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Verkline Complete Upgrade Bundle for BMW Z4 G29 & Toyota A90 Supra - SAVE 13.4%!

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We wanted to develop the suspension set for new Supra A9x from the day it was available, but things really started to happen, when we have watched this video: https://...
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“Recently purchased some diff mounts for my S2, I was very impressed with the quality of the parts, and the fit was perfect. After seeing the quality of those diff mounts etc, I don’t want to use anyone else. For this very reason, I will be placing another order for even more parts next week.”
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Product Description

We wanted to develop the suspension set for new Supra A9x from the day it was available, but things really started to happen, when we have watched this video: https://www.youtube.com/watch?v=XSH3RgGSmF0&t=288s 

Robert from Apex Nürburgring explains the issue with bump steer in the supra and potential problems that it causes in the video above. On the Nürburgring where the cars speed goes up to 270-280 km/h or 175-185 mph, the suspension works in its full travel range. Robert is driving daily the best handling cars in the world like: Ferrari 488 Pista, Porsche GT2RS, McLaren 620R, BMW M3, Toyota GT86 and many others. He knows how to drive and based on this we have developed our set in cooperation with Apex.  

Full set includes (you can click on the name of the item to view full item description):

Rear Lightweight Tubular Subframe Toyota Supra A90 A91

Front Caster Adjustable Control Arms Toyota Supra A90 A91
Front Lower Adjustable Control Arms Toyota Supra A90 A91
Front Bump Steer Adjustable Tie Rod Ends Toyota Supra A90 A91
Front Sway Bar End Links Toyota Supra A90 A91

Rear Adjustable Traction Links Toyota Supra A90 A91
Rear Upper Adjustable Lateral Straight Links Toyota Supra A90 A91
Rear Upper Adjustable Lateral Bent Links Toyota Supra A90 A91
Rear Adjustable Toe Links with lockout kit Toyota Supra A90 A91
Rear Spring Wishbone Bushings with lockout kit Toyota Supra A90 A91
Rear Knuckle Bushings Toyota Supra A90 A91
Rear Sway Bar End Links Toyota Supra A90 A91

Toyota Supra A9X and BMW Z4 G29 were originally designed to provide the best driving experience for normal street use, with a reasonable amount of pushing the car to its limit. That is why it provides from factory tail-happy handling to encourage the driver to have some fun and go a little bit sideways from time to time during everyday use. The issues start to arise when we are starting to look in that car for performance, that tail-happy behavior is starting to give problems with instability of the car.

The main cause for that is the rear end bump steer. In simple words bump steer is telling us how the toe is changing through the suspension travel. In stock Supra bump steer is quite significant. For example during alignment you set your rear toe to 0,11° toe in (black center dot on graph below). This is using stock camber values. Under hard acceleration Your rear end is going down, around 40mm. Then due to bump steer your toe is changing to about 0,3° toe in (blue left dot on graph below). On the other hand under hard braking your rear suspension is going up, again around 40mm. This time it will give you about -0,1° toe out (yellow right dot on graph below).

As you can see, the Supra/Z4 bump steer has a significant impact on the toe during driving. When on alignment you will set your wheels to be toe in, it does not mean that in some circumstances, often difficult to predict you will be driving with rear toe out which is causing the rear end to be very lively. In daily low speeds it is not so bad, but on track usage or highways, it could be the cause of car major instability. 

Another issue with that suspension (5 link especially) is that it has a lot of interdependencies between its properties. It makes it very complicated to modify its setup without deterioration of its kinematics. On the graph below you can find an example of how a change of camber (new alignment setup) by 0,5° can increase bump steer even more (green line – 0,5° increased camber, red line – stock camber setup).

If we would look again at an example of hard braking and rebound of rear suspension by 40mm, we are getting about -0,2° of toe out (pink dot on graph above) instead of -0,1° for stock setup (yellow dot on graph above).

In some cases like going fast over a crest you can have up to 80mm of rebound which in that case would give as much as -0,5° of toe out per wheel. This is -1° of total toe out! Such big change into toe out is giving relatively a huge chance of losing grip and control of the car.

