GT2871 USERS. SR motor

[rotation3x]

Im getting my motor back in my car this weekend or next weekend. I got the gt2871r .64 and I was kinda wondering what to expect from it with stock cams and manifolds. Eventually I plan to get the BC 264's since it will be street driven.

Anyone know what the stock setting is on the 2871's wastegate actuator and how much boost it can handle?

[serturbo]

Isn't it set to 1 bar? I'll know for sure when I get my engine installed. I've seen people mention that the max psi is about 18-21.

[Steeles]

I've had problems with my .86 spiking. trying to get it to hold 20psi it wants to shoot to 25 and bounce. (boost cut on the standalone is set to 22 now and I haven't messed with it in a few days due to other issues with the car) But I know ((SR)) Kelly was having a similar issue with that boost level. I'm starting to wonder if the internal wastegate isn't up to holding that.

bottom mount T25 flanged internal wastegate. HKS adjustable wastegate actuator set to 10psi.

I hit 345hp (stock cams, on a dynojet) with it spiking like that.

[DrifterProdigy85]

I run Tomei 270 Solid Cams on my 2871R .86 setup. There really not that bad. You can feel the difference when the turbo hits full boost to when you hit peak tq though. Hits around 20psi on the street below 4500rpm and tq feels the hardest around 5500rpm. Power feels like it comes on smoother than it used to with the 264 cams. Less wheel spin going from a 2nd gear roll but if you clutch kick, the tires spin like crazy. I should dyno this setup before i stick my GT3567R setup on. I raced a new M5 on the highway last weekend and I pulled around 6 car lengths from 60mph to 120mph. Guy was pretty surprised. My setup is pretty close to Brian W. except i have a P&P Head, Valve Job, and Ichiba Vers. II Exh. Mani.

[steve shadows]

Originally Posted by DrifterProdigy85

I run Tomei 270 Solid Cams on my 2871R .86 setup. There really not that bad. You can feel the difference when the turbo hits full boost to when you hit peak tq though. Hits around 20psi on the street below 4500rpm and tq feels the hardest around 5500rpm. Power feels like it comes on smoother than it used to with the 264 cams. Less wheel spin going from a 2nd gear roll but if you clutch kick, the tires spin like crazy. I should dyno this setup before i stick my GT3567R setup on. I raced a new M5 on the highway last weekend and I pulled around 6 car lengths from 60mph to 120mph. Guy was pretty surprised. My setup is pretty close to Brian W. except i have a P&P Head, Valve Job, and Ichiba Vers. II Exh. Mani.

Im not a really big fan of the .86 on stock displacement for this reason.

Peak torque for a lot of t3/t4 cars Ive tuned comes on before this even with high duration cams (like 272).

But personally I feel the benefit of having a bottom mount with a T28 trim family wheel is to have it very fast spooling and torque building-style of power band.

I would wager that a properly tuned GT3071R with .63 housing will poop all over the .86 housing 2871R.

note exibit A



car made about 375 whp on a dynojet , but just note the point where the curve builds to peak torque.

and compare it to most .86 graphs, this is also a GT3076R which is even larger and mis-matched wheels on the CHRA

[rotation3x]

At what boost level does the stock 370cc injectors and maf max out with the 2871r .64?

[OBEEWON]

I wouldn't run more than 12-14 psi on stock injectors. But thats just me.

Dumping 740's and going with Sard 850's, so you can buy mine if you want.

[Steeles]

theresa a thread on fresh alloy in the basic section on running the GT2871r one stock stuff. general consensus. don't bother. get your fuel and ignition fuel control set up first. unless your turbo is absolutely dead.

[INeedNewTires]

here's my setup

S14 SR
Crower rods
Weisco forged pistons bored .020 over.
HKS cams 264's
rebuilt head
GT2871R .64
stock intake and exhaust manifold
Hybrid IC
Apexi intake
Z32 MAF
740cc injectors
walbro 255 fuel pump
Apexi 3 in exhaust
Greddy elbow and down pipe
megan test pipe
Tuned with Apexi power FC

So at 1.3 BAR she made 363 whp and 353 tq w/ 93 octane

What do you guys think? I was hoping for at least 380, maby closer to 400.



