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Coilover Conversion Kit, BMW E30 Chassis

Spring Kit - This spring kit gives you the option to customize the ride height of your vehicle. After several years of use in racing applications, Ground Control spring kits have been adapted for street use. Most other spring kits offer only one set ride height when installed. The Ground Control system's unique design allows for easy adjustment. Simply lift the corner(s) of the vehicle that you wish to adjust and spin the adjustable spring seat up or down to raise or lower the vehicle*. Ground Control spring kits are also designed to be used with either stock or aftermarket shocks.

Adjusters - All adjusters consist of a threaded sleeve and adjustable spring seat. And are made using high strength 6061-T6 aluminium; anodised for greater durability and appearance. The threads on the adjusters are square cut which locks the adjustable spring seat in place under load. For further precaution, a setscrew in the adjustable spring seat can be used to secure adjustment. Upper spring perches are used to insulate the spring.

NOTES:
- Removal of stock spring seat and welding optional for added tire clearance and range of adjustment.
- *Some applications require the use of a provided wrench.
- Expected ride height change from 0 to 2.2 inches.
- *Kit includes everything you need to convert all four corners using your existing dampers.*

Estimated Volumetric Shipping Weight : 15.00 Kg

 

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Ground Control e30 suspension are for 50-51mm front struts only. If you have 45mm struts (318 and 325e usually) please call to learn about updating your strut housings.

Ref: 2020.76

THIS KIT INCLUDES THE FOLLOWING:

-2 Ground Control / Koni single adjustable strut inserts, bolted into existing housings.
Koni Single Adjustable Front Strut - Custom Valved strut inserts are externally adjustable from underneath the hood, even with the factory strut brace. This strut is prepared for coil over use, and eliminates machining of critical suspension components.

-Ground Control Threaded Sleeves - This system is designed to eliminate stress risers caused by machining notches into the strut housing. Unlike other companies that claim superiority by cutting threads into a critical component of the suspension, Ground Control uses engineering common sense to maximize the strength of the suspension.

-Ground Control Adjustable Spring Perch - A unique design, that uses an allen head bolt to clamp the single threaded perch into the correct position. No secondary pieces are needed to "jam" the threaded perch into position. This method of clamping onto the threads also prevents sand, grit, and water from getting into the threads, which is a common problem with jam nuts.

-2 Koni single adjustable rear shocks
Ground Control / Koni Single Adjustable Rear Shocks - Preadjusted by Ground Control to match your rear spring rates using our shock dyno. The GC custom valved version of this kit is the "top-adjust" version, which adjusts from inside the trunk or under the hood with no tools needed.

-Ground Control Touring Camber / Caster Plates - These plates feature over 23mm of total camber adjustment (16mm negative/7.5mm positive), with the ability to make corrective caster changes to equalize side-to-side caster in the stock position.
Other features include replaceable waterproof German axial load bearings, and urethane bushings for long life, less deflection, and a smooth silent ride on either stock, or 2.5" racing springs.

Our camber plates are also engraved with the Ground Control logo in an arch which can be used to locate the plate in the stock position for easy, repeatable, adjustment from street to track and back.

All components are anodized or zinc plated for corrosion resistance.

We also offer our lifetime guarantee! (Bearings not included)

• A clean sheet design for street cars, not an adapted spherical race plate.
• Waterproof, German-made, axial load steering bearings.
• Allows for up to 23.5mm total camber adjustment. (16mm negative - 7.5mm positive)
• Unique slot design allows for caster correction.
• Revolutionary caster adjustment can be locked or unlocked.
• Urethane center mounts reduce NVH, yet do not flex.
• All components plated or anodized for corrosion resistance.
• Zinc plated mounting bracket for ease of install and adjustment.
• Available for stock diameter, 60mm or 2.5 inch springs

-4 Ground Control springs, made by Eibach (limited selection to match)
Eibach Springs - Any spring rate is available. Eibach springs are made on German machines both in the USA and in Germany, however all Eibach springs have a lifetime guarantee against sagging, rate change, or any manufacturing or material failure. Lifetime guarantee. Compare!

