Not sure you will need the AS cover and it does rob a little bit of power.
Chad said I wouldn't need it on my build and he was right. Mine is a 3B on a 2.3 with GSC head. As Chad said in the other thread, these are close if not the same turbos that Blouch was producing for CBRD.

 

What makes you think that you'd need an AS cover? Get a big enough turbo that takes a little bit of time to spool and you'll be good :P

Surge is annoying though, and I hadn't ever experienced it until I went back to the stock 9.8 turbo on my 2.3.

 

Can just as easily ask what makes you think that he won't need an AS cover? Comes down to which side do you want to err on.

Garrett describes ported shrouds as follows:

A Ported Shroud compressor is a feature that is incorporated into the compressor housing. It functions to move the surge line further to the left by allowing some airflow to exit the wheel through the port to keep surge from occurring. This provides additional useable range and allows a larger compressor to be used for higher flow requirements without risking running the compressor into a dangerous surge condition. The presence of the ported shroud usually has a minor negative impact on compressor efficiency. http://www.turbobygarrett.com/turbobygarrett/surge_line

Without seeing the compressor maps for the Dom 1.0, 2.0, and 3.0 (and yes I have asked Blouch for the maps and they said they would not release them ), trying to pair a particular engine and desired boost to one of their turbos is like throwing darts in the dark. IMO, that makes a ported shroud a smart choice until these turbos prove that surge is not an issue for "most" evos.

There is a reason a great many turbos come with ported shrouds, and that Blouch offers them as an option.

Read more about surge here http://www.gfb.com.au/tech/tech-arti...mpressor-surge

 

i have a MAP ef2.5 that i ran without, then with the AS cover. i notice no negative effects.

FWIW.

 

tick tock my turbo hasn't showed up yet.........I keep getting boxes but not a turbo for my build

 

Subscribed and interested!

 

Found someone who use to carry cbrd bbk turbos this is what he said

well we have the BBK Full Equiv… Blouch will now sell the EVO Turbos as well.. before they had deal with CBRD for exclusive but that is passed now

Yes that is it

Dom 1.0 which is their full… only difference is the 1.0 has a new Compressor wheel that flows more

 

CBRD dont do the BBK turbos anymore.. thy have gone over to turbo kits from Borg Warner.. WE buy the EVO Turbos direct from Blouch, who make the CBRD Turbos and have them in stock.

the BBK Full equivalent is Blouch RBK-L

 

Rbk L is their product line of the dominator comes with a red wheel.

 

Nemsin, I read that link. Nothing I didn't already know, but that BOV dart shooter was hilarious.

I rarely have an issue with surge on my stock turbo 2.3 Evo 8. The issue only arises at partial throttle, full boost at low rpms which I attribute being the boost controller's fault (If I had an EBCS, I wouldn't build full boost at such a low rpm)

I've had an AS cover on my old 90 AWD TD05 20G. Couldn't spool that fast enough down low to have any issues.

Either way, I've never really noticed a huge difference. If you want one, go for it. It doesn't rob enough airflow to not get one. At the same time though, I don't see the point on most setups.

 

BBK- to RBK lol- creative

cb

 

Well it is actually used out of this country but I know what you mean.

 

so chad is it true about CBRD using Borg Warner turbos? If so what can we expect from the new turbo line? I wish it was happening sooner then later, because I am in the market for a BBk full type of turbo.

 

did you find chad's efr turbo thread yet?

 

I just saw something for evo x. Wish I didn't miss out on the gravey train when cbrd had the bbk turbos. I just joined the evo seen in feb. I read a lot of good things about chad's products and great customer service.

Exchanged a few emails with him regarding the bbk full only to be disappointed in my finding's that cbrd no longer sell the bbk line.