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Browse more MINI Cooper Blow Off Diverter Valves

Blow off Adapter Diverter Valve Upgrade - recommended for the MINI Cooper S with increased boost, and for unmodified MINIs in warmer climates. Fits between the existing electrical solenoid and the turbo charger housing.  For the Cooper S with the N14 engine 2007-2010 and also JCW models with the N14 engine thru 2012.

Fits the following models with the N14 engine:

2007-2010 R56 MINI Cooper S Hardtop
2008-2010 R55 MINI Cooper S Clubman
2009-2010 R57 MINI Cooper S Convertible

Also compatible with JCW models with the N14 engine thru 2012. 

On these engines, built into the turbocharger housing, is a bypass facility. 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 off 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) What happens at this point is the turbo starts to stall, the spinning vanes slow down (incurring alot of stress) and the boost pressure drops. When you open the throttle valve again by pushing down on the accelerator (demanding more power) the turbo has lost its momentum, boost pressure and there is a pause or a "Lag" before the engine is producing the required power once 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 "lag" or waiting period. 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 a 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 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 Adapter 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).

Bypass / Recirculation Valve Basics

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) What happens at this point is the turbo starts to stall, the spinning vanes slow down (incurring alot of stress) and the boost pressure drops.

When you open the throttle valve again by pushing down on the accelerator (demanding more power) the turbo has lost its momentum, boost pressure and there is a pause or a "Lag" before the engine is producing the required power once 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 "lag" or waiting period. This system works well and is adopted by nearly all vehicle manufacturers on turbo charged petrol engine applications.

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 to fast around a bend for example)

NOTE: Some states (like California) have ever tightening requirements for emissions testing and inspections. Always check your current state regulations on compliance for street use before you order.

 

MINI Cooper N14 Diverter Valve Upgrade - recommended for stock or modified Cooper S models including the 2nd generation 2007-2008 MINI Cooper S models including the R56 Hardtop and R55 Clubman.
Diverter Valve Upgrade N14 MINI Cooper S Gen2 R55 R56 R57

Diverter Valve Upgrade N14 MINI Cooper S Gen2 R55 R56 R57

Diverter Valve Upgrade N14 MINI Cooper S Gen2 R55 R56 R57
Part No: G2NME3071
$100.63
Qty:
Fits the following:
MINI (2002-Current)
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Alternate Products
MINI Cooper S JCW, N14 engine, Blow Off Valve Upgrade, Clubman R55 Hardtop R56 Convertible R57
$351.07 MINI Cooper S JCW, N14 engine, Blow Off Valve Upgrade, Clubman R55 Hardtop R56 Convertible R57
DV+ Diverter Upgrade Blow Off Valve for N14 Turbo engine for MINI Cooper S R55 R56 R57 (2007-2010) Gen2
$167.24 DV+ Diverter Upgrade Blow Off Valve for N14 Turbo engine for MINI Cooper S R55 R56 R57 (2007-2010) Gen2

Browse more MINI Cooper Blow Off Diverter Valves

Blow off Adapter Diverter Valve Upgrade - recommended for the MINI Cooper S with increased boost, and for unmodified MINIs in warmer climates. Fits between the existing electrical solenoid and the turbo charger housing.  For the Cooper S with the N14 engine 2007-2010 and also JCW models with the N14 engine thru 2012.

Fits the following models with the N14 engine:

2007-2010 R56 MINI Cooper S Hardtop
2008-2010 R55 MINI Cooper S Clubman
2009-2010 R57 MINI Cooper S Convertible

Also compatible with JCW models with the N14 engine thru 2012. 

On these engines, built into the turbocharger housing, is a bypass facility. 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 off 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) What happens at this point is the turbo starts to stall, the spinning vanes slow down (incurring alot of stress) and the boost pressure drops. When you open the throttle valve again by pushing down on the accelerator (demanding more power) the turbo has lost its momentum, boost pressure and there is a pause or a "Lag" before the engine is producing the required power once 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 "lag" or waiting period. 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 a 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 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 Adapter 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).

Bypass / Recirculation Valve Basics

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) What happens at this point is the turbo starts to stall, the spinning vanes slow down (incurring alot of stress) and the boost pressure drops.

When you open the throttle valve again by pushing down on the accelerator (demanding more power) the turbo has lost its momentum, boost pressure and there is a pause or a "Lag" before the engine is producing the required power once 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 "lag" or waiting period. This system works well and is adopted by nearly all vehicle manufacturers on turbo charged petrol engine applications.

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 to fast around a bend for example)

NOTE: Some states (like California) have ever tightening requirements for emissions testing and inspections. Always check your current state regulations on compliance for street use before you order.

 

 
 
Question:
Will this fit my 2011 New MINI Cooper JCW R57? It has the N14 but the site assumes I have the N18 because the parts configurator doesn't factor the JCW.
Answer:
Forge UK has stated the G2NME3071 Blow Off Valve Diverter upgrade is compatible with all N14 engines, so it will work on your 2011 R57 Cooper S.

Mini Mania Tech Team

The MINI Cooper Parts and Accessories Experts

 
 
 
 
Question:
Do I need any other parts for this BOV before I buy it and mount it??? Or do I just need to buy this one part and mount it as it comes?
Answer:
The G2NME3071 Diverter Valve upgrade does not require any additional parts to complete the installation.

Mini Mania Tech Team

The MINI Cooper Parts and Accessories Experts

 
 
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Related Technical Articles:
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The Mini Cooper engine comparison allows for a better understanding of the N14 and N18 engines from BMW
MINI Cooper Blow Off Diverter Valves
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These valves (wastegate) control the potential of the Turbo Charged MINI engine. Direct replacements, can upgrade performance & longevity.