-4 Ground Control bump stops (made in Germany)
Ground Control Bump Stops - We do not just ask you to reuse your stock bump. The stock bump stop is designed for stock suspension we provide a bump stop designed to work with our suspension. These are soft foam, same quality as OE BMW parts, but made to our specs in Germany.

-2 Rear ride height adjusters.
Ground Control Rear Ride Height Adjustment Kit - Billet aluminum threaded adjusters press onto the top of the rear control arm.

-1 Pair rear upper shock mounts (urethane)
Ground Control Rear Shock Mount - Billet aluminum, urethane bushings, pre-assembled. Includes gaskets and reinforcements.

* Suspension is shipped completely assembled and preadjusted *
(You install into your housings, or Ground Control can shorten, reinforce sway bar mount, install perches and powder coat your struts for approximately £240.00 per pair)

Estimated Volumetric Shipping Weight : 18.00 Kg

 

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GROUND CONTROL E30 & M3 Serious Track and Race Single Adjustable

ref: as description

THESE KITS ARE CUSTOM BUILT TO ORDER, PLEASE LET US KNOW THE EXACT MODEL AND USAGE OF YOUR VEHICLE, INCLUDING ANY TRACK USE ETC.

THIS KIT INCLUDES THE FOLLOWING:

-2 KONI single adjustable strut inserts, (double adjust optional) bolted into existing housings

Koni Single Adjustable Front Strut - Custom built and valved exclusively for Ground Control by Koni of Holland, or no charge option of Koni race strut. Strut inserts are externally adjustable from underneath the hood, even with the factory strut brace. This strut is designed for coil over use, and eliminates machining of critical suspension components. This system is designed to eliminate stress risers caused by machining notches into the strut housing. Unlike other companies that claim superiority by cutting threads into a critical component of the suspension, Ground Control uses engineering common sense to maximize the strength of the suspension. Welding is required for this race kit.

Ground Control Adjustable Spring Perch - A unique design, that uses an allen head bolt to clamp the single threaded perch into the correct position. No secondary pieces are needed to "jam" the threaded perch into position. This method of clamping onto the threads also prevents sand, grit, and water from getting into the threads, which is a common problem with jam nuts.

-2 KONI single adjustable (double adjust optional) rear shocks

Koni Single Adjustable Rear Shocks - Preadjusted by Ground Control to match your rear spring rates using our shock dyno. Custom built and valved exclusively for Ground Control by Koni of Holland, which adjusts from inside the trunk or under the hood with no tools needed. Double adjust option available.

1 PAIR front Camber Plates

Ground Control Racing Camber/Caster Plates - More camber adjustment than stock, caster adjustment, aircraft bearings, and engraved with calibrated degrees. Every component is anodized or plated, including fasteners. Adds extra travel to avoid excessive bottoming out, this is a very well engineered product.

Camber and caster are separately adjustable by sliding the mounts, without removing any components from the car. The priority of this design is to allow fast, repeatable alignment changes at the track.

The Ground Control camber plates feature two sets of bearings, a proprietary bearing, made to our specs by Aurora in the USA, which allows for articulation of the shock shaft. This spherical bearing is very understressed, as the Ground Control design does NOT support the weight of the car on the spherical bearing. Instead, the weight of the car is supported by a completely separate articulating needle bearing, which is also manufactured for Ground Control in the USA.

-4 EIBACH ERS springs, any spring rate

Eibach Springs - Any spring rate is available. Eibach springs are made on German machines both in the USA and in Germany, however all Eibach springs have a lifetime guarantee against sagging, rate change, or any manufacturing or material failure. Lifetime guarantee. Compare!

-4 GROUND CONTROL bump stops (made in Germany)

Ground Control Bump Stop - We do not just ask you to reuse your stock bump. The stock bump stop is designed for stock suspension; we provide a bump stop designed to work with our suspension. These are soft foam, same quality as OEM BMW parts, but made to our specs in Germany. Our race bump stops are even different than our street bump stops.

