So, I've tried the only tune on the web for the Tempest (https://www.gtplanet.net/forum/showthread.php?t=163990) but it wasn't quite doing it for me, in fact it was really terrible at least for what I was doing. It was my highest HP car (727) for the Historic Racing Car Cup.
So I tuned it running practice at the Deep Forest Raceway, best time was 1:22.691 but I could easily do better if I tried to do it perfect. I'm not sure how else I can improve it, but I still only got 7th in the race x) I think I'll save up for the Ferrari 330 P4 Race Car '67.
Well here are the fruits of my labor:
Equipped:
Body/Chasis:
Weight Reduction: Stage 3
Chassis Reinforcement
Window Weight Reduction
Engine:
Engine Tuning: Stage 3
ECU Tuning
Intake System:
Sports Intake Manifold
Racing Air Filter
Exhaust:
Titanium Racing Exhaust
Sports Exhaust Manifold
Catalytic Converter: Sports
Turbo Kits:
Supercharger
Transmission:
Fully Customizable Transmission
Drivetrain:
Clutch: Twin Plate
Flywheel: Semi Racing
Carbon Drive Shaft
Adjustable LSD
Suspension:
Fully Customizable Kit
Tires:
Racing: Soft
Tune:
Ballast:
Ballast Amount (kg): 163
Ballast Position: 30
Transmission:
Top Speed: 186
1st Gear: 3.175
2nd Gear: 1.732
3rd Gear: 1.226
4th Gear: 0.919
5th Gear: 0.730
Final Gear: 4.000
Adjustable LSD:
Initial Torque: 22
Acceleration Sensitivity: 40
Braking Sensitivity: 15
Suspension:
Ride Height: -20/-18
Spring Rate: 8.0/5.5
Dampers (Extension): 6/6
Dampers (Compression): 5/5
Anti-Roll Bars: 4/3
Wheel Alignmet:
Camber Angle: 2.0/1.8
Toe Angle: 0.35/0.35
Brake Balance:
8/10
Let me know how it goes, and if you have an improvement or beat my time and what not.
So I tuned it running practice at the Deep Forest Raceway, best time was 1:22.691 but I could easily do better if I tried to do it perfect. I'm not sure how else I can improve it, but I still only got 7th in the race x) I think I'll save up for the Ferrari 330 P4 Race Car '67.
Well here are the fruits of my labor:
Equipped:
Body/Chasis:
Weight Reduction: Stage 3
Chassis Reinforcement
Window Weight Reduction
Engine:
Engine Tuning: Stage 3
ECU Tuning
Intake System:
Sports Intake Manifold
Racing Air Filter
Exhaust:
Titanium Racing Exhaust
Sports Exhaust Manifold
Catalytic Converter: Sports
Turbo Kits:
Supercharger
Transmission:
Fully Customizable Transmission
Drivetrain:
Clutch: Twin Plate
Flywheel: Semi Racing
Carbon Drive Shaft
Adjustable LSD
Suspension:
Fully Customizable Kit
Tires:
Racing: Soft
Tune:
Ballast:
Ballast Amount (kg): 163
Ballast Position: 30
Transmission:
Top Speed: 186
1st Gear: 3.175
2nd Gear: 1.732
3rd Gear: 1.226
4th Gear: 0.919
5th Gear: 0.730
Final Gear: 4.000
Adjustable LSD:
Initial Torque: 22
Acceleration Sensitivity: 40
Braking Sensitivity: 15
Suspension:
Ride Height: -20/-18
Spring Rate: 8.0/5.5
Dampers (Extension): 6/6
Dampers (Compression): 5/5
Anti-Roll Bars: 4/3
Wheel Alignmet:
Camber Angle: 2.0/1.8
Toe Angle: 0.35/0.35
Brake Balance:
8/10
Let me know how it goes, and if you have an improvement or beat my time and what not.
Result for my very first lap in the GTO resulted in a time on 1:20.004, i think i could squeeze a little more out of it but im happy with it. Let me know if you want the improved gear ratios 
