I have been working on trying to improve the gearing aspect of my tuning and would appreciate it if anyone would care to try out my latest attempt at gear tuning ???
The car i used is the R2 class Nissan R390 GT1 and the track it is tuned for is Road America . I have been working on the tune these last few weeks and while i admit i will never get the perfect tune , i reckon its not too bad . Its mostly gearing im looking feedback on , actually the bump and rebound aspect of tuning is another grey area for me too , but if you think anything else could be improved i would certainly like to hear that too . I have uploaded the tune onto my SF and its free BTW , but if you wanna see the settings and build in order to fine tune it yourself , i shall post the details below . . .
Upgrades
1st Restrictor removed to achieve 662 HP , 530LB/FT Torque
Race Driveline upgrade
Stock tyre compound
Max width upgrade for both Front and Rear tyres
Rims - 5 Zigen FNO1R - C
Stock Rim width Front and Fear tyres
Settings
Tyre Pressure - Font and Rear both 28.5
Gearing - Final Drive 3.86 1st 2.89 2nd 2.03 3rd 1.46 4th 1.10 5th 0.82 6th 0.82
Alignment Camber Front -1.0 Rear -0.8 Toe Front 0.1 Rear 0.0 Caster 5.9
Anti Roll Bars Front 13.8 Rear 11.0
Springs Front 336 Rear 364
Bump Front 1.6 Rear 1.8
Rebound Front 8.0 Rear 9.0
Aero Front 311 Rear 436
Braking 47 % Pressure 130 %
Differential Front 30% Rear 10 %
I have been getting regular times of between 1:59:5xx to 2:00:xx for comparison to any times you may achieve . Like i said b4 , its not the " perfect tune " but its not too bad and im sure it can be improved , so thanx in advance if you care to try out the tune . Any feedback , good OR bad is appreciated equally .
Hey,
I tried out the tune and the base was very good. There were some occasions when the rear slipped out a bit but for that I adjusted the anti roll bars. I also turned up the aero as with that, I gained over a second a lap. I got a 1:55.7 and can go even faster. I’d take a click of rear camber off too, that might keep the rear in check.
Try these gears: 6.10 FD, then: 1.26; 0.99; 0.82; 0.69; 0.61; 0.55
The car is peaky so I put all the gears in, making 5th and 6th shorter just to stay on the power.
Great effort though, I like it 
I’ll aim for a 1:54.
Thanx for the quick response Motorhead . I tried out the gearing and the other suggestions you made . Here’s how it went for me .
The gearing , i noticed you went for max acceleration ( is that best option in your experiences ??? . The gears , were they set to be above the torque RPM @ 4400 ??? is that the main aim of gear tuning
The Anti Roll Bars , i reset them and refined the settings to Front 18.2 and Rear 14.0
I increased the Downforce to 70% front and rear and achieved a time of 1:58:783 ( which was a new PB ) . Then i thought about tinkering with the distribution of downforce . I would usually just add XX % of the set amount available for the front and then the same XX % of the set amount available to the rear . So i thought i would choose a specific amount of downforce and then add it as per weight distribution of the car im tuning . In this instance , i went with 280lbs of downforce and added 137 lbs to the Front and 143 to the Rear . I had to tweak the ARB’s a bit and once i got them sorted ( the settings above ) i had another go at Road America and managed a time of 1:58:3xx for a new PB . I am gonna give it a good run out in the next few days to see just how much i can reduce my times .
Thanx again for your advice Motorhead , it was much appreciated
You’re welcome
I would encourage higher downforce, and very high if not max front especially. That higher front allows more potential cornering. As much as Road America is a ‘speed’ track, you’ll find cars that accelerate well will always do well, which is why downforce is critical. To get in and out of the corner faster and to launch yourself down the straight. Higher rear downforce allows better acceleration off of corners too. I set that 1:55 with full aero.
About the gears, I set them so you’re on the power as much as possible. For cars with wide power bands, torque is useful for slow corners when your gears are set perhaps quite long. Example of that is the Honda Lola, You use 3 or 4 gears only on most tracks and first can go up to 110 ish in some cases, however it has the torque to cover. But yeah, I prioritise being on the power for as much time as possible, which is why I hate really peaky cars 
Thanx Motorhead , but im still a bit lost ( bit of a thicko tbh ) . I still havent a clue as to when you go outside the power band . I have been basically tuning it by ear , keeping the gears as close as possible and suiting gear changes ( usually from 2 nd to 3rd to 4th ) to suit track position . I assume there is a point where you are outside of the power band . Has it to do with the amount of torque left for that particular gear , for example ??? . I only ask cause i would like to improve this side of the tuning . .Thanx again for your assistance mate .
When he says the car is out of the powerband, that means the power reading in the telemetry is less than the car’s total power. Say your car has 600 horsepower. You want to tune the gears (after 1st, of course) to be as close to 600 horsepower as possible for as long as possible.
Thanx , Bulin . Much appreciated mate .
1 Like