Also wierd dip around 5k huh? any idea's on this?

[steve shadows]

what is the boost data logging in that dip?

What is boost doing there? check if boost is dipping.

If it's not it's a bad tune. Seems kind of choppy anyways

also is that an .86 Housing? seems very fast spooling

[INeedNewTires]

i edited, its .64.... dont know what the boost is doin i'll have to check with the guy who tuned it... Also just realized it was tuned with a gutted cat not the test pipe i installed afterwards... if that makes a difference (minimal i'm sure)

[steve shadows]

Originally Posted by INeedNewTires

i edited, its .64.... dont know what the boost is doin i'll have to check with the guy who tuned it... Also just realized it was tuned with a gutted cat not the test pipe i installed afterwards... if that makes a difference (minimal i'm sure)

That's not your problem. (gutted cat)

The problem is bad tuning (timing map) Like he did not adjust where VTC came on (if you still have it operating on the motor)

or boost is bleeding off and then coming back, Im havinga similar problem right now with an external wg, the solenoid didnt have enough start duty so it would overcorrected when peak boost came on in mid-range

You tuner should have a data file of the run where youguys logged boost over RPM.

should...at least

[INeedNewTires]

yea i just meant a difference in some of the power... i know that has nothing to do with the dip.

Every now and then it'll over boost and it cuts itself out, esp when its cold outside. I have a dual stage MBC that has a lil solenoid switch, i've got it set for 1 bar and 1.3 bars hi/lo

I'll check with the tuner if he has the boost data but doubt it, its been almost a year and well, i just dont know.... Sure wish there was a good nissan tuner in dallas tx... anyone know of a good one?

[steve shadows]

Not off the top of my head. Texas has a lot of good tuners, so does Florida and Virginian/ PA

I would junk the manual boost controller, they are trash for effectivey controlling smaller bottom mount turbos with internal wastgates.

I would get the PFC boost solenoid and use that in conjunction with the PFC unit. In my experience this seems to be the best closed loop bc to manage those smaller turbos.

[xxchurroxx]

377 HP and 320 ft/lbs of torque at 18 psi

s14 SR
V-mounted IC/rad w/ dual FAL fans
larger s13 throttle body
stock intake and exhaust manifolds
stock bottom end w/ no head work done
GT2871r .64
BC 264 in/exh cams
BC spring and titanium retainers
z32 maf
Apex'i PFC L-Jetro
exedy stage 2
fidanza flywheel
Deatschwerks 600c injectors
CS flat DP/elbow
Apex GT Spec with JDM 3" gutted cat

FYI, exedy Stage 2 clutches slip @ 320 ft-lbs of torque...hence the flatter torque curve.

[steve shadows]

^ Nice Torque curve!

[McRussellPants]

Originally Posted by xxchurroxx

FYI, exedy Stage 2 clutches slip @ 320 ft-lbs of torque...hence the flatter torque curve.

uh oh.

I was hoping it would last at least a month or so.

[KiDyNomiTe]

Originally Posted by xxchurroxx

377 HP and 320 ft/lbs of torque at 18 psi

s14 SR
V-mounted IC/rad w/ dual FAL fans
larger s13 throttle body
stock intake and exhaust manifolds
stock bottom end w/ no head work done
GT2871r .64
BC 264 in/exh cams
BC spring and titanium retainers
z32 maf
Apex'i PFC L-Jetro
exedy stage 2
fidanza flywheel
Deatschwerks 600c injectors
CS flat DP/elbow
Apex GT Spec with JDM 3" gutted cat

FYI, exedy Stage 2 clutches slip @ 320 ft-lbs of torque...hence the flatter torque curve.

I am hoping to hit 400 at about 20 pounds, similar setup, just haltech/map sensored and 850cc injectors. Hopefully this should be tuned by the end of the month.

[Steeles]

Steve, have you seen any issues with the stock internal wastegates not holding 20psi? mine seems to flutter between 20-25 when I try and set the HKS EVC. 15 holds fine. actuator is set at 10. alot of this has me wanting to get the .64 housing and swap out. (i was supposed to be getting a .64 when i bought mine. got an .86 instead)

[steve shadows]

EVC?

