With the new V1.9 version of ACC, it brings many new questions to answer regarding the changes that have been implemented by Kunos, as well as what our plan is for the new CDA4 versions of the Coach Dave setups.
Let’s begin and answer some of the more pressing questions:
What is the optimum tyre pressure range in V1.9 of ACC?
The optimum tyre pressure range is now 26.0-27.0 for all cars, including GT4 and single makes. Within that range the car behaviour will change slightly, with the lower range offering a bit more tyre flex and slip and the higher range feeling a bit more secure at lower speeds.
This is going to be very driver specific in terms of preference so you may find going slightly higher or lower on the optimal range works differently to other people. Importantly, the key thing we have found is to ensure the pressures remain very close front to rear. If you are on the low range on one axle and the high range on the other, it can make the car more unpredictable. So ensure you make both axles as close as possible.
Please note, for Delta subscribers, Delta will automatically adjust existing setups as well as new setups to cover the new tyre pressure range when auto install is enabled.
What is the optimum tyre temperature range in V1.9 of ACC?
The optimal tyre temperature range of the new tyre is 70c to 100c. The tyre operational window has been widened so that the tyres work better at both extremes of that scale.
Whilst the core temperature of the tyre will be more stable, the surface tyre temperatures will be more aggressive based on the lateral load placed on it. So expect to see your tyres cool down and heat up faster based on whether you are going down a long straight or entering a high speed corner.
Expect to tune your brake ducts to keep the core temperature within the optimal range, to ensure the tyres do not cool down excessively on the straights or peak too high in sustained cornering.
In some cases, with the way camber is now modelled, you will sometimes see the far outside edge of your tyre turning blue. As a general rule of thumb, try and keep your temperatures within a 15c spread across the entire face of the tyre.
What is the steering wheel rotation of the three brand new cars?
|Lamborghini Huracan GT3 EVO 2||620 degrees|
|Porsche 992 GT3R||800 degrees|
|Ferrari 296 GT3||800 degrees|
Have brake pads changed at all in V1.9 of ACC?
As with V1.8, braking performance between brake pads feels very minimal, so there is no real benefit running pad 1 during a race, even below 90 minutes. Overall, engine braking feels slightly more pronounced in V1.9 and brake bias necessarily does not need to be pushed fully rearwards.
Pad 2’s still feel very good and progressive with trailing and we’d recommend that over pad 1 for most scenarios. For very long endurance races where you want to try and avoid a pad change, running pad 3 can be beneficial, especially given the peak braking power of all pads appears to still be similar
As before, Brake Pad usage generally follows time constraints:
Pad 1: Up to 90 minute races safely
Pad 2: 90 minute – 12 hour lifespan, can be dependent per car and BB settings.
Pad 3: Very long lasting pad that has very little wear. Can last 24 hours in some scenarios which helps in endurance races.
Why is my car now going faster in a straight line in V1.9 of ACC?
The rolling resistance of the latest tyre in V1.9 of ACC has been globally changed. Whereas before, the tyre was very draggy and caused unrealistically slower straight line speeds, the new tyre has been tweaked to improve straight line speed for all cars across the board.
Expect to see gains upwards of 10 km/h on longer straights.
Anything else of note?
The head of the physics division at Kunos, Aristotelis Vasilakos, provided a public PDF that goes through the other major physics changes which you can download and read right here:
What can you change or experiment with on existing CDA3 setups?
We appreciate that it may take some time until we reach your preferred car with new CDA4 setups, so with our small window of testing that we have had, we have formed some quick tips that should improve existing CDA3 setups,. so that you can use them in races and still be reasonably competitively at that.
Reduce the negative toe all round if you are having rotation issues
Negative toe does appear to have quite a big difference on behaviour across many different cars and excessive toe, on an already quite aggressive setup, can lead to a lot of excess oversteer. If you are experiencing problems, try toe values of 0 to -0.2 front and rear to see how the behaviour impacts the car. Some cars may need to go closer to 0, others less so, others may need no toe changes if the setup does not already feel aggressive.
