Forza Motorsport 5

There is really no quick way around this one. No matter what you do, it's going to be approx. a 65-75 hours grind (this is total car use time, so it includes all time using that manufacturer in the championships + time spent grinding so more realistically 35-40 hours of your time solely for this achievement). But, there are some ways to make it less painful.

This is the method I've been doing the past few days and it has made it seem like a breeze:

Mode: Free Play.
Car: Select the car in which you would like to boost Affinity with.
Track: Indianapolis Motor Speedway - Oval
Max Drivatars: 15
Laps: Anywhere from 20-50 but at least 20. I will give more info on laps later in the solution.
Collision Mode: Always Off. This is just so you don't have to worry about hitting the other cars, it serves no other purpose than that.

Now all you have to do is race.

The reason for the 20 laps is because that will guarantee one affinity level every race, and will only take about 15-20 minutes. 40 laps will guarantee 2 levels but will take about 30-40 min. 50 laps will guarantee 2.5 levels but will take about 45-60 min. The time it takes really depends on the car you are driving. Each lap is equivalent to 1,000 EXP, and you need 20,000 EXP per affinity level, hence the 20 lap minimum. Of course you could do less, depending on how much you would like to space out race time. The intervals I would recommend though are 20, 40, or 50 laps. (50 is the max amount of laps allowed)

Level 25 info: (this has been consistent over all 4 manufacturers I have done)
Total XP: 485,000
Total Time Driven: 8-9 hours per car.


Happy grinding!!

***EDIT***
Thank you to peacemak3r for this one:

Alternatively, you can do the career races that yield large XP rewards, such as the ones that give 7,000-10,000 XP. Unfortunately it may be tough to find the high XP races for the specific manufacturer you are boosting.

***EDIT 2***
Credit goes to RzrsS for this one:

If you would like to do this with little to no effort:
Set up a private multiplayer lobby. Do a 1 mile drag with ten heats and a 5 second end race timer. Rubber band your RT. You will receive 10000 XP every 10/12 minutes. It will take a slight amount of time more, but will require no effort!
Note: You will have to press (x) still after every race, so you will have to monitor the game. I'd just advice doing something else in the process such as watching Netflix on a laptop or play a PC game on a laptop if that is an available option to you.

***EDIT 3***
Credit goes to O6 FresH:
(This is just a copy and paste quote from the comments):
"better/faster way to rank up X Class , and P class cars
just thought i would tell you guys about this ive been doing it all day/night and its working faster than indy 50 laps i realized it while trying to get in the top100 on the leaderboards for x class cars on certain tracks , if you enter rival mode and play tracks like Prague Full circuit and bathurst australia if you do about 10 laps which with X and P class cars is just over minute if your a decent driver you will get like 22 thousand xp every 13mins which is alot better than indy oval and alot more fun especially if your trying to get a fast lap try it out for your self and see , you also get quite abit more money for the rival bonus anyway give it a try its defo faster and less boring than indy only thing is its only good for X and P class cars peace
sorry about the grammer lol"

This can be boosted overnight or while at work with any car manufacturer, without needing to press any buttons other than rubber banding down RT to accelerate. This will also help you level up and can contribute to your multiplayer medals. This is slower than doing the methods that ReptarOnIce3000 has in his solution, but all those require at least regular checks on the controller to advance, while this method does not require that - It's completely hands off.

What you need to do is enter multiplayer, then go to "Special Events." Go to "Unlimited Drag", which should be the first option on the list. Search for a match, choose a car made by the manufacturer who's affinity that you want to increase, rubber band RT down, and that's it! You don't ever need to press A to advance - You will never leave the lobby and drag races will automatically select a map and start without any input by you, so long as there are at least 2 people in the lobby. You can completely ignore the "You will leave the race in 30 seconds" screen at the end of a race. Make sure your controller is plugged in to make sure it doesn't automatically shut off (I'm unsure if holding down RT will prevent the controller turning off from inactivity when not plugged in).

