GT Acadamy 370Z Cup Car

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warner robins ga
holtzy08si
Reference: http://www.nissanusa.com/gtacademyshow/cars
Nissan 370Z GTA cup car 2009 specs: I suspect the HP and Torque was done on a chassis Dyno so to account for drive line power loss I added 10% to the numbers from the website.
Specs
Engine: 3.7L V6
Horsepower: 332 hp plus 10%= 365 hp
Torque: 270 lb-ft plus 10%= 297 lb-ft
Drivetrain: rear-wheel drive
Transmission: 6-speed manual
Racing mods: rollcage, Recaro® pro racer seat, NISMO® rear differential, racing brake pads
POWER TO WEIGHT RATIO
It's pretty simple, really - the lighter the car, the faster it goes. The 370Z® has a wicked power-to-weight ratio of 9.87 lb/hp. Okay, what does that mean exactly? The car weighs in at 3278 pounds. Divide that weight by the number of horses under the hood, 332, and you have the power-to-weight ratio: 9.87lb/hp. Put simply, for every 9.87 pounds of car, there is one horsepower. Or, to look at it another way, every horse under the hood is pushing 9.87 pounds of Z®. It's a low number, and in this case, the lower the better.
TRANSMISSION
6-SPEEDS, OR 6 WAYS TO SEPARATE THE MEN FROM THE BOYS. Now to get this thing really going, you need to know what you're doing. This 370Z® here has a manual transmission. Any GT Academy drivers that didn't know how to drive a stick shift when they got here had to learn quick, because you need to know exactly when to shift that stick to get the most out of the car.
ENGINE
WE TINKERED. WE TRIED. BUT IN THE END, WE COULDN'T IMPROVE THIS ENGINE. We've been building the Z® for more than 40 years now, and 40 years gives you a lot of time to develop something that is pretty special.We dropped a 3.7-liter V6 in this latest one. 332 horsepower, 270 lb-ft of torque and all that other stuff you read about engines, it has all that. The point of this engine, the point of this whole car, is that it goes fast. It accelerates fast. It goes around corners fast. It tops out really fast. It even stops fast. So be careful.
BRAKING
The bigger the brakes, the quicker you'll stop. It's really that simple. We slapped on the biggest brake rotors a Z® has ever seen – they are 14-inches up front, and they are matched with powerful 4-caliper Nissan brake pads.The whole set-up is designed to slow you (and the 18" Compomotive aluminum alloy wheels) down in a big hurry, and when you can slow down in a hurry, you can also stay on the gas longer. It only makes sense – the less time you spend slowing down, the more time you can spend going fast. Lap-times go down, and the good times roll.
SUSPENSION
When you reduce unsprung weight, you increase the responsiveness of the suspension. So it's lighter, it's quicker, and it all makes the car go faster. So how did we do it? With a ruthless approach to dead weight. Instead of using conventional materials, the suspension parts are high-strength, light-weight aluminum. (We also actually reduced the weight of stuff like the radio, but that's a different story).The whole thing is more than just lightweight though. With an underbody V brace and under-hood 3-point strut tower giving it plenty of stiffness, you get a crisp, performance-first ride.
WEIGHT DISTRIBUTION
Your average car has a weight distribution of 50 in the front and 50 in the back. The 370Z®, of course, isn't your average car. Its weight is skewed to 53 in the front and 47 in the back, meaning it accelerates faster out of a turn. At the precise moment the 370Z® driver hits the gas on the way out of a corner, the weight distribution shifts to the back, giving you a nearly perfect 50/50 dynamic weight balance exactly when you need it most.
WEIGHT REDUCTION
WE SENT THE 370Z® TO THE FAT FARM. THIS IS WHAT CAME BACK. Passengers? Where we're going, we don't need passengers. The 370Z® Cup was designed for one thing – to go fast – so we needed to lighten things up, literally.This isn't the kind of ride that needs much in the way of creature comfort, so the first thing we did was pull out the stock Z® front seats and replaced them with just one - a Recaro® Pro Racer performance seat. And the drivers will be strapping in with a Willans 3" 6-point race harness. So now the passenger seat is gone. Next to go were the interior door panels, center console and even the upholstery on the ceiling. The dash was heavily modified for weight and to accommodate the rollcage. Finally, we swapped out the stock steering wheel for a lightweight, quick-release wheel built by Racetech.

THE TUNE

I added a sport exhaust and a isometric exhaust manifold to get the HP and Torque Numbers to match the 10% added to the figures from the website. The reason this was done was to get the HP and torque ratio to line up, otherwise there was more torque to hp ratio.


Specs
Engine:
3.7L V6
Horsepower: 365 hp
Torque: 297 lb-ft
Drivetrain: rear-wheel drive
Transmission: Set to the (GT-5) Nissan 370Z (GT ACADEMY) '08 prize car Specs
Racing mods: To account for roll cage Improved Body rigidity in Pit Service was installed, I used the Fairlady Z Z-tuned (Z33)'03 to account for the NISMO rear differential, and increased break balance to Front 7 and rear 6 to account for racing brake pads.

POWER TO WEIGHT RATIO
Weight:
3278 LBS = 1487 KG
Horsepower: 365 hp

Torque: 297 lb-ft
power-to-weight ratio: 9.87lb/hp = 4.47kg/hp
subtract 10% for actual power-to-weight: 4.07 kg/hp

TRANSMISSION
From the (GT-5) Nissan 370Z (GT ACADEMY) '08 prize car
:
Trans Gearing:
Set top speed to 205 then set the gears.
1) 3.794
2) 2.324
3) 1.624
4) 1.271
5) 1.000
6) 0.794
Final) 3.692

NISMO Rear Diff:

(Sports Hard Tires)

From the (GT-5) Nissan 370Z (GT ACADEMY) '08 prize car, Opera 350Z '04 and the Gran Tourismo 350Z RS (This just also happens to be the settings for the stock Diff) 50/80/--

(Sports Soft Tires)

From the NISMO 380RS Super Leggera: 7/35/15
From the Fairlady Z Z-tuned (Z33)'03: 7/30/15

ENGINE

After doing an oil change, adding the sport exhaust, and the isometric exhaust manifold I moved the power limiter to 98.7% to get the HP and Torque Numbers to match the adjusted figures. 332 hp+10%= 365 hp 270 lb-ft+10%= 297 lb-ft

BRAKING

increased break balance to Front 7 and rear 6 to account for racing brake.

SUSPENSION
(Sports Hard Tires)

From the (GT-5) Nissan 370Z (GT ACADEMY) '08 prize car:
Spring rate:
Front) 6.02 Rear) 6.0
Dampers/C&E/ARB: All set to 3 front and rear
with the above settings good throttle control is a must on sports hard tires. its easy to induce wheel spin when coming out of a corner if you just hammer it.

(Sports Soft Tires)
From the Fairlady Z Z-tuned (Z33)'03:
Ride Heigth: 70 in. front and rear
Spring Rate: Front) 13.35 Rear) 13.12
Dampers/C&E/ARB: All set to 3 front and rear
Camber: Front) 1.0 Rear) 0.5
these settings are too harsh for Sports Hard tires, great with Sports Soft though!

WEIGHT DISTRIBUTION and WEIGHT REDUCTION

Weight reduction stage 2, window weight reduction, and adding 197 kg to position -3 was used to account for weight numbers on website.
 
That's the SAE standard, but when race teams build their cars for the most part the will dyno their cars. plus the only way I could get the numbers to line up correctly was to add the 10% otherwise there would be too much Torque for the Horse Power.
 
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