I am in no way a fast driver nor am I a tuning expert, but I've always preferred to do my own tunings instead of using tunes made by someone else, which gives me a better feel on how the car works. Having a degree in automotive engineering I have an idea how the game is supposed to act in simulating the driving, which goes a long way.
I hate the way the cars are set stock in the game, with "understeery" suspension and way too powerful LSD, causing me issues as I drive with a wheel (Logitech G29). I always do my tunes at Suzuka East Circuit, after getting them "done" I verify that everything is done right on the full circuit. I have landed on Suzuka because it's pretty "neutral" track, with certain key points to highlight possible issues in the tune. My tunes on my cars are "generally good" setups which work (for me) on any given track without modifying them. For events on certain tracks I often modify these base tunes to the track, but the original setting will always be the primary one.
These are the basics I go through until I feel the car is set up so it feels like it fits my hands. I often do some minor touch ups on my cars when I use them more, if I feel like the initial setup is not "quite there".
My basic rule of thumb setting things up go in this order: - Transmission Flip - Anti-roll bar settings - Ride height and spring stiffness (or "frequency" in GT Sport) - Toe-in / -out - LSD setup
I don't really touch the dampers, as I have no way to test how they act in game and testing them "by hand" doesn't really seem to make any sense, given how far just setting the springs get me.
I always change things around by setting them up one to two clicks at a time, testing for few laps in between. I try to avoid changing several things at once, as it may cause unwanted results which are hard to troubleshoot after.
Transmission flip "Set once and you're done". Basically this means you set up a close ratio gearbox (first and last gear being as close as they can be), with even spacing between gears. After setting this up you just set the final gear to the top speed you wish to reach and you're always set to race on any given track.
Anti-roll bar settings Almost every car I have I set this to 8 front, 9 back. This limits the body roll quite a lot, while introducing little oversteer due to the stiffer rear setting.
Ride height and spring stiffness Roughly I could describe my method as "low and stiff", as I often set the ride height as low as I can go without the car clipping on curbs or other track surface objects. The spring stiffness I set to be as stiff as the suspension needs to be to prevent bottoming out at the height I use. I prefer to rise the rear end of the car a bit higher than the front, which increases the rotation of the car around its central axis. This is more or less a feel thing, but roughly all my cars are about 10mm higher at the back.
Toe-in / -out Toe-in for understeer, toe-out for oversteer. Bigger effect comes from the rear end settings. Depending on the car I always start by setting the rear toe-in down to 0.40 (if it's higher) to take away the understeer the cars have, setting it lower if the car needs it. Front end will have toe-out at 0.10 which I will set higher if the corner entry doesn't feel like it has enough "bite" to it. The group cars (Gr. 3, 4, B, X) already have some toe-out at front which I don't often touch (around 0.25).
LSD setup I personally prefer to have a relatively "mild" LSD-settings. I usually set the initial torque to 10, as it seems like a good compromise. Then I set the acceleration setting down to the point where the car does not easily lock up the wheels on throttle opening at leaving the corner, which tends to cause me the most problems (as I drive with a wheel). Deceleration setting is down to the point where going to engine braking does not introduce understeer.
I have my basic starting point to where I often roughly set the car, then it's all about just driving around and taking notes on how the car feels like. I've found that about three laps between setting things up work for me to get the general idea, and after I move to the full circuit I can really nail down what I still need to adjust.
Last Edit: Mar 9, 2018 12:37:43 GMT by Askorbiini: Added the transmission flip instructions
Everything here is based on the smart minds at GT Planet, but I couldn't find the original post which covered this so credit could not be given. (I will when I find it)
This is the best possible compromise in setting the gearbox, as it gives you equally spaced gearing in which every gear is set in relation to the adjacent gears. It requires a bit of calculator usage, but after it has been set you only need to adjust the final gear to set your top speed and you're good to go.
For each of the gears you need to look up the highest and lowest ratio numbers, which is used as the base. I have included the formula and the calculation steps below, so just insert the values and let the calculator do its work.
First step on all gearboxes 1) Set the final gear slider to maximum (far right) 2) Set the max speed slider to minimum (far left)
Second step, 5 speed gearbox - Set the 1st gear to far left (longest ratio) - 2nd gear multiplier 2,5 - 3rd gear multiplier 5 - 4th gear multiplier 7,5 - Set the 5th gear to far right (shortest ratio)
Second step, 6 & 7 speed gearbox - Set the 1st gear to far left (longest ratio) - 2nd gear multiplier 2 - 3rd gear multiplier 4 - 4th gear multiplier 6 - 5th gear multiplier 8 - Set the 6th gear to far right (shortest ratio) - Set the 7th gear to far right (shortest ratio)
Calculating formula: nhigh = highest number (shortest ratio) nlow = smallest number (longest ratio)
nhigh - nlow = n n / 10 = x x * gear multiplier = nratio nlow + nratio = nfinal
The nfinal number is the ratio that is used for that gear, so set the slider to the corresponding value.
Never touch the automatic setting of the top speed, as it will reset everything. When you wish to adjust the top speed of the car, just adjust the final gear value and look at the number in the brackets (top speed) of the highest gear.