Intro: All superchargers have bypass valves whose job is to open when you don't want boost. The bypass valve essentially controls your boost level, but until recently they were not widely used for boost control. This is because most bypass valves are vacuum actuators and boost control required intricate aftermarket controllers.
In recent years that has changed!
Supercharger control systems (like the standard Smoothboost knob) replace the vacuum actuator with a servo, but still rely on fixed boost levels. You turn a knob, and it creates a "ceiling" for your boost—limiting you to 10psi, 12psi, or 15psi.
But here is the problem: As soon as you smash the throttle, the bypass valve slams shut, and you get that boost instantly. On a high-horsepower street car, this instant hit "shocks" the tires, breaking traction immediately.
The Kaizen Relay Difference: Dynamic Ramping instead of just a static limit, the Kaizen Relay Boost Ramp Controller works alongside the SmoothBoost system passively listening to your vehicle's CAN bus data to monitor three critical things:
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Engine RPM
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Throttle Position
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Front Wheel Speed (Crucial!)
By monitoring front wheel speed, the system knows exactly how fast the car is actually moving (unlike rear wheel speed, which just tells you how fast your tires are spinning). It then progressively "ramps" the bypass valve shut based on a driver selectable 12-position switch.
The Result: You can leave the line at 2psi and automatically ramp to 18+psi by the time you hit 70mph, keeping the tires glued to the road the entire time.
We have Plug-and-Play kits for several applications.
Click Here to Read Full Video Transcript
so in the previous video we were talking about fixed boost levels using the smooth boost control knob that's supplied with the smooth boost kit so we did a poll with the bypass valve fully open and we achieved minimum boost so this is this combo is toied for about 18 to 19 PS with the bypass valve fully open it'll only make about three and a half PSI which results in like 489 horsepower then we can have a fixed boost level that creates a little bit more boost and then another boost level and everything in between but these are fixed boost levels and then the green one that you see is as if you didn't have a smooth boost controller on it at all and the bypass valve just goes fully shut as soon as you go full throttle and you make max power so now we're going to talk about how a Kaizen relay Works alongside a smooth boost controller to ramp boost in so I'm going to take away kind of these middle levels and now all you'll see that's bypass valve fully open meaning minimum boost down here and then fully closed as if you didn't have a smooth boost controller making maximum boost up
Kaizen Relay Overview here then we use the Kaizen relay that passively listens to can messages such as engine RPM throttle position and most importantly front and rear wheel speeds to ramp boost in so with our kit we
12 Position Trimpot provide a 12 position trim pot that has preset boost ramps that allows maximum boost or uh and minimum boost and everything in between uh up top but it ramps it in based on front wheel speed the reason we use front wheel speed is if it did start to take the tires off like let's say you used rear wheel speed and you hit it with too much power and you spun the rear tire as the rear wheel speed increases the Boost would also increase making wheel speed worse so we use front wheel speed and here's just an example
Boost Ramps so on this particular poll we went we started with minimum boost down here so we're Full Throttle at this point we're making very little boost pressure and then we ramp it in from we start ramping it in at 40 m hour so you can see that's why it's a little bit higher than this minimum boost because we've already started to ramp it in so the middle graph this shows vehicle speed so we're Full Throttle we start to ramp boost in and by about 70 M hour we're at full Boost so this way you can do a roll race where you can start even in second gear even with a thousand wheel horsepower car on the street with no prep you can smash the throttle and wait until you build up some vehicle speed and you don't have this abrupt torque change so this was switch position one then we did another pull back to back just by clicking over to switch position two and you can see a different boost ramp so it's the same for 40 to 70 mph boost ramp but it's different Duty Cycles so this is just an example these are all pre-programmed you plug in play kit all you do is plug it in it's completely supplied and pre-programmed from us and all you need to do is Select which switch position you want you can always revert back just by switching to switch position zero and it'll be full Boost all the time we've got everything in between so these two switch positions you'll see in white was making 2.9 PSI in pink was making 6 PSI here at 47 mph and then it ramped up so this is allowing you to control torque and not take the tires off so you can find a switch position that works for you based on different power levels different tires different Surface Prep settings but the most important thing here is that we work alongside the smooth boost we use can information to give you maximum power out the back but ramp it in so you can use it in the front
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