-2 REAR Ride Height Adjusters

Ground Control Rear Ride Height Adjustment Kit - Billet aluminum threaded adjusters bolt on top of the rear control arm. The E46 M has a larger diameter rear axle than the standard Z4, so it is necessary for clearance to not have any portion of the adjuster below the control arm.

-1 PAIR rear upper shock mounts (race with spherical bearing)

Ground Control Rear Shock Mount - Billet aluminum, spherical bearings, pre-assembled. Includes gaskets and reinforcements.

* Suspension is shipped completely assembled and preadjusted *

(You install into your housings, or Ground Control can shorten, add or reinforce M3 style sway bar mount, install perches and powder coat your struts for £200.00 GBP per pair)

Estimated Volumetric Shipping Weight : 25.00 Kg

 

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Ref: E3036

THIS KIT INCLUDES THE FOLLOWING:

- 2 SHORT Koni single adjustable struts in e30 specific Ground Control shortened strut housings
- 2 SHORT Koni single adjustable rear shocks
- 1 Pair front Camber Plates
- 4 Eibach Street or race springs, any spring rate
- 4 Ground Control bump stops (made in Germany)
- 2 Rear Ride Height Adjusters
- 1 Pair rear upper shock mounts (urethane)

* Suspension is shipped completely assembled and pre-adjusted *


Estimated Volumetric Shipping Weight : 25.00 Kg

 

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GROUND CONTROL FULL COILOVER KIT E30 & M3, DOUBLE ADJUSTABLE

Ref: 2020.82

THESE KITS ARE CUSTOM BUILT TO ORDER, PLEASE LET US KNOW THE EXACT MODEL AND USAGE OF YOUR VEHICLE, INCLUDING ANY TRACK USE ETC.

THIS KIT INCLUDES THE FOLLOWING:

-2 GROUND CONTROL / Koni double adjustable strut inserts, bolted into existing housings.

Koni Double Adjustable Front Strut - Custom Valved strut inserts are externally adjustable from underneath the hood, even with the factory strut brace. This strut is prepared for coil over use, and eliminates machining of critical suspension components.

Ground Control Threaded Sleeves - This system is designed to eliminate stress risers caused by machining notches into the strut housing. Unlike other companies that claim superiority by cutting threads into a critical component of the suspension, Ground Control uses engineering common sense to maximize the strength of the suspension.

Ground Control Adjustable Spring Perch - A unique design, that uses an allen head bolt to clamp the single threaded perch into the correct position. No secondary pieces are needed to jam the threaded perch into position. This method of clamping onto the threads also prevents sand, grit, and water from getting into the threads, which is a common problem with jam nuts.

-2 KONI double adjustable rear shocks

Ground Control / Koni Double Adjustable Rear Shocks - Preadjusted by Ground Control to match your rear spring rates using our shock dyno. The GC custom valved version of this kit is the top-adjust version, which adjusts from inside the trunk or under the hood with no tools needed.


-1 PAIR front Camber Plates.

Ground Control Racing Camber / Caster Plates - More camber adjustment than stock, caster adjustment, aircraft bearings, and engraved with calibrated degrees. Every component is anodized or plated, including fasteners. Adds extra travel to avoid excessive bottoming out, this is a very well engineered product.
Camber and caster are separately adjustable by sliding the mounts, without removing any components from the car. The priority of this design is to allow fast, repeatable alignment changes at the track.
The Ground Control camber plates feature two sets of bearings, a proprietary bearing, made to our specs by Aurora in the USA, which allows for articulation of the shock shaft. This spherical bearing is very understressed, as the Ground Control design does NOT support the weight of the car on the spherical bearing. Instead, the weight of the car is supported by a completely separate articulating needle bearing, which is also manufactured for Ground Control in the USA.

