Wastegate question for the pros

[mohawkmike82]

OK guys Ive been thinking about it for a few days and this may have already been discussed or tried. I Tried searching with no luck. Ill keep it short and sweet.

Would there be any benefit to "porting" or "boring" the wastegate? I mean as far as relieving drive pressure. Or would it simply then require more spring pressure from the TM to build boost?

Any thoughts?

 

[NVW]

I would leave it alone, it just has to crack open to drop boost.

 

[Turbine Doc]

I'm not sure you have the function of system down pat, WG is not opened to make more boost, WG is normally closed and then opened per the PCM's program to reduce drive pressure making less boost from the compressoe, LEO is correct just a little opening of the WG lessens drive to the turbine and make dramatic drop in developed boost charge of the compressor.

The backpressure that is negative with the GM turbo is flow restrictions of the design itself of the turbo, it is an adequate turbo design for the intended use /performance as delivered by GM.

A number of us have opted for a "better turbo" for upgraded use, look at different signatures to see who's running what turbo, I'm partial to the one I run, look for threads on ATT multiple discussions on it & other turbos (mostly Holset variants) chosen.

 

[mohawkmike82]

Got it. I guess in my head I was thinking the waste gate was more than cracked while producing boost.

 

[Monarkman]

GJF also has a Garrett set up that looks very nice.