juffer

Im having strange boost problems. I have a lot of preload on my arm (about 9mm) and im running 12psi of boost. I turned up the boost using a bleed valve a quater of a turn and it's hitting 21 psi. I thought the bleed valve was at fault so i removed this and run standard actuator pressure. Its now 10 psi.

I have nothing inbertween 12 and 21 psi.

Stu @ M Developments

iTrader: (12)

9mm of preload is far too much. Get an actuator more capable of what your trying to do.

juffer

It was only loaded with the 9mm to get the 12psi. I understand it should be something around 6mm preload with a aftermarket I/C. The -31 isn't that old but i guess even newish stuff can fail.

xr2wishy

iTrader: (2)

depends on the make of the -31 actuator.
genuine garrett should be good for a couple of years, collins and the like tend to have weaker springs that lose their ability over time.
call to matt lewis will get you a new one though.

Marc D

is your amal valve plugged in and working?

juffer

sorry i didnt explain. Im running megasquirt EFI. Im going to fit another garrett -31 and see if its that.

Karlos G

iTrader: (4)

You have answered your own question... Bleed valve is faulty or just extremely sensitive!
Without it you will only make actuator preload pressure, as you are.
I dont know why Stu suggested another actuator as it is doing exactly what it's supposed to if it's holding 10psi without problems?! lol