30 November 2009

Lexus IS200 Touring Car

IS 200 (J) Touring Car



Power: 274bhp

Parts:
Weight Reduction Stage 3
Rigidity Increase (rollcage)
Port Polishing
Racing Exhaust
Racing Brakes
NA Tuning Stage 1
Computer Equip
FC Transmission
Triple-plate Clutch
Racing Flywheel
FC LSD
Carbon Driveshaft
FC Suspension
R1 Tires
Rear Wing

Suspension:
Spring Rate: 9.5/9.5
Ride Height: 96/96
Bound: 4/3
Rebound: 6/5
Camber: 2.0/2.4
Toe: 0/0
Stabilizers: 4/3

Transmission (set the transmission in the order that is listed):
Autoset: 7
1st: 3.500
2nd: 2.440
3rd: 1.840
4th: 1.470
5th: 1.205
6th: 1.000
Final Gear: 3.700

LSD:
Initial: 12
Acceleration: 30
Deceleration: 12

Downforce:
16/22

Ballast:
Ballast weight: 31kg
Location: 36

Notes:
This car as it is built here better fits the current S2000 rules than our previous build the Honda Accord Euro-R touring car. Here are some of the specs (from the "sell" clipboard):

Power: 270bhp
Torque: 281Nm
Weight: 1170kg (30kg ballast added for the use of a six speed sequential gearbox)
Body: 4.4m length, 4-door
Engine: 2L inline 4, 8500rpm rev limit

I did a lot of research into the gearing of this car. To avoid the weight handicap placed on the transmission, a 5 speed gearbox must be used with original gear ratios. With the final gear adjusted for the same top speed as the 6 speed, and the original gearing, this was the setup:

1st: 3.520
2nd: 2.180
3rd: 1.490
4th: 1.210
5th: 1.000
Final Gear: 3.700

I did a drag race between both setups over 1km and found that the setups were nearly equal; the 5 speed gearbox was only 0.1 seconds slower. Based on this result I would say that the transmission should be decided based on the course and not so much the car, so honestly the choice is yours. (Remember to remove the 30kg handicap if you use the 5 speed).

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