I know there have been threads about this before however this one will be different because I am making it. Firstly it is important to know what the games will include and other factors:

Forza 3

Platform: 360 with userbase of 30.52 million

Release Date: October 27th 2009

Info:  400 cars, 50 manufacturers, over 100 tracks, damage, vehicle rollover, online play, customization.

RPG's guess: 5.3 million LTD

NFS: Shift

Platforms: PS3, 360, PSP, PC, iPhone and Mobile.

Release Date: September 17-22 2009

Info: About 80 cars.......err no idea about anything else TBH.

RPG's guess: Combined 5 million.

PSP Mobile

Platform: PSP with userbase 47.84 million

Release Date: October 1st 2009 EU & NA, 8th October 2009 Japan.

Info: 800 cars, 35 tracks, no damage, ad-hoc multi-player, has GT in the title.

RPG's guess: 3.0 million LTD including both DD and UMD

GT5

Platform: PS3 with userbase 22.55 million

Release Date: ????????????????

Info: WRC, Nascar, Damage I assume for only certain cars, online play and more than 10 cars.

RPG's guess: 8.2 million

Looking at those userbases and simply how games on each platform sell I think Forza 3 will sell pretty close to GT5 numbers. Forza numbers keep increasing while GT decreases. This is coming from a GT fan but come on.......GT5 is not going to do 10 million and GT Mobile numbers will be great for a PSP game. PS3 owners purchase less games than 360 owners it's as simple as that. Just post the numbers you predict and go away please, best not to make this thread into a shitstorm. NFS: Shift is releasing on everything under the sun and the brand name is simply very strong.

You're way to high on NFS and Forza 3 in my opinion.

Forza 3: 2.5M

NFS: 3.5M

GT PSP: 4M

GT5: 8M

For GT5 in info you said "more than 10 cars". You might wanna correct that.

NFS last year was shit and look how many it has already sold. This one look good and expect the quality to push the sales of the game up. Forza 3 looks great and has great features, I also expect MS marketing to do the full monty which will push up Forza 3 sales a lot. GT is not that big in NA anymore and Forza 3 could easily outsell it by a large amount in NA.

EU and Japan are all GT5 though however Forza still does pretty darn well in EU.

Sabby we have no idea about the car roster, I am going on the safe side. ;)

2.5mil for Forza 3?! That game is garunteed 4mil+.

Forza 3 - 5M
NFS Shift - 2M max
GT Mobile - 3.5M
GT5 - 8.7M

only if its bundles. Forza 2 gained about 2M sales from bundles.

funny, gt5 prologue should 2.2 mil, and gt5 is gonna sell 8 mill, lol, anyone who has a ps3 who loves gt series we can say went out and bought a copy of gt5 prologue, we can estimate that if those same people went out again an easy 2.2 mill is very possible, we can estimate again that maybe another 2.2 million who held back on the game because it was a half game will go out and try gt5, total would be around 4-5 million but 8 million lol, we'll see. anyway at 5-6 million for forza 3 i think is about right, maybe even a little more due to the fact that now there's 30.4 million user base.

Previous GT prologues have sold less than GT5P.

Previous GT games have sold more than 8M

And didn't GT5P pass the 3M mark?