So I’m a pretty crap tuner it seems. I’ve mostly stuck to using downloaded tunes but I find most are made more oversteery for my preference, so I started using the forzatune app as it allows a base tune that I am able to fine tune after, and it also allows me to increase over/under steer as I see fit.
One thing I’ve noticed though, is that the tire pressure and the diff settings never change, also the braking pressure.
Tire pressure is always set to 28, diff (rwd) is always 60% accel and 10% deccel and brake is always 85% pressure and usually 54%front.
Are these figures ok to use? Do any of you guys start with a generic number or is this, like most other things in tuning, dependant on the car/track/drivestyle? And do you have any advice for fine tuning these numbers? Also will changing these figures affect the settings that were calculated for the rest of it like arb and spring stiffness etc? I’m just wondering what figures are ok to change and which ones should be left alone or if there are other generic values that can be used that others have found work well.
I appreciate any help as I’ve been trying to figure out this tuning thing for awhile now to not much avail.
My numbers that I start with aren’t close to those… 40/5 diff 55/140 brakes and those are very common numbers people use. But it’s more about how u drive to know if it works for u… try those numbers on your current tune just remeber brakes will lock up quicker
By using those numbers (or any others) will it affect the other figures I’ve used for like camber and arb and whatnot? Like having more brake pressure or diff settings will it mean fine tuning anywhere else or does it work pretty independently from the rest?
Those numbers shouldn’t affect other areas of the tune, but you never know. For example, I recently had a braking issue and it wasn’t caused by the brakes but the ride heights. If your brake pressure is too high and your wheels lock up too early, your car won’t steer into the corner and it affects your performance. That said, you shouldn’t have to go change the numbers on other areas based on these two.
Typically, I set my differential to 15/35 as a base and go from there. For brakes I leave the distribution 50/50 and set the pressure to 135 and fine tune it once I get it into the test drive. In most cases I do this for every single (RWD) car I tune. On some cars it stays the same on on others I end up changing it, it’s simply a base that I know works well for me. The tune calculator has been set up similarly most likely and is just giving you a good base.
Sweet, that’s what I was after, I was just worried that the calculator had worked out everything based on those figures and that by changing them id have to adjust somewhere else accordingly. Thanks for the replies, with any luck I’ll be able to start diagnosing problems better and be able to start tuning to my own preferences soon. Just a lot to take in at once.
tire pressure differs from car to car,best way is to go in test drive… do 3-4laps then bring up telemetry and set your tires to 32-33psi when hot,usually around 27-29 in the tune.
brake is all preference,do you use abs? if you do,do not run high pressure like johnson has said because you will lock up,try around 105% pressure for abs,if you dont use abs then anything from 110-140% will work. i usually have slightly rear bias brake settings like 48-47% i find this helps turning while braking,but its just preference. try your diff around 20-40 accel,10-40 decel. this usually differs from car to car,and if you run tcs or not. brakes,tires,diff wont affect the camber or arbs springs ect. i do recommend trying to learn to tune by feel as a calc can only help so much. you can manipulate the over/understeer feel alot with the arbs. if you want more oversteer lower front,raise rear. if you want less oversteer raise front,lower rear. high camber often works on this game,upto around -3.5. hope this helps alittle.
I tried this calc. its camber settings are way too low( 1.8 front -2.3 rear)… is what it always gives. Also the caster is around 6.2 for most cars, Like General said run higher camber… but your gonna have to lower the caster to get it to turn in better.
I generally have a base tune for everything I start on, I can’t always be bothered fine tuning but I do for the cars I really like, I usually go
Tyre pressure
28
28
camber
2.0 - 3.0
1.5 - 2.5
caster
6.0
gears I’m not so great at - I just usually if I put a transmission in look at the best accel time, until the speed doesn’t reduce to much or visa versa
springs I reduce by 25% then fine tune
ARB - for rear wheel drive I would go
15ish
25ish then fine tune after trying it
ride height I usually put to the lowest setting
rebound I usually mess around with quite a bit then I set my bump stiffness to about 1/3 of that, then fine tune if it needs it
aero can be quite important if you have it on, too much and your car will grip but be less responsive and too little and the car will respond but just slide out
diff settings to me are still a grey area, with a rear wheel drive car I usually go with around 25 accel 20 decal and increase or decrease depending on how much the back end kicks out, front wheel drives usually have high accel 60% plus, AWD is a little strange depends if you like the Rear wheel drive feel better or the front wheel drive better, I usually go more towards the rear but I think you just have to mess with it quite a bit
I get board of tuning a car after an hour or so I never go to deep into tuning, trying to get 100s of a second of a time and make it noticeable is quite hard, depends if you can consistently lap the same lap times, then if you change something it consistently laps slightly better but this is a lengthy process
Thanks all for your replies, Ive just finished tuning my Ferrari California using the advice you all gave as well as following Moneyman300’s youtube channel.
I find that anything beyond -3.0 camber gets too hard for me to handle but -2.5 and -2.0 (5.0 caster) seemed to work well. I cant get the hang of the Toe, I went with -0.2 on the rear but the effect it had sometimes seemed drastic and other times didnt seem to be noticeable at all, just depended on which corner I was on and how I took it (braking or not, releasing accel or just powering through fast turns) so finding the right setting was difficult.
I did find the braking settings to be helpful, I have a few cars that flick out at the back end when trailbraking and never knew why until now, The brake pressure I seem to be favouring 75-85%, a lot lower than most, I think Im quite heavy on the brake, plus I drive auto so I cant downshift to aid in slowing down so my braking is a lot more full on, higher settings was causing too much lockup. The diff settings were a massive improvement though, running 30accel and 8deccel, much lower than the old 60/10 and finding it a lot easier to throttle out of corners and not having the rear flick out when entering.
Also picked up some stuff about springs and ARB and put it to use, pissed the tuning app alltogether, will only use it for gearing within the powerband and try get the handling done by feel.
I made a post in this thread about the ferrari with all the tune specifics posted on it if your interested, Thanks again for the help.
(posted a #100 time on one of the new rivals with my newly tuned BMW M3 ***Now #277 
, wont be there for long but better than the #5000+ times I normally set and not bad for an auto driver)