Overcoming 120km/h restriction

[Ikak]

After installation of the 500cc BB kit and the initial 1000km running phase my Meteor 350 is now a BEAST of a machine, and the bike pulls difficult inclines like nothing. When cruising on a plane reaching a speed of 120km/h is quick and easy - but it stops there.
Even now that the PTv4 ECU is connected.

Before even considering the BB kit I was looking on ways to overcome the 120km/h electronic restriction set in the stock ECU.
When talking to Race-Dynamics about it they promised the PTv4 is able to solve that problem.

SInce I got the ECU through you I cannot request support from Race-Dynamics.
Changing chain gear ratio doesn't solve this either as the stock ECU reads speed from the ABS.

Is there a solution?

 

[sam2019]

About race dynamics, I can always ask for you via whatsapp. however, I have my doubts the PT can overcome the rev limiter.
I dont know a solution but maybe someone else does. I will shift this from the exclusive dev section to the open board. Maye we get lucky. I will also check with RD and ppl I know who do tuning here.

 

[sam2019]

I found 2 workable solutions:

1. Modify the Speed Sensor (ABS Tone Ring Hack)​

• How it works: The ECU derives speed from the ABS wheel speed sensor's tone ring (a toothed ring on the front wheel hub). By reducing the number of teeth/slots on the ring (e.g., filing or replacing with a custom one with fewer slots), you "fool" the ECU into reading a lower speed at actual high speeds, delaying the limiter's activation.
• Pros: Simple, reversible, no ECU changes needed. Users report pushing past 130-140 km/h.
• Cons: Affects ABS accuracy (if equipped); requires mechanical skill or a shop. Not ideal if your bike lacks ABS.
• Implementation: Source a custom ring or modify the stock one (common on aftermarket forums). Test incrementally to avoid over-filing.
• Suitability for your setup: Works well with Powertronic, as it doesn't interfere.

​

2. Powertronic Remapping with R-Tune Software

• How it works: Use Race Dynamics' free R-Tune app (Bluetooth-connected to your Powertronic V4) to create custom ignition/fuel maps. While it won't delete the limiter outright, you can counteract its effects by advancing timing and enriching fuel at high RPM/speeds (e.g., above 5,500 RPM), potentially squeezing 10-20 km/h more before cutoff. Some users report 130+ km/h with aggressive maps.
• Pros: No hardware changes; leverages your existing ECU. Increases rev limit to 12k-15k RPM for better top-end pull.
• Cons: Limiter still kicks in eventually; requires dyno testing or trial-and-error to avoid detonation (especially with big bore).
• Implementation: Download R-Tune from racedynamics.com, connect via Bluetooth, and load a high-RPM map. Start with preset "Race" maps and tweak based on data logs.
• Suitability for your setup: Ideal since you already have Powertronic—many Classic owners use this for modest gains.

some say the bigger sprocket works - which points at rev limiter, not speed limiter - but I dont know.

 

[Dool]

On the Dyno my Bullet does over 130kph, but the front wheel is not turning?
Maybe the ABS sensor is the cause.

 

[sam2019]

About race dynamics,

I have to say: their "support" really sucks. You can get answers to questions that are related to installation, anything else they do not feel is their responsibility. Well, I guess technically they are right but I still consider it very poor customer relations. However, at the moment they seem to have an exclusive position with regards to ECUs for the BS6 bikes unless one goes the "reprogram the OEM ecu" road - which is expensive and I dont know anyone who has the equipment for the j-engines (I do know someone for the LS-410).

 

[Moos1964]

After installation of the 500cc BB kit and the initial 1000km running phase my Meteor 350 is now a BEAST of a machine, and the bike pulls difficult inclines like nothing. When cruising on a plane reaching a speed of 120km/h is quick and easy - but it stops there.

Yes the best solution is to place a throttle body from a Hunter with number RLT00187. Than the limiter is gone. My standard meteor did 129 kmh with the Hunter throttle body and with hitchcock camshaft 135. Depends on the headwind force.