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I Built A Hypercar In My Shed
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Mar 29, 2025
A TALENTED mechanic has built Australia’s first 'hyper car' – in his shed. The Quantum GP700 was born out of the seven-year passion project of its creator, Jeff David. Aimed at producing breathtaking performance in a road legal car – the Quantum can reach 0-60mph in a staggering 2.6 seconds. Jeff, who resides in Victoria, Australia, worked for around 1,800 hours to develop his masterpiece that is now worth approximately $700,000.
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0:00
The Quantum's a culmination in my lifelong dream to build a supercar
0:06
This is the Quantum GP700
0:28
and that 700 stands for both the 700 horsepower it produces and the incredibly low 700 kilos it weighs
0:37
That's an incredible one-to-one power-to-weight ratio. It might look like a track car
0:50
and it does 0-60 mph in just 2.6 seconds. That's only a fraction slower than a Formula 1 car
1:01
While you might think it took a whole Formula 1 size team to put it together
1:06
it was in fact built by one man, Jeff David. And perhaps most incredibly of all, not only did Jeff build this car himself
1:15
he built it in his shed So my dream was to always build the Quantum So I thought I would start with the best car at the time the best roadster that I could buy
1:27
and that was an Aerial Adam. So I bought one and I dismantled it
1:33
and then started modifying it. So I progressively altered the engine and the chassis
1:39
and the drivetrain and the brakes to improve the performance, eventually culminating in a car that weighed 700 kilos and had 600 brake horsepower
1:49
Having modified the atom, Jeff used his knowledge to set about building the quantum from scratch
1:59
Starting at the nose, we've got the hand-fabricated front wing that I made
2:05
The design was based on a Formula 3 wing and I shaped it to try and give a really narrow front nose
2:14
Come around here and you can see all the moulds. I made all the original panels for the Quantum in carbon fibre
2:24
As we've all seen at Formula 1 cars when they have an accident and the track's strewn with carbon fibre all over, it shatters
2:31
So I experimented with various ballistics grade Kevlar weaves and aramid cloth and carbon fibre mixtures This is a result if Bez pants down to the ground and I tried this it unbelievably robust for carbon fibre Kevlar aramid cloth
2:54
The tyres are roadly or semi-sleek. The steering wheel is made, custom made
2:59
Geoff's talent for custom making even extended to creating a bespoke engine for the car
3:05
The engine's evolved over many different versions. The overall result has been its progressive increase in power
3:13
from the 300 brake horsepower where we started to 700 horsepower now
3:20
It's probably the highest powered supercharged engine in the world of that style
3:25
which is emission compliant and road legal. And Geoff even made sure the car was comfortable to drive
3:35
During the design process of the car, it was really important to me that the car was comfortable
3:44
to drive on the road. And I applied suspension that I've developed over 30 years into a shock absorber concept
3:53
on the Quantum. And that actually worked much better than I ever expected it might have and it provides a comfortable compliant ride on our very rough roads
4:13
The whole process was enormous, time consuming. I'd get up at 5.30 in the morning and curfew
4:20
was enforced by my wife at 7 o'clock at night and that was 7 days a week. My wife was really
4:27
and she offered to provide the financial support for the family. She gave me a two-year deadline
4:33
so I was able to work full-time for two years uninterrupted and to try and get the car finished
4:40
The component cost was about just over US$300,000 three years ago when the car was built
4:47
and it's approximately 1,800 hours to build the car. With a price tag that has definitely exceeded US$300,000
4:54
Jeff's masterpiece isn't for sale although he hasn't ruled out the possibility of building a new model
5:02
if he found an eager customer I just love the look of the car and the way it's turned out
5:08
the handling, the performance, the exhilaration every aspect of the car, I really enjoy it and I really love it
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