Help: Volvo S40 2.0t (lpt) 2002 wastegate mod

Hi all,

How much one turn of wastegate actuator affects into boost level? How do
you make your MBC (manual boost controller) and which hoses I should
connect it. There is red, yellow and green hose coming to somekind of
boostvalve?

I am about to increace boost level a little bit, but I am not sure that
which method is the best one. Does stock 2.0t low pressure turbo boosts
about 0.6 bar? I am thinking to increase boost level about to 0.8-0.9
bar (stock +0.2-0.3 bar), can somebody estimate how much is the power
gain(kW / Nm) ?

Thanks for answers,

T Jantunen

 

hi all can anyone help me, I broke the cable to unlock the engine
compartment of my 1989 780 volvo. the car has a battery cut off switch and i
can't drive it. I tried to pull the cable with a vise gripe and that made
it worse. Anyone have an idea or some experience with a cablr release. thank
you gary v.

 

The maximum boost is set by the computer varying the duty cycle of a
solenoid valve that bleeds pressure from the wastegate actuator.
Turning up the boost this way will just cause the computer to release
more pressure from the wastegate actuator, and will give you no benefit,
as far as max boost goes. However this modification will maybe affect
how quickly the first bit of boost comes on, depending on how loose the
wastegate actuator is set. To turn up the boost you either need to
remove it from computer control (manual boost controller) or reprogram
the computer.