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ProjectDC5.com
A blog about the conversion of our Honda Integra DC5 to a circuit racing monster: ProjectDC5.com

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You are here: Showoff Imports.nl » Suspension » Full Suspension Kits » Toyota MR2 AW11 86-89 BC-Racing Coilover Kit [BR-RA]

 Toyota MR2 AW11 86-89 BC-Racing Coilover Kit [BR-RA] - #213866
Toyota MR2 AW11 86-89 BC-Racing Coilover Kit [BR-RA]

Toyota MR2 AW11 86-89 BC-Racing Coilover Kit [BR-RA]

Toyota MR2 AW11 86-89 BC-Racing Coilover Kit [BR-RA] (C-25-RA)
Front spring rate: 5K
Rear spring rate: 8K

BR Series Street and Circuit Coilover

Pillowball upper mount*
Camber adjustable top mounts*
Aluminium top plates*
30 way adjustable damping
Adjustable spring platform
Height adjustment via bottom mount to retain full damper travel
Bearing mounted upper front spring platform
Dust boot to protect damper seals
* Some features are dependent on model

The BR series coilovers use a large 46mm diameter piston in a 53mm diameter damper body to maximize oil capacity.

As the damper unit operates the oil contained within heats up. The viscosity of oil changes as its temperature varies which can lead to changes in the damping characteristic of the unit.

BC Racing only use a very high quality oil with their coilovers but go that extra mile to maximize performance and build their BR range with a large 53mm diameter damper body. This increases the capacity of the unit which increases the volume of oil contained which in turn reduces the peak temperature and so significantly improves damper performance.

Corner weight adjustment:
The lower spring platform of the BC Racing coilovers are adjustable. This allows the car to be set up for corner weighting to achieve perfect balance and ensures that maximum tire efficiency is achieved.

The car needs to be placing equal weight on each tire on an axle so both front tires need to be taking equal loading as do both rears. This makes sure that both tires are doing their equal share of work when cornering which increases overall grip, maximizes corner speed and reduces lap times.

Optional assister springs can be purchased to allow wheel droop to be dialed into the unit to suit specific needs.

Ride height adjustment
Ride height is determined by the position of the coilover bottom mount. The mount can be wound up and down the damper body to give a full range of adjustment from near standard ride height to so low it wouldn’t be drivable on the road. Because ride height is determined by an adjustable bottom mount rather than spring platform you retain full damper travel regardless of the ride height run.

Damping adjustment:
BR coilovers feature 30 way damping adjustment that combines both rebound and compression in one adjuster for simplicity and ease of use. This adjustable facility allows you to fine tune the vehicle to meet the relevant conditions.

By tweaking front and rear damping you can adjust the way the car handles. Increasing damping force on the rear relative to the front, for example, will start moving the vehicle into a more over steer orientated stance.

If you want to go drag racing in a rear wheel drive car then you want the back of the car to squat off the line to maximize weight transfer to the rear and therefore onto the rear tires. This maximizes traction and helps prevent wheel spin. To achieve this you would soften the rear dampers to allow faster compression. If you had the rear dampers set to hard, as you might run the car on a race track, then the car would be less inclined to squat so traction would be reduced.

Conversely, if you want to go drifting and are finding it hard to break traction and are having problems with under steer then making the rear dampers harder will help reduce traction whilst making the front dampers softer will give greater front traction. This will make the rear of the car looser whilst minimizing under steer thus altering the vehicles handling characteristics more towards drift than drag, road or track.

Camber adjustment:
If it’s possible to include camber adjustment on your vehicle then the BC Racing coilovers automatically include camber adjustable aluminium pillow ball top mounts. These feature the same high quality Japanese manufactured pillow ball but give the added benefit of an adjustable top mount that allows camber to be set to suit your needs be it road, track or drift.

Corrosion protection:
The damper units are black chromed steel to give superb durability even through the darkest of European winters. The aluminium components (top mounts, locking collars etc) are anodized and the steel lower mounts go through an electrophoretic disposition process followed by powder coating. A random selection of steel components (brackets, dampers, screws etc) are put through a salt spray test once a month to check the quality of the protective processes and that anti corrosive properties are kept at the highest possible standard.

High quality coil springs:
BC Racing coilovers only use the highest quality steel for their spring manufacturer. They are produced from SAE9254 high strength durable cold wound steel. The springs are compression tested through over 500,000 cycles with less that 5% deformation.

Patented concave lower locking collar:
Coilovers use a locking collar to prevent the bottom mount becoming loose. If the bottom mount becomes loose then the damper body can work its way down into the bottom mount so reducing ride height on that one corner which can lead to dangerous handling characteristics. This is a very common problem for coilovers in general. BC Racing utilize an innovative and patented designed lower locking collar with a beveled edge that seats into a corresponding bevel in the coilover bottom mount. This vastly increases the surface area that the locking collar works on and so prevents the common and dangerous problem of the locking collars working loose.

