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+--- Thread: Twin turbo - Big Backpressure? (/showthread.php?tid=6863)
Twin turbo - Big Backpressure? - deviance - 11-03-2015
Hello!
Can it be problem is the small turbo is just too small and causing too big backpressure?
It's about GT20wg size.
Thanks!
RE: Twin turbo - Big Backpressure? - whipplem104 - 11-03-2015
Well since no one else is going to. Yes.
RE: Twin turbo - Big Backpressure? - barrote - 11-04-2015
what twin turbo app u have ? in a 603 right?
RE: Twin turbo - Big Backpressure? - deviance - 11-04-2015
606
Small turbo like gt20 big turbo is k27
RE: Twin turbo - Big Backpressure? - AlanMcR - 11-04-2015
That would be a sequential turbo, no?
RE: Twin turbo - Big Backpressure? - barrote - 11-04-2015
hey man, u are walking the wrong road, have two gt20 one for each trio of cylinders, choose the ones that fire 120ยบ appart.
0 /120/240, the other 60/180/300~
good luck then ...
RE: Twin turbo - Big Backpressure? - deviance - 11-04-2015
This will be a big fail
RE: Twin turbo - Big Backpressure? - Hario' - 11-04-2015
(11-03-2015, 07:24 PM)deviance Hello!
Can it be problem is the small turbo is just too small and causing too big backpressure?
It's about GT20wg size.
Thanks!
If you mean compound then you need a big enough wg to bypass the small turbo as it becomes a gas restriction at high rpms
RE: Twin turbo - Big Backpressure? - deviance - 11-04-2015
I have like this so i can turn off the exhaust gas from small turbo.
pic
RE: Twin turbo - Big Backpressure? - Tito - 11-05-2015
I was going to do the same thing. How did you route the exhaust side? The butterfly valve you showed should block off the big turbo and not the small one, so when the big turbo is needed the valve opens and lets the big turbo breathe.
RE: Twin turbo - Big Backpressure? - Hario' - 11-06-2015
(11-05-2015, 04:00 PM)Tito I was going to do the same thing. How did you route the exhaust side? The butterfly valve you showed should block off the big turbo and not the small one, so when the big turbo is needed the valve opens and lets the big turbo breathe.
Problem is when that valve opens all drive pressure will fall to zero and boost will fall with it and you get a big step in the power curve and big puff o smoke.
I couldn't really work out how to control staging like that mechanically ie lots of actuators and flappy things (the onus being on not using electronics).
Perhaps the small turbo wastegate feeds the big turbo to start it spooling before flappy opens?
RE: Twin turbo - Big Backpressure? - deviance - 11-06-2015
We are not using electronic now and wastegate and i tested today it going really good!