Proper blow off valve preload, turbo car

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May 9, 2008 | 07:23 AM

homebuilt

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Joined: Apr 2008

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From: Grand Blanc, Michigan

Proper blow off valve preload, turbo car

Does anyone know how to properly determine the proper blow off valve preload setting?

I can notice boost escaping though my blow off valve when I lightly accelerate. I have been progressively tightening the preload setting. I only had about one turn left on the bolt for the last adjustment. It might be bleeding some part throttle boost off but it is now chattering when I let off.

Any tips or recommendations would be appreciated.

May 9, 2008 | 11:05 AM

VUSS383

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Joined: Sep 2006

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If you have chatter back it off . It is normal to have some boost seepage at part throttle . You want your BOV to open as early as possible when backing off so you dont slow the spool of the turbo !