High quality oil:
BC Racing dampers use a sophisticated shim stack design and high quality oil to consistently control the compression and rebound speed of the damper rod even under the most extreme conditions. As the vehicles travels over rough ground the compression and rebound motion of the damper rod heats the oil. Poor quality dampers use cheap oil whose characteristics alter with varying temperatures. It’s vital that high quality oil is used that can maintain consistent viscosity under a wide temperature operating range. Once the oil start to degrade, its properties change leading to damping changes leading to changes in the vehicles handling characteristics.

BC Racing ensures that only high quality oil is used so that damping rates are maintained not only for the moment in hand (i.e. whilst out for a back road blast on or track) but that long term longevity is maximized with oil that doesn’t degrade quickly over time thus extending the dampers operating life significantly.

Nitrogen pressurized dampers:
When you work a damper hard on track or on high speed bumpy roads you can cause the oil to aerate and cavitation can occur. This causes foaming which effectively reduces the oils viscosity and so reduces the units damping effect. High quality oil goes a long way to help reduce this problem but BC Racing go one step further and pressurize the dampers with nitrogen. The nitrogen exerts a pressure on a floating piston which in turn exerts a permanent pressure on the oil dramatically reducing aeration and so improving the consistency and quality of the damping. The pressurized nitrogen also adds an additional element of effective spring rate to the damper unit.

Bearing mounted upper spring platform:
Because the spring twists as it compresses it is very important to minimise stiction (static friction) between the spring and its seats. If this tension is not relieved then spring binding can occur leading to the spring rate effectively altering slightly as the spring compresses and extends. The tension generated can lead to rapid deterioration of the spring pearches and in extreme cases can cause the spring platform and locking collars to loosen. This can lead to the platform and locking collars ‘walking’ down the damper resulting in un even ride height and danger of the spring dislocating under full damper extension.

The friction between spring and seats also has an effect on steering effort as the springs are physically turned with the wheels. This introduces additional unnecessary friction into the steering system which has a knock on detrimental effect on the vehicles handling characteristics.

The bearing mounted upper spring platform is one of BC Racings innovative designs. By vastly reducing stiction between the spring and its seats the BC Racing units avoid the above problems thus improving the efficiency of the steering system and allowing the spring and damper to work as designed.

Difference in Series:
The BR-Series is BC-Racing’s latest coilover model with up to date technology. Depending on your car the coilover kit will have rubber or pillowball topmounts, or no topmounts at all. For example if you car has double wishbone suspension it is not needed to use pillow ball mounts and we advise to use the rubber ones. With double wishbone you also cannot adjust camber with the front top mounts, so in most cases it would make no sense to take the more expensive pillow ball top mounts. In some cases we DO offer the pillow ball mounts as an upgrade, why is that?: Pillow ball top mount – The applications that come with hardened rubber top mounts as standard are to ensure the highest quality ride and keep costs as reasonable as possible for road and track use but we often offer a pillow ball upgrade for these vehicles should you want to remove this minimal flex and make the car a little more hardcore. Upgrading to pillow ball eliminates the flex inherent in even the hardened rubber used by BC Racing so improving the handling for those looking for the ultimate.

The product title shows the exact specification of the set, and here is a list of all possible options you can find in the product title:

BR-RS Series: Front = Rubber Topmount, Rear = Rubber Topmount
BR-RA Series: Front = Pillowball Topmount, Rear = Rubber Topmount or No Topmount
BR-RH Series: Front = Pillowball Topmount, Rear = Pillowball Topmount
BR-RN Series: Front = No Topmount, Rear = Rubber Topmount or No Topmount

Remember: This is not always a specification you can choose but it all depends on the car’s original suspension technology. We have already chosen the best suitable option for the average driver based on the possibilities of the car.
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BC Racing Coilover Adjusting Extenders BR Series 11cm
BC Racing Coilover Adjusting Extenders BR Series 11cm
Showoff price: €29,50
BC Racing Coilover Adjusting Extenders BR Series 25cm
BC Racing Coilover Adjusting Extenders BR Series 25cm
Showoff price: €29,50
 
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BC Racing
BC Racing - http://www.bcracing.nl
BC Racing General Info:
BC Racing is the own brand range of coilover kits from a large manufacturer of suspension products. The mainstay of the manufacturer is producing units for a wide range of companies including a number of premium brands within the coilover market, brands we cannot mention here for legal reasons but it many of the most wellknown Japanese and American brands. The release of the BC Racing own brand gives end users the benefit of the knowledge, manufacturing processes and economies of scale of a large suspension manufacturer but at the prices which are more associated with the lower quality units cluttering the market at the moment.

