I'm racing a friend tonight. First i raced a friends bike (2004 Yamaha YZF R6) W/ exaust. The bike is rated at 10.7 @ 125 bone stock. I put approx 2 cars on him and kept pulling. Also raced my friends sentra SE-R. His car went 11.7 @ 118. Put a really bad hurtin on him. 10+++ cars lol. Then... Yes, as you read in the title, my waste gate desides to fall off. While im in 4th gear the power just stopped. I let off and tried to get on it again, but no power and no boost. I heard it dangling on the pavment. Drove slowly to my house and it finally fell off......What this means is time for the TTI race kit headers to be purchased before summer But i still don't understand how the gate fell off. It ripped the welds right off the pipe.

 

That is easy some one did some shity welds on the gate place to the exhaust pipe. I always inspect welds that i did not do just for this reason.

 

Damn that is a hell of a deal.

 

well if you needed an excuse to upgrade i guess that is one!
good luck with the new stuff lemme know if i can help at all.

 

That would sure suck!

Especially in the heat of a big race weekend or something!

 

I have the same kit and I had a cracked weld on the log and also a small hole in the weld where the BOV is mounted. Luckily APE fixed the log for me and I fixed the hole at the BOV myself. I guess I should check my wastegate flanges in the spring. I am doing a small upgrade to a Tial 38 so I might be re-doing some plumbing anyway. Im thinking of going to atmosphere off the gate to keep the turbulence down after the turbo. Some people say it helps spool a bit, only one way to find out? Michigan has no inspection.

 

i think it would make more sense if you hit something and ripped it off instead of it just blowing off??

 

Well the road was perfectly flat. And it broke clean off at the weld. I hope they give me a deal on those TTI race headers.

 

I blew a similar emissions pipe off my Kooks headers.
They weren't very helpful with a replacement and I paid to fix it locally.

 

it won't help it spool, when the turbo is spooling the wastgate is closed. Eliminating the back pressure behind the wastegate will help with boost creep.

mark

 

the way stainless is welded has alot to do with it. especially welding around in a circle. If you do weld something round (circle), your supposed to stitch weld it and allow it to cool some as your doing it. if you just weld it right around, stainless has a tendency to crack, not a big crack, might not be noticable, but in time, weight on it and vibrations it will shear right off. Im a pipe welder and repair alot of large stainless coolers that do the same thing. either use thicker material, or incorporate some kind of gusset or brace.