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| The suspension features exotic JRZ 3-way adjustable race dampers. High and low speed compression damping can be adjusted independently from the rebound damping. |
Likewise you would expect to find some really exotic suspension underpinnings on the GTR. Well some of the suspension is, 3-way JRZ racing coilover dampers do the chore of suspending the car. The JRZ’s feature independent adjustment of high and low speed compression damping and low speed rebound. Cobb Tuning sway bars are used. The front bar is 38mm vs the stock 34 mm with two adjustment positions 53% and 94% stiffer than stock, the rear bar is 16mm vs the stock 14mm with 3-way adjustability with 40% to 94% greater than stock stiffness.
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The JRZ shocks feature remote reservoirs where the high and low speed compression damping adjusters can be found.
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| The rebound damping adjustment is found at the top of the shock shaft. |
That rounds out the suspension modifications! No fabricated links, no hard bushings, no spherical bearings, no multi adjustable geometry and no relocated pick up points! This is the most stock suspension we have ever seen on a competition vehicle which speaks rounds of the GTR’s engineering!
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| The front Cobb swaybar is a huge 38mm and 2-way adjustable but we could not get a better picture of it because it is buried in the chassis. The rear bar is 3-way adjustable and 16mm in diameter up from the stock 14mm. |
A big car requires big tires. The GTR uses 335/30-18 Toyo RA-1 DOT rubber mounted on 12.5×18″ Jongbloed modular wheels, again nothing that exotic. Likewise you would expect that a big powerful time attack car would be sprouting all manor of wings, canards, barge boards, venturis and other aerodynamic appendages. Not this car, the GTR simply uses an AIT street wide body kit which does have functional aerodynamics. We are proud to say that we had a consulting role in the functionality of this kit and helped AIT ensure that the kit would not have unfunctional rice. The kit is fortified with an additional diffuser in the rear and an APR rear wing but that is the limit of the aerodynamics body mods!
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The airdam on the AIT widebody kit has a fully functional properly dimensioned real deal splitter that really makes quite a bit of downforce. The kick up in the middle of the splitter helps reduce pitch sensitivity. We were consultants to help ensure that this street kit would actually have functional features while still having nice styling.
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The AIT wide body kit complements the lines of the car nicely.
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The AIT wide body kit has a functional fender vent to relieve high pressure in the wheelwell which reduces drag and helps front downforce.
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The rear bumpers has a lot of holes drilled it to relieve pressure build up which reduces drag. It also helps the rear diffuser work better.
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The GTR’s aero kit’s diffuser has these strakes to create vortexes to help the airflow stay attached to the diffuser roof so it is more effective.
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The 3.5″ exhaust blows over the diffuser which helps activate the flow through it which makes it more effective.
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The AIT kit has functional barge boards. This creates extra downforce and help prevent air from curling under the car which helps make the splitter and diffuser work better as well.
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| The APR carbon rear wing also creates downforce and is adjustable for angle of attack. |
Although the GTR has a somewhat high cost of entry, Cobb Motosports, Brian Lock and GOTO racing are proving that it can be reliably and competitively raced with a few carefully selected mods making their GTR what is probably the most stock competitive racer on the Redline circuit. Buy a GTR, race it and drive home, it’s all possible from Cobb.
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