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Anti Squat Kit

ianp
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ianp Enthusiast

ianp

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Hi All

Finally getting back to work on the R32 this weekend and had a quick question about the GKTech anti squat kit (https://au.gktech.com/products/s13-180sx-r32-subframe-anti-squat-reduction-weld-in-kit?_pos=39&_fid=eb6b5077e&_ss=c)

So, this straightens out the rear LCA and increases the roll centre by 20MM which is great BUT I also have MFR roll centre adjusters (https://www.rhdjapan.com/moonface-super-lap-rc-joint-roll-center-adjuster-bnr32-ps13-rps13.html) which gives a +15MM lift.

My question is whether they can/should be used together or if its going to massively effect the geometry? In my mind, I can't see that they work together but was hoping for some feedback on someone who has done this before deciding which to use or if both?

 

Thanks :)

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GTSBoy Grand Master

GTSBoy

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Well, it's actually probably worse than you think. I think you have to (minimally) install GKTech's spherical bush replacements to the lower arm's inner ends, because you absolutely cannot subject the original (or poly) bushes to that much misalignment. The better option being to replace the whole lower arm with GKTech's unit. This brings sphericals to the lower inners either way you do it.

And are you aware that the kit is weld in and you have to take the subframe out of the car to get it fitted? It's a fair bit of work. These issues both drive my ongoing dithering about doing this to my car, for the last couple of years.

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ianp Enthusiast

ianp

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29 minutes ago, GTSBoy said:

Well, it's actually probably worse than you think. I think you have to (minimally) install GKTech's spherical bush replacements to the lower arm's inner ends, because you absolutely cannot subject the original (or poly) bushes to that much misalignment. The better option being to replace the whole lower arm with GKTech's unit. This brings sphericals to the lower inners either way you do it.

And are you aware that the kit is weld in and you have to take the subframe out of the car to get it fitted? It's a fair bit of work. These issues both drive my ongoing dithering about doing this to my car, for the last couple of years.

Ah, that does change things then as I have Nismo LCA's with Superpro poly bushes fitted. Frame is out of the car as I still need to weld in the reinforcement plates before painting my frame and fitting the new bushes.

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robbo_rb180 Grand Master

robbo_rb180

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What are you doing with the car? street car or race car?
People get hung up on the squat of the s/r chassis rears. There is positives to the squat if a car is setup and driven correctly for it (correct ride height, spring rate, alignment, damper valving). Generally just lengthen the rear traction arm by 5-10mm and that will help the squat and bump steer too.
You are also correct with the roll centre too. This too also needs to be adjustable if you start messing with suspension geometry.
 
Having done quiet a bit of testing on race cars this year in regards to rear squat, I've seen some big positives from it in regards to drive off corners and traction. 

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ianp Enthusiast

ianp

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Its likely to be 70% road 30% track usage, track usage will increase if anything.

Decided not to fit it as I cant be arsed changing the bushes on my LCAs again 🤣

I did get the below back from GKTech though so they should work together :) 

 

The anti-squat kit and roll center adjusters work independently since they change the rear lower control arm's angle in different ways.
  • The anti-squat kit adjusts the angle from front to back, which impacts anti-squat values.
  • Roll center adjusters change the angle side to side, mainly to correct geometry on cars that are significantly lowered.
They might affect each other a tiny bit, but overall, you can think of them as separate.
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