What is the most efficient way to make money in Gran Turismo 5?

Some of the Seasonal Events added in the recent update (1.05) have very good prizes. So far I've only attempted the 493hp GT-R race but coming 3rd gave me 340,000.

This update has also increased the rewards for winning races, but this is only in effect until the end of January 2011.

See http://blog.eu.playstation.com/2010/12/20/gran-turismo-5-functionality-update/ for more details.

Update:

After the release of the spec 2.0 patch, there is now a "Consecutive Login Bonus" - a bonus to both prize money and experience points. This bonus increases for every consecutive day you log into the game, up to a maximum of 5 days of increases.

The bonus is as follows:

• 1 day: 110%
• 2 days: 130%
• 3 days: 150%
• 4 days: 170%
• 5 days: 200% (ie. double rewards!)

So, make money even more efficiently by logging in each day for 5 consecutive days, then tackle some races.

A-Spec, Extreme series, American Championship, Indianapolis Motor Speedway.

Use a Race Modded Corvette (total cost ~600,000) for ~100k every 4-5 minutes. This seems to be the grind to go to for repeatable cash.

If you are just after money and don't mind "playing unconventionally" (i.e. cheating) there is something you can do. I have only read about this and have not tried it.

The basic idea is:

• Get yourself one of the Forumla One cars (e.g. the X2010)
• Choose a race on one of the indy tracks (Like the Wind, or Dream Car Championship)
• Using a rubber-band on the controller hold the right analog stick to full throttle
• Using a rubber-band hold the left analog stick to almost straight ahead but just slightly to the right
• Start the race

You should shoot off to the lead and then the car should follow the circut all the way around. You can win the race without having to do anything.

You could basically do that in B-spec anyways. The thing that makes this trick really worthwhile is this:

• Once the race has started plug in a USB keyboard
• Put something on the enter key so it is held down

Now when the race is over it will 'enter' through the credit/xp screens and restart the race. So you can leave this set up indefinitley and it will rake in money to the tune of ~$1million per hour, plus XP.

I would say the best way to earn money quickly is the Special Events. Some of them like the Jeff Gordon NASCAR Racing school can be pretty quick to go through, and they will get you a lot of Credits and Experience for each one you complete. I just did the Intermediate one last night and got roughly $50k per event.

The downside is that once you have already achieved a gold medal on a special event you don't earn anything from that event anymore. So you can only use this trick once, but it's a good one anyway.

My friend who plays GT5 swears by going to B-Spec mode if he gets bored and just make his AI teammate do races for him. Easiest way of earning creds ever.

You could do all of the Top Gear specials, they're super easy to do. ;)