While this is enough to get races completed and will contribute minimally to XP and affinity, actually earning medals will earn you much more. [Edit: Per the comments, gaining medals only contributes to Driver Level experience, not affinity, so if you don't need that you can ignore this section] This is harder to do while idle, but still possible. You're going to want to choose the fastest car you can get with the manufacturer you need, and search for a drag race tune and apply it to your car. This will help immensely towards getting medals in the drag events, increasing your affinity that much more. Lots of people are pro at this, and you will still get beat quite a bit, but once in a blue moon you will earn a medal which increases the earnings substantially. You will also want as many assists off as possible to increase your XP gain, while keeping automatic transmission and traction help on obviously since you won't be at your controller to manually shift.

I tried this last night and went from affinity 9 to affinity 17 with a manufacturer, and earned about 10 levels in the process. i also earned quite a few multiplayer medals.

Even better, find a partner to agree to use each others' tunes and paint jobs while each doing this, and you are certain to get all those achievements after an overnight session.

This method isn't fool proof - In the morning after my first try with this, my Xbox was frozen on a black screen and required a restart. While boosting it at work, I returned home to a "You have been disconnected from the game" screen. Both times, however, I attained substantial progress before hitting some sort of issue. If you are dedicated about leaving this on overnight or while otherwise away from your xbox, I can't see this taking more than a week or two to complete this achievement, while also getting all 325 multiplayer medals and getting all the driver level achievements - All without actually needing to play.

TIP FROM I Turbro I: "When I tried this method the first 2 times I noticed after about 2-3 hours my Xbox would quit the game & go back to Home, I found out it was due to my Kinect being plugged in. When the Kinect can't see you in the room for a couple of hours it backs you out like that. To fix the problem is whenever your going to perform the method above just go to Settings - Kinect - & Uncheck the Kinect on box (so Kinect is off). Then continue & enjoy your boosting. "

The most efficient and fun way I can think of completing this achievement is by playing multiplayer and working towards the 'Full Medal Jacket' achievement, which is to earn 325 medals in multiplayer. As well as that, chances are that you will take part in 50 races on Long Beach and 50 races on Nurburgring, netting you both 'Beach Hopper' and 'Ringer'.

The best thing to do is to choose a class you want to race in and then choose a very consistent lobby car (or one you see regularly at the top of the leaderboards in Rivals for that specific class). Don't forget to choose a good tune before you take it online too! I find many of the cars are very good with a 'Tuned by Worm' tune.

While working your way to 325 medals, race one of these classes with your car of choice, and you'll eventually reach level 25 affinity with the car's manufacturer. Once you've completed one, switch class and choose a different car manufacturer.

For example, here's what I've been doing so far:

X Class: Lotus E21
P Class: #55 Mazda 787B (VIP Exclusive, thanks HolyHa1fDead for pointing it out!)
R Class: BMW M3 Race Car/#92 M3 GT2
S Class: Formula Ford

I'm still working my way to 8 manufacturers, but it's certainly more enjoyable to do it in multiplayer rather than driving round in circles or taping up your controller for drag races. Not only that, but it helps you earn other achievements online!

Hope this helps anyone, and if you have any other suggestions for cars to use or any questions, feel free to ask them in the comments

There are many good solutions for this chivo. I tried to make a plan for it before i started playing the game, but even if you are doing in a way to cumulative other achievements in the meantime, you still have to spend a lot of time with it after you are done with every other achievement.

Before we start talking about the cars themself, let me explain how you boost your affinity level. Basicly, it is calculated by the distance you had driven in previous races. A good way to farm it to either set up a Multiplayer Private Lobby, or a Free Race on the Indianapolis Oval track. Set the laps to 20, which will grant you at least One Affinity Level for sure. If you are about to add AI drivers as well, turn off the collision so you don't have to bother with unnecessary overtakings. While you might think it can be AFK boosted by rubberbandig your controller, i must warn you to not do that! If the game doesn't perceive any kind of controller movement or button pressing, it won't give you any Affinity XP and you are going to waste your precious time!!! So in this case, you must sit in front of your console and play, as usually.

