Chevrolet Camaro Z/28 2014/2015
Tuned to replicate Camaro Z/28
Randy Pobst Lap Record at Laguna Seca
MotorTrend Best Driver's Car November 2014 Champion
Sports Hard / Pirelli P Zero Trofeo R
CAR : Chevrolet Camaro SS '10
Tire : Sports Hard
Specs - No Fuel Weight
Horsepower: 505 HP at 6100 RPM
Torque : 481.1 ft-lb at 5000 RPM
Power Limiter at : 95.6%
Weight: 1700 kg
Ballast : 189 kg
Ballast Position : -50
Weight Distribution : 53 / 47 - as in real life spec.
Performance Points:
525
GT AUTO
NO Oil change
Improve Body Rigidity (
NOT INSTALLED IN THIS BUILD )
Aero Kits Type B
Rear Wing : Custom Wing Type A
Wheels : Standard Size ENKEI RP03 in Black or Dark Gray Matte
Car Paint : Black or Silver or Red
Tuning Parts Installed :
Engine Tuning Stage 1
Sports Computer
Semi Racing Exhaust
Intake Tuning
Adjustable LSD
Fully Customizable Suspension
Weight Reduction Stage 1
Carbon Hood ( Body Color )
Window Weight Reduction
Suspension - Z/28 Special Suspension Pack ( Track Spec Springs / MultiMatic DSSV Spool Valve Damper )
Personal Alignment + Visual Ride Height of MotorTrend Z/28
Front, Rear
Ride Height: 150 140
Spring Rate: 5.46 10.90
Dampers (Compression): 5 5
Dampers (Extension): 7 7
Anti-Roll Bars: 4 5
Camber Angle: 2.5 0.5
Toe Angle: 0.20 0.20
Alternative Lower Ride Height
Suspension - Z/28 Special Suspension Pack ( Track Spec Springs / MultiMatic DSSV Spool Valve Damper )
Personal Alignment
Front, Rear
Ride Height: 120 120
Spring Rate: 5.46 10.90
Dampers (Compression): 5 5
Dampers (Extension): 7 7
Anti-Roll Bars: 4 5
Camber Angle: 2.5 0.5
Toe Angle: 0.20 0.20
Alternative Street Alignment
Camber Angle: 0.9 0.7
Toe Angle: 0.17 0.17
Alternative Street/Track Alignment
Camber Angle: 1.4 0.9
Toe Angle: 0.17 0.17
Alternative Aggressive Track Alignment
Camber Angle: 2.2 1.5
Toe Angle: 0.17 0.33
DOG CLUTCH TRANSMISSION - Tremec TR6060 Close Ratio 3.910 Final
Set Default
Set Final to 3.910
Set Auto Max Speed at 410kmh / 255mph
Adjust each gear :
1st 2.660
2nd 1.780
3rd 1.300
4th 1.000
5th 0.740
6th 0.500
Set Final : 3.910
DOG CLUTCH TRANSMISSION - Tremec TR6060 Close Ratio
OPTIONAL CORRECTED FINAL FOR 19" WHEEL
Set Default
Set Final to 3.910
Set Auto Max Speed at 410kmh / 255mph
Adjust each gear :
1st 2.660
2nd 1.780
3rd 1.300
4th 1.000
5th 0.740
6th 0.500
Set Final : 4.210 ( Adjusted Final to account for real life 19" wheel )
LSD - Camaro Z/28 Custom Torsen LSD ( Zero Preload )
Initial Torque : 7
Acceleration Sensitivity: 30
Braking Sensitivity: 7
AERO
Rear : 20 ( Max )
Brake Balance:
7/9 ( personal BB) or for ABS 0 wheel : 5/7, for ABS 1 - feel free to use your preferred brake balance. I recommend to run 1 click higher at the rear.
Recommended setting for DS3 user :
Steering sensitivity at +1 or +2, all aids off, except ABS 1 ( if not comfortable with ABS 0 )
with 7/9 brake balance as starting point. Go higher if preferred, 8/10 for example.
Notes :
We have ZL1 Camaro, and now an even meaner version arrived, the Camaro Z/28, a track bred racer in disguise for the street 
The Camaro Engineers went all out in tuning up the car, from power, chassis, driveline, tires and aero. It has only one speaker, A/C optional, no sound insulation, lightweight rear seats, thinner rear glass window and lighter engine. The wheels goes smaller in diameter size at 19" to get the car lowered, this also results in less rotating mass with lighter wheels.
