An inexpensive upgrade for turbo MINIs

The ALTA Blow Off Valve Spring Upgrade is a great alternative to complete BOV replacements. Fits all MINI Turbo Models including Cooper S and JCW! The ALTA replacement spring is a simpler, less expensive and better performing upgrade.

So Simple, Yet So Effective

The ALTA BOV Spring Upgrade for your stock Blow Off Valve is a very effective way to make your Turbocharged MINI hold more boost between shifts. This reduces turbo lag and boosts performance. The stiffer spring still allows for normal functioning of the BOV, but keeps more pressure in the boost tubes to prevent any lapse in power.

Installs In About 30 Minutes!

Anyone with simple hand tools can install this part in under 30 minutes. Simply remove a handful of parts including the electronic BOV and then just replace the factory spring and your done! Check out the instructions above for a step by step explanation.

Tested to hold 40 PSI of boost!

Our product designers developed this test fixture to test a variety of spring rates before even attempting an in-car test.

A key to the design of this part is ensuring the spring is not too stiff. Because this is an electromechanical device, it is crucial that electronic solenoid is able to open the blow off valve. The ideal spring rate was chosen and then tested to work perfectly in excess of 40 psi of boost! While you will never see that level of boost, it is comforting to know that your blow off valve is now up to the task of handling anything you throw at it!

So Many Features

Here is why the ALTA Blow Off Valve Spring is the ideal upgrade:

• Custom made heat-treated 17-7 Stainless Steel Spring
• Rated for over 7,000,000 cycles
• Makes turbo response better between shifts and less turbo lag
• Holds and vents 40psi perfectly
• A fraction of the cost of complete blow off valve replacements

Wikipedia

A blow off valve (BOV) or dump valve is a pressure release system present in most turbocharged engines. Its purpose is to prevent compressor surge, and reduce wear on the turbocharger and engine. Blow off valves relieve the damaging effects of compressor "surge loading" by allowing the compressed air to vent to atmosphere, making a distinct hissing sound, or recirculated into the intake upstream of the compressor inlet. The turbo MINI Cooper S and JCW both have BOVs that are controlled by the ECU. These large solenoids opens the valve and dumps the excess boost pressure. The ALTA Blow Off Valve Spring upgrade is a stiffer spring to make the valve close faster after shifts and hold more boost! » Read More

5 Year Warranty

ALTA Performance warrants to the original purchaser, all ALTA products to be free from defects in material and workmanship within a sixty (60) months period from the date of purchase. *Some exclusions apply
» Read Full Warranty

Quick Reaction

The stock CRV is actuated electronically by the ECU, which may sound quick, but is actually a much more delayed process than one might expect; there are delays in the ECU when determining when to open the valve. This effects how quickly it blows off, which can lead to compressor surges, which leads to turbo damage or even failure. The ALTA CRV uses the tried and true method of using intake manifold vacuum and pressure, along with turbo pressure to open the valve. This means the moment you start to lift your foot off the gas, the ALTA CRV will start to release boost pressure keeping your turbo safe!

Holds Any Boost Level

Cars with an ECU tune that increases boost levels will enjoy this part as you will never have to worry about it leaking under boost. The BOV is designed in such a way that the boost pressure pushing it closed is greater than the pressure trying to open the valve under boost. This means that 10psi, 20psi or 30psi of boost is no problem for it to handle!

Long Lasting

Less is more! The ALTA CRV consists of four very simple purpose built parts. The diaphragm and spring are the same items used on the high tech Borg Warner EFR turbochargers, which means they are meant to easily handle extreme conditions and not fail. This is one of those parts you install and never have to worry about again.

Gets rid of Check Engine Lights

There are many Check Engine Lights and Diagnostic Trouble Codes that start to appear as your stock CRV ages. The P28AA (Compressor Bypass Error), P2c91 (Possible Seized Compressor Bypass), P2c90 (Compressor Bypass Seized/Closed), are all very common to see on cars that have more than 50,000 miles on them. These codes all appear because of the many faults with the OEM part. Getting rid of your stock CRV can do many good things for your car, such as eliminating turbo-damaging compressor surges, eliminating DTCs/CELs for faulty or sticky CRVs, and improving both drivability and power!

Thick Diaphragm

A common problem with the stock CRV diaphragm is ripping at higher boost levels and normal wear and tear. The stock part is made of silicone and rubber with no reinforcement to it. So when it starts to fail, it fails quickly. The ALTA CRV has a high quality rubber diaphragm with reinforcement to keep it lasting for the life of your car.

You May Also Want:

ALTA Boost Port Adapter

Don't want to drill a hole in your intake manifold? The ALTA Boost Port Adapter is an easy way to get a boost source without having to make irreversible changes to your intake manifold! Simply remove your intake, plug into the map sensor, and you're ready to go! Learn more about the adapter here.