uncontrollable boost....wastegate?

[MelloEclipse]

So I had a thread a while back about how after I installed my air intake, that my boost shot up to 23 psi.

I took my manual boost controller off and just ran a hose from the j-pipe to the wastegate nipple, and still boosted at 23 psi. no kinks, no leaks, so is my wastegate fried?

 

[1g_tsi_awd]

My guess (as stated in the PM) would be that the WG actuator is stuck.

 

[TiradoCC]

test your wastegate....just unbolt it from the turbo and hook up an air compressor to the nipple....should move in and out.

 

[Mr Peepers]

test your wastegate....just unbolt it from the turbo and hook up an air compressor to the nipple....should move in and out.

I second ct78155 but make sure not to use more psi than you have to or you may risk actually ruining it. On a properly working WGA you should only need ~10-15psi max. I'm sure people have run 30psi on their car with a stock WGA, but the actuator itself never actually saw that because of the bleeder hole in the MBC and the pressure on the ball and spring.

Try testing it with the arm attached and unattached. Also try moving the flapper by hand through its full motion and feel for any catches. The lever should have little to no resistance and just fall back into place.

 

[polen]

agreed ^

 

[MelloEclipse]

i'll have to test it tomorrow...would a boost spike up to 25ish cause it to malfuction like that? I don't know about wastegates so I'm fixing to start researching them, thanks for the help.

 

[Mr Peepers]

If you are spiking to ~25 psi with an e3 16g the last thing I would be worried about is the WGA if you are still running the stock fuel system/upgraded with nothing to tune with.

 

[MelloEclipse]

the 25 psi spike only happened once...and then 23 psi only happened twice because i wasn't paying attention. other than than i don't let it go above 15-16...

is there something else i should be worried about?

 

[95EclipseGST]

I just installed a brand new 6 bolt engine with EVO3 turbo and my boost shoots way up to 20 psi with barely any foot on gas. This is a brand new turbo, how could anything be stuck? I disonnected the wastegate tube and plugged it with a rubber nipple, then tried it with it unplugged completely and still have uncontrollable spiking boost when normally accelerating. I thought it was my MBC, but i took that out of the picture completely.
1)So the first step i should try, is to unhook the wastegete arm?

2)How hard is this to do and what parts do i need to take off the car to get to it to unhook it?

3)Can i pull on that WG arm with vice grips, back and forth "without" messing something up on this new turbo? Would that help anything?

4) My cars boost shot up to 20psi on accident while not even going very fast or very high rpm's. Is it possible i messed something up in the engine, even though it still seems to run fine, minus the boost prob?

 

[arabeclipse]

I didn't want to start a new thread, but when i bought my s16g, the wastegate actuator was leaking air really badly and the rod wouldn't move. So, i bout a new actuator meant for MHI turbos from Internal Wastegate 10 PSI MITS Style TD05 16G Actuator Mitsubishi and it says that it's good for 10psi.

I put it on and hooked a line from the J pipe to the wastegate. Spool became wicked quick than ever before and will go all the way to 30 if I dont take my foot off the gas. What's the problem here?

 

[AngelOfPassion]

I think that may be a knockoff. A 16g wastegate actuator shaft should look more like a hockey stick at the end. Like this:

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This would be the one you need: 16g wastegate actuator