[Peter]

Hi, I think my first turbo is turning off to fast. Do you know from which to which rpm should work 1st turbo and 2nd?

 

[Guest]

the first turbo doesn't turn off, second turbo comes on with the first turbo at around 10psi

the *sequence* is

turbo 1 --> turbo 1 + turbo 2

 

[Peter]

Than why my first turbo is turning off around 3.000 rpm - I am sure 100%, I can feel that and hear as well.

What could be broken?

I've noticed that: if I accelerate from 1000 rpm up, at 2.300 rpm 1st turbo kick in and around 3.000 rpm it goes off but if I stop accelerate for second and start again (3200 rpm) it will kick again and turns off after few seconds and again if I stop accelerate for one second (3200 rpm) and start again it will kick. If I do not stop accelerate it would not kick.

Please help

 

[Nivek]

There is a pressure drop between the transition from #1 to #2. This drop may feel like #1 is shutting off, but what is happening is once a certain rpm is reached a valve opens up to allow #2 to come on, this valve when opening and filling the #2 turbo with air takes some pressure off of #1 which causes boost to drop and then kick starts #2..this where you get that big kick in the ass!

 

[Peter]

Is it around 3.000 rpm? and last from 3.000 to 4.000 rpm when 2nd kick in?

 

[Nivek]

My car is in TTC right now. If I remember right, the valve opens at around 3.5k RPM and the #2 comes to full boost around 4.2k RPM