Anyone heard of a blow-off valve or surge valve for the slk230? I have a '99 slk230. I was talking to my friend the other day and he said that a blow-off valve would work on my supercharger too, but its called a surge-valve or bypass valve. He said basically, i could get the blow off sound on my car. Anyone heard anything about this? Where would i mount it if i were to try it? Any help would be great. Thanks
The blow-off or Bypass valve is a device that recirculates the pressurized air from the pressure side of the intake system (after the turbo) to the unpressurized side (before the turbo) during shifts. This keeps a back surge of air during shifts from slowing the turbo and creating more lag when climbing back into boost in the next gears. In other words, the bypass valve helps maintain the turbine speed in the turbo during shifts for less turbo lag when you get back on the throttle, which gives you more performance.
As a supercharger is belt driven, boost is directly correlated to engine speed not exhaust gas pressure with a freewheeling turbine. About the only thing a bypass valve would offer you with a supercharger is a bit of noise. Possible side effects could be a disruption of fuel/air ratio readings and slightly more time to rebuild boost between shifts (read less performance). As a supercharger is not really affected by back-pressure in the intake system caused by closed throttle butterflies during shifts, any residual intake pressure is a small benefit which a blow-off valve would eliminate.
Hope this answers your question although probably not what you wanted to hear.
Sorry but thats not the point i was going for. My friend has an s2000 and is going to get a supercharger for his car. The supercharger kit he is getting comes with a blow-off/bypasss valve. Obviously the kit wouldn't come with it if it didn't help so i brought this subject up to see why no else put one on. i thought it would benefit our cars but i guess it doesn't. I was trying to go for a ricer mod. I'm interested in anything that will help my car perform better. So Brian, i hope that clears it up for you.
For the record, you specifically mentioned getting the sound of the blow-off valove, but nothing about wanting it to "help" or "benefit" your car in some other way.
A lot of the S/C kits for imports (japanese models mainly)
are coming with BOVs.
There is a disadvantage of BOVs venting to the atmosphere. When the pressure is released it is out of the system and therefore must be built-back-up. When it is routed back into the system it will keep some of the pressure. I'm thinking turbo's here. I don't know how that would affect a s/c engine.
Good luck, I'd like to know how it goes. If you do it, write it up for Periokid.
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