Choosing Cold And Hot Side Housing For Gt3071R

[The Mafia]

sounds like the RB25 VCT.

Advances the Inlet cam something like 15-20degrees and sets it back to normal at 4500rpm.

The complete opposite of VTEC.

Can you get a controller to modify it, so you can specify when it comes on and off? Would be worth the experimentation.

[Rolls]

Nah it is completely different, it changes the complete exhaust cam profile over at high revs, eg it is inactive below 4500 rpm and activates from there to redline, where as the VCT just advances the intake cam.

[wolverine]

HKS GT-RS sounds like it is made for your application.

I personally would start from scratch and write off the cost (try to get a return credit) and get a T3 turbo with known turbine/compressor housing combos. The cost of buying and machining turbine and compressor housings from here will prove an expensive exercise with no real guarantee of a good result.

It seems it's really better to sell my new chra to someone else and look for gt2871r as it will give me better powerband with same top end.

Are you going externally gated? If so there are some nice Tial turbine housings as an option for a GT2871/GT-RS sized turbos.

I think you are going the best way by re-thinking using the CHRA you have.

[roberts]

Thanks everyone who posted to share thoughts and knowledge!

As for vtec, it changes to different (more aggressive) cam lobes when engaged. Timing and vtec engagement can be adjusted with some great tuning softs through oem Honda ecu.

Wolverine, I was already externaly gated so I will be the same on new turbo.

Disco, what do you think of 2871r's 56 trim version instead of 52trim? I might get good offer for 56trim so I am looking compressor maps to compare ->

But as compressor maps can not show all I would want to hear people experience. Also do you think .63 or .82 exhaust housing would be better choice?

P.S. Hope you and all and Skylines are fine there in Australia because of massive flood.

[hypergear]

And if we talk more about anti surge ported housings, why you don't suggest it "hypergear"??

Sorry missed your post earlier. Would you (or any one) know any advantages that should be mentioned in having those anti surge slots in this specific setup?

[badhairdave]

Hey mate

I've tuned a couple of SR20s that have them, and no, didn't do that good of a job at all. For some reason, I felt a 2871 or a 3076 with small housings would have been better.

Proper ones or the horrible t2 int gated things? With the right cams a proper 3071 will make boost earlier than a 2871 and destroy it up top.

Mine, just a regular -5023 3071 with a .63 rear on a china manifold with short duration big lift cams and springs. engine is stock otherwise.

[roberts]

Bump for this cause deal for 2871 ending soon..

Any comments about 2871r's 56 trim version instead of 52trim?

[discopotato03]

I thinkn I said earlier that is the worst one lag wise , it would be my last choice for a GT2871R .

A .

[roberts]

Thanks for posting Will stick with .52 trim version then