Strengthening and Improving the Geometry of the S13 Subframe With GKTech and ZSM Custom

The welding on the upper control arm bracket looks great.

The traction rod pivot bracket is much stronger with the gusseting in place.

The toe rod mount is now much stronger and flex-free.

Here is the other gusset on the other side of the toe rod mount.

These 4 heavy cast steel weights serve as mass dampers.  They are welded to the cross member. Nissan added these to reduce NVH.  Since this is a track car, we don’t care about minor NVH issues so they had to go.


  1. Thats some awesome attention to detail. I can only see myself crashing the car on its maiden voyage with all these nice parts. Love the photo documentation as well.

    1. You guys always do it right. Kinda of rare. If I ever need or one of my friends needed some work done or just good advice I would reccommed your outfit 100% Mike. Thanks.

  2. i’ve installed quite a few of the s13 and s14 gktech weld in reinforcement kits (haven’t done the s13 roll center correction one yet) and i HIGHLY recommend this for ALL 240 owners. if you’re dropping the subframe to install solid bushings, its a great time to have the whole thing sandblasted and the gktech kit welded in.

    Personally, i mig weld them, but if someone wanted to pay for the additional time to tig weld (most of the time is spent getting super tight fitment for all parts prior to welding) i don’t see any downside to it in this application.

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