i never know what to do. i tried using guides does not help me. tried using calculators why use them when i dont understand anything. i dont know what upgrades to put on for power yada.
can’t buy tunes cuz i dont have gold and the tunes i have i can’t see what they did cuz there locked and no one messages me back so i can get a unlocked version :9
Run it stock ? 
no
no
you could always start by trying the in-game auto-upgrade and drive the car while thinking about what you think it lacks - grip? acceleration? top speed? and then swap some relevant parts… larger-or-sportier tires, weight reduction, power upgrades, etc. -and/or- tweek some settings - adjust the final drive (if you have sport or race transmission, for example), but you are going to have to drive and try a few things in order to learn what the various things do!
^ this is a good suggestion. what car are you currently trying to tune? I’m not great at tuning I know I’ve had more failures then success’es and it gets discouraging sometimes. You just keep trying,experimenting and practicing, it takes a long time to get really good.
Look on the tuning forum for open source tunes.
well what is the car(s) you want to tune (I’m really good at Mazda, I had problems having my S class Mazda keeping up with the crowd and then I tuned it and I can beat the heck out of anyone S class with it. and I do American muscle too)
mazada roadster for a class. i got the one from the marketplace its great but to twitchy and car becomes unstable to much for way i drive.
also i hate driving and trying to predicte what it needs honestly i just buy tunes but as i have no gold now im stuck. i got a few algorthims for springs damper what have you but really i have on idea still on what im auctually doing. also the tuining threads suck no open source tunes anywhere i look even on the archived websie.
You’ve asked for advice, seemingly wanting to learn something - and that’s exactly what the good folks here seem to have been giving you.
Do you want the answer served up to you or do you want to learn something? (not that there is only one answer, there are way too many variables!)
If you have a specific car in mind _ for a specific class (S, A, B, C… etc.) for a paticular type of track (long straights? short & twisty… ) - you haven’t exactly come out and said: I need an open source tune poster here for car in class for races at…
I might say good luck with that or I might help, depends ;^)
And also, I dont’ believe you’ve search the internets very diligently either. There is a lot of stuff out there! To which I feel I should add - MS/T10 could/should have done a much better job providing guidance and they probably should never have nuked all of the old(er) comunity generated stuff from their site - yes, all of the open source stuff that was here is now gone, never to be re-posted, here anyway. why would anyone?
There were a lot of great tunes on the old forum tuning section, unfortunately they are all go now. I tried the legacy link and they must have took them down. I have a B-Class 2001 MX-5 Roadster tune I was working on a long time ago, I’ll take another look at it and see if I can make it work in A-class. If I have any luck I’ll post both A and B builds in the tuning section open source.
You’re making it hard for people to help you here!
Have a look at this http://forums.forza.net/turn10_postst5170_-HMR--Fire-Sale--X-S-class---All-the-money-must-go.aspx
It may not have all the cars you want but no one glove fits all. Still, try some of them out and you can see how everything works. You could even try putting one setting on at a time to see how they work.
Edit: Tuning’s not easy. It’s taken 3 years for me to be where I am now. If you expect to be a guru in a week then that’s not going to happen 
What I did was take the advice and tips and start building things. Tuning out respective cars’ traits, etc.
Nice Motorhead! I stand corrected (about thinking nobody was going to be reposting their tunes!) - I think the title of that post must have disguised it, I don’t recall having see it before now - I probably dismissed it without reading it, thinking it was a advertisment for an End of FM4 Auction!
Cheers 
I did rename the thread to me more apt to its purpose now!
It it frustrating, we all understand! There is no “answer” for a car’s tune. there is an ideal set of settings according to physics, but that’s worthless since we as humans are not capable to repeatedly reproduce the exact same set of behaviors (or in this case, steering, braking and gas pedal inputs).
This next point is important, read it twice, three times even… the single most effecting component to how well your car will perform on any given track is… your own driving. If you aren’t able to brake or turn correctly into a turn to maximize your exit speed, the suspension or transmission settings, or how much power the car makes are nearly irrelevant.
One thing that I have realized that I’ve like better about Gran Turismo as compared to Forza Motorsport, is that GT required you to pass particular tests to obtain licenses that allowed you to race at a particular level. These tests in effect taught you about the racing line, and not in a generic sense. It actually has you drive through a particular corner in a FWD, RWD, and mid engine configurations. Each one requires a different racing line to maximize the particular benefits or detriments of that particular configuration. While T10 has provided the suggested line and it worth it to study and try to follow it, but T10 doesn’t provide any explanation as to why that line is to suggested one. Understanding why you want to brake early, cut close to the peak/center of the turn and power out wide will provide the ground work for why you will want your sway bars, springs, and dampers set in a particular way.
