Honda CBR600RR Project Bike Engine Notes
Friday, November 2, 2012
After a few months of preparation by the motorcycle tuning aces at Camarillo, California-based Jett Tuning, our Honda CBR600RR project racer was finally ready to hit the racetrack. We raced it last September with the WERA Motorcycle Racing club at Southern California’s Auto Club Speedway. Here are some concise notes regarding the performance aspects of the machine with an in-depth reviews coming soon:
ENGINE POWER / TUNEABILITY:
While the CBR600RR has some serious mid-range ‘oomph for a 600cc Inline Four, it doesn’t generate an abundance of peak power. In an effort to get a little more juice, without breaking the piggy bank, we fitted a Yoshimura RS-5 Full Exhaust
(stainless-steel header and mid-pipe, carbon fiber muffler). The fuel-injection and ignition timing maps were then modified via a Dynojet Power Commander V
. We also poured in a few gallons of VP Racing Fuel’s new nostril burning MR12 race gas.
The difference compared to a stocker was considerable with the engine offering more pull at all rpm. Top-end power still wasn’t spectacular as it flattened out toward redline, however it generated power evenly with lots of over-rev—giving the rider some leeway. I was also amazed with the level engine tune-ability courtesy of the Power Commander. With it installed you can tune zero, two, five, 15, 20, 40, 60, and 100-degree throttle angle openings as well as every 250 rpm. Only problem is that you need a person capable of inputting the right numbers in the right tables on the computer screen and that’s where Jett Tuning comes in to play. It’s crazy how quickly, owner John Ethell, can modify the maps. Like I’m talking about less a couple minutes right at the track. I guess it’s no surprise as Ethell has wrenched for some of the greatest pro racers ever including Miguel Duhamel, Ben Bostrom, Jake Zemke and Nicky Hayden just to name a few.
We tested a lot of maps during practice and got the bike’s fueling and throttle response dialed-in to perfection come race time which was impressive considering we had some fuel overeating problems due to the 110-plus degree ambient temperature (more on that later).
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