My latest attempt with explanations

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Based on some replies from another thread that I started (thanks to ERS JOHNSON, JEZNASTY, RelaxedPRKid and GDR 4 3L) I’ve put together another tune for which I’d love to get some feedback. I’m going to explain some of the choices that I made while tuning so that you may confirm whether or not I’m on the right track in a given section.

The car is the 2008 Ferrari California. I screwed around with it for a while until I could drive it to the point that it felt fast and was on the edge of out of control (for me). What I got was a car that I think is a heck of a lot of fun to drive. I tested it on Nurburgring (full) and registered my first clean lap on this track with it (during the test drive of course, not official on the LB…). The time wasn’t all that amazing (10:31 which would be around #800 on the LB for B class) but it was really fun to drive, and some of that time could easily be made up by a better driver. You can download the tune under my GT (Flavaham) and it’s called Just Fun, (because, as I said, it was FUN! haha).

Anyhow, here’s the build/tune. Feel free to bash away at it. I’m sure I can get some more out of it if I know what I’m doing so I’ll take any and all criticism on this one!
Thanks again for all the help guys!!

The Build:

Conversion - All Stock

Engine - Sport Air,

P & H - Race Springs and ARBs, Sport Weight Reduction

Drivetrain - Race Driveline, Race Differential

Tires/Rims - Street Compound, 265 Front, 335 Rear, RO_JA R2-7 Rims

Aero - Forza Front and Wing

Any thoughts on the build are welcome. I wanted to go with Race exhaust for weight reduction + HP but it wouldn’t fit in the PI. I thought about losing some tire for this but the thing already gets on the edge of crazy so I stuck with the grip.

The Tune:

PSI - I read up on the Tyre Pressure thread and wasn’t sure if I wanted to use that formula or not. Another thread simply said to try to get your tires to 32. So, I set them to 28 and after a few laps checked in on them. They were at 32.4 on both ends consistently for most of the lap. I backed out, set the units in HUD to metric, went back and clicked both back four clicks to get them to 27.6. Tires were at a steady 32 after that. Feel free to suggest other methods here.
27.6
27.6

Alignment - For this, I checked the tire temps in the straights. I adjusted camber until the inside temps were a touch higher than the outside. That’s what I got from the reading up on this anyway. (Did I interpret that right, JEZNASTY??) Also, for caster I set it all the way down and came up a bit until I could control it coming out of a turn. Seemed to feel pretty good at 1.9 but I haven’t seen a lot of open source tunes with casters this low. Is this way off???
-3.4
-2.7
0.0
0.0
1.9

ARBs - For this, I left the rear stock and set the front to 15 to start based on some help from ERS JOHNSON. (Thanks!) I then used some advice from GDR 4 3L to adjust them from there.
10.70
20.16

Springs - I wanted to go lower for ride height but I was told that ride height should usually not go below 4.5 so I left it there. Overall, this spring setting felt pretty good.
845.3
812.8
4.5
4.5

Damping - I went with what ERS suggested here as well and left it. I’m still not comfortable adjusting this for some reason. Seems to me like this and the springs kind of control the same things. I’m sure I’m wrong there, but I still don’t quite get this one. Either way though, the car still felt fun to me, so I’m cool with that! If someone wants to tackle this I’ll gladly read up. I got some help on this already but apparently this part went in one ear and out the other…I’ll keep reading…
13.0
13.0
1.5
1.0

Aero - Maxed. Didn’t screw with it after that.
100
200

Brakes - I think this one is all dependent on the driver. I don’t use ABS. This setting got me where I wanted to be. For the record, here’s how I was told to set this: Set your pressure where you think you like it (125% in this case) and then move the balance up and down to find the shortest braking distance for 100 MPH - 0. Using that formula I came up with this. This method has served me well so far so I think I’ll stick with it unless told otherwise.
43%
125%

Differential - I started with 40 Accel and 8 Decel (again, credit to ERS here). According to what I was reading (by JEZNASTY) I came up with the following. If the car is sliding out in a corner when trying to throttle through, lower the acceleration. So I did that until it felt good. Next, the car was slipping a bit into the corners so I raised the Decel. The figures here reflect what I thought felt right.
23%
18%

So that’s it! Definitely not the best tune ever but I feel like I put a car together that I can drive and have some fun with. It seems that the cars that I like to drive are some of the more challenging to tune. Oh well. I dig this car and want to drive it! So I’m gonna tune it! Haha. Thanks for any input you may have and maybe I found something in this car that you can use!(?)

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I would of probably gone for lower springs in the rear and on rebound but the camber and caster look good for what I tune and I may of gone for a slightly higher decell on the diff .

What class is this tuned for (not near my xbox at the moment so can’t check )

And I would of droped the ride height to the floor then back up just one click .

Bakes I think you have the wrong way round the slider needs to be towards the rear as the bigger the slider portion towards the rear the more brakes are the front it’s backwards and confusing I was caught out with that one at the beginning too.

3

It’s B Class.

So, brakes should be biased toward the drive wheels? For some reason the best stopping time was where I have it set. I’ll look at that. Maybe I need the best stopping time for the rear?

I’ll lower the springs in the rear and see how that does. Would you lower both F and R rebound or just the rear, and why?

I don’t use TCS. Will that change how the differential feels? Perhaps that’s why I’ve got it set the way it is?? Not sure. And I’ll fiddle with ride height and see what happens.

Thanks again!

4

Don’t use the benchmarks in the brakes they are wrong and although look like it’s braking better it really not I made that mistake too

5

Sorry I missed this . Running TCS in this game will make you faster and run better I know a lot like it off but many who like it off went to on as it is faster on lap times. I run ABS also but I do turn of TCS for 4wd or it bogs down in corners .

I would lower the springs in the rear why ? Because it’s a rear wheel drive front engined car so the rear springs will have not much weight to balance so if these are to hard your car will slide and be bouncy. Again I would lower just the rear rebound to for the sane reason but increase decell on the diff and lower the accell try .

Diff try

10acell and 40 decell .

Try springs
845.3
650.0

Damping - try
13.0
9.0
2.4
1.3

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To explain brakes reffer to gtfoots post about brake bias I will bump the thread so you can read it . Be up top in a second !

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Awesome. Thanks!

I put in some of your recommendations to check it out. I think it’s a little more lose now but seems a touch faster. Not sure I’m a good enough driver to handle this thing yet!! Haha. I’ve really gotta work on being lighter on the throttle…

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Camber - Most recently I have been increasing my camber. Worm’s guide suggests up to 25 degrees difference from inside to outside. I aim for around 15-20 difference on front and around 10 on rear (once tyres have settled).

PSI - there are various explanations of this now. ONR Roadrunner does not seem to aim for a specific hot PSI as far as I can tell. Others use hot PSI targets. I have found hot PSI on the front of 33.5-34 and a little less on the rear seems to give me best grip. Any more than that and the grip levels seem to drop.

You have understood the diffs well.

9

Flavaham,

Just got a chance to review your build, and, I would suggest a couple of minor changes (kinda freebies). Pick the Sport transmission and it gives you PI back, then, instead of your rims (-6 lbs), swap to a -9 lbs rim (ex. RT Sport). You will end up with less overall weight and a sport tranny to pick your Final Drive which can help you as well. I will review the tune as well and provide some feedback per what I would do on this car/build. You can also add cage (or less) for better handling and get some PI for HP (or rim size, less weight on rims brand, etc…) later on, once you feel comfortable with the drive.

10

Thanks guys! Lots of good info in this thread! I will be away from the game for a few days but will consider all of the above tips. Thanks!