I ordered a tial wastegate off of ebay (which Im officially fininshed with) and it doesnt hold the boost at all. I had a cheap wastegat which did the same thing. I have a s300 and its set to cut off at 10lbs and my wastegate has a 6lb spring and it overshoots and cuts the motor off every time i try to get into it. I've tried vacuum on both the lines to the wastegate. WTF

 

you should NOT be putting any vacuum source to the top of the wastegate unless you have a EBC.

its probably a knock off. does it have tial cast into the body?

are you even sure you have a 6lb spring? can you push the valve open with 1 finger?

 

It does have tial cast into side and on top. The spring did feel a little tuff though it definatly takes more than one finger. I do have a ebc but its not hooked up now so I think its probably a higher pd spring. Its easier to push than the ebay wastegate which was suppose to be 8 lbs but that did the same thing too sooo. It came in a garrett box and had 5.8lbs wrote on the side of the box.

 

Take the top off of it and look at the spring to know what it is for sure. Also, are you using a fire ring between the manifold and wastegate? Using the side port only right and leaving the top port open? Good vac source?

 

wth is a fire ring. Is that the ring that goes on the bottom of the wg when you install it? If so then yes I installed it but tommarow I'll be doing some work on the car and take the wg off and check it out. I wasnt running and vacuum on it but I tried both and neither would hold boost. Vacuum is t'd from the fpr. Next time I get out I'll run the vacuum to the bottom/side outlet of the wastegate, RIght?

 

of course the wastegate isnt going to work without a vacuum source hooked to the side port.

if its spiking boost you might have a wastegate placement problem? it shouldnt be boosting more then the spring rating if you have a vacuum source ot the side of the WG. your vacuum source is in fact AFTER the throttle body right? not on a port on the TB?

try hooking a vacuum line to the side of the Wg and directly to the manifold and report back.

 

and yes the fire ring is the little ring on the bottom AKA valve seat. if you didnt have that installed though, it wouldnt make any boost.

 

You need to look at how the WG works - pressurized air pushes the spring (and valve) up at that certain spring pressure, and only does so with the bottom port. Since it did it to both WG's, I'd almost guess you have a crappy manifold - what type of manifold do you have? Also what turbo is it? If its a huge turbo, a small WG at low psi is more prone to creeping.

 

Cheap ebay turbo kit u should be able to see it in my avatar. Im working on replaceing turbo componets but money is an issue (duh or never wouldve went to ebay). I ordered the wastegate from himni racing. I will try running it straight from the manifold and let you guys know. I thought that bov and wastegates worked both on vacuum but mainly pressure (through the exhaust manifold on the wg and chargepipes for the bov). Ive ran the bov with no vacuum and it still blows fine. Thanks for all the help you guys are the greatest.
Oh and the diaphram in the old wg was fuc ed.

 

Ok I ran it straight to the manifold and it does much better but still cuts off after two gears of pulling hard to 7k. So what next an eagle vacuum manifold. Its suppose to keep boost at 6 and its still cutting off a 10 any more suggestions.

 

take it apart find out what color the spring is check it with color code on tial web site.What size gate is it?

 

will do tommarow thanks for the responses

 

well thats your problem. ssauto manifold with the shitty wastegate placement. its not gonna hold 6psi in the higher gears with that. either get a new manifold or deal with running 10psi minimum

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CoreyR &raquo;</TD></TR><TR><TD CLASS="quote">well thats your problem. ssauto manifold with the shitty wastegate placement. its not gonna hold 6psi in the higher gears with that. either get a new manifold or deal with running 10psi minimum</TD></TR></TABLE>

Yep, or just cut the flange off and port the wastegate hole and reweld the pipe for the wastegate back on. I had to do that a few times back in the day to a couple of those manifolds.

 

What do you mean port the wategate hole? Make it bigger and shorter? The manifold really isnt worth fuc in with cause its a piece of **** and already has a small hole in one of the welds. Kinda sounds like a spaceship lol.

 

LOL. he means cut off the WG flange and pipe, open the actual hole in the collector bigger and reweld the wastegate flange back on, but dont do it at an upward angle like it already is make it come out at as much of a downward angle as possible (without hitting the compressor housing of course)

 

You could also check for creep in another way, assuming it really is this bad. Take the spring out of the WG, put it back together, and keep the pressure line hooked to the lower port. It will go to 0psi at WOT, and towards the higher rpms, if the manifold is the reason for boost creep, you will start seeing a couple psi. If its 1-2psi, its not bad, if its 6-8psi or more, its the manifold.

 

this should help determine if it's fake or not
http://www.tialsport.com/realvsfake.html

 

Yeah I got one of both. I took the pvc line out of the manifold and ran that to the wg and its holding pretty well at 7-9 lb but I think the crappy manifold has something to do with it to. I just freaked out when I read about fake tials.