At last!! Pity I lost out on alll the races I already did!
Tried my 15 minutes Daytona Oval with the Nissan GT-R Forza Edition and no Mod cards, setting power to less than 637 and weight greater than 3700 (n the Setup options) with Unbeatable opponents and won 122,500 credits and around 20,000 XP. You start on the front row and should pass the NSX that gets ahead of you on the back straight.
Tried my 15 minutes Daytona Oval with the Nissan GT-R Forza Edition and no Mod cards, setting power to less than 637 and weight greater than 3700 (n the Setup options) with Unbeatable opponents and won 122,500 credits and around 20,000 XP. You start on the front row and should pass the NSX that gets ahead of you on the back straight.