What Makes A Cherry Tune Different
While most tuners work off a "stages" model for their off-the-shelf tunes, we instead wanted to highlight our heavy focus on driveability and linearity in our tunes. We have spent hundreds of hours learning, testing and restructuring the internal ECU torque and airflow models to ensure that linearity, throttle control, and most importantly driveability are all maintained as a key priority. Given this, we felt that a more fitting naming convention would be one that comes directly from the internal ECU torque model. In this instance "CT400" comes from the ECU torque request being raised to 400ft.lb
It's important to us that our customer's car feels as smooth as stock, while still making the extra power and torque you would expect from an ECU tune, while making more power is obviously still important, it's never our primary goal when it comes to tuning cars (unless a customer has specifically requested it). If you don't experience this when running this tune and you meet the hardware requirements, please send us some logs so that we can look into this for you!
What to expect
Factory-level driveability
You shouldn't need to sacrifice drivability to make more power from your car. The driving experience from this tune should be as good as factory, if not better.
Linear throttle control
We have heard reports that some other tunes have more of a "light switch" feel to the accelerator, meaning the partial throttle to full throttle transition isn't a linear relationship. Linear throttle control is especially important for spirited or track driving, where you may want to be able to make 70% power out of a corner to maintain traction.
Engine Safety
Minimal changes are made to the factory limiters and internal ECU safety controls, meaning the ECU still has the ability to reduce power to protect itself when it needs to.
Torque Modelling
In our experience, correctly remodelling and scaling the ECUs torque and airflow models is important for anything that relies on the torque model (which is basically everything in the ECU). My taking this approach we have found there to be notable difference in mid-throttle power between Eco an N-mode, additionally we find that traction control will more effectively reduce torque to control wheel spin, without completely killing your driving experience.
What mods do I need?
Minimum requirements
- 93 Octane Fuel
- Elantra/Kona N Turbo Upgrade
- Downpipe (catted is fine)
- Intercooler
- Heat range 9 spark plugs - HKS MR45 recommended
- Sonata HPFP - Genuine OEM replacement is recommended
- Upgraded bypass (blow-off) valve
Recommended additional mods
- Intake with turbo inlet (any brand)
- Charge pipe upgrades
What's been changed in the tune?
RPM Limit
7050 RPM
Minimum Lambda/AFR Setpoint
0.79 Lambda / 11.6:1 AFR
High Pressure Fuel Setpoint
250bar - You need an upgraded/Sonata fuel pump for this, stock fuel pump doesn't even maintain a 200bar target
Absolute Pressure Setpoint
2.6 Bar total setpoint
This equates to 1.6bar / 23.2psi of boost at sea level
Ignition Timing
Ignition timing has been set to make use of 93 Octane fuel - we have seen up to 26* at redline on logs.
Torque Request
Raised from 270ft.lb -> 400ft.lb (This is where the tune's name comes from)
Torque by Gear enabled - 185ft.lb (1st) & 260ft.lb (2nd)
Pop Maps Improved
Increased both strength and duration by 15%
Minimum (start) RPM lowered
Downpipe Codes Deleted
P0420 and P013A codes deleted
Note, we don't recommend using an O2 fooler/spacer, you're better off installing your O2 sensor straight into the downpipe. We have seen issues with fuel trim and mismatching AFR request and actual when using a second sensor spacer.
Exhaust Flap Management
Always open in N
Closed at idle in Normal/Eco
Idle Speed
Minor changes to several maps to make idle more universal
Additional RPM added for Anti-Stall take off (clutch out RPM increase)
Additional Notes
If you would like any changes made to any of these settings, we offer a custom tuning service on our website here, otherwise stay tuned for further tune revisions as we upload more onto the SXTHNK portal.
