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Forge Blow Off Adaptor FMDVMCS for BMW Mini Mk2 Cooper S Turbo (R56 & R57) (2007 >)

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Price £75.00 inc. VAT
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Make BMW
Model Mini Mk2 Cooper S Turbo (R56 & R57)
Year 2007 >
Style Blow Off Adaptor
Manufacturer FORGE MOTORSPORT
Manufacturer Part FMDVMCS
Larkspeed Code FMDVMCS
Product Information
Delivery & Returns

SPECIAL OFFER - FREE SHIPPING on this item to all UK Mainland Addresses (Excludes Highlands, Islands and Northern Ireland.

This Forge Blow Off Adaptor is a sandwich type adaptor that fits between the existing electrical solenoid and the turbo charger housing. On the Coopers S Turbo there is a bypass facility built into the turbocharger housing. This allows charge air to be recirculated around the turbo charger from the boost side back to the intake side. This recirculation path is opened and closed by means of an electrical connection from the engine management to a solenoid that is mounted on the turbocharger housing. As you accelerate , the turbo charger vanes are spinning and boost pressure is increased, literally blowing into the engine cylinders. Then when you change gear you take you foot of the accelerator momentarily, select the next gear, and accelerate again. As you take your foot off the accelerator the throttle valve to the engine closes. The problem here is that during this process the turbo is still spinning and the boost pressure that it is producing has no where to go. This is a bit like putting you hand over a hair dryer so the air cannot get out.

At this point the turbo starts to stall, the spinning vanes slow down (incurring a lot of stress) and the boost pressure drops. When you open the throttle valve again by pushing down on the accelerator the turbo has lost its momentum & boost pressure, and there is a time lag before the engine can produce the required power again.

To combat this loss of power and stress on the turbo, a recirculation or diverter valve is used. On the Mini, when the throttle valve closes, the engine management opens the recirculation route around the turbo. This gives the charge air an alternative route and allows the turbocharger to keep spinning so that when you accelerate again there is no time lag. This system works well and is adopted by nearly all vehicle manufacturers on turbo charged petrol engine applications. The only downside to this system is that turbo chargers produce heat. (The hot air that leaves a turbo is cooled by passing it through an intercooler before it enters the engine. The cooler the air the more power is produced.) By recirculating the hot air back into the intake side of a turbo the temperatures increase.

This is where the Forge Blow Off or Dump valve plays its part. By expelling the charge air to atmosphere rather than recirculating it, you do not increase the intake air temperature but you do allow the turbo to keep spinning. The side effect which is unacceptable to most vehicle manufacturers is the noise of the valve expelling the air. By fitting this Forge Motorsport Adaptor between the existing solenoid and the turbo housing (this involves removing only 3 bolts) the air is re-directed to atmosphere rather than recirculated.

It should be noted that the engine management also uses this valve to decrease engine power when necessary. An example of this is by the (DSC) Dynamic Stability Control system. Although you would not normally hear this occurring, when a blow off adaptor is fitted you may well hear the air being expelled when the DSC operates (going too fast around a bend for example)

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Location Weight Price
UK Mainland Up to 2kg £5.95
UK Mainland Over 2kg £10

Mainland UK shipping does not cover Highlands and Islands and selected postal areas. The Postal Code areas listed below will in some cases incur extra postage charges.

AB31-38, AB40-56, All BT Postal Codes, All HS Postal Codes, All IM Postal Codes, IV1-28, IV30-32, IV36, IV40-49, IV51-56, IV63, KA27-28, KW1-17, PA20-38, PA41-49, PH4-44, PH49-50, All ZE Postal Codes, All Channel Islands and all Republic of Ireland addresses

For shipments up to 30kg

Location Price
Highlands/Islands/Selected Postal Areas £20
Andorra £55
Austria £45
Belgium £40
Channel Islands £35
Croatia £55
Czech Republic £55
Denmark £55
Estonia £55
Finland £55
France £40
Germany £50
Greece £55
Hungary £55
Ireland £30
Isle of Man £30
Italy £55
Latvia £55
Netherlands £50
Northern Ireland £30
Norway £75
Poland £70
Slovakia (Slovak Republic) £55
Slovenia £55
Spain £55
Sweden £45
Switzerland £65

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Deducting VAT

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