Many may lament at the inclusion of NASCAR in GT5, HOWEVER, it is one of the easier money tricks I've found out so far when you are at mid level 21 A spec.
Firstly, do ALL of the Jeff Gordons challenges.
Remember three (3) key points:
*Always deactivate ABS when you are doing an oval circuit with no braking - Daytona and Indy
**Always deactivate ABS and ASM when doing any other circuit. ASM causes you to understeer at all corners, fast and slow.
***Almost NEVER use first gear unless you are in a straight coming out of a sharp bend - say in Laguna Seca at the final bend. First gear has a crap load of torque and without any aids, will spin you right round in circles and into a wall.
Once you are level 21, you should have won a NASCAR from finishing all of Jeff Gordons advance challenges. Extreme events should be unlocked. With your new car, immediately slap on soft slick racing tires - 36,000 is a drop in a bucket in comparison to the advantages you have on field and how much you can win. Immediately do an oil change as well. I guess I don't know the meaning of STOCK in NASCAR
In Extreme events, you should see the NASCAR special. I recommend you start with the regular series first before tackling the Championship so you know how your car behaves in circuits other than ovals. It actually drives
very well with ASM off and braking distance is respectable for an all out racing sports car. Its nice now as you can get rammed from cars and never get disqualified. This is now bumper car racing (sigh....) Do all of them and you've netted yourself $45,600 per event X 5 tracks = $228,000.
Now do the championship the exact way you did the individual races and that should net you another $228,000. Try to get first in all races - it's pretty easy. After the championship you are awarded ANOTHER $228,000 for finishing with 500 championship points - 100 points X 5 races.
So that's $228,000 X 3 = $684,000. Plus your prize car is a 1964 something. I think it will be useful for the legendary races, not quite sure. Haven't had it delivered yet.
All in all this took me about 70 or so minutes to do everything.