Kinda late arrival to the Forza 4 party but better late than never.
I’m playing around with tuning and not being a gearhead I read up on it and found a few tuning apps that really improved my understanding and my lap time too. I ran across Forza Tuning Labs calculator and most of it was easy but I am stumped on where to find a few values.
What I am looking for is
Lateral G’s
Tire Aspect Ratios
Limited Speed
Final Drive Override
Launch Override
Power Handicap
Also when I enter any value such as S or R1 or R2 into Class it changes to false so not sure what to put in there either. I started with an Audi R8 5.2 FSI and upgraded from there to race parts.
I watched a Youtube video about it and was able to get most everything else from there but these values are eluding me. Sure would be nice if they included a single window with a complete dataset of values for a particular car in the next version instead of hiding them all over the game.
It’s been a while since I used the calc, but;
Lateral G’s and top speed are found on the benchmark screen.
Aspect ratio is the middle number in the tire size - 315/40R/16
Final drive override use your current F/D ratio, changing this will give you new gear ratios in the trans section
I think launch override is your first gear ratio, you may be able to leave this blank
Power handicap, leave this blank
In the class box, just enter the current PI, it will automatically fill in the class
Thanks man!! Its now spitting out numbers that I can use and already beat a previous ghost on Nurburgring. Now to figure out how to fine tune from there
Glad I could help bud! Keep good notes on the changes you make to your tunes. Once you learn how you like your set ups, you can then use the modifiers to customize the calc giving you settings even closer to what you want. For example, like to run your dampers softer than the calc suggest? Set the percentage lower to get a softer set up.
And eventually you end up using one calculator for spring rates and dampers, another for caster angle, and a third for ARBs with modifier values for each then do your own ride height, LSD, and camber (those are far more individual for each car anyways) haha!
Once you get the general feel for suspension come see me for a little Gear Ratio 101 and I’ll show you how you can shave entire seconds off your lap times without ever touching the suspension! Racecars in particular are sensitive to gearing changes so as you step into R3 and above true racing machines the gearing can often be the thing that separates a middle-of-the-pack car from the guy in 1st place. It’s important with production cars (especially in the lower classes as you have far less power to sacrifice to a mediocre gearing setup), but above S700 is where it really starts to get crazy and you’ll essentially have to forget most of the stuff you learned in the lower classes.
I think I have every version of this calculator that Slave Munky has released.
Best Calculator ever created to get a quick tune.
“Lateral G’s” can easily be found when you go to the Tire Upgrades while adding upgrades to your car in Forza 4.
If you already have Race Tires installed, just click on a different upgrade, shuch at Stock, and you will see the Lateral G’s for the new upgrade.
Most of the information needed to enter into the Calculator can be found when you go to “MY Car” and press the “X” button. You will then jog to the right to display your cars HP, Torq, Weight and so on except for Lateral G’s which will be shown when you want to purchase a different type of tire upgrade.
You can also see the Lateral G’s when you want to load a different saved tune.
" Final Drive Override" Change the final Drive when you want shorter gears that will enable you to use all the gears on shorter tracks.
Just move your mouse over the box that says Final Drive Override and it will explain what it does.
Go to the FTC website and ask questions for what you want to know.
Thanks for the reply. One of my issues was the version of Excel I am using was stripping away the comments from those settings as well as on the advanced side so I didn’t know what those were trying to tell me. Now I have that resolved and I am familiar where to find the values in FM4 I can get a tune out of it.
Only real mystery still is the Aero. In one video I saw the guy mentioned finding the minimum and maximum settings and inputting those and letting the Calc make suggestions. I still havent found where any value inputs for where the Aero goes.
Sorry for the delay bud, it’s been so long I had to actually load a sheet to confirm, haha.
In earlier versions you had to input the min and max values for the aero. You probably watched an older video. The latest version, 4.9, already has all the values in the database for each car. They are already there when the sheet calculates the tune, with the suggested values at the bottom. You can modify those values to your preferred type of set up by changing the percentages.
I was leaving them at stock value but over the weekend noticed that the value for Aero was changing when I changed cars so I started inputting the suggested values and getting good results. Not Leaderboard results but I’m improving.
Still figuring out what works best for me as far as upgrades go when moving cars up through classes. I was stripping weight first and then adding suspension and then HP till I figured out I was making fast cars that wouldn’t stay on the track because I could only get stock or maybe sport tires.
I reconfigured and went suspension, race tires then weight and finally adding HP if anything was left to keep in the target class. I’m doing better about keeping on the track… which is pretty important.
I’ve been having trouble with the 4.9 calculator on some vehicles it gives me outrageous numbers for roll bar stiffness like example front 120 and rear 90? and some for rebound stiffness like 16.5 and 12.3? when clearly I cant go that high lol… I had an older version that worked great but this new one I am having trouble with so please if anyone could help that would be great.
I’ve noticed that on heavier cars. There was a post on their forum about it and the author said the numbers were solid but didn’t offer any advice on what to do about it.
What I’ve been doing in the case is over on the far right are some advanced settings that I dial back to 70% or even lower to get the numbers down to something Forza 4 will accept. My reasoning is that setting both front and back down equally then you still maintain the balance it was trying to achieve even at a slightly lesser setting. So far its been working for me or I’ve been working around it. I figured the balanced setting was better than just setting them both to max and hoping for the best.
The majority of cars I have processed through the sheet have shown drastic improvements but all but a few required some slight tweeks after the fact.
There’s a couple of things that can cause that, but for the life of me I can’t remember them, LOL! Are you using Excel or Open Office? OO can sometimes have problems as it doesn’t always calculate the info correctly. That spreadsheet is not supported by FTL, though I use it and usually it works fine. Do you have the correct download for the version of Excel you are using, if that is your spreadsheet? That can also cause issues. You used to have to enable the analytical tools before as well, not sure if you still do. When I get a chance I will check the Tuning Lab forum and get back to you.
