Clever box of tricks has made a big difference to ZX-10R’S performance
For the past six months I’ve been running a Rapid Bike fuel unit in my ZX-10R. The idea is it takes a reading from the exhaust’s lambda sensor and tells the ECU what fuel/air mixture to deliver.
The £414 system constantly selflearns, so after all these months and over 8000 miles, it’s had plenty of time to bed-in. I’ve been using it with a stainless Akrapovic exhaust system (with a carbon can) with the baffle in and out, all from Performance Parts Ltd (www.performanceparts-ltd.com).
Not only is the Rapid Bike popular with riders like me, who’ve fitted complete exhausts, many use it with standard systems with ‘de-cat’ pipe sections to do away with ultra-heavy Euro4 catalysers.
A generic fuel map for your make and model of bike comes standard with the Rapid Bike and that’s good enough to be going on with. But Rapid Bike suggest recalibrating the system after a few hundred miles to fine tune the mixture, using their free downloadable software. Do the same again once or twice more and the fuelling is damn near perfect.
Like any Euro3 or 4-meddled machine the ZX-10R’S fuelling is too rich or weak in certain parts of the rev range, to get through noise and emissions regs. That adds up to snatchy fuelling and a lazy midrange. The Rapid Bike restores the fuelling to how Kawasaki intended, so the throttle response is flawless and the motor spills smooth power from tickover all the way to its 197bhp peak with the baffle out and 175bhp with the baffle in – the restrictive little blighter.
I’ve tried several ZX-10RS with the factory race ECU fitted and it does boost midrange even more, but it can’t match the Rapid Bike’s overall smoothness, which makes it the best option for the road.
‘Now the throttle response is flawless and the motor smooth’
No need for an osteopath… it’s actually comfy
Free downloadable software helps you recalibrate the system as you go
There’s no need for dyno set-up, the system learns as you ride