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The mkiv Supra Owners Club

Custom MKIV Control Arms


Guest Joshua
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I have been working with Titan Motorsports to develop an all new control arm setup for my car. They have just about completed the R&D on the front and rear upper control arms and have created a rear toe link adjustment similar to the Porsche GT3 style control arm in the rear. The remaining factory control arms all have custom fabricated delrin bushings.

 

The F & R upper control arms use spherical bearings at the end of the wish bones to make the arms longer or shorter which will provide camber (and caster in the front) adjustment, eliminating the use of the OEM eccentric bolts to make adjustment. The really trick part on these is the use of Riley Technologies camber adjusters from the Daytona prototype cars. This enables making camber adjustments in a matter of a few minutes that will NOT affect the toe settings at all. So based on pyrometer readings, a few turns of the adjuster makes the camber adjustment…

 

For anyone who has done their own alignment on a Supra, you well know how long it can take to set the rear camber and toe. The rear uses 2 eccentric bolts to adjust both of these aspects and those bolts have to be torqued to 134 ft/lbs, which means that when you are setting toe to a 32nd of an inch, you have to slightly overshoot your target so that when you torque the bolt it brings it to where you want your setting. In the past this has literally taken me hours of back and forth some times to get it perfect. With the toe link adjuster, once the camber is set from the upper control arm, it is just a matter of turning the barrel adjuster and setting the toe…nice and easy and VERY precise.

 

One of the issues I was having repeatedly was the failure of the front lower control arm bushing on the right side of the car. We think we traced the problem to the excessive heat in that area, as the turbo, wastegate, and downpipe are there and I am using a greddy wastegate the has the small dump tube to the atmosphere right there as well. With the delrin, we don’t expect any more issues.

 

There was (and on the front upper control arms still going) a lot of R & D that Titan did, I know I am leaving out a lot of the finer details, but Wes from Titan can fill in the gaps…

 

Pics…

 

 

 

 

Front Upper Control Arms:

 

 

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Rear Upper Control Arms:

 

 

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Rear Toe Link Adjusters:

 

 

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Work In Progress on the Delrin Busings (before the centers are drilled and metal sleeves added):

 

 

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http://site.titanmotorsports.com/images/JBarnes/10-28-10/Supra-Cage-105.JPG

 

 

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Ikeya do these but their quite expensive.

 

mike_mcevoy has the Ikeya Formula ones on his car, yeah not cheap, they'd be on my wish list if I still had my car.

 

http://www.ikeya-f.co.jp/ja/car_type/images/toyota/t-fua2.gif http://www.ikeya-f.co.jp/ja/car_type/images/toyota/new/t-flow_80_1.jpg http://www.ikeya-f.co.jp/ja/car_type/images/toyota/t-rua8030.gif http://www.ikeya-f.co.jp/ja/car_type/images/toyota/new/t-rlow_80_1.jpg http://www.ikeya-f.co.jp/ja/car_type/images/toyota/new/t-rtoe_1.jpg http://www.ikeya-f.co.jp/ja/car_type/images/toyota/new/t-rtradj_30_1.jpg http://www.ikeya-f.co.jp/ja/car_type/images/toyota/new/t-pbush_30st_1.jpg

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What are you doing with the lower arms as thats where all the camber adjustment is done on a stock wishboned car.

Is there any pitfall to swapping the camber adjustment from below the hub to above it ?

 

How long rose joints will last on a daily driver would be my concern

 

The eccentric bolts for the lower OEM control arms are maxed out to give me the widest track possible. What the camber adjustment at the end of the upper control arm does is make it very easy to adjust camber when I am at the track without affecting toe and or caster. It is also so much easier to just loosen a jam nut and twist a ratchet as opposed to getting under the car to adjust eccentric bolts and then re-torque them. Toyota’s torque spec for those bolts is 166 ft/lbs (226 N m) per the FSM, which is a lot to do on your back when the car in on jack stands

/vbb/images/smilies/bbcode_shock.gif
. There is no pitfall to adjusting it at the new location...just benefits ;).

 

 

The rose joints will have a service life that needs to be planned for replacing...it would depend on mileage and type of driving...

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Will my teeth still stay in with these fitted ? some of our roads you would call farmland-lol

 

Not sure...I have 1300 lbs/in front springs and 950 lb/in rears and:

 

Titan Motorsports solid rear subframe mounts

Titan Motorsports solid differential ear mounts

Titan Motorsports solid differential mounts

Titan Motorsports solid rear subframe mounts

 

My car can hit a bump and make a radio station skip ;)

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Nice work :) What wheel and tyre sizes are you running there on the track?

 

 

CCW Cosair C14 (black) 18X10 front 18X11 rear

CCW Cosair C14 (grey) 18x10 front 18X12 rear

CCW Classics 2 (titanium) 18X10 front 17X11.5 rear

Hoosier R6 285/30/18 front 315/30/18 or 315/35/17 rear

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This is a list of the major mods on my car:

 

Engine\Drivetrain:

GT35R dual ball bearing turbo

Greedy tubular exhaust manifold (Swain Tech White Lightning exhaust coating)

Custom Titan Motorsports intercooler piping

HKS GTR front mount intercooler

Tilton Triple Disc carbon/carbon clutch (9lb flywheel)

TRD differential

AEM standalone engine management

HKS twin power ignition

Titan Motorsports custom fuel system (850cc injectors)

Fluidyne radiator, oil cooler, and power steering cooler

Dual HKS super sequential blow-off Valve

Titan Motorsports dampened crank pulley

Custom downpipe

Greddy racing titanium exhaust

ThermoTec exhaust wrapping on header and downpipe

Boost Logic turbo blanket

 

Brakes:

Castrol SRF brake fluid

 

Front - StopTech 355mm big brakes

StopTech braided stainless steel flexible lines

Hawk DTC70 brake pads

Custom cooling ducts

 

Rear – stock calipers and rotors

Hawk Blue brake pads

TRD braided stainless steel flexible lines

 

Suspension:

Moton 3 way adjustable dampners

Hypercoil springs 1300lb front 950lb rear

TMS adjustable front sway bar (NO rear sway bar)

JIC Magic adjustable front upper control arms

Custom Titan Motorsports solid lower front control arm bushings

Front and rear Cusco shock tower braces

Titan Motorsports solid rear subframe mounts

Titan Motorsports solid differential ear mounts

Titan Motorsports solid differential mounts

Titan Motorsports solid rear subframe mounts

R2 Racing control arm bushings in rear

 

 

CCW Cosair C14 (black) 18X10 front 18X11 rear

CCW Cosair C14 (grey) 18x10 front 18X12 rear

CCW Classics 2 (titanium) 18X10 front 17X11.5 rear

Hoosier R6 285/30/18 front 315/30/18 or 315/35/17 rear

ARP wheel studs

 

Data/Video:

Traqmate Complete

Integrated ChaseCam (in car)

HD Go-Pro Hero (bumper cam)

 

Saftey:

Grand-Am Spec Roll Cage

SPA Techniques 6 point fire suppression system (ATFF)

Schroth Profi II Hans 6 point harnesses

Sparco EVO II seats

Moroso battery box in rear (Odyssey PC680 14lb battery)

 

Misc:

SPA Techniques sequential shift lift

FJO wideband air fuel ratio gage

Greddy boost pressure and EGT gauges

VS-Billet camcorder roll bar mount

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