this one is a little trick to get you game started off fast. this is good for anyone starting a new file who wants to race through the game quickly.
first, Choose a Toyota Sprinter Trueno GT Apex or the 128 hp Mazda MX-5 Miata as your first car. then do the oil change trick to boost ur hp. Go win the Sunday Cup, then the Clubman Cup (with any necessary upgrades), and sell whichever prize car is the duplicate. Now you should have enough money to buy T2 (super-slick) tires for your Miata (if not, go get some more). Equip the tires and get an oil change for your Miata to boost it's hp. Now go enter the Roadster Endurance race at Apricot Hill. This will require an IA license (you're going to get it eventually, why not now?). The race will take about 70 minutes and since this is a normal tuned miata race, the competition shouldn't be too difficult to win over. With the T2 tires, you should only have to pit one or two times during the race, while the rest of the field pits at least 5 times in the race. Your superior pit strategy will give you a great advantage over your opponents. It is also required that you can drive decently, and not make too many big mistakes. Being a relatively easy course driven with a slow car, you shouldn't have any trouble at all if you honestly got your IA license. Cutting the chicane (s-turn) also helps. The prize money for winning is 100,000 cr, and, if you're lucky, you will also get an F688/S, one of the top 6 best cars in the game. If the F688/S fails to show its face, you can use the 100 grand to buy a decent car, and win the Seattle 100 or Super Speedway. The prize for these races is 200 grand and 150 grand respectively, and a pretty fast car (400+ hp) is guaranteed, not to mention the possibility of getting another F1. Things will go uphill from there.