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Team America World Time Attack – ARK Design’s BNR32 Skyline GT-R Part 5

  • Mike Kojima

,

A close look at the assembled front suspension.  We are going to gusset the lower arm more around the shock mounting point.  When adding the potential aero loads and the higher spring rates to handle them, we started to become concerned that our design did not have enough safety margin.
The rear suspension is your standard R32/Z32/S13 multilink stuff.  All the bushings have been replaced with bearings and all links have been replaced by adjustable parts from Nagisa Auto.  The subrame itself was extensively reinforced and pickup points made adjustable back in the XS Engineering days. The rear diff is your bread and butter Nissan R200 with an OS Gikken 1.5 way LSD. Once again the OS LSD clutches have been given the WPC treatment. There is a larger capacity euro syle rear diff cover with a greater number of fins. We are going to do something different later but there is no time for this year’s effort.  Next year you will probably see a fabricated lightweight tubular crossmember and a more simple unequal length A arm suspension.
Nagisa Auto links are some of the highest quality bolt in links on the market.  The R32 shares most of the same parts with the S13 and Z32.  We use the same stuff on Dai Yoshihara’s drift car.  We spaced the lower control arm downward to correct the roll center to a degree. If you look closely, you’ll see reinforcement bars and extensive sheet metal boxing that greatly stiffens the subframe. All of the rear subframe hardware will also be changed to the Baller Bolts S13 Titanium rear suspension bolt kit.
The major drawback to the rear suspension geometry is that there is a huge amount of anti squat.  This causes the rear of the car to chatter and wheel hop on corner exit and for the car to violently go into oversteer when the throttle is applied hard.  Previously we had modified the subframe by moving the front LCA mount downward to take out much of the antisquat.  This resulted in a car that could wheelie in drag launches and the exit of slow corners!  For now we are using an off the shelf Whiteline adjustable rear swaybar. Once again you can see tubes added to the subframe in the background.
 Gary in the process of mounting the Plastics 4 Performance lexan rear window.  The quality of the parts has been excellent and they fit extremely well. You can see that there are compound curves in the rear glass that Plastics 4 Performance got perfectly. Eric said that air shipping from the UK was amazingly inexpensive too due to Plastics 4 Performance’s high volume of global air shipping. The lower holes in the rear windshield are to draw air out of the cabin. That’s Tim from Apex Speed hidden behind the laptop laying out the car’s electronics harnesses.
The driver’s compartment is coming together.  The seat is now mounted as per Tarzan’s specs.  The Tilton pedal box is on track and is adjustable fore and aft.  This allows the seat to be fixed in the maximum rearward position.  The driver is set back about a foot from stock.  This makes sense because the driver is one of the heaviest components to the car!

 

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Behind the Smoke 2 – Ep 7 Formula D Asia – Malaysia Video Diary – Dai Yoshihara 2012

  • Aaron LaBeau
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Team America World Time Attack – ARK Design’s BNR32 Skyline GT-R Part 6

  • Mike Kojima
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