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Old 01-16-2022, 11:19 AM   #1
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Losing all boost on no lift upshift

The car since the pulley and tune loses boost on the no lift upshift, loses all of it. It didn't used to do that.



The car kinda pauses for a split second after the shift, it shows it dropping boost on the datalog. If you shift it a little early around 5800 it seems to not do it as bad, at 6000 or a little over it does it every time. I did do the boost bypass mod a loooong time ago.


Bad boost bypass valve? The car has 109,000 miles. Time to change it?

Last edited by FASTFATBOY; 01-16-2022 at 08:05 PM.
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Old 01-16-2022, 11:52 PM   #2
KaBoom1701
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Get with your tuner and have him data log it. Should be able to see what going on.
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Old 01-17-2022, 12:01 AM   #3
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Old 01-17-2022, 07:11 AM   #4
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Quote:
Originally Posted by KaBoom1701 View Post
Get with your tuner and have him data log it. Should be able to see what going on.



I am datalogging with HP Tuners, i can feel it on the pass and confirm it on the log.
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Old 01-17-2022, 11:32 AM   #5
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I assume no codes?
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Old 01-17-2022, 07:26 PM   #6
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I assume no codes?



No codes
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Old 01-17-2022, 07:55 PM   #7
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What's the throttle plate doing on HPT when you lose boost?
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Old 01-17-2022, 09:48 PM   #8
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What's the throttle plate doing on HPT when you lose boost?



I lose all boost then it comes right back. The throttle is at 99% and stays there, when I shift the blade closes some for Tq management I think
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