BOV options? - Alfa Romeo Giulia Forum
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post #1 of 6 (permalink) Old 04-15-2019, 05:36 PM Thread Starter
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BOV options?

Just wondering since it has two turbos, is there an option to swap out the BOV (Blow off valve), to something that is a bit more louder? I know back in the day, guys would swap out some crazy sounding BOV's on their Supras and GTR's and would literally scare people as they heard them coming hammering down through the gears!

'17 QV
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post #2 of 6 (permalink) Old 04-15-2019, 07:03 PM
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Pretty sure our QV uses diverter valves and not blow-off valves.
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post #3 of 6 (permalink) Old 04-15-2019, 08:39 PM
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if you change the blow off valve that is open to the air, you need to retune your computer , if not your engine Rpm will stall.
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post #4 of 6 (permalink) Old 04-15-2019, 09:11 PM Thread Starter
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Sounds like i need to research this turbo setup more as I've never heard of "diverter valves".... Thanks guys for the heads up.

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post #5 of 6 (permalink) Old 04-15-2019, 09:16 PM
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Originally Posted by Buba1 View Post
Sounds like i need to research this turbo setup more as I've never heard of "diverter valves".... Thanks guys for the heads up.
Diverter valves vent back into the low pressure side of the intake system. Blow off valves vent to the atmosphere (hence the extra noise). The issue is if a car is designed/tuned for diverter valves and you switch to blow off valve, you have metered air exiting the system and it's not accounted for. This can cause the car to run rich or other problems if not tuned for.
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post #6 of 6 (permalink) Old 04-17-2019, 11:47 PM
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Originally Posted by beaups View Post
Diverter valves vent back into the low pressure side of the intake system. Blow off valves vent to the atmosphere (hence the extra noise). The issue is if a car is designed/tuned for diverter valves and you switch to blow off valve, you have metered air exiting the system and it's not accounted for. This can cause the car to run rich or other problems if not tuned for.
Also the Diverter valves are used to keep boost, so turbo lag is reduced system works best with these. Sucks we don't get the extra sound.
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