Puck hole

[HellOnWheels]

I have a 3" THDP, what is the correct puck hole size at the turbine housing?


TIA
HOW

 

[salvageV6]

First you need to see if the hole is centered over the puck, if not I wouldn't go much over 1".

If so leave about 1/16" to 3/32" which is better if possible.

Needs to cover the hole perfectly especially if not centered.

THDP's rarely are centered from what I've seen, and I have one.

I think my housing is a 1 1/16" hole.

 

[2QUIK6]

Depends also on your turbo. My stocker worked fine with a 15/16" hole.
But with the 6131E, I had to bore it out to 1 1/4" before it would control boost down to 15#.
The THDP puck is 1 3/8" in size.

 

[GNVAIR]

What size turbo is this being used on.
For a stock turbo I would never go above .900"
A friend and I experiemented with this a long time ago playing around with different sizes on a stock turbo. We had it opened as far as 1.25" and the problem you run into is having to make the actuator rod ridiculously short to make any usable boost.

 

[turbo2nr]

1" hole works great for TE61, PT54, GT67, etc. I have never tried a 70 turbo, maybe that needs a little bigger hole.