Does Higher Actuator Give Better Top End ?

[FPVF6355]

Hi,

I have a tune to 288RWKW. stock actuator, and the torque kicks in hard around 3000 to 3500 rpm, then dies as the waste gate opens (about 15psi on the tune sheet)

I want to know if a 12PSI actuator will help it hold boost (torque) at higher rpm.

I presume more torque (boost) up high won't be any harder on the motor than lots of torque down in low revs.

or would the result of a higher PSI actuator, increase low down torque too much, and stress the engine ?

Thanks.

[Henz]

Your boost will be falling away with stock actuator, fit a 12 (or whichever your tuner recommends) port the waste gate and get a retune.

[BigAl's04]

A 12psi actuator won't make a difference down low but it will help hold boost all the way to redline.

[FPVF6355]

thanks that's what I was hoping for.

Why does the waste gate need to be bigger ?

Is there potential to over boost ? and a need to safely relieve a higher volume of air quicker,

How critical is the waste gate size to the actuator PSI opening pressure ?

I'd prefer to do the mods myself, then get it tuned. I have my own machine shop, just want to get it right.

[BigAl's04]

Has more to do with exhaust flow than actuator size I think. A more free flowing exhaust will create more spool and overboost if the wastegate isn't ported to compensate.

[FPVF6355]

makes sense bigal

I wander how much harder the turbo will have to spin, to maintain boost at higher rpm,and higher air temp caused by faster turbo speeds.

Time to speak to my tuner.