GT3071R Help

[Marti]

Boys and Girls.

Im running a gt3071r on my sr, im eeding some info from people who use these turbos, i would like to know,what power your making, what boost,whats the max hp they are rated for and what the torque and response is like.
im running the smaller rear housing and its on a 2.3l sr, but i would like just some general info from 2.0l sr's.

Thanks

[Saf]

Too many variables too say how and when its going to come on. This turbo will come on quite differently with OEM cams, and even 264's ... not to mention 272's, then mix in some timing and manifold setup etc etc. Is it a ported 4" compressor ?.

The 71 is a great turbo, ive used probably half a dozen , on 2L engines they come on anywhere from 3100 to 3700. Last one went on a RVR Mitsu, with a rather shitty china manifold (not my choice) and a worn inlet cam (hardening is worn down and lobe shape / lift is affected) at 22psi it makes 322awhp and moves out. With 264's it will really take off.

What kinda power you looking at getting ?. If your running a 2.3 and want some big power one day, not thought about the 76r ?

[Marti]

its ported running 276 cams in and ex, 6 boost manifold, i dont know im after torque and response not really power

[cplagz]

Like Saf said, it's hard to say with so many variables. The only way to work out the extent you can push the turbo is to take pressure reading pre and post turbine and compare them. If you are getting lots of backpressure pre turbine (in the manifold) the exhaust housing is restricting your output, if you get them post housing your dump/exhaust is restricting it (unlikely). If they are similar readings then keep winding the wick up.

[Saf]

its ported running 276 cams in and ex, 6 boost manifold, i dont know im after torque and response not really power

On that setup it will be a awesome mid sized turbo, very what you may call "all rounder" and will hit hard. It will bring a smile to your face for sure.

[Marti]

thats great to here, i have read on the link above full bost is at around 4500rpm, but thas on a 2l sr, what do you think it will be like on my 2.3l sr, should have more bottom end urge and come on boost a lot quicker ?

[Morgs]

We've got a 3076 on a pissy 2L, it'd have to be the pick for a 2.3 with a decent head job

[Marti]

yeah fair enough, head is fully built with 276 cams, 12.5mm lift, solid lifters, double valve ssprings, farerra 1mm over sized valves, adjustable timing gears, rocker arm stoppers and its been fully port and polished and re built

[Morgs]

Sounds pretty similar to this donk here, though 270 tomei 12.5mm, has plenty of powerband, 3500rpm odd through 8500rpm, I'll see if I can dig up a dyno sheet, though I think they're in storage with the car.

[Marti]

cool no worries are you running a 2l sr or a 2.3l stroker like im ?

[Marti]

cool no worries are you running a 2l sr or a 2.3l stroker like im ?

[180SXTCY]

marty who makes 276 duration cams?

[Marti]

i dont know i bought a set of hks cams from a guy over east, he said he had them ground or something thats all i know, best bet is look at the hks site im pretty sure they do some cams, or ask crow cams

[180SXTCY]

lol i dont want a set ive just never heard of 276 duration..but if they are custom ground that makes sense...

[Marti]

ok sorry, yeah i just wanted something big to push power up a little in the rev range,so i snapped them up ha ha

[Lonewolf]

hope they are billets and not regrinds!

[Marti]

billet of course, i wouldnt put re grinds in my car ha ha

[Saf]

Nothing wrong with re-grinds when they are welded and treated accordingly.

[Marti]

i guess but billet is nicer

[colt75]

i did post a turbo reference thing off ns.com
so it either got deleted or it didnt go through :S

[Saf]

I hear you. A billet is simply a raw casting, at times aftermarket that isnt even up to the spec of a OEM unit. Im not saying what your running isnt good, all im saying is that the re grind is a awesome option if done right and gets a bad rap from forums. I have 3 sets of cams for my CA motor ill be running for different setups ...

Even pro outfits like Web cam in USA, run many cams as OEM hardwelded re-grinds. You buy a new race cam for a Honda 450R .. oem hardweld regrind.

[Marti]

sounds good, can you post up that link please ?

[matt_2jzs13]

do you ever go on ns.com? its one of the most advertised pages on there

http://www.nissansilvia.com/forums/index.php?showtopic=192957

[datsqik]

There are quite a few variations of the 3071, both Garrett and HKS (gt2835)offer a 48,52 and 56 trim comp wheel with the 56 being the most popular, They also offer either a 2.75" or 4" inlet on the comp housing. There are 3 different turbine wheels used, the smallest the 84 trim which is also used on all the hks 2835's then the slightly bigger 90 trim then the larger 84 trim which is also used on the gt3076. There are also a few different ex housings used but in the t3 size they are mostly the gt30 style available in .63, .82 and 1.06 but i have seen some around with the t31 housings that have a smaller nozzle area which dont flow aswell as the gt30 style housing. In my opinion the smaller 84 trim turbine is better suited to the smaller 48/52 trim comp wheels when used with the t25 flanged housing and the 56 trim comp is better suited to the large 84 trim turbine and is ideally suited to the .63 a/r gt30 style ex housing. The max choke flow of the 56 trim comp wheel is around 47lbs/min which seems to also be about the max a .63 a/r gt30 housing will flow. Ive seen this combo used with a .82 a/r gt30 housing and things get a bit laggy. I reckon the 3071 with a 63 rear is probably the best allround turbo for the sr20 with fullboost around 4000 depending on lots of variables.

[juggernaut]

Something a bit different....i'm running a 3071 with ATP .78 twin scroll ex housing and full-race twin scroll ex manifold, 260/260 Tomei cams, headwork, hypertune intake - makes 26psi by 4000rpm (24psi in 36 degree ambient temps) and 290rwks at around 7700rpm from memory.

A member on NS was making around 315rwks with a 3071 with a .63 rear on a 2.2 stroker and full boost (?) by 3500rpm....he was upgrading to a 3076 last time I heard.

Depending on cams used, headwork, etc the 3071 will get you somewhere between 250rwks and 300rwks. The 3076 would be better for 300rwkw's +

Here's another nice 3071 dyno from NS.com - full boost by 3600rpm and 285rwks....nearly 200 rwks by 4000rpm.......from stock s15 motor with Camtech cams

http://i241.photobucket.com/albums/ff132/juggernaut000/3071Dyno.jpg

[Marti]

wow thats alot of info, but has helped and yes i do go on nissan silvia

[Lonewolf]

now thats a fat usable powerband

[joshg123]

Mine is very simmilar to yours juggernaut, obviously a bit less power than a sr but powerband is simmilar,

i have hks3037 with atp .78 twinscroll, 6boost and a fair whack of headwork

I hit about 20pound by 4kish and carry through to 7500

So far about 320whp has been recorded at all 4 at 1.5bar

[Marti]

.63 rear with 4inch inlet,thats all i know about it appart from its a gt3071r

[Milhouse]

ive got one on my 1.8 laser, whistles at 2000rpm and starts to pull around the 4000rpm mark

Full boost comes on quite quick once its spinning haha.

.63 rear with 4inch inlet and anti surge cover