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SBR 50trim Internal gate problem.

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gtsiawd96

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Discussion starter · #1 ·
I bought a used sbr g50 internal gate. Has about 1,000 miles on it. I have a tubular o2 dump. I put the turbo on started it up. Exhaust is getting past the flapper pretty badly. No boost till 4500-5000rpm. I adjusted the adjustable rod as tight as i could made no difference. I finally pulled the turbo off. Took my air hose blew air at the flapper and air is definitly making its way past the flapper. the flapper appears to be the right size. The flapper arm does have very minimal play in it. It also welded on. I have no clue how to fix this problem. Can anyone lend me some information on ways to go about fixing this ASAP.

Thanks.
JJ
 
#2 ·
Weld the flapper shut and get yourself a external gate. Just my opinion. A 50 trim is pushing it with an internal wastegate. Not saying that it cant, or hasnt been done, but people have more luck running an external gate on a bigger turbo.
 
#8 ·
I run a pt 50 trim internal gate, and have had no problem to 24 psi so far. I also have a tubular o2 housing. What kinda of o2 housing do you have, if its a stock 1g it could be choking, keeping the wastegate open. Whats welded? the flapper to the lever or what, if so I agree with pirate, without a doubt. You dont need external gate for a 50 trim just as long as you set up the internal gate properly. But externals are a better route if you have the money to spare.
 
Discussion starter · #9 ·
The actuator rod is connected to the lever(outside). The lever has a tac weld holding it onto the arm that runs into the turbine housing that holds the flapper witch does spin freely . I have a tubular o2 housing. I am positive that is not the problem. The arm has a good amount of endplay.. the best i can describe it. It won't let the flapper sit flush. I think there was a problem when it was put together. This should not be happening....
 
#10 ·
I have an SBR-M50 that used to be internally gated. It held boost fine with a 2.5" exhaust and small intake parts. After putting on some bigger items I couldn't hold jack :). Just remember to port out that wastegate passage once you go externally gated, b/c I had to pull my turbo again realizing even with the external gate it won't hold boost well with that small of a passage :/.
 
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