-4 EIBACH ERS Springs, or Ground Control springs by Eibach. (your choice)

Eibach Springs - Any spring rate is available. Eibach springs are made on German machines both in the USA and in Germany, however all Eibach springs have a lifetime guarantee against sagging, rate change, or any manufacturing or material failure. Lifetime guarantee. Compare!

-4 GROUND CONTROL bump stops (made in Germany)

Ground Control Bump Stops - We do not just ask you to reuse your stock bump. The stock bump stop is designed for stock suspension we provide a bump stop designed to work with our suspension. These are soft foam, same quality as OE BMW parts, but made to our specs in Germany.

-2 REAR ride height adjusters and upper perches.

Ground Control Rear Ride Height Adjustment Kit - Billet aluminum threaded adjusters press onto the top of the rear control arm.

-1 PAIR rear upper shock mounts (urethane)

Ground Control Rear Shock Mount - Billet aluminum, urethane bushings, pre-assembled. Includes gaskets and reinforcements.

* Suspension is shipped completely assembled and preadjusted * (You install into your housings, or Ground Control can shorten, reinforce sway bar mount, install perches and powder coat your struts for£200.00 GBP per pair)

OPTIONS AVAILABLE :
Spring Perches - Please select from the following choices:
A = If you plan to leave the front perch alone. (limited adjustment)
OR
B = If you would like to cut the perch off and weld on a new smaller steel perch.

Front Strut Housings- Please select from the following choices:
1 = If you would like to keep standard length housings.
OR
2 = If you would like instructions on how to shorten your strut housings.
OR
3 = If you would like to send us your strut housings to weld.

Estimated Volumetric Shipping Weight : 25.00 Kg

 

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GROUND CONTROL STREET COILOVER KIT E30 & M3 Standard Length Struts

Ref: 2020.71


THESE KITS ARE CUSTOM BUILT TO ORDER, PLEASE LET US KNOW THE EXACT MODEL AND USAGE OF YOUR VEHICLE, INCLUDING ANY TRACK USE ETC.

*This Ground Control e30 suspension are for 50-51mm front struts only. If you have 45mm struts (318 and 325e usually) please call to discuss options about updating your strut housings.

THIS KIT INCLUDES THE FOLLOWING:

-2 KONI single adjustable front struts. (Standard Length Housings).

Koni Single Adjustable Front Strut - Koni strut inserts are bolted into your existing strut housings, and are externally adjustable from underneath the hood, even with the factory strut brace. Ground Control Threaded Sleeves This system is designed to eliminate stress risers caused by machining notches into the strut housing. Unlike other companies that claim superiority by cutting threads into a critical component of the suspension, Ground Control uses engineering common sense to maximize the strength of the suspension.

Ground Control Adjustable Spring Perch - A unique design, that uses an allen head bolt to clamp the single threaded perch into the correct position. No secondary pieces are needed to "jam" the threaded perch into position. This method of clamping onto the threads also prevents sand, grit, and water from getting into the threads, which is a common problem with jam nuts.

2 KONI single adjustable rear shocks

Koni Single Adjustable Rear Shocks - Preadjusted by Ground Control to match your rear spring rates using our shock dyno. Your choice of two adjustable versions: The standard version, which needs tools and a jack to adjust, and the "top-adjust" version, which adjusts from inside the trunk with no tools needed. The "top-adjust" option adds $100 to the kit price.

-4 GROUND CONTROL springs, manufactured to our specs by Eibach, with a street spring rate.

Eibach Springs - Street spring rates is available. Eibach springs are made on German machines both in the USA and in Germany, however all Eibach springs have a lifetime guarantee against sagging, rate change, or any manufacturing or material failure. Lifetime guarantee. Compare!

-2 REAR Ride Height Adjusters

Ground Control Rear Ride Height Adjustment Kit - Billet aluminum threaded adjusters bolt on top of the rear control arm.

*Suspension is shipped completely assembled and preadjusted*

Estimated Volumetric Shipping Weight : 25.00 Kg