Be aware that excessive toe appears to have an influence on overall wear over a long stint and so it is best to experiment personally with that, as differing driving styles may tolerate it more than others
Camber can influence tyre temperatures and traction
Camber now appears to have a bit more of an influence on how the tyre distributes its heat as well as impacting the lateral stability and traction on the rear. Going to maximum camber front and rear instantly across all conditions may not be the way to go now.
Experiment with lowering the rear camber on tracks where there are a lot of traction zones to feel the difference in mechanical grip. It will also be worth trying in very hot and very cold conditions to understand how the temperatures are influenced both on the front and rear axle.
Stiffer roll bars seem to have a more pronounced effect on behaviour
With the changes in bumpstop behaviour and how that contributes to the chassis flex felt in game, stiffer roll bars seem to have a more pronounced effect on how the car behaves at high speed. I would recommend running very stiff front and rear as an experiment to see how that influences the behaviour of the car in sustained load phases after a kerb or bump strike from the road.
Both very soft and very stiff spring setups can work, be much more open minded.
It appears that a greater variety of setup approaches can work in V1.9 when it comes to a window where the car drives nicely. Both very soft and very stiff (depending on the car) approaches can work in terms of spring setup. Don’t be scared to go quite aggressive in either direction and then adapt your damping to compensate, stiff damping can be handy to control the pitch of the car based on what you have done with your springs.
Softer spring setups will squat a lot more under load and can give benefits on very low downforce tracks for the straight line benefits.
Bumpstops now don’t have infinite travel, travel range tweaked
Unfortunately, a bi product of V1.8 was the fact that bumpstops had infinite travel, which meant all of the loads went through the suspension of the car and never transferred to the body. This is why running very aggressive bumpstop ranges worked on some cars on the rear for rotation.
For kerb strikes and car consistency you may find that adjusting the front ride height slightly together with increasing the bumpstop travel range helps optimise kerb behaviour. For the rear, increasing travel range can offset some of the snappy behaviour on power you may experience with the new update on some cars, delaying that transfer of energy from the bumpstop to the chassis.
What is the release list of the cars in V1.9 of ACC?
The release list of the GT3 cars for V1.9 is as follows:
Ferrari 296 GT3 Porsche 992 GT3R Lamborghini Huracan GT3 EVO 2 Mercedes-AMG GT3 EVO BMW M4 GT3 Audi R8 EVO 2
- McLaren 720s GT3 EVO – In Progress
AMR Vantage V8 GT3
- Honda NSX GT3 EVO – In Progress
- Bentley Continental GT3
- Lexus RC F GT3
- Nissan GTR GT3
What is the naming convention of Coach Dave setups in V1.9 of ACC?
The following is the naming convention we will be using for V1.9 of ACC:
- CDA4 – V1.9 version number
- M4 GT3 – Example car name
- BAR – Example track abbreviation
- RS – Safe setup
- RF – Fast setup
- Q – Qualifying setup
Setup name examples include:
- Fast: CDA4 M4 GT3 BAR RF04
- Safe: CDA4 M4 GT3 BAR RS04
- Qualifying: CDA4 M4 GT3 BAR Q04
The version number at the end of the setup file, like the Q04 or the RS04 examples you see above, is in reference to the date of creation. The later the number the newer the version that setup was created and released by Coach Dave Academy.
What do I receive in my bundles for V1.9 of ACC from Coach Dave?
You get in total 9 files in a Coach Dave bundle at the very least for the GT3 and GT4 cars. These files include:
- Fast Race Setup – Full tank
- Safe Race Setup – Full tank
- Qualifying Setup
- Fast Race Motec Data
- Safe Race Motec Data
- Qualifying Motec Data
Will you still be doing Popometer data packages in V1.9 of ACC?
Yes, with every new setup bundle we release for Coach Dave Academy on V1.9 with the updated CDA4 setups, a full Popometer data package will also be uploaded on the Coach Dave Popometer subscription.
You can find the Coach Dave subscription right here:
Where can I find all the hotlaps you do for V1.9 of ACC with CDA4 setups?
Our dedicated Coach Dave Academy YouTube hotlap channel will publish all of the latest hotlaps from the CDA4 V1.9 updates that our team produce. You can find the channel link right here: