CVT Issue After Hondata Flash - Need Assistance with erratic CVT behvaiour

[gantira]

Car Details:
Car Model: [Honda HRV Turbo 22+ CVT, 6HM-U52 Indonesia]
Engine: [Simillar to Civic Si FE, L15C1]

Modifications:
Current tune: Hondata calibration with 250nm torque limit
Boost by Gear active
Traction control software enabled
Supporting mods: [Stage 1 only, just a drop in intake. Exhaust stock, IC stock]


Description of the Issue:
Since flashing the car with Hondata at a local dealer:

Elika Automotive Performance
Bursa Otomotif Sunter Blok E1 & E10
Jakarta utara 14230 Indonesia
81287678888
On site Reflash

(car was pretty brand new at the time, couple months old), I’ve experienced inconsistent CVT behavior during launches with overspin (wheel slip). Here’s what happens:

Launch with Overspin (Wheel Slip):

During launches (like a 0-60 mph test) whenever there's an initial traction loss for like at speed 20-30 km/h, the CVT won't hook up and hesitant to rev up to a higher rpm, like usually at full throttle at speeds of 40-50 km/h the engine revs up quickly to rpms above 4000rpm to the engine power and torque, but in this case it holds RPM at 3000–4000 and refuses to rev higher, creating a sluggish acceleration feel. This happened whenever after the front wheels looses initial traction, but it's not like a prolonged spin, but is more like a torque surge and then CVT suddenly doesn't want to rev higher. Even after that initial traction loss when the tyres regained traction, the CVT would still like delay the power at 3000-3500 rpms, before giving it again at 60-70 km/h. But here's the problem:

-At 60–70 km/h:
The CVT suddenly increases the gear ratio aggressively.
The engine RPM rises rapidly, bouncing off the limiter for 1–2 seconds before the CVT re-hooks and resumes normal operation.

-Observations:
This issue does not occur during normal launches (when traction is maintained).
The behavior has persisted since day one after flashing with Hondata and has not worsened, suggesting it is software-related, not hardware.

-What i think of the Potential Triggers:
Torque Limit Table: Currently set flat at 250 Nm.
Boost by Gear: Activated but i don't know if this would conflict with the torque limit and causing this CVT issue.
Traction Control Software: Activated, but still not sure because with traction off and on the problem still persist. (even with switching off via the Cruise control)
TCU Torque Protection: Possible interaction between TCU logic and Hondata’s calibration?

My Questions:
1. Torque Limit Table:
Is a fixed Nm torque limit across all the rpms problematic for CVT behavior, particularly in lower RPM ranges? Would a progressive ramp-up help smooth out launches and reduce stalling/delay?
Example: Starting with 220 Nm at 2000 RPM, ramping to 240 Nm at 3500 RPM, and peaking at 250 Nm in higher RPMs?

2. Boost by Gear (BBG):
How does BBG interact with the Torque Limit Table? Does BBG override or complement torque targets?
Could disabling BBG and relying solely on the Torque Limit Table improve CVT responsiveness during launches?

3. Traction Control Software:
Is Hondata’s traction control logic overly aggressive during wheel slip, causing the CVT to stall or delay ratio adjustments?
Would relaxing launch slip values or overslip percentages mitigate this issue?

4. TCU Torque Protection:
Does the CVT’s TCU apply its own torque limit, and could this interact with Hondata’s calibration to create stalling or inconsistent CVT behavior?
If yes, can this be tuned or adjusted to align with Hondata’s torque targets?

Additional Notes:
This issue is consistent and replicable during launches with wheel slip. The car otherwise drives perfectly under normal conditions.
There are no signs of hardware damage to the CVT, as the car was brand new when the issue started, and the problem has remained consistent.

My goal is to:
Mitigate this issue and optimize CVT behavior during launch acceleration.
Safely increase power for an incoming plan with a Stage 2 setup (targeting ~260-270 Nm torque) without compromising CVT reliability.
What I Need:
Guidance on optimizing the Torque Limit Table, Boost by Gear, and Traction Control Software to reduce CVT stalling and delay during launches.
Any insights into how the TCU torque protection logic interacts with Hondata’s calibration and whether adjustments are necessary.
Thank you for your time and assistance! I’d greatly appreciate any recommendations or insights from the Hondata's team or others who have faced similar issues.

[Spunkster]

Are you holding the brake to launch the vehicle?

[gantira]

As i mentioned earlier on my first post, i'm well aware that holding the brake to launch the vehicle will damage the CVT. So i never do such brake boosting. You might need to really read thoroughly, the first post i sent and this tiny problem that rarely happens but when it actually happens it just bothers me. I need an insight on how to put extra safety measure or precaution, to mitigate this issue and further protect the cvt, considering if i plan on a stage 2 up to stage 3 upgrade.