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997 Turbo / GT2 2006–2012 Turbo discussion on the 997 model Porsche 911 Twin Turbo.
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low boost in 997.1 turbo

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Old Mar 19, 2020 | 04:32 AM
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  #16  
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Originally Posted by Emre@Esmotor
Hello,

If you have 0,7 bar from each turbo, it doesnt mean you should get 1,4-1,5 bar. Pressure doesnt increase like that. Its not qty, its pressure.
So total boost is 0,7 in your case.

Whats the detail of your full setup? Turbos, plumbing, boost controller info etc.. There are lots of details.
hi ..thanks..car is 3.8ltr..1000cc injectors,mac n75 boost control solenoid,hybrid kkk 26/27 turbochargers with tial external,ams performance intercooler,custom y-pipe 60mm..custom exhaust,no cell etc
 
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Old Mar 19, 2020 | 05:21 AM
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Have you changed you N75 valve? Which springs are installed on the wastegates?

Looks like you have a VTG signal converter unit to control the boost, that can be also faulty...
 
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Old Mar 19, 2020 | 05:36 AM
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Originally Posted by Emre@Esmotor
Have you changed you N75 valve? Which springs are installed on the wastegates?

Looks like you have a VTG signal converter unit to control the boost, that can be also faulty...
i changed stock n75 with MAC..i measurement wastegate and show 0.6bar..so i believe springs is for 0.6bar
 
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Old Mar 19, 2020 | 05:42 AM
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I would suggest replacing N75 with a newer N75 (instead of MAC).
If it doesnt solve it, either you have a problem in your wastegate lines (leaking, damaged etc...) or your boost control box is faulty.

Hard to diagnose without changing some parts. There are lots of variables on your setup.
 
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Old Mar 19, 2020 | 05:58 AM
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Originally Posted by Emre@Esmotor
I would suggest replacing N75 with a newer N75 (instead of MAC).
If it doesnt solve it, either you have a problem in your wastegate lines (leaking, damaged etc...) or your boost control box is faulty.

Hard to diagnose without changing some parts. There are lots of variables on your setup.
ok..i will try with another n75 and i will let you know
 
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