For an AFK boosting you can set up a Multiplayer Private lobby for a 1 Mile Drag Race. Set up the Heats to 10, and the End Race Timer to 00:05. It gives you less Affinity XP, but at least you don't have to do anything. Just rubberband your Right Trigger and let it go. After the 10 races are done, you will be dropped back to the Private Multiplayer Lobby, where you have to press X to start the race again with the same settings. It occurs around every 15-20 minutes, depending how fast your car is.

With that being said, let's see my recommendations:



1st: Ferrari

It's pretty self explenatory. There are lots of Ferraris in the game, almost in every category you will find one of them. While completing the Campsionships, i was always looking for a Ferrari. At half way of the Carreer you will eventually reach level 25. Also, owning and driving 10 Ferraries will grant you the following achievement:



2nd: Mclaren

Why McLaren? Well first, there are two achievements in the Nürburgring DLC which "forces" you to drive a McLaren. Here they are:



and



I also recommend to complete the 25 Nurburgring Rivals events, the 50 Multiplayer events on Nurburgring and the 25 gold medals on Nurburgring in Free Play with a McLaren. At the end of those, you'll easily be level 22 so you don't have to grind that much. Or also, complete one or two championships in carreer with a car from this manufacturer.

3rd: Audi

Again, in the Nürburgring DLC there is an achievement for driving 200 miles on the Nurburgring in an Audi, BMW, Mercedes-Benz, or Volkswagen models.



Go and buy the 2012 Audi #1 Audi Sport Team Joest R18 e-tron quattro. It's very fast and easy to handle. I also completed a few Championships with it (sorry, i don't remember which category is allowing you to use this car) And of course you can combine it with the previously mentioned Nürburgring Rivals/Multiplayer/Free Play achievements. It's your call.

4th: Honda

Buy either the Honda Dallara DW12 Target Chip Ganassi #9 or the Honda Dallara DW12 Rahal Letterman Lanigan Racing #15 in order to complete the following chivo:



I also did the following ones with the Honda:







So basicly, just use the Honda for every Long Beach chivo which doesn't restrict you for a specific car or manufacturer. You can also complete a few Championships with it as well.

5th: Lotus

I have no particular reason for this pick except the fact that the fastest car in the game is a Lotus F1 car. When i was boosting the multiplayer with my friend, paintjob and tune achievements as well , we agreed to use the Lotus E21, because this is the fastest car in the game. I still had to run a few circles on the Indianapolis Oval track after we finished the multiplayer part of the game, but since it has a lot of good X category tunings, it is super fast to complete 20 laps on the oval track, which most likely provides you one affinity level.

6th: Anything you want. My suggestion is either Ford or Renault

This could be anything else to be honest. i did it with Ford, because i used a couple of Ford cars during my Carreer, but to be honest, Renault might would be a wiser choice. The Clio is a super car, and you can also find a relatively fast Spark SRT_01E in the Formula E divison.

7th: Holden

Why the Holden, you might ask? Well anyway, you are forced to do the following achievement with a Holden:



and by the time i did this, i was already on level 12, so i thought, why not pick this one as one of the 8 manufacturers? In this point you will run out of chivos anyway, so i just loaded up the Indianapolis Oval track to do some circles on it and used the Drag boosting method when i was sick of the game.

8th: Lamborghini

This was a choice of my hearth, because i exceedingly like Lamborghini cars. I used a few of them while playing Carreer, so by the time as i completed the 7 manufacturers, this had the highest level. So i bought the Lamborghini Veneno, tuned it all the way up to P category, and ran the mandatory circles on Indianapolis and did a few Drag races when i was afk.