Sneak Peek: Daigo Saito’s Achilles Tire SC430


The cage is minimalistic lacking the triangulation seen in many of the top US cars.  This is an area where a lot of US built cars are triangulated.
The pedal system is very simple as it is just using modified stock Toyota components.  This is very different from most US drift car that use racing pedal boxes with dual brake master cylinders and balance bars to adjust brake proportioning fully.  Daigo's car uses a stock master cylinder and power brake booster.  The lightweight clutch pedal operates a Spec twin disc clutch using metal discs and a lightweight flywheel.
Daigo can adjust his brake bias to some degree with this hydraulic proportioning valve.  Unlike dual master cylinders and a balance bar where you have full control of the brake bias, the valve can only adjust the slope of the rear brake pressure curve after the knee point.
Daigo uses a driver controlled drift brake operated by this lever attached to a Willwood master cylinder.  The shifter goes to an exotic sequentially shifted Holinger dog type, close ratio, six speed transmission from a GT300 JGTC car.  The close ratio six speed reduces the need for a quick change rear end like many US drift cars run. US thinking is to use a strong and light 4 speed NASCAR style gearbox with fine tuning of the final drive ratio via a quick change rear end.
The rear brakes and the drift brake are Wilwood Dynapro 4 piston calipers.  We were looking at the offset in the rear brake rotor hat and are pretty surprised that the cars track was widened so far by spacers.  This puts a lot of strain on suspension components and wheel bearings.  A wave type, solid sprint car rotor is used.  On a sprint car this helps clear dirt from the brakes but we suspect that Daigo uses these rotors for lighter weight and looks.
The front brakes use a 6 piston Wilwood Dynapro caliper with a solid wave rotor.  When using the stock master cylinder, careful attention has to be spent on caliper fluid capacity and the ratio of caliper piston sizes.  It is interesting that this works out Ok.

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