I know, I edited it so it implied a brand, but with no real names or models.
Scenario Description:Gentlemen’s Agreement, 1993
A new sportscar era is upon Japan where thanks to GT300 (which your company wants to compete in) your stock car has to be limited to 276 hp. Since your company values honesty you have to build an as fast as possible sportscar with 276 hp or less to beat the competition.
Technical Limitations:
Engine can make no more than 276 hp
Safety must be above 30
Regular unleaded
Cost below (A)
Manhours below (B)
Loudness less than 50
Technical Specifications:
*a) Weight less than 1600 kg (15%)
b) Sportiness above 40 (30%)
c) Tameness above 40 (25%)
d) MTBF higher than 53000 km (10%)
e) Laptime around airfield track in less than 1:26:00 (20%) *
I slightly modified my scenario 
EDIT: i edited it again ._.
Scenario Description:An Excellent Automobile
The year is 1957, Your almost world’s number-one American automaker is having a bit of a hard time. While yes, your line up does covered the whole market. But there’s still a big price gap between different model line, the biggest is between the middle-class model, and the most expensive upper-class model. You need something that will fill the gap nicely, an upper-middle-class model. It is relatively simple, any desirable car needs to have 3 S, Speed, Style and Snobbery. But come on, it’s just for filling the gap. You even have the name for it now, your own dad’s name! What could possibly go wrong?
Technical Limitations:
*OHV
V8
RWD
MTBF higher than x
Engine min capacity: 5-litre max capacity: 7-litre
*
Technical Specifications:
*a) Prestige above a (25%)
b) Comfort above b (25%)
c) 0-60 below c seconds (20%)
d) Loudness under d (20%)
e) Power above e hp (10%) *
Two little scenarios that I had in mind
It’s 1958 and despite the ever increasing opulence of your competitor’s designs with more chrome and bigger fins than ever your boss has different ideas. “One of everything you need. Nothing more” he says. The time has come for you to put his ideas into action, he founded the company and he signs your pay check after all.
Technical Limitations
No DOCH
2 valves per cylinder
Single carburettor (1 or 2 barrels)
Long life road tyres all the same width
Basic interior, entertainment and safety
Technical Specifications
Cost less than xxxx (35%)
MTBF above xxxx (20%)
Economy above xxxx (20%)
Tameness above xxxx (20%)
Loudness less than 40 (5%)
It’s 1990 and it has finally become clear to your company that the trend of turbo charged AWD sedans winning world rallies isn’t going to be reversed. Despite your many efforts to combat their seemingly endless string of victories. As part of the requirements for the upcoming season your company is required to build 5000 units of this year’s model in a street form.
Technical Limitations
AWD
Max engine 2000cc
Turbocharged engine
4 Door sedan body
Weight less than 1300 kg
Premium Unleaded
Technical Specifications
Lap time less than xxxx (30%)
Power more than xxxx (30%)
Sportiness more than xxxx (15%)
Top speed more than xxxx (15%)
0-100 km/h less than xxxx (10%)
Scenario Description: 2017, Turboconomy
- The year is 2017, and the market for boosted economical cars is on the rise. North America seems to love the sound of whistling turbos! However, strict limitations mean that you’ll have to innovate with this new vehicle. Your boss insists that you build a vehicle of this specification, so make it snappy and you might just get a raise!*
Technical Limitations:
- Emissions under X *
- Turbocharged Engine *
- RWD *
- Premium or Advanced Safety Package *
- Max Costs under $Y *
Technical Specifications:
*a) Total production cost under A (20%)
b) Top speed over B (25%)
c) MTBF Above C (10%)
d) Economy better than D (15%)
e) Sportiness above E (30%) *
Edit 1.0: Changed some stuff around. I hope this appeals to the devs . I hope “Turboconomy” gets put into the game! NOTE: Get it? Turboconomy? Ecoboost? Get it? You’re lame. xD
Edit 2.0: Fixed the safety package limitation.
Edit 3.0: Changed some more stuff around.
Scenario Description: 2008, Rice and curry
East Asian market has changed a lot in past few years. People would like to exchange their bicycles and rickshaws into more classy rides. Your worst competitor has already created the bread and butter for people. Pata Micro rules the market. You’ll have to match the competition.
Technical Limitations:
- Year 2008
4-5 seats
Displacement limit: 1000
Technical Specifications:
a) cost less than X (50%)
b) manufacturing time less than y (25%)
c) weight below z (15%)
d) acceleration 0-60 kph less than q (10%)
ps. you could easily create many variants out of this idea on different decades. But first you’ll have to simulate mules and donkeys into the game. 