Saab GT17 actuator adjustment
Turbo Mini Forums

I had my car set up on the rollers on Saturday and it wouldn't give more than 7psi boost with the bleed valve all the way out.

I have seen various posts on here that says the standard actuator is between 4.5 and 5.5 psi. I think the actuator is set with about 2-4mm of preload.
If I adjust this will it give more and what sort of preload gives what sort of boost pressures?

Thanks

I think I put a foot pump on mine to find out wat it's set at

I have started posting on Instagram also my name on there is turbomk1golf

Nothing is impossible it just costs more and takes longer.

my gt17 actuator gave about 4psi but i could bleed this up to 15 easy
can you measure the strength of the spring? i measured a few a while back iirc its about 1kg draw weight = 1psi boost
( weights are in my build thread somewhere)

Yes i moved to the darkside

Instagram @jdm_brett

Excuse my ignorance but how do you test the draw weight?

stock ( old weak) GT17 - 7.6kg to move it 8.3kg at the end of its travel
stock GT17 - 8.5kg to move, 9.2kg full travel
stock GT20 - 18.5kg to move 22kg full travel

you need some sort of scales that can hook on to the actuator rod ( luggage scales) hold one end and pull the other :)

i only say this because i suspect a weak actuator i had one^^ 4mm pre load is alot and would turn a 4psi actuator into 8 at least i would have thought

Edited by Brett on 23rd Jul, 2013.

Yes i moved to the darkside

Instagram @jdm_brett

Saab tech documentation states ~0.5mm pre load. IE you need to pull the rod another 0.5mm to get it to hook onto the wastegate arm.

This should get you in the region of a standard 4psi wastegate operating pressure.

Make sure you have the bleed valve connected correctly.