need help with my by pass and/or bov

JapCarForum Car Manufacturers Lexus/Toyota need help with my by pass and/or bov

need help with my by pass and/or bov

need help with my by pass and/or bov

lexusdaydreaming
Member

196

12-09-2022, 08:54 AM

#1

hi guys, so i have noticed for last wee while when i put my foot down my bypass was releasing air. boost on gauge was dropping. it happens around 4k rpm. i had a bov installed also just to be sure if either failed i had a backup already there. i removed the vacuum line from bypass valve and just kept the bov installed and it releasing air just at idel and when i put floor down it just releasing air non stop and no boost what so ever. i then remove bov altogether and just keep bypass valve on and the same it releasing boost/air at 4k rpm.
i am lost. its all taped to the vacuum like and then returned back to car. i have i missed something?

lexusdaydreaming

12-09-2022, 08:54 AM #1

hi guys, so i have noticed for last wee while when i put my foot down my bypass was releasing air. boost on gauge was dropping. it happens around 4k rpm. i had a bov installed also just to be sure if either failed i had a backup already there. i removed the vacuum line from bypass valve and just kept the bov installed and it releasing air just at idel and when i put floor down it just releasing air non stop and no boost what so ever. i then remove bov altogether and just keep bypass valve on and the same it releasing boost/air at 4k rpm.
i am lost. its all taped to the vacuum like and then returned back to car. i have i missed something?

Sparkystav
Administrator

14,683

12-09-2022, 12:39 PM

#2

Is this on a turbo or supercharged engine?

So the bypass is air operated?

Edited 24-10-2015, 10:14 PM by Sparkystav.

[Image: LexuS-Copy.jpg]

Read my thread here: The Evolution of my Turbo Lexus from NA-Supercharged-Twin Turbo-Massive Single
Please leave your comments.

OutlawJapClub Admin Team

Sparkystav

12-09-2022, 12:39 PM #2

Is this on a turbo or supercharged engine?

So the bypass is air operated?

[Image: LexuS-Copy.jpg]

Read my thread here: The Evolution of my Turbo Lexus from NA-Supercharged-Twin Turbo-Massive Single
Please leave your comments.

OutlawJapClub Admin Team

lexusdaydreaming
Member

196

12-09-2022, 12:57 PM

#3

Supercharged engine.

lexusdaydreaming

12-09-2022, 12:57 PM #3

Supercharged engine.

lexusdaydreaming
Member

196

12-09-2022, 12:58 PM

#4

Yea operated with the vacuum line.

lexusdaydreaming

12-09-2022, 12:58 PM #4

Yea operated with the vacuum line.

lexusdaydreaming
Member

196

12-09-2022, 01:00 PM

#5

Normally when driving the throttle is down the bypass is shut. And when the throttle is off the bypass opens. But at around 4k rpm it seems the throttle is down but the bypass starts opening.

lexusdaydreaming

12-09-2022, 01:00 PM #5

Normally when driving the throttle is down the bypass is shut. And when the throttle is off the bypass opens. But at around 4k rpm it seems the throttle is down but the bypass starts opening.

Sparkystav
Administrator

14,683

12-09-2022, 11:08 PM

#6

Hmm, It could be that at higher revs there's too much flow past it and its forcing it open.

Wonder if pat has the same problem with his?

[Image: LexuS-Copy.jpg]

Read my thread here: The Evolution of my Turbo Lexus from NA-Supercharged-Twin Turbo-Massive Single
Please leave your comments.

OutlawJapClub Admin Team

Sparkystav

12-09-2022, 11:08 PM #6

Hmm, It could be that at higher revs there's too much flow past it and its forcing it open.

Wonder if pat has the same problem with his?

[Image: LexuS-Copy.jpg]

Read my thread here: The Evolution of my Turbo Lexus from NA-Supercharged-Twin Turbo-Massive Single
Please leave your comments.

OutlawJapClub Admin Team

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