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  • Ultimate IRS rear suspension components release - part one - lower arms / coilovers
  • Post author
    Joel Grannas

Ultimate IRS rear suspension components release - part one - lower arms / coilovers

As a continuing effort to develop more and more bad ass products for the MKIV Supra, I give you the GR Ultimate IRS Coilover setup.

So you might have seen the pictures of my Ultimate IRS subframe, which is a strengthened chromoly tubular unit designed to be a direct bolt-in factory replacement. However, the subframe is after all, just a subframe. There is a lot more than just the foundation to make the total package work.

The main player in this setup is the custom lower control arms, which not only allow adjustability, but also the use of a common through-bolt style drag shock. To make it all work, an upper hat is also included that bolts to the shock tower area. This setup is 100% chromoly, for not only incredible strength but also lightweight.

This control arm and upper hat mount setup allows for use of a double adjustable shock, which allows you to not only set compression, but also rebound, which is really important in setting up an IRS suspension. Rebound allows you to control how quickly the car comes back up from the squatting position, this allows you to keep the car planted rather than bouncing up and down when the car unloads, such as in a 6-speed car during shifts!

Not only does the GR Ultimate control arm setup allow for the use of a common affordable shock options, but it also allows for camber adjustment with the lower control arms single adjustability.

On top of that, it includes mount tabs for travel sensors so you can fine tune your suspension on launches, going around/down the track, as well as on hard cornering for the road course guys!

The lower control arms / upper hats / and multiple coilover options are available as a kit with or without the shocks/struts.

So, today is just the beginning... The launch of the Ultimate IRS Coilovers, with more components coming soon, including the actual subframe itself! I am working on the pricing for that next, so stay tuned. I anticipate having the pricing setup for those sometime in January 2018. Until then, please be patient as I am working as quickly as I can.

Above is a picture of the travel sensor installed.

Interested in the suspension setup or have questions? Get a hold of me.

  • Post author
    Joel Grannas