Hi, i check my Tial wastegate and i don't understand this.
The wastegate size is 38mm but the in and out hole is about 35mm.
This is normal or this wastegate is not 38mm but 35mm?

 

My tial 46mm has a flange that's only 40mm. The valve is 46mm though. Always felt like that was kind of silly.

 

It's how the poppet valve operates.
Yeah, you're right - it is sort of a con.
This is why the Turbosmart(?) brand of wastegates started to advertise their orifice size versus the valve size.  Their 45mm wastegate functions more like a 50mm wastegate by other manufacturers.
http://www.turbosmart.com.au/wastegates.htm


-Ted

 

Thanks all.....

 

The Tial 35 and 38mm gates look much different, you can tell what you have by just looking at it. I assure you the valve I sold you is 38mm NOT 35mm.

 

Hi RX7 TURBO2.
Thanks for this 38mm wastegate, i just check why the 38mm wastegate have not 38mm hole, and if is same with all brand (not for blast you)
Because last year i run with Audi wastegate 31mm hole
and is too small.
I thing i put (pop off valve) this year with this wastegate.
Or i put 2 38mm wastegate.

 

Cool. As was mentioned different manufactures measure things, differently.