01
Camber: -2.5 (F), -2.75 (R)
Toe: 0" (F), 0" (R)
Front Caster: 3.5 degrees
Ride Heights: 4.25", 4.5" at the pinch welds
Stiffening: roll bar and door bars
Front Aero: none
Rear Aero: Gnone
Brakes: Trackspeed fronts with RB rotors, 1.8 rear, Hawk DTC-60, FM valve
Track: MSR-C
Lap: 1:24.CW
Notes: I'm "dating" your sister.

Last edited by hustler; 06-09-2010 at 12:56 PM.
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Old 06-09-2010, 12:57 PM   #3
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Year: 1994
Weight (w/Driver and full tank): 2700lb (estimated)
Power: 300rwhp - LS1 conversion
Springs: 700lbs (F), 450lbs (R)
Dampers: Koni Race f&r
Front Bar: Tubular 1.125" Racing Beat
Rear Bar: stock
End Links: 949Racing front, stock rear
Diff: TrueTrac (Ford 8.8)
Bushings: Fresh Energy Suspension poly bushings
Wheels: 15x8 6UL
Tires: 225/45/15 Nitto NT-01
Camber: -2.0 (F), -2.3 (R) IIRC
Toe: 0" (F), 0" (R)
Front Caster: ~3.5 degrees
Ride Heights: 12" front, 12.25" rear
Stiffening: roll bar
Front Aero: DIY air dam and splitter, vented hood
Rear Aero: APR GT dual-element wing with DIY end plates
Brakes: Corrado front, sport rear
Lap: Slow, still trying to get the car (and the driver) dialed in
Notes: T56 trans, 3.53 diff ratio, engine oil cooler with thermostat.
All your sisters are belong to us.

Last edited by ZX-Tex; 06-09-2010 at 02:47 PM.
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Old 06-09-2010, 01:44 PM   #4
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Year: 1990
Weight (w/Driver and 1/2 tank): ~2600 lbs. (still a street car too and I’m a lardass)
Power: 356rwhp
Springs: 700lbs (F), 400lbs (R)
Dampers: Koni sport re-valved, Custom Spherical ball tops with NB bump stops
Front Bar: ISC-racing 1.25”X1/4” wall
Rear Bar: ISC=racing 5/8”
End Links: Spherical
Diff: Torsen type II
Bushings: Super Pro Polyurethane
Wheels: 949 racing 15X9”, used with 15mm spacers
Tires: 225/45/15 Nitto NT-01
Camber: -2.8(F), -2.5 (R)
Toe: 0" (F), 0" (R)
Front Caster: 4 degrees
Ride Heights: 11.25" (F), 11.75" (R)
Stiffening: HDHCSD, Door Bars, Strut bar, Hardtop, FM frame rails, rear underbody brace, fully seam welded, +under fender braces.
Front Aero: GV lip with 3.5" Splitter Canards and wheel spats. Modified Erebuni vented hood.
Rear Aero: GTC-200 @ 10 degrees, double 2.5” risers, Simpson rear bumper and trunk lip.
Brakes: 11.75” willwood Dynapro Mini Cooper Front, 11.5”custom rears with stock relocated calipers. Cobalt friction XR2 pads F&R.
Track: Pacific Raceways
Lap: 1:34.6
Notes: currently with 6-speed, 3.9, GT3071R, 2.0L
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Old 06-09-2010, 03:45 PM   #5
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Year: 2002
Weight (w/Driver and 1/2 tank): 2600
Power: Stock
Springs: 450lbs (F), 325lbs (R)
Dampers: FCM non-adjustable
Front Bar: Flyin Miata on soft
Rear Bar: OEM
End Links: 949 racing
Diff: OEM
Bushings: OEM
Wheels: 6UL 15"x8"
Tires: Bridgestone RE-11 205/50/15
Camber: -1.5 (F), -1.5 (R)
Toe: 0" (F), 0" (R)
Front Caster: 4.5 degrees
Ride Heights: 12.75" (F), 13.0" (R)
Stiffening: HDDD,Door Bars,Hardtop
Front Aero: None
Rear Aero: None
Brakes: OEM Sports brakes
Note: I need more crap
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Old 06-12-2010, 04:12 AM   #6
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Default 949 Racing Rental & OGK

Rental
Year: 99
Weight empty: 2140
Power: 160whp n/a
Springs: Hyperco 2.25" 700/400 with 150# tenders
Dampers: Xida double adjustable, remote reservoir
Front Bar: Tubular 1.125" Racing Beat
Rear Bar: 14mm Mazdaspeed
Bushings: Energy Suspension & diff mounts
End Links: 949 Racing
Diff: Torsen
Wheels: 15x9 6UL
Tires: 225/45 Nitto NT01
Camber: -2.9F/2.6R, zero toe all around
Ride Heights: 4.1"F/4.4"R (pinch weld)
HDHCHTDD
No aero
Brakes: Carbotech XP10/XP8, plain OEM replacement rotors, brake ducts
6x4.3
Car is consistently 2-3 sec under Spec Miata lap records at every track in California

OGK
Year: 91
Weight empty: 1950
Power: 300whp Kraftwerks Rotrex, Whammy 2.0 engine
Springs: Hyperco 2.25" 800/500 with 150# tenders
Dampers: Xida double adjustable, remote reservoir
Tubular control arms
Tubular front subframe with NB geometry
949 Racing drop spindles
Billet aluminum front hubs
Billet steel custom rear hubs
Front Bar: Tubular 1.125" Racing Beat
Rear Bar: 14mm Mazdaspeed
Bushings: Energy Suspension & diff mounts
End Links: 949 Racing
Diff: OS Giken
Wheels: 15x9 6UL
Tires: 225/45 Nitto NT01
Camber: -2.9F/2.6R, zero toe all around
Ride Heights: 4.1"F/4.4"R (pinch weld)
Miatacage full cage with curved dash bar
Full under tray
Custom diffuser
Dive planes
GTC300 rear wing
Autokonexion fast back
Autokonexion custom nose
Auokonexion Kevlar/FRP 30mm fenders
Brakes: 11.75", Wilwood DP6 front, DL4 rear Carbotech XP12, cockpit adjustable prop valve, manual brake (no booster), Wilwood master cylinder, brake ducts
6x3.9
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Old 06-18-2010, 02:04 PM   #7
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Surprising how I ended up at the very similar suspension settings to Emillio and I arrived at those settings pretty much on my own by trial and error with mostly seat of the pants testing.

I also got a chance to drive the 949 Rental back to back in the same session as I drove my car in at Laguna to compare.

Here is my observation.

1. The Xida are in a whole nother league as far as damping performance than my old and tired Koni. My Koni gave the car a dead feel with much slower response. The Xida were more lively and the car was more responsive and it really felt more like the tires were connected by an inseparable force to the road over slight ripples, FIA curbing, and unweighted situations.

2. The other thing I noticed is the rental would rotate on throttle much more easily than mine. Very controllable, im not a drifter but I felt like I could force this car into a nice controllable power drift. I liked the way it felt but I was not sure it was faster that way because my car with a slight bit more push I felt I was able to add a more throttle earlier coming off corners without stepping sidways and I know that is fast. I do not know what caused this difference in feel for sure but my car had more aero with a GTC200 wing and a splitter, different sway bars and different damping, could be any of those things.

Bob

Last edited by bbundy; 06-18-2010 at 02:25 PM.
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