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Actuator Problem

ashr32

By ashr32,
in Engines & Forced Induction

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ashr32 Rising Star

ashr32

Posted
Posted

hey guys,

after putting the whole exhaust side of the rb20det engine back together there is a rattle coming from the actuator. its a rb20 one on a r33 turbo. the sound is coming from the inside of the dump like the flap has 1mm of play in it. if i pull the actuator pipe towards the front of the car it goes away so not a big issue. also when i rev the car up and let the revs decrease i get a puff puff puff sound from the exhaust like its blocked or the flap isnt closing properly.

anyone had this? any ideas as to a fix. the bolts which connect the actuator to the turbo are tight and dont have any adjustment to pull it tighter.

thanks guys

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EFI Performance Enthusiast

EFI Performance

Posted
Posted

No more adjustment to screw down???

You will need to chop it down and modify it to fit on, it needs to be one hole away from the gate flap, you extend the diaphragm for it to hold the gate closed.

ashr32 Rising Star

ashr32

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No more adjustment to screw down???

You will need to chop it down and modify it to fit on, it needs to be one hole away from the gate flap, you extend the diaphragm for it to hold the gate closed.

no what i mean is, there are 2 screw holes for the actuator to attach to the turbo. those holes are set so it just bolts on. this setup was working fine before it was stripped down and nothing has changed.

there just seems to be some play from where the rod attaches to the flap. the rod is held on by a washer which has a split in it. (dont know the name) like i said its only about 1-2mm of play but thats enough it cause the high pitch sound.

by the way its not the turbo, the wheel spins fine and isn't obstructed by anything

ashr32 Rising Star

ashr32

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Undo those 2 bolts holding the actuator bracket, then push down and towards the front of the car while tightening the 2 bolts up. That will fix it.

yeah thats what i thought. if its all the same parts it must just be push back a bit. ill test today and post later.

Slide Grand Master

Slide

Posted
Posted

If the actuator arm is still loose, take off the actuator and bend the arm so that it pushes the gate closed harder.

The actuator length and turbo length is different between the RB25 and RB20 turbo's from the mounting points which is giving you the problem.

Simply put it in a vice or if you can hold it steady so that the diaphragm is not damaged when you bend the arm.

It will fix it, it wont damage anything done carefully, and it will also give you better boost response.

The best solution though is a HKS adjustable actuator, you will not find a better solution even if you are running an EBC.

Have done it hundreds of times on as many turbo's and cars.

:D

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