Search for nocab's video. He shows a closeup of it. The T04 is not BB unless ordered that way. Yes, the 35/40 is a T3 flange

 

The TO4R and the GT 35/40 have the same compressor side. The TO4R is not BB and never was. HKS does not offer a BB option for this turbo, and unless some other company is taking them apart and rebuilding them with BB cartridges, they don't exist. The exhaust side on a TO4R is your standard P-trim Garrett wheel and housing. The GT 35/40 exhaust side is your standard restrictive somewhere between T3 and T4 HKS proprietary rotary blower. If you are happy with 450-475rwhp at 17-20psi then go with the 35/40. If you want to make that power at 14-16psi then go with the TO4R. In my opinion I think you guys should leave the GT series turbos to the 2L 4cyl guys since that's what they were made for.

 

i coulda sworn mitch's hks was BB i guess not ??



http://www.hksusa.com/products/?id=824

 

I think ppl may have read about a T04R BB from A-Spec's site: http://www.a-spectuning.com/products/rx/turbo.shtml The T04R is not BB.



BTW, where can one get more info on the T04Z...can't seem to find it on Google.

 

I was under the impression it was not BB, and the to4Z is a BB to4R...

 

whoo hoo!!! I was right!

 

Rats, guess I better start over then Keep in mind the GT series goes a lot bigger than the 35R!!



Seriously, the GT35R works pretty good on the 2L 4 bangers, though I think they use the smaller exhaust housing. The original question was a streetable turbo, and the 35R meets that requirement.

 

Well, the t-04R is a streetable turbo as well. Cheaper to repair if things go wrong. Good top end power(since Dave exhaust ported his car). And proly easier to find too.



I like the quick spool up of the GT35/40, but that might have something to do with the small exhaust flange(T3) and it being ball bearing.

 

Ok so at what RPM range do these reach full boost?

 

I would expect the t-04R to reach full boost later than the GT 35/40...possibly 400 rpms slower.