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Grannas Racing

Ultimate IRS - Double Adjustable Coilover Rear Suspension with adjustable rear lower control arms for Supra/SC300

$ 889.00

Grannas Racing

Ultimate IRS - Double Adjustable Coilover Rear Suspension with adjustable rear lower control arms for Supra/SC300

$ 889.00

$ 889.00

No longer limited to Bolt on suspension kits like Tein, HKS Drag, etc.... This suspension was designed along with my ultimate IRS subframe to allow the use of any common through-bolt shock, commonly used in all forms of racing. This will bolt into your stock subframe as well, the Ultimate subframe is NOT required to run this setup! 

This full 4130 chromoly construction 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!

This kit includes a upper hat that bolts into the factory shock tower and an adjustable lower control arm.

This bolts into the factory mounting points and used the factory spindle. No modifications are required.

There are three coilover options currently. The base kit uses Strange brand double adjustables. The middle tier kit uses double adjustable Penske based coilovers setup specific for the Supra by Precision Racing Suspension. The top of the line coilover is again a Penske based strut but with an additional canister which allows for finer tuning of the suspension. 

Current Shock Options:

  • "PRS" Penske based strut which are custom valved for the Supra chassis and they are double adjustable (no canister) w/ 250 lb strange springs
  • "PRS" Penske based strut which are custom valved for the Supra chassis and they are double adjustable with fine tuning canister adjustment (same setup I run on my 6-speed car) w/ 250 lb strange springs

A lot of people ask how would these compare to HKS Drag coilovers... well, the difference is night and day. You are talking about 20 year old technology based on a factory mounted strut compared to current racing technology. All of the coilovers I offer are double adjustable. HKS Drags are only single adjustable. The double adjustability (rebound control) allows you to control the speed at which the shock "rebounds" from a squat. That is key when it comes to IRS and keeping the car planted going down the track. This is especially helpful in a manual transmission car, where the car will unload and come out of squat on every shift. The double adjustability allows you to tune the suspension to keep the car planted on shifts.