wastegate/pressure control

[tuscandom]

who makes/supplies wastegates or pressure contol set ups for supercharger applications in the uk.cheers

[GreenV8S]

How (and why) would you use a wastegate with a supercharger? Perhaps you mean turbo?

[tuscandom]

been reading about some of the tricks across the pond..they have used a wastegate designed for lowering air pressure in the intake manifold (used withe centrifugal type charger)...to cut a long story short..it enables you to bring the boost in lower down the rev range to improve torque and releases excess pressure..they are very different from a dump/blow off vale as they maintain a constant pressure ,the bov ,i think is still used as normal...just dont know where to get one ????

[GreenV8S]

Sounds as if they are over gearing the blower and then using a blow off to prevent excessive boost at the top end. I use a recirculation valve to take the load off the blower under cruise conditions, which is basically throttle which is opened by a vac cannister. What you're talking about would require a throttle opened by a boost cannister, which is basically what a waste gate is. I think that a dump valve would achieve the same thing i.e. opening under pressure to limit the maximum pressure, you would just reference it to atmospheric rather than to manifold depression.

[tuscandom]

exactly...apparently the wastegate set up they use is better than a dump valve because it maintains a constant pressure whereas the dump valve will build to and then dump giving an irregular pressure,also the dump valve is still used when the throttle is closed sharply i.e. on/off revs to release the manifold pressure build up

[chuntington101]

it has been done in the US. worked pretty well from the articale i read online.

basically you use a turbo wastegate to vent off any unwanted presure from a supercharger (SC). this can work with roots, twin screw or centrifugal SC's. their are a few people looking to use them on roots/twin screw chagers to help with traction out the hole.

the main viable use is on the larger centrifugal sc's as a way of limiting power in each gear (helping with traction) or for diffrent ECU maps (one for race and the other for normal fuel).

basically you use a large SC that will meet your highest needs. obviously this will give you way too much boost on the road, so you vent the presure down to a lower presure. the other advantage is the boost will come on sooner in a centrifugal SC giving a stronger mid range.

the alternative to a wastegate is a restrictor plate. again a tried and tested idea but with some drawbacks. firstly from testing i have read about the restrictor plates limit the SC aross the whole range, not just at the top end. this means that no matter how fast you spin it the boost will still come in a the same point. also its not adujstable like the 'gate is.

thanks Chris.

[tuscandom]

any idea whre i can get something similar...before i start bodging one together !!

[GreenV8S]

A centrefugal blower with a small CVT in the drive would be the best solution, but the closest I've seen so far as a two speed mush box affair. Putting a pressure limited would be a decent compromise, it just means you're wasting a small amount of energy. I assume you would set it up to recirculate and not just dump it.

[cptsideways]

Just use a standard off the shelf boost controller electonic solenoid actuated type, in line to valve. Might as well use a dump valve too if there is no heat involved, wastegates are'nt really designed to sealed completely.

[tuscandom]

cheers all