gt2860rs .64 rear housing overboost gen3 3s-gte, Fixed overboost (atleast so far) Options

[delusionz]

Any suggestions? I want to run 16psi, the included actuator should be 12psi but its spiking to 20psi alot faster than i can let off the throttle

am going to pull the downpipe off and test the actuator with a pump, maybe change from 5mm hose to 8mm hose? (Mr Garry's actuator nipple seems a little bigger than Mr CT's)

but has anyone seen this themselves and seen an effective fix short of going external?

if my actuator and door are operating as normal, will porting the gate do the trick? any special tricks?

This post has been edited by delusionz: May 24, 2011 - 12:18 AM

[delusionz]

Fixed overboost.

The wastegate hole was bored out an extra 3mm and the path on the inside was grinded out to direct more flow towards the wastegate instead of straight down to the turbine.

Also the swivelling bracket was modified to bring the actuator arm closer to the pivot point so that the door opens wider. The standard actuator arm only moves so far, in effect the wastegate door opens about 45 degrees instead of 90 deg

Now it seems to hang on to 0.9bar instead of shooting upwards of 1.4bar. I've lost alot of low end response and some midrange punch but I think this can be remedied with a better EBC.

I haven't revved out to 7000 yet, So I'll update this later.

If problems persist, the next step will be fitting either a 2.25" or 2.5" restrictor before the rear muffler