Damper testing and matching
Damping adjustment allows you to fine tune your car to suit your needs and the cars intended use. Adjustment should always be made in axle pairs, so both fronts must be tuned the same and both rears must be tuned the same.
Decreasing front damping will speed up the weight transfer as you apply the cars brakes thus increasing front traction. You want some degree of weight transfer to occur to load up the front tires to maximize braking ability and to help the front end hook up for corner entry. The front loading helps prevent under steer.
Such subtle tweaking of the damping rates can make a big difference to the way the car handles. Coilover and after market damper manufacturers run quality control system that can lead to a large variation in damper to damper performance. This means that you can have different damping rates at each corner of your car even when the dampers are dialled in to the same setting via their adjuster. Because damping settings are so crucial to a vehicles handling, this can lead to a handling imbalance where the car will pull slightly under braking and its turn in and mid corner handling characteristics can differ from left to right hand corners.
It’s because the damping rates are so crucial that BC Racing check each and every damper they produce on an in house damper dyno. The compression and rebound damping rates are recorded and the coilover kits are only put together using matched dampers. Through this in house individual checking BC Racing can be confident that the kits are produced with matching dampers. BC Racing run to a tolerance level 3 times more accurate than general original equipment manufacturers so the difference in damping rate between BC Racing units is a third of that aimed for by most original equipment manufacturers.

Straight replacement for original equipment
The BC Racing coilovers are a direct replacement for the original equipment. Unlike other brands of coilovers, the BC Racing range do not require brackets fabricating, cable ties or jubilee clips to install. The bottom mounts come with all brackets to take the original ABS sensor leads, brake lines, anti roll bar drop links etc. Just take off your original equipment suspension and install the BC Racing suspension. A straightforward and simple install.

BC Racing Benelux:
Showoff Imports is chosen as the official NL distributor of BC Racing products. Showoff Imports has over 10 years experience in modifying cars and selling/installing coilover kits. We distribute BC racing products among our clients that can be found anywhere in Europe. We also have over 200 dealers in 18 different countries so it should be easy to get a BC racing set yourself!
BC Racing is also a brand that is being used in Racing and Drifting a lot. In the Benelux you will more and more cars using the BC racing products in the professional race series like Time Attack or Drift Championships. In USA and UK the brand has already proven itself being able to perform under race use and BC racing is proud sponsor of many race series and cars.

Reviews:
Nowadays you as a car fanatic can easily look on the internet to find reviews about products you buy. We think this transparency is a positive thing since we are completely confident we sell the top notch brands only and independent reviews will confirm that to you. For your convenience we looked up some of the reviews on well-known website/forums:

Honda:
http://www.ek9.org/forum/photos-videos/9780-ek9-bc-racing-coilovers.html
http://www.ek9.org/forum/suspension/17807-d2-coilovers-bc-coilovers.html

Subaru:
http://www.i-club.com/forums/vbarticles.php?do=article&articleid=10
http://forums.nasioc.com/forums/showthread.php?t=1085379

BMW:
http://forums.bimmerforums.com/forum/showthread.php?t=1270540&page=1

Nissan:
http://www.350zmotoring.com/forums/modifications-technical/49394-bc-racing-suspension-install-initial-impression-review.html
http://zilvia.net/f/chat/139618-s13-bc-racing-br-coilover-review.html
http://www.skylinesaustralia.com/forums/Bc-Racing-Coilovers-t319277.html

Mitsubishi:
http://forums.evolutionm.net/evo-how-requests-questions-tips/239615-bc-racing-coilover-install-br-series.html
http://www.evoxforums.com/forums/showthread.php?t=15719

Mazda:
http://forum.teamfc3s.org/showthread.php?t=55531

VW:
http://forums.motivemag.com/showthread.php?4277703

Lexus:
http://www.clublexus.com/forums/suspension-and-brakes/430905-bc-racing-tein-cs-megan-or-tanabe-coilovers.html

Mini:
http://www.motoringfun.com/2008/04/11/update-bc-racing-coilovers/

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Itemnumber 213866
Shipping cost
If you would like to know the price of shipping this part to you, click here!
Manufacturer Code C-25-RA
Quality :
 Grade A
Added:02 Sep 2010
Delivery Time / Levertijd: Out of stock, delivery time available by email.
Showoff Price: €955,00

Applications for this product
Brand  Model  Years  Trim  
Toyota   MR1   -     
Toyota   MR2/MRS   1984-1989 (W1)     

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