Both front and rear use 305 tires / 11" wide wheel, a special tire only used on this car, super sticky Pirelli P Zero Trofeo R tire, a street legal tire with 60 treadwear rating.
For power, the Camaro received a great transplant in the form of a hand built race engine LS7 V8 from C6 Z06 with 505HP on tap and just over 480lb ft torque. It may be not much, but power is not everything. Weight has been shaved a lot from the ZL1 version ( +4120lb ), with test curb weight at 3858lb / 1750kg, about 300lb difference. I have used no fuel weight for this replica. The Camaro Z/28 has 19 US gallon fuel tank, that will be 72 liters of fuel and about 50kg weight. The weight of this replica is at 1700kg, with 53/47 distribution of the real car replicated. It's a compromise as the full curb weight can't be achieved with 53/47 distribution.
Suspension received entensive improvements, the front springs are 85% stiffer, while the rear springs are 65% stiffer than from SS springs. This equates to approximately 305.3lb/in or 5.46kg/mm for the front spring and 610.5lb/in or 9.10kg/mm rear spring. With stiffer springs, the anti roll bars are now smaller. The damper/ shocks also has been revolutionized with exclusive MultiMatic DSSV Spool Valves as used in F1, this offers exceptional damping over high and low speed. I have tuned the damper at medium stiffness to over damping, while ARB at medium to give less resistance and work with the springs better. For the alignment, I have adapted Pfadt Race Engineering Recommended Track Setup, the setup uses front/rear toe in, good amount of camber front.
For transmission, the real car uses Tremec TR6060 Close Ratio, the same ratio used on the 1LE. The gearing for this replica comes in 2 setup, one with 3.910 final as in real car, and another one with 4.210 ( adjusted final to account for 19" wheel of the real car ). The Camaro SS in GT6 comes with 20" wheel, so a higher final included to reach same max speed on each gear when 19" wheel installed ( Z/28 ).
The Z/28 uses specific build rear torsen LSD with zero preload and good amount of locking action. This is in contrast to SS and ZL1 which uses spring-loaded clutch based LSD. The design choice it to give the Z/28 very rapid turn in to hit the apex consistently, while on power out from low speed, the rear will lock, and with the 481 torque, the rear can break loose with heavy foot. The LSD also offers good balance between low speed lock up and less lock / more open on high speed range. To achieve this character, I used very low preload and medium lock, the LSD setup in GT6 gives nice balance on SH tire.
The Z/28 also received aero upgrades, from front splitter, rocker panel mouldings, rear diffuser, small rear wing and small front & rear fender lips. The Camaro SS produces 200 pound of lift at 150mph, this aero package gives some downforce at the rear to improve stability. There is also an optional Gurney Flap for the rear wing that will add more downforce. The aero package of Z/28 produces 150 pound of force at high speed.
The tire of 1LE and Zl1, Eagle F1 Supercar GII was predictable and progressive, the very high grip Pirelli Trofeo R on the other hand will be more sudden when loses traction. The Tire in GT6 is Sports Hard, the SH tire achieved similar peak cornering G's when driven at the same track as the MotorTrend Best Driver's Car 2014 : Laguna Seca.
The Camaro Z/28 won the 2014 MotorTrend Best Driver's Car, Randy Pobst, the test driver, did a great lap at Laguna Seca, posting 1:37.82. Here is a quote of what Randy has to say about the Z/28 at Laguna Seca :
I have included the lap time data, with peak G's and highest speed before braking as well as a video of the run. A replay of my run with the replica also provided, and both can be compared against the video below.
Check out the peak G's throughout the track, also particularly the last half of the track ( after corkscrew ) and top speed on each braking points. My time was 1:36.821, 00.999 quicker 
, this of course because a few mph difference in top speed on some braking points. The peak G's are almost dead on on most corners, the highest peak G's of the real lap is 1.72 also replicated. Watch the Youtube video and replay together I'm sure with more laps, Mr. Randy Pobst would also be in 1:36s 
Personally, in my opinion, the Z28 tire in GT6 should be somewhere in between Comfort Soft and Sports Hard, but that's not possible.
The replay of my lap was done on 3.910 Final + Lower Ride Height, a must watch to appreciate how close the replica in terms of performance
ENJOY 
Too bad, I don't think I can watch the replay on 1.09, as far as I know, replay files are only backward compatible, meaning later version can view replays from older version, but not the other way around. K. Tsuchiya has been my driver name since I got GT6 
It is a great idea, and Jordan has worked alot on it, I'm sure.
Sorting those link codes 
