Project DBA R35 GT-R: Putting the Suspension All Together With SPL Parts and Whiteline 

by Mike Kojima


Now we are in the home stretch for upgrading our GT-R's underpinnings with our quest to improve its on-track staying power and to reduce its propensity to understeer. In previous editions, we did the suspension basics and upgraded the brakes on the car. Now it was time to finish this part of our project off.

One of the keys to getting a car to handle well is to get it to use all of the tires' contact patches under cornering load. The GT-R has an issue to where the front camber and caster is not adjustable from the factory, and being able to add more negative camber in the front is critical to reducing understeer.

Being able to increase negative camber and keep the caster in check as well is also critical. Really wide tires do not like an excessive amount of positive caster, so being able to adjust the caster is important as well.

We will also be adding more adjustment capability in the rear suspension and getting rid of squishy rubber, so read on to see what we did!

Read more about Project GT-R!


To bring adjustability to Godzilla's suspension, we applied the whole gamut of adjustable suspension links made by SPL Parts. SPL's links are very high quality and have features that make them easy to use. We will get more into this in a bit.

Perhaps the most critical part in the quest for GT-R handling improvement is SPL Part's PRO adjustable upper control arm. This gives you full adjustability of both camber and caster, and it eliminates rubber bushings in the upper arm.

The SPL Parts upper arm is CNC-machined from 6061 T-6 billet aluminum. The arm was designed using FEA (Finite Element Analysis) to assure that the arm would be both stronger and lighter than stock. The arm itself is hard anodized for durability and corrosion resistance.


The SPL Parts PRO upper arm uses super high-quality, teflon lined FK spherical bearings for the rod ends and the ball joints. We have found that FK bearings are the most durable of the high-end rod bearings that we have used in racing. 

The bearings ride in 4130 chromoly adjusters that support the entire bearing shank to reduce the chances that they can bend. The adjusters allow the camber and caster to be adjusted quickly without removing the bearing from the chassis side greatly speeding set up time. A 6061 lock ring keeps the adjuster from moving once they are set.

The adjusters are electroless nickel plated for extreme corrosion resistance and smooth operation.  All hardware on the arm is lightweight and corrosion resistant titanium.


You can see the elaborate FEA guided CNC milling done to reduce the arms weight without sacrificing strength.

You can also see the sturdy FK ball joint with its high misalignment spacers that allow a lot of safe articulation over the suspension's stroke. We should have weighed the arm and gotten an exact comparison to the stock part, but by hefting, it was considerably lighter. 



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Monday, February 05, 2018 11:09 AM
What's he weight difference between the stock and the spl front upper arm?
Mike Kojima
Mike Kojimalink
Monday, February 05, 2018 11:13 AM
Unfortunately, I didn't weigh it, I don't know what I was thinking. It is quite a bit lighter.
Monday, February 05, 2018 2:03 PM
just asking cause you guys made similar claims about some of the parts on Project C7 Corvette which weren't exactly true...
Mike Kojima
Mike Kojimalink
Monday, February 05, 2018 2:32 PM
We got the wrong info from a PR agency. Its different for a project I am entirely responsible for where I selected the parts and know all about them. That was an unusual case.
Tuesday, February 06, 2018 7:47 AM
Take the damn thing to the track! I want quantification!

Are you not going to run out of brake again once you up the power?
Mike Kojima
Mike Kojimalink
Tuesday, February 06, 2018 9:32 AM
possibly but you can't fit in much bigger!
Tuesday, February 06, 2018 3:03 PM
How bad is the NVH? Is it still streetable or painfully loud?
Mike Kojima
Mike Kojimalink
Tuesday, February 06, 2018 3:22 PM
The NVH hardly any different from a noise/harshness standpoint and the overall ride is a lot smoother. I think a lot of this is the stock run flat tires have really stiff sidewalls and are heavy which adds to the unsprung weight.
Thursday, February 08, 2018 5:12 PM
Car looks beautiful. It must be a thrill to drive!
Monday, February 12, 2018 12:00 PM
After seeing those SPL parts, I knew they'd be pricey. Just 2 upper control arms alone are $1250.
Mike Kojima
Mike Kojimalink
Monday, February 12, 2018 1:17 PM
so would you put cheap shitty parts on a GT-R?
Monday, February 12, 2018 5:54 PM
I wasn't trying to be negative. I'd probably go same route with GT-R. Wish my track car had aftermarket support instead of trying to get machinists to make one-off parts.
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