roberts

Thanks for posting Will stick with .52 trim version then

Bump for this cause deal for 2871 ending soon.. Any comments about 2871r's 56 trim version instead of 52trim?

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.

Thank you for your suggestions Disco! 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. Too bad this kind of knowledge comes a little too late, because I was really thinking it's a great turbo as I was looking for info all over the web and everyone was positive about it. Maybe the posts were old date.. Is there any car on earth gt3071r would do good job?

Thank you all for answers and inputs. I've done much reading all over the web regarding gt3071r's and housings and see it's more complex than I thought.. blade shape and amount - all matters. As I would sacrifice all "more compact" thing and refab mani and pipes to fit it, I want best performing turbo I can get using this chra. Disco, would you share your knowledge more to help me choose from parts available. What would be your choice for compressor and turbine housing? I don't think I can find HKS comp housing for sale anywhere but besides there should be some alternatives. It is possible to get port shrouded housings from Garrett and to machine anti-surge ports if necessary. What about GT30 based turbine housings for gt3071r people (Disco mostly) are talking about? Are there some available for externally gated setups? Thank's for answer in advance..

There's no way to think of other turbo options because this 3071chra is laying around about two meters from me now.. What I thought gt3071r is better comp/ turbine wheel balance than gt2871r turbos. That's why I made my decision when got good deal for this chra. I am wrong about this? What I see, is that HKS 2835 uses the same compressor housing as Garrett p/n 756021-3 It's port shrouded A/R .60. I believe it's t04b style housing.. isn't it? Too bad I can not find someone to sell them seperately. What I think they are not available anymore. Here is Garrett answer I found about question regarding swaping vice versa gt2871r / gt3071r housings -> November 2007: Optional Turbo Housing A/R Effects Question: After searching the Internet extensively and look through your distributors I have been unable to find a compressor map for a GT2871R (743347-2) with the optional compressor housing (756021-2) to get an turbo configuration of 53.1 Ind Whl dia, 71.0mm Exd Whl dia, 56trim and an A/R of .50. Would this configuration have the same effective compressor map as the GT3071R family line with the same configuration specifications (53.1, 71.0mm , 56 trim, A/R .50)? - Mark D. Answer: The compressor wheel used in turbo 743347-2 and CHRA 700177-23 are the same. The difference obviously is the compressor housing and the A/R. The smaller A/R housings are designed to move the main efficiency island to a higher pressure ratio effectively making them perform better on applications running higher manifold pressure. The difference in choke flow is mostly due to the fact the GT3071R map was run to 140000 rpm where the GT2871R only 127000. The correct housing (A/R) depends on what pressure ratio your engine will be operating. Keep in mind 350whp and 400whp will be at two different pressures and end up on different points of the map. This is where map shape comes into play. The map on the internet for the GT3071R family represents the map for the compressor housings used in the 756021 kits. (dirrect link to this) So putting compressor housing from gt2871r to my gt3071r chra really would make turbo more responsive with same compressor map as gt28?! What I don't really understand is turbine wheel role in compressor map.. Seems like it will be really hard to find HKS2835 comp housing as well as t04b Garrett with A/R .60 And if we talk more about anti surge ported housings, why you don't suggest it "hypergear"??

Mafia, you know sometimes it's better to combine turbochargers for exact engines and setups. I am not saying this is my case.. that's why I am gathering opinions to make it right first time. gt3071r is not that big for 1.6 and as long as I can rev it high lag doesn't bother me much. I wished gt2860rs could give me more top end for the money spent.

Actually I posted on this forum because I hoped you (discopotato03) would get me into right direction. I did research on other discussions about gt30 family turbochargers and you seemed to know a lot. It's going into my 1.6 liter single cam Honda which was on gt2860rs last season. But as turbo is maxed out of it's capability I am upgrading to gt3071r as it seemed best power/response for my goals. I am aiming for about 400hp at the wheels with new turbo and car is daily driven as well as I am taking part in some dragrace events. New chra which part number is 700177-5022 have following spec's: Turbine -Wheel: 60mm w/ 84 trim Compressor -Wheel: 71.1mm w/ 56 trim So you say T04B housing which originally comes with GT2871r is smaller inside diameter (70mm)? I will try to find those HKS housings and paste links here to be sure with are suitable. I know it's kind grey area and outcome could differ, but I think with great minds and thoughts we can reach reasonable outcome.

Yeah, it's for 1.6 liter engine. I am upgrading from GT2860rs with T3 .63 housing. Turbo is now maxed out @ 330hp on the wheels So now I am looking for most compact housings due to low sitting manifold (it would cause drain problems and charge pipes sit's really low)

Well, do some research. Some of the larger housings shows poor results just of it's design. People are "upgrading" from gt2871r housings to gt30 ones and it's discussed as pointless. Then why not opposite? Not even commenting your pointless comparisons.. I am takling about both wheel diameters vs housing options Probably you wonder why would Garrett make so small turbine housing for 60mm wheel? Well IT DOE'S.

I've bought bare Garrett GT3071R chra and I am now looking for appropriate compressor and turbine housing to complete it. As my turbo manifold sits down quite low, I would like to gather most optimal and space saving setup. There are few compressor and turbine housing choices and I would like to understand how each of them will affect performance of turbocharger. I am looking right now for GT2871R (T04B style with 3" inlet and 2" outlet) compressor housing because it's smaller than any other GT30*. Are there some benefits using big GT3071 housing instead of GT2871? Quite same dilemma is turbine housing. The longer will be the snail, the more trouble I am going into (oil drain, charge pipes). SO I found there is option to put T3 2.5" 4 Bolt Turbine Housing (here's link: http://himni-racing.com/index.php?ma...oducts_id=1687). Again.. I don't know it it would be good idea to put so small exhaust housing for 60mm turbine wheel?! I am looking for T3 flanged housings because my exhaust manifold flange is T3. Hope for some advice!