R34n1 Turbos Id Wierd Number? What Do I Have? 707160-4

[magmazin]

Hi guys, I recently purchased a pair of R34 N1 Turbos from Japan and I am curious what exactly I have. I have searched multiple forums for the different R34 N1 turbo info and I found a lot here(some of it confusiing), but I also read that they had different specs available, Vspecs N1s?. I was told mine are Nissan Skyline BNR34 N1 turbos. The info on first line of garret tag is “DF 0106J” second line “1441-aa402” third line 707160-4” The other turbo first line “DF 0113J” second line 14411-aa402” third line “707160-4”. The int is A/R 60 M24 and the ex is .64. I tried doing a search with the different numbers but could not come up with a direct match. The closest I came was the garet 707160-5 or 707160-7. I imagine mine is like a 707160-5(AR60 with .64ex) which is in the 2860R family, but I was reading and it seemed that there may be different variations maybe with the wheels/trims but I'm not sure. I also wrote Garret and they wrote back "These are the same turbos. The difference in part numbers has to do with OE and aftermarket applications. Essentially, you have a pair of GT2560R’s. Regards, Garrett Gearhead." I also recall that the may have changed some of their numbering system for their turbos at one point.

Of course I am just trying to figure out if these are the best turbos for my application but I am not sure what they are comparable to. I would like to know how they compare to HKS 2530s as this seems to be the popular setup.

HKS 2530s vs BNR34 N1s 707160-4(or -5)

Compare

What RPM do they hit full boost

When do they run out of breath/effeciency ~21psi?

How much power are they good for compared to the 2530s

Advantages/disadvantages

Just trying to figure out if these are best for my setup or if I should get some 2530s.

Also, I didn't get the banjo oil supply bolts with my turbos, do I need to run an oil restrictor such as the HKS 2530s uses in the bolts( http://www.hksusa.com/products/?id=694). I remember reading a post the subject with the HKS stuff and the resricted one was a huge difference in size compare to stock floating/sleeve bearing. A Nissan part number for those Nissan oil supply banjo bolts would be great if anyone has them.

http://www.turbobygarrett.com/turbobygarre...0R_707160_5.htm

http://www.turbobygarrett.com/turbobygarre...0R_707160_7.htm

http://www.skylinesaustralia.com/forums/in...281&hl=707160-7

FYI I am aimiing for ~600-650hp(500-550hp at the wheels) at the crank more important to me is not peak HP, but a broad useable powerband, I would like to get into autocrossing again, and messing around with drag racing occasionally. So quick boost is a good thing for autocross.

This is what I'll be running

1990 GTR

R33 Engine(newly built)

Wiseco pistons

Eagle rods

Tomei Poncams and Adj cam gears

Tomei 1mm hgasket kit with oil restrictors

Jun oil pump

N1 Water Pump

Greddy Intake Manifold

HKS style ex manifolds, dump pipes and collector

HKS hard pipes

HKS 3inch exhaust

HKS Twin Plate Clutch

Trust FMIC

Decat test pipe

BNR34 N1 turbos

PFC

Z32 AFMs

600-660cc FI

Apexi Air Filters

Electronic Boost controller

Nismo Fuel pump

Koyo Radiatior with electric fans

External Oil cooler

This is about what I'll be running after I do the rebuild. This is not my daily driver, more my weekend fun car :-)

Thanks in advance,

Tim

[paulr33]

n1's will be too small i think. if you wanted 2530s why did u just buy them the first time ?

[magmazin]

n1's will be too small i think. if you wanted 2530s why did u just buy them the first time ?

Well that's why I was asking if someone new what these would be rated at, on Garrets site they say the 707160-5 is good for 250-360hp each, if you make that times 2 turbos you get 500-720hp. Does that math work right? I figure even if I go conservative they should be good for 500-600hp and hopefully maintain efficiency. When I bought these the HKS 2530s(used) were going for around $2000US plus shipping, and I was able to get the BNR34 N1s(7-10K kms) that I had heard were very similar for $1300US delivered to my door. Also, I figured the R34 N1s would likely spool up faster and have better powerband in the midrange. But as I have no experience with either turbo setup I figure I would ask if someone has had experience with the 707160-5(or in my case 707160-4).

http://www.turbobygarrett.com/turbobygarre...0R_707160_5.htm