I think the greddy Profec B and the PFC are the best in my experience in controlling the boost spike or drop off.

other than that you can try porting the wg door hole a little bit and like you said pre-loading your adjustable wg.

[Steeles]

Originally Posted by steve shadows

EVC?

I think the greddy Profec B and the PFC are the best in my experience in controlling the boost spike or drop off.

other than that you can try porting the wg door hole a little bit and like you said pre-loading your adjustable wg.

Yeah HKS evc V. like I said It's not having problems untill I try and set it in the 18-20psi range which was making me think that the internal wastegate was the problem. I may try preloading the wastegate actuator a little more and see what it does.

[codyace]

Originally Posted by Steeles

Steve, have you seen any issues with the stock internal wastegates not holding 20psi? mine seems to flutter between 20-25 when I try and set the HKS EVC. 15 holds fine. actuator is set at 10. alot of this has me wanting to get the .64 housing and swap out. (i was supposed to be getting a .64 when i bought mine. got an .86 instead)

From first hand experience with two different boost controllers, different sources (boost) and different wastegates, there really is no reliable way to hold under 15 psi and then 20 psi on the highside.

I've preloaded, un preloaded, done everything in the book.

The solution (hopfully) is getting the external gate provision on my stock manifold (thanks to Enthalpy himself).

Originally Posted by INeedNewTires

here's my setup
S14 SR
Crower rods
Weisco forged pistons bored .020 over.
HKS cams 264's
rebuilt head
GT2871R .64
stock intake and exhaust manifold
Hybrid IC
Apexi intake
Z32 MAF
740cc injectors
walbro 255 fuel pump
Apexi 3 in exhaust
Greddy elbow and down pipe
megan test pipe
Tuned with Apexi power FC
So at 1.3 BAR she made 363 whp and 353 tq w/ 93 octane

Get the stock exhaust manifold extrude honed and coated, get a Greddy Intake Manifold, and get a retune

Not sure if the I/C is hurting any or not either...i'm not an intercooler master by any stretch....

[Steeles]

Originally Posted by codyace

From first hand experience with two different boost controllers, different sources (boost) and different wastegates, there really is no reliable way to hold under 15 psi and then 20 psi on the highside.

I've preloaded, un preloaded, done everything in the book.

The solution (hopfully) is getting the external gate provision on my stock manifold (thanks to Enthalpy himself).

hmm thats what I was worried about. not that I mind running 15psi as the base but I figured theres two settings might as well use them. but I'll try bumping the base up to 15 and see if it'll hold. If I go external I'd rather go top mount and get the T3 housing for the turbo.

[DrifterProdigy85]

I agree that the 3071R .63 will spool faster and make more power than the 2871R .86. I think the .86 housing is just restrictive. Ive always been curious of the GT2871R w/ .63 T3 housing. Might give the same top end power of the .86 with the spool that it lacks.

370cc can max out with only 10psi pending on the setup. When i dynoed my stock block w/ 2871R .86, Greddy IM, and HKS 264 Step 1 Cams, I was doing 315whp @ 14-15psi.

INeedNewTires, i believe you can hit your 400hp goal if you get a new Intake Manifold and some kind of Tubular Manifold. I like my Ichiba Vers II Manifold. Same design as the Tomei but half the price.

[Steeles]

true, I've got my stocker in a box somewhere. may see about having a wastegate port added to it and coat it like yours is. ah well. other fish to fry on the current setup to handle first. like getting my timing dialed in lol

[rotation3x]

What fitting do you guys use for your circuit sports oil line. I know it needs a restrictor fitting (which came threaded in my turbo) but will not thread onto my new line. The circuit sport line came with a fitting that threads into the turbo and line but dosn't have the restrictor.

[codyace]

/\ I have no clue. I bought the TAKA kit and restrictor.

[Steeles]

+1 they've been on my car longer than the Turbo!

[rotation3x]

Can someone that has a gt2871r .64 tell me the numbers on your wastegate actuator? (there is a little sticker on it) I bought one from jgycustoms and my receipt says for fwd gti-r. I just want to make sure its right.

[s13envy]

what hp would you rate a basically full interior s13 trapping 128? lol