which exhaust did you order?
The Graves EVR system.
They are just coming out with it, it comes with a titanium Exup valve and map for it, they claim its an excellent exhaust.
What Chuck Graves the president of Graves Motorsports has to say about the release of Graves’s newest line of exhaust systems, EVR and the technology behind it.
“The EVR or Exhaust Valve Type R is and electronically controlled valve that improves drivability at small throttle and low RPM ranges where it matters most to the rider. The systems can also be utilized to reduce sound by a significant amount without reducing maximum power output.”
What makes the Graves EVR different than the stock exhaust valves that racers commonly remove when the stock system is replaced with an aftermarket race system?
That’s pretty simple, we install it in a race system and tune the electronics to maximize efficiency. The current trend of sport bike enthusiasts has been attracted to short silencers simply for looks. Power output and drivability has been sacrificed exclusively for the trendy look. Secondly the sound levels of many of these systems has reached the level of irresponsible and annoying for even the youngest riders. The aftermarket has responded with sound inserts to bring these short power robbing systems to an acceptable level. The real drawback to this is that once the sound inserts are installed the rider can now really feels the negative effect of the system in overall performance decline substantially. In most cases, I’d say 99.9% of all motorcycles that I have tested, the power output and throttle response is now far worse than the stock exhaust. With the EVR by Graves we solve all 3 issues, the power output, throttle response and the sound.
Who else uses this system on their race pipes?
Only Factory Moto GP teams are using it at the moment. Most of them all are well hidden!
Why hasn’t this been done by the aftermarket before? Again that’s pretty simple. Cost! To drive the valve requires hardware and software. At minimum you need an ECU capable and a motor. The emergence of ECU flashing has given us the ability to do this at a reduced cost because we can now control the stock ECU motor controls. We have designed our EVR systems to accept the stock motor and cables. This makes for a really clean setup.
So is the FTECU flashing system is required to optimize the EVR exhaust system?
That is correct. Anytime you replace the stock exhaust system with an aftermarket racing system it requires changing the fueling. In addition to air fuel requirements the modern motorcycle engine control systems cannot be optimized by piggyback system so the flashing of the ECU is common place. Graves has partnered with FTECU to manage these strategies to enhance our exhausts systems performance just as a Moto GP team would do.
What if I already have a flashed ECU?
What Graves has been telling our customers is that they should purchase the FTECU flashing kit when they purchase an exhaust from Graves. Graves provides maps for the user to install in their motorcycles ECU. We tell them that by having the FTECU flashing system in their tool box they can update their ECU whenever Graves publishes a new map. If they have the system already then an updated map is all that they will need.
For which motorcycles is EVR currently available?
We are developing every day to add more models to our list, but as of printing, we offer EVR for the following:
2015 – 2017 Yamaha YZF R1 2016 – 2017 Yamaha MT/FZ10 2017 Yamaha YZF R6
