Boostage

turbine is technically smaller than the -9 while the compressor is just a little bigger. 2560 turbine=53mm -9 turbine= 53.9mm 2560 ind/exd=44.5/60.1 -9 ind/exd=44.5/59.4 Biggest difference seems to be the compressor a/r's . -9 is .42 and 2560 is .60 So to break it down, one turbo has one thing bigger or smaller while the other turbo has something else bigger or smaller. and technically they are rated at the same power levels for the same range of engine sizes. so it just appears to me that they will perform pretty close to each other. but I just wanted the feedback of people like you who are obviously smarter than I am.

Discopotato03 Im not running an RB I have a 1jz with custom manifolds.. Those turbos there I think are oem rb26 turbos which are now sold. I can run any turbo. sr20,stock rb, any upgraded RB turbos pretty much any t25 based turbo. so fitment is not the concern as I dont have my downpipes made yet. and if it help. my compression is close to close to 10.1 the the 2560r here will cost me $1400 shipped for the pair. -9's will cost me $2300 + shipping for the pair. again, either will fit since Its not an RB or a Skyline. however it is a 2.5L inline 6 with ITB's Considering its going to be like $1000 difference in price I just wanted to make sure its worth getting -9's over what appears to be SIMILAR specs on the MUCH cheaper sr20 s15 turbos

Thats an extraordinarily Interesting point of view on the subject, however I would still like your opinion on the feasibility of the 2560r being able to mimic the power curve/production of -9's. also to addres your comment about not saving much money, I can assure you the initial cost of the 2560r's is at a minimum $600 less. which is enough left over change to accommodate other useful components.

I know the head is quite different, I am however building a Jenvey ITB's setup I just got the intake Plenum from Reverie in the UK This is Next to the stock 1jz intake In the end I expect it to be similar to an Rb26, but we will see.

no

the Rb has the closest bore and stroke. I really have no data to go off of as Most JZ guys just run Single turbos. so it really is just experimenting.

R31Nismoid that was a very educated guess and thats all I was looking for. and I agree. i will try it and post the results.

I didnt ask about fitment.. and none that I listed are -5's .My question is, between these two turbos would there be a noticeable difference in performance considering the MINOR difference in specs? 2560r specs Compressor: 46.5mm Inducer 60.1mm exducer .60 trim exhaust: 53mm .62 trim -9 specs Compressor: 44.5mm inducer 59.4mm exducer .42 trim exhaust: 53.9mm .62 trim Im not concerned about fitment and I am not asking about -5's aka 2530's aka gt2860 etc I am only asking about the performance of what I listed

I have a 1jz with custom t25 flanged manifolds, thats not an issue for me. But if you have an answer to my question, please feel free to reply.

I did a lot of research and the general consensus is that the GTSS/-9 is the best street setup, providing a wide and torquey powerband. but the 2560r costs a bit less here in the states and honestly doesnt seem that far off. specs for 707160-9: http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT28/GT2859R_707160_9.htm And then the 2560r: http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT25/GT2560R_466541_1.htm The exhaust wheel on the -9 is .8 bigger but the compressors iducer/exducer on the 2560r is 2mm bigger 1mm bigger respectivly. biggest difference I see is the A/r of the compressor housings .42 vs .60 Would getting the 2560r feel a lot less responsive and provide noticeable less low and mid range than the -9?

I was actually reading on gtr.co.uk thats the 2860r's are pretty decent.

Car details: 1996 S14 1jz-gte with 264 cams/springs and retainers. I recently bought a Custom TT kit for my 1jz, that has stock skyline gt28r twins.. Now I understand that the stock RB twins have ceramic wheels and also not big enough to meet my power goals of around 525rwhp. Here is a dyno of a very similar 1jz kit but with steel blade gt28r's.. Thats the poweband I want but with about 50rwhp more before it starts to fall off. that 480rwhp was made on 21psi. but I dont know the specs on those particular gt28r's so What I am trying to find out is this: if I upgrade stock to steel wheel, what would be the turbos' safe rwhp limit? Or should I just get new turbos? if so what do I get? gt2530? gt2871? I am willing to give up just a little response for a bit more top end power/RPMS. but I dont want a slug under 3k.. dare I say I would like a good compromise of response and all out power similar to the MINES Skyline