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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars

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Boost cut?

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Old Apr 21st, 2019, 21:53   #11
mocambique-amazone
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T5 sweep
Both will do (hose diameter between manual boost control and waste gate, different actuator)

With wrong (cheap) hardware there will be a boost peak. This boost peak will be registrated from the ECU by the AMM

A China boisterous gauge will not be good in quantity, neither in anything else.
It will registrate a vacuum or a boost.
Never trust the number. 0.6 at the gauge will be between 0.3 and 1.0 bar in reality
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Old Apr 21st, 2019, 21:56   #12
Laird Scooby
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Quote:
Originally Posted by mocambique-amazone View Post
T5 sweep
Both will do (hose diameter between manual boost control and waste gate, different actuator)
A larger hose will allow fluctuations in the boost pressure that wouldn't normally be noticed (intake pulses cause them) to create problems so smaller bore hoses tend to damp this out.
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Old Apr 23rd, 2019, 13:43   #13
TonyS9
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Just to be clear there is no boost cut on a 98 940, there are no pressure sensors, there is an airflow limit.

On my race-ish 360 97 B230FT it happens at about 16psi + 3000rpm using a TD04-13C and no other mods (wasted spark and cone filter).

As already mentioned the FK actuator is not much good above 7 or 8psi.

Last edited by TonyS9; Apr 23rd, 2019 at 13:48.
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