2nd Generation Specific 1986-1992 Discussion

Bov's

Old 03-07-2004, 05:51 PM
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So, the question I have is, do stock cars with Turbo's have Bov's? My understanding is that they dont, thats what the wastgate is for. Bov's are just better performance wise for engine decceleration and such. I am going to be buying an 87 TII and was wondering if I bought an aftermarket Bov, if I need to make a hole for it in the intake and such. Thanks a bunch.
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Old 03-07-2004, 05:53 PM
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They do indeed have a BOV
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Old 03-07-2004, 05:55 PM
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They have bov's, they're just recirculated into the TID so theres no woosh noise.



And a bov and wastegate are two completely different things. A wastgate diverts exhaust gases away from the turbo to limit boost.
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Old 03-07-2004, 06:37 PM
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Exactly what Lee says.. wastegates divert the exhaust gases to control and limit boost levels and blow off valve or relief valve relieves air in the intercooler pipes when thethe throttle plates slam shut therefore it blow offs instead of returning in the compressor.. hence but causing compressor surge..
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Old 03-08-2004, 08:35 AM
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Mazda calls it the "Air Bypass Valve" and its considered part of the "Deceleration Control System". It sits close to the passenger-side fender, in a hose that connects the pressure side of the turbo with the TID, and has a vacuum line going to it.
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Old 03-08-2004, 11:41 PM
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Here is a shot of the stock S4 (left) and S5 (right) Bypass valves.
Attached Thumbnails Bov's-bov2.jpg  
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Old 03-09-2004, 11:43 PM
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Sweet, thanks guys
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