New Compressor Covers

[Billet Ricky]

I thought I’d show you guys the new compressor covers.

The NEW race cover is standard fitment on all the 70mm to 76mm Billet turbos and all the 66mm to 75mm (ETT) S Series Billet Turbos

The Big cover in the pic is the Pro DRAG cover. It suits all the Pro DARG turbos from 88mm to 106mm

Sorry for the picture quality. They were taken on my phone.

Inside Billet GTSR compressor cover. Note the extended defuser area.

Here is some pic's of other compressor covers to compare.

Garrett TA cover. (Cover used on Garrett T51R)

Garrett GT42 cover.

[discopotato03]

Hi Ricky , yep definitely a step in the right direction .

I don't know if people remember but HKSs TO4Z comp covers are a bit like that diffuser diameter wise as are many of the truck ones on Holsets and possibly Borg Warners .

I'm not sure if the cross section of that housings diffuser is like OEM ones are , would need to cut them open to find out .

Diagrams I have of housing cross sections show the diffuser to be reasonably thin walled and I suppose thats to take up minimum area of the housings volute passage .

The diffuser section of any radial compressor housing is critical because its where velocity energy is converted to pressure energy .

Often when a turbocharger is "high flowed" with a larger diameter compressor wheel in the same cover this area suffers because the wheels diameter is larger but the diffusers diameter stays the same .

Cheers A .

[Billet Ricky]

Hey Disco, Thanks for the comments mate.

Not all the HKS T04Z have the extended defuser area. I have seen both some with and some without.

You will find the newer HKS T51R KAI and SPL have a similar defuser area.

Another cool update is the Billet 76-GTS is available with a T7 billet compressor wheel. The model is called B76-GTS

[discopotato03]

Will have a look into those , cheers A .