So i played Forza 5 for the first time a few weeks ago, had an absolute blast; making ridiculous 800kw beetles and 1000+nm muscle cars. I decided to play again today, purchased a Golf GTI through the event select menu, “sold” all these undrivable cars i had then went to tune the golf. . . So it’s already tuned, and i now have no money. But the tune is terrible and i can’t actually win any races in it.
So now i have a car i can’t win in and no money to buy/tune my way to victory. Why no sell cars for credits Turn 10? I guess i’ll just wait till the next forza game comes out and hope all the issues are fixed.
Race in free play or Rivals mode to earn some money.
If you don’t have any credits in this game it’s for only one or two reasons: 1) you’re lazy. 2) you don’t want credits.
It’s not that hard to just sit and do the championships, do the credit grinding thing (if you’re into mind numbing activities,) or just challenge yourself in rivals.
Tune your car. Is got parts that’s were paid for in the auto upgrade.
DON’T BY A CAR accept in the main menu->car->buy car. Otherwise you purchase and auto upgrade to the class you are racing (career or MP)
I have over 40 million. Credits are no problem. I would save you funky builds til after you actually have credits. But you certainly free to play as you wish preferably quiet about complaining about credits, next time 
You will make credits a lot faster running laps at rivals or longer races in free play. Less menu time more race time. 60k is the XP cut off, so use math to figure out the lap counts or have fun and run more.
Damn its a very easy career , I had no probs completing it
I think this is the first time I’ve ever heard of someone having this “problem” in any Forza game. Amazing.
You shot yourself in your feet by wasting your credits for non-essential tunes, and getting rid of of your cars. Fortunately, you can make credits in online/free-play mode, so you aren’t stuck as you would think.
Also it’s only a few days till we get new rewards, being tier four should net you a fair few credits.