What does EXUP valve do?
What does EXUP valve do?
This is a system that employs a variable EXUP valve in the muffler that can change the configuration of the exhaust duct in a way that controls fluctuations in exhaust pressure at the moments of overlap between the intake and exhaust valves in order to improve intake efficiency, boost power output and improve fuel …
What is a Yamaha EXUP valve?
The EXUP system was a four-stroke power valve system, placed in the bottom-end of the exhaust’s downpipes to fool the pipe into thinking it was the best ‘length’ for both mid-range and high-rpm operation. For Yamaha they devised a system that would open and close a series of valves in a section of exhaust.
What does EXUP stand for?
EXUP
| Acronym | Definition |
|---|---|
| EXUP | Exhaust Ultimate Power |
| EXUP | Execute Exchange Unit Program |
| EXUP | Exhaust Ultimate Powervalve (Yamaha Motorcycles) |
What is EXUP servo motor?
What does an exhaust servo motor do? This is a simple butterfly valve that can open or close to change the amount of exhaust flow. Connected to this valve is a set of cables that run to the other part of the system, the servo motor.
Do 4 strokes have power valves?
A four-stroke power valve is a device fitted to four-stroke engines that constantly adjusts the internal diameter of the exhaust system to better suit the speed of the engine. Yamaha was the first to develop such a system, called the Exhaust Ultimate Power Valve (EXUP).
What is the purpose of a servo buddy?
Servo Buddy allows for a complete elimination of the servo motor, valve & cables. Utilizing the Servo Buddy improves reliability by eliminating issues when the factory servo motor fails.
What is an Exup eliminator?
Description: Graves Motorsports Universal EXUP Eliminator is a simple plug-and-play application that allows the removal of the EXUP valve and motor without setting the “Check Engine light” being activated when using a full racing exhaust.
Do I need a servo eliminator?
You don’t need the Servo Buddy unless you eliminate or unplug the exhaust servo control motor. The only reason to unplug it that I’m aware of is if you eliminate or disable the flapper valve in the exhaust. Usually this is associated with installing a racing collector/header.
What is compression stroke?
Definition of compression stroke : the stroke in the cycle of an internal-combustion engine in which the gases are compressed before firing.
What is suction stroke?
Definition of suction stroke : the stroke of the piston in an internal-combustion engine that effects the drawing in of the gaseous mixture to the engine cylinder.
Do you need a servo buddy for slip on exhaust?
The Servo Buddy is a must-have when switching to an aftermarket exhaust- and even works great with a factory system if you want to eliminate the servo motor and fix the exhaust valve in the open position. All other models (including the 2019-2020 S1000RR) just need one Servo buddy.
Do I need a servo buddy for a slip on exhaust?
Vendor. You don’t need the Servo Buddy unless you eliminate or unplug the exhaust servo control motor. The only reason to unplug it that I’m aware of is if you eliminate or disable the flapper valve in the exhaust. Usually this is associated with installing a racing collector/header.
https://www.youtube.com/watch?v=JwKBaAaQ0vs