I realize it may seen like we’re coming down on you hard, but we are really just trying to help you find the perspective to endure a bit more of the frustration so that you can enjoy a level of racing that you seem to be aiming at. This may seem obvious, but if you’re not having fun you’re not playing right. If the tuning gets to monotonous, take a step back and do something different and then come back to it. Some of my best times have come not after a marathon of 40-50 laps trying to bang out that last tenth of a second, but the second lap the next morning.
Lastly there are a couple general concepts that stay true in whatever type of racing you do. One of the cheif concepts is this, “a loose car is a fast car”. Driving a car that handles “like it’s on rails” is a great feeling! That grip comes at a price though, you pay in a currency of speed to obtain more grip. Finding that limit of TOO loose and riding right on it is the key to achieving your fastest times. How you do that becomes a philosophical debate. Some will work better moving in from too loose towards that limit; Others will have a better experience coming in from too tight. You have to find what works for you. For me personally, I started by building everything with the highest lateral g’s that I could possibly get and then trying to lock the car to the track. That worked fine as long as I found the perfect line around a track. As soon as I got on the track with others, I wasn’t able to be on that line. Sure I was able to carve my way around the corners and stay on the track, I was able to hang right with the guy who was trying to pass me on the inside of a turn. After the turn he carried more speed out of the corner and rocketed away down the next straight leaving me hoping that I could catch him on the next turn.
Hang in there, don’t be ashamed to use some of the assists. ABS, TCS, and automatic assists will let you take your mind off of some of all that’s going on. Yeah, eventually you’ll want to turn them off, and you’ll start getting faster times when you do, but knowing the racing line is paramount to whether you let the computer help you stop and shift.
This all is under the assumption that you haven’t master the racing line, if you have and your tune is truly the problem, there are folks here who can try to help out. You can look up times on the leaderboard through the internet to give you a reference of how fast you’re actually going. Whether the car is handling like you want is actually more important than whether your lap times are top 100 or not. If you’ll post the car your using, the upgrades and settings your using and what the car is doing that you don’t like, we can try to help you out.
Lastly, do some searching for Xbox rewards, there are a few ways that you can earn “credit” through Microsoft that may allow you to get a month or so of Gold Xbox Live. To get a bit personal, I’m not able to work right now due to medical stuff going on and my wife doesn’t work… so I won’t pretend that spending even $10 bucks on a game is a trivial thing sometimes. A single month of Gold Xbox Live is $9, it might be worth it to you to pick up a month every now and then so that you can have access to the storefront and are able to share replays with folks. On the other hand if you don’t have a harddrive in your xbox to be able to save or watch replays, racing online with someone who can will allow them to watch the replays to be able to advise you on what they may reveal.
Hopefully this helps… It’s all good … to borrow from a meme … Keep Calm and Drive on! lol
I just copied and saved that to word because it seemed like a lot of good advice. I never heard that about the loose car being fast. Hmmmmm… I’m like you though, I want it to grip real good because it seems like it gives me more control when I don’t know a track well. I know for me that’s a big part of my problem. Not remembering how fast to take every turn, with that car. And mastering the lines like you said. Knowing when to brake. I usually brake way too late. I think I need to start learning how to brake early. But then I’m not as fast. LOL.
I’ve built some cars playing the world tour that are tuneable, but yet to really do too much tuning. I might change the camber a .1 or 2 and caster maybe. I deflate the tires a half a pound. But I’m with him, I have no clue what’s going to work. I have yet to even touch the sway bar setting or shock settings. I did adjust a 1st gear once on my Ford GT40MKII. Because the stock first gear is so tall. But then come to think of it by the time you put the race gearbox in there, it’s not as tall and I didn’t really need to adjust it. hehehehe
Haha, thanks… I’m only sharing what I’ve learned. Hopefully, it’ll help someone enjoy things a bit!
If tuning troubles you that much why bother? at least for now? there are many good tunes on the storefronts, just take a bit of searching and testing. Eventually you’ll find some names that their tunes suit you well and there you have a good start. Like Motorhead said it took a looong time to reach a good level in tuning, and open source tunes wont get you there faster in my opinion. Drive more and improve is the first thing to do.
have to give this go when i’m not working just started a new job so i might not be on fm4 much longer before going fm5 which i know you need to learn to tune or you suffer as alot people dont tune or play fm5