Graphs above are coming from suspension kinematics software, where as an input we use suspension geometry which we gather from 3d scans of a real car. Simulation model was also validated by measurements of bump steer and camber gain on the real car. To do so, we put Supra on leveled jack stands, taken off suspension springs and disconnected the sway bars and then we have the ability to move wheels up and down with a small car jack. For measurements we have used strings, camber gauge tool and steel ruler. Measurements accuracy was about 0,05 degree for toe, 0,2 degree for camber and 1mm for suspension travel. Our measurements have shown good correlation between simulations and reality. 

That is why to prevent such problems we have prepared 3 suspension setup presets (Track, Street, Drag) to provide the best possible performance out of the box, for an every type of driver. These 3 suspension setups developed by us consist of our basic alignment and ride height suggestions, and what is the most important, predefined lengths of every arm, to provide proper kinematics for every designated use of car.

On the graph below you can find a comparison of 2 previous shown bump steer curves (red and green lines) with a curve of our Street setup preset (yellow line).

As you can see, the bump steer curve of our setup provides much reduced bump steer to prevent toe out through all suspension travel. This will give you a stable handling without unpredictable dangerous situations, which were caused by sudden transitions from toe in to toe out.

Summarizing: VERKLINE goal in preparing that 3 setup presets is to improve stock Supra A9x/Z4 G29 and additionally prevent all issues which would occur due to modifying, e.g. camber or ride height to fit the car to a designated use. Our kits will include precise guide lines on how to setup the car using our wishbones and rear subframe. 

Used in:
– Toyota Supra A90
– Toyota Supra A91

Notice: Sold for off road, track and racing applications only. Mounting the bushing may increase some noise, vibration, and harshness (NVH) in the car. We strongly advice to mount the subframe in qualified and experienced workshop

Shipping Information

Same-day shipping for in-stock items when ordered before 2PM. UK delivery via DPD next day and European & Rest of World deliveries are carried out by DHL. 

Returns & Guarantee

2 years warranty on Verkline products. 14-day no quibble returns. See our warranty & returns pages for more information. 

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The products we received look great, can't wait to have them fitted

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frequently asked questions

Is this product in-stock?

We keep 100s of Verkline products in-stock at any one time. If you urgently require a product please message the team prior to ordering to confirm stock availability.

 Can I install this myself?

Installation instructions are provided for almost all products to aid with installation.

What’re the benefits of adjusting the roll centre?

Without getting too deep into it, generally speaking, the higher the roll centre the less the vehicle will roll, the lower the roll centre the more the car will roll. Talking about road cars which are adapted to motorsport, on lowered cars without adjustable roll centres (pretty much all cars without motorsport suspension) they tend to roll more than standard. Raising the roll centre higher repositions the roll centre so that there is less roll.

What’re the benefits of adjusting the camber?

Precisely setting the camber on your car is essential for optimising the tyres contact patch under load which evenly distributes the forces across the tyre. Too much, or too little camber can cause the load to be distributed more on the inner or outer edge which can lead to accelerated wear and poor performance.

What’re the benefits of adjusting the toe?

Precisely setting the toe on your car is essential for optimising multiple aspects which contribute to performance such as corner entry handling, tyre wear (heat) and straight line stability.

What’re the benefits of adjusting the castor?

Precisely setting the castor is very important as this can increase the amount of outside wheel negative camber gain and inside wheel positive camber gain when cornering, further improving the tyre contact patch, whilst running less ‘static’ camber for reduced tyre wear in a straight line.

What’re the benefits of adjusting bump steer?

Bump-steer adjustment can reduce or increase the amount of toe change there is with suspension travel.

What’re the benefits of adjusting camber gain?

Camber-gain adjustment can reduce or increase the amount of camber change there is with suspension travel.

 What’re the benefits of eliminating deflection?

Factory rubber bushes allow for the suspension to move around in ways that allow the wheel alignment to change as they load up, making your car feel less precise and often more unstable. With the Verkline spherical bearings there is no movement which results in a direct and consistent feeling.

What is the warranty on these products?

Verkline products feature a 2 year limited warranty. The warranty information can be found here:
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Verkline Complete Upgrade Bundle for BMW Z4 G29 & Toyota A90 Supra - SAVE 13.4%!

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