Ok so I know where the lines go from the boost solenoid, However the 257 does not have a compressor port of which I can put the line for boost pressure.

Here is stock boost solenoid.


This is the 257


I had thought that the ports on the left were one of them, but upon further review those ports are not drilled through. Rather tehy look like mounting holes.



^larger hole



^Threaded hole on compressor side.



Smallest hole
^^^

Any advice as to what I should do with it? I want the stock boost solenoid for Km034 to tune to boost instead of a manual boost controller.

 

You have to drill and tap them.

Take the compressor housing off to do it.

You may want to just have a shop do this......

 

The one with two holes is for a turbo speed sensor.

 

the hole with the the smaller hole beside it is the compressor speed sensor hole, leave that one, drill and tap the other one. or just run a line from you cp to the solenoid, u don't actually have to go off the turbo, it will just be slightly more accurate.

 

Hey thanks guys, Figured it out.

This hole is allready threaded for the boost source. Turns out since soo many different ways to do this. (i.e. No speed sensor/ manual boost controller which doesnt need the boost source) they drill to the end of the housing, allowing the option to drill a small hole through it and using the allready made threads threading in a fitting. So Im going to the parts store to get the correct fitting for the threads and drill bit today.

this is the fitting for the boost source

 

I wonder if u could just put grease on the bit so u wouldn't have to take off compressor housing, that should keep any shavings from falling in. but idk, risky.

 

Taking the housing off isn't hard at all. I did it all in like 30 minutes remove and install.