GT28RS wastegate stuck

[Roguewolf240]

So my waste gate on my disco potato will not open the whole way. When i give full throttle it goes up to 22 lbs with rediculous response. I initially thout\ght it was the wastegate acuator, but after playing with the wastegate itself the aforementioned is what I discovered. I'm thinking that it could be the flap is getting stuck on the Greddy o2 housing/the divider plate in the o2 housing, but I haven't taken it apart yet to check. Has anyone had any smilar problems?

[johnnyballs180]

is this a new turbo for you, or a new problem? my first guess is that you have a pressure leak. if there's a leak, then there's nothing to force the wastegate to open.can you move the actuator by hand? it should be a bit tough. where do you have the w/g signal from? is your w/g adjustable? and do you have any kind of boost controller?i'm looking at a pic of the disco potato, and i think that the divider plate would had to have been smacked or bent to block the w/g flap.

i'm just guessing though

[Thoughtful_One]

Check the FSM. They have a method in there to check the wastegate to see if it's functioning properly.

I just checked the RS, and it doesn't have a divided wastegate exit so it really shouldn't be getting stuck.

Make sure that the connection between the wastegate and the pressure source does not have a leak.

Where is your pressure source?

[Roguewolf240]

is this a new turbo for you, or a new problem? my first guess is that you have a pressure leak. if there's a leak, then there's nothing to force the wastegate to open.can you move the actuator by hand? it should be a bit tough. where do you have the w/g signal from? is your w/g adjustable? and do you have any kind of boost controller?i'm looking at a pic of the disco potato, and i think that the divider plate would had to have been smacked or bent to block the w/g flap.

i'm just guessing though

It is a new turbo, but I've had the problem all along. it is the actual flap itself, because when I take off the actuator the flap will open ~30 degrees vs the 90 it should. I do have an adjustable w/g set to as low as will go, but I had a stock one on there I traded out for this one.. Same problem :/

Check the FSM. They have a method in there to check the wastegate to see if it's functioning properly.

I just checked the RS, and it doesn't have a divided wastegate exit so it really shouldn't be getting stuck.

Make sure that the connection between the wastegate and the pressure source does not have a leak.

Where is your pressure source?

I'm not sure what exactly you mean by pressure source, it being a turbo its the exhaust..? It doesn't have any leaks- its on there tight and the elbow has the gasket on there.

And super-duper noob here. FSM?
Modified by Roguewolf240 at 4:05 AM 1/6/2009

[Roguewolf240]

Help, please.. ..

[johnnyballs180]

i think Thoughtful_One means the boost source that the wastegate's getting it's signal from. on your wastegate, there should be a little hose going from it to something... do you have aluminum piping? front mount intercooler? or the stock one? i don't remember 100%, but i think on the plastic pipes that came with the motor, the one going FROM the side-mount intercooler to the throttle body, there's a little nipple that the wastegate's pressure hose is clamped onto.

if you have new piping or a new FMIC, then it kind of depends. on the GReddy ones, you usually have to make your own tap, or you can "T" off that hose to another hose coming from the top right (top right, right?) nipple on the throttle body.

if you're not sure, take a pic and post if for us i'd be happy to brainwash you. lol

FSM is Factory Service Manual; it's kind of hard to find one (especially in english) for the 180/Silvia SR20DEt.. here's a link though:http://www.nicoclub.com/FSM/24...T.pdf

its in japanese, as you'll discover. haha

real quick... are you able to move that flapper by hand? not with the wastegate actuator rod, but the flap itself?

[Roguewolf240]

i think Thoughtful_One means the boost source that the wastegate's getting it's signal from. on your wastegate, there should be a little hose going from it to something... do you have aluminum piping? front mount intercooler? or the stock one? i don't remember 100%, but i think on the plastic pipes that came with the motor, the one going FROM the side-mount intercooler to the throttle body, there's a little nipple that the wastegate's pressure hose is clamped onto.

if you have new piping or a new FMIC, then it kind of depends. on the GReddy ones, you usually have to make your own tap, or you can "T" off that hose to another hose coming from the top right (top right, right?) nipple on the throttle body.

if you're not sure, take a pic and post if for us i'd be happy to brainwash you. lol

FSM is Factory Service Manual; it's kind of hard to find one (especially in english) for the 180/Silvia SR20DEt.. here's a link though:http://www.nicoclub.com/FSM/24...T.pdf

its in japanese, as you'll discover. haha

real quick... are you able to move that flapper by hand? not with the wastegate actuator rod, but the flap itself?

I'm 99% sure the wastegae as far as the npple is hooked up correctly. I know it is hooked up to a "T" that connects it to the BOV and then back to the throttle body.

And I cannot moe the flapper but a fraction of how far I should be able to, 'cause I checked a friend of mine's for refference and its a HUGE differences. I think today I'm going to figure out whether its the wastegate flap getting somehow caught on the Greddy elbow or just messed up somehow... Its no fun watching your boost gauge whenever you accelerate to make sure you don't pass 10 psi

[johnnyballs180]

lol i know the feeling... watching your gauges to make sure you don't eff up.

i don't know what to tell ya.. the wastegate only has to open enough to relieve the extra pressure, but if it's not opening, then something's obviously wrong.

when you say "move the flapper" are you pushing/moving the wastegate actuator rod? or are you touching the flapper thing itself?

it is okay to run the w/g off of the same line as the bov. the bov is simply closed while accelerating because there's no vacuum, only boost/pressure; the w/g will act on that. when you suddenly let off the throttle, the lack of air pressure behind the throttle plate signals the bov to open up, and the w/g does nothing. it's fine like that, but most people would probably recommend running the w/g close to the turbo. i've done it both ways, and the difference is slight.

can you take a pic of your whole turbo? with the w/g and everything? even with the turbo out of the car, the elbow NOT hooked up, and wastegate not connected, you still can't move the flap?

[burntricer]

time to get an external one!