I happened to find these adjustable front upper camber arms:
http://www.isrperformance.com/isr-pe...-infiniti-g35/

I couldnīt find any information about these anywhere on the internet. They seem to be a fairly new product.

The design seems to be really good, very similar to SPL V4.
Camber and caster are both adjustable without disassembling anything. Just loosen the lock nut, turn the ball joint adjuster and tighten the lock nut.
This also has much more accurate camber adjustment, since you donīt have to rotate the ball joint in half or full turn increments, basically the angles adjustment is step-less.
This is a big advantage versus other designs which change camber at 0.3 - 0.4 degree increments. Also you can easily fine tune both camber and caster to be identical on both sides of the vehicle.

The structure is tubular steel with welds, opposed to the machined aluminium of the SPL parts. Weight is therefore higher.

The spindle mounting ball joint is mounted rigidly, which eliminates a failure point, which is found in the Kinetix or Z1 arms for example. Nobody wishes their suspension to collapse during driving, I have seen pictures of failed arms from both of those parts.

One question that remains is the quality of the materials, especially the ball joints. Chassis mounting point ball joints donīt look like cheap cast material fro the pictures, but they are marketing pictures.
As they are monoball design, some NVH is transmitted to the chassis. This is acceptable, as the only camber&caster adjustable FUCA with bushings is made by SPC, which costs about twice as much as the ISR.
The Z1 arms race version is also caster adjustable for a bit lower cost, but that one is much less precise and takes much more work to adjust. That one has monoball mounting as well.

Unfortunately spare ball joints don't seem to be available, unlike for competing products such as the SPL, Kinetix & Z1 arms.

One quality concern is the use of bended tubes on both side of the arm. Without a CNC bending machine, these kind of pipes are hard to manufacture to accurate dimensions.
Thankfully the great adjusting mechanism can compensate for any manufacturing irregularities in this design.

I have read about poor quality and weld in ISR products, mainly in the single exhaust for the 350Z. Which is why I wanted to post this and listen to other opinions on these.
I am tempted to order these. They cost about 300$ with a discount at the moment, versus the SPL V4 at 750$. Surely they canīt be 2,5x worse?

Picture:

 

If i had the money right now i would take advantage of the 20% discount this weekend and order the spl. Don't normally see this discount except on black friday weekend. With some of the flaws that come from ISR formerly known as ISIS, would not buy a suspension part that could result in further damage if broken. Just my 2 cents though if you want to try them and give a full timeline updated review.

 

Yeah, you are right on that one. But as you said: "if I had the money".
I have about 5000$ worth of parts I need to order, including coilovers, front camber arms, sway bar end links, Clutch-type LSD, differential bearings, differential cooling cover, output shaft, Nismo clutch disc, oil pan spacer and a pile of spare parts.

And as I live in the EU, shipping is expensive and I need to pay 24% of tax on top of everything.
So that 300$ ISR part becomes 350€ and 750$ SPL part becomes almost 900€. That is a 550€ difference, which is massive.

I could order the Cusco camber arms from Japan for a similar price as the ISR, but that design is inferior with the 5-step camber adjustment and no caster adjustment.
The design is proven though, and the bushings mean less NVH as the car is a daily with regular trackday & timeattack driving.


The car is at stock ride height at the moment with whiteline ARB's. I plan to lower it by max of 1/2" with new coilovers, most likely Tein Mono Sports. Front bushings are whiteline, exept for the FUCA which is OEM. Tires will be Yokohama AD08R.

To pass modifying inspection, I need an alignment paper that states the car is within OEM specs after lowering. I think this will be close even with the OEM arms, as the camber is now at -1.0. After lowering by 10mm it would still likely be within -1.3deg.
But I might need a part that has some positive camber adjustment if I'm over the spec limit. After getting the alignment paper for OEM spec, I will most likely align front camber to -1.5 ~ -2 deg on both sides, caster would be nice to have at 8.9 deg which is the OEM spec upper limit.

 

I wish i could remember the name of a local to you company that makes suspension parts. Has been a couple years since i had seen them. Didn't look at them long due to tariffs and honestly like the design of spl better even though very expensive. If i can stumble across the company again i will post, could save you alot buying local.

 

Now that you mentioned it, I briefly searched some European webshops.
Maybe you are remembering these Driftworks arms:
https://www.driftworks.com/driftwork...0z-z33-03.html

These seem to have similar adjustment mechanism, and the price is a bargain.
I might actually go with these, thank you very much.

 

Yes that is the company i was thinking about.