So, as many of you know, the options for MS6 springs is horrible now that RPM no longer produces springs. FORZDA 1 has run cut OEM springs for 30-40k on his car (which is also tracked), and has only raved about it. After much research and deliberating, I spoke with FORZDA and went for it.
When cutting the coils:
- Cut 1 coil from bottom/skinny portion of the front springs
- Cut 1 coil from the top/larger circumference rear springs
- File the edges to make a smooth surface
- Use primer and black spray paint to seal the exposed steel
- Use only a high-speed machine blade, no heat or hack-saw (I used an angle grinder with a carbine blade-worked very well)
- Move the blade in a back and forth motion while pushing down to give a single-swipe, smooth cut
- Make sure to secure the springs well, I used a clamp, as seen in picture
- Springs get hot, be careful
- Make sure the front springs are snugly seated against the bottom of the shock body. I loosened the spring compressor gradually, adjusted, loosened, ect.. to ensure it seated well
- Make sure to loosen all the control arm bolts when putting the car back on the ground after installing, or it will not settle well on your various bushings. Once on the ground, tighten all bolts to spec. (see the how-to for #'s)
The car rides very well, and I am getting it aligned as we speak, so handling will be fun to test-out this weekend. I have had both H&R and RPM springs, and these are give or take identical in ride quality/drop as the RPM street springs (spring rate may be marginally different, but not noticeable).
After the cut, the front sits at -1 camber (non adjustable), which is perfect, and I am having the rear set at -1 as well, with 0 toe front/rear.
Here are some pictures for fun, and once again, a big thanks to FORZDA for inspiration and his vast knowledge and help with this project.
*NOTE* I am running 42PSI in 225/45/18 touring tires, which makes it appear to sit a little higher
Comparison to RPM Street spring= identical
Discussion on the subject: