GT2871 USERS. SR motor

[Silvi]

Will post dyno results when I'll get it.
Replaced my 2876.86 with GT2871.64 - same power output,lower boost,better response and surprisingly a great high end

[derass]

Originally Posted by Silvi

S15 stock camshafts
Gt2871.64
External wastegate
Tubular exhaust manifold
Greddy intake manifold
VR6 throttle body
780 cc injectors

1.2 bar boost - 400whp (gearbox limit)

Have you upgraded the headgasket and switched to studs at that boost level?

Edit: 1.2 bar is only 17.4 psi. Very impressive numbers for that boost pressure.

[S13alldayyo]

I'm on 20 psi of boost on stock HG and studs no problems so far gt2871


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[Kingtal0n]

Originally Posted by fullthrottle

I dont think thats enough boost to make 400whp with stock cams. Atleast Ive never seen it done before. Its very very difficult to hit 400whp with the .64

right. Stock cam/mostly stock engine pump gas limit is around 320rwhp.

WHen we post dyno numbers, we have to post dynojet numbers, or at least say what dyno was used. Dynojet is an easy standard. That S15 engine on a dynojet would show 315rwhp IMO.

[Silvi]

The fuel pump isn't stock. Im using walbro pump, Apexi head gasket and ARP head studs.

The car was tuned on Dynapack dyno

[sentrafan57]

the 240z and 300z are sweet rides. 200sx nice, I own a 96 sentra tinker toy 1.6 5sd, computer bad not pulsating injectors. I wish to upgrade performance since I have to change it anyhow. any information would be much appreciated. pics are to come soon.

[Kingtal0n]

Originally Posted by Silvi

The fuel pump isn't stock. Im using walbro pump, Apexi head gasket and ARP head studs.

The car was tuned on Dynapack dyno

pump gas means 93 octane or around that. Fuel pumps do not add horsepower. neither do head gaskets or ARP head studs.

[TomBec]

blacktop, gt2871r .64, freddy mani, 750cc, walbro, aem ems v2, arp studs, cosworth gasket.. boost by gear 12, 18, 18, 18, 12.. numbers are in my sig.. dynojet. ill scan the sheet if i head out to the garage tonight.

[S13alldayyo]

I made 330 at 14 psi

You need cams
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[Silvi]

I never said that fuel pump added some HP...just confused with your post..
About the gasket and the studs, I was answered the previous question

And yes 93 octane

[Silvi]

Boost/Power output graph

[S13alldayyo]

Hey guys quick question with my 2871r im getting full boost at 4400rpm (20psi) what rpm do you guys get full boost 18-20 psi only not people with 15 psi or less


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[jaysgottaredtop]

^ .64 or .86?

My 2871r .64 hits 20psi around 4100 or so

[S13alldayyo]

Do you have a stock intake manifold or greddy style? I hit 20 psi at 4400 on 3rd gear


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[S13alldayyo]

Sorry .64


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[cotbu]

Originally Posted by S13alldayyo

Sorry .64


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Try editing your post?!

You have to have some sort of starting point or guide.
Usually rpm, and gear for dyno, and street. maybe even speed and vacuum
gt2871r.64 56trim t04e 50ar compressor housing
3rd gear street 2500rpm 0 vacuum full boost 20psi 3400rpm
4th gear street 2500rpm 500mmhg full boost 20psi 3500rpm
4th gear dyno 2000rpm full boost 20psi 3200rpm
None of the street pulls were full throttle btw.
There are factors that can affect spool, pros and cons.
I also tune by the 300ftlbs for 3000rpm rule!

[S13alldayyo]

On the street in 3rd im getting 20 psi when I touch 4400rpm this is at full throttle, tial wastegate 8psi spring and I have my MEGASQUIRT ecu controlling boost I have set boost duty at max 100% and the best I can get was that. How are you getting full boost by 3500 that is a extremely big difference

Also do you have an upgrade plenum or stock

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[cotbu]

Stock s13sr intake, stock exhaust manifold with Tial v44 gate 1bar spring, blitz dual sbc, I don't remember the gain or duty, I set it over 2 years ago.

I have a question for you. Does your setup sweep past 0 when coming from vacuum into boost or does it take a slight pause?

And does your turbo spin during idle, and shut down?

Sent from a Highly Tuned Note 4.5!!!

[S13alldayyo]

Sorry about the delay, it doesn't sweep past 0 I also boost leak test and fixed all leaks, the turbo is spinning on idle I put a harder spring in the wastegate and set my boost controller to the max and all I could get was full boost at 4000-4100

Turbo is brand new
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[cotbu]

There's probably things you can do, like make sure your bov is not leaking.
Also I make full boost within 1000rpm so if your in 3rd at 3000rpm and you reach 20psi at 4000rpm I'd say that's normal. You could also try tuning for max best torque, vs horse power. if using a brake dyno you will most definitely see an increase in spool on the street.

Sent from a Highly Tuned Note 4.5!!!

[5280VertDET]

Originally Posted by tabasco122

I need pics of your intake setups on the 3" 2871, I'm having issues with mine on the stock mani. It hits the ps setup...

Originally Posted by s15specR

I went with the 56 trim, breaking in engine right now, so tune and dyno will follow shortly, what trim do you suggest or had the most success with ?

Originally Posted by Ninjabread

ya, I suppose, and its not THAT hard to make the t04s fit, really its a coupler for hte intake pipe, and a 90* reducing coupler, thats it...

Originally Posted by s15specR

mine fit well, I used a 45deg reducer instead of a 90 though.

I searched this pretty thoroughly and have yet to see a good solution for the 3" universal 2871 and z32 MAF.




I had a APEXi Super Suction, but it does not fit with 45* reducer (hits the HP PS line and the Res Return line BEFORE it even has the MAF on it.). Trimmed the coupler, tried tucking up the ISIS hot pipe pointing forward towards the radiator; nothing. I have given up on my super suction . (Besides the "nipples on the pipe hit almost everything the main pipe missed)



So, what are people's solutions? Something with a vacuum line for the catch can and a port for the BOV Recirc.

Please post your pictures if you have them!

[KoukiMonsta]

Originally Posted by 5280VertDET

Something with a vacuum line for the catch can and a nipple for the BOV.

I am in a similar position, just cant seem to sort out proper routing w/ 90* bend and distance between MAF and turbine..space is limited w/ increase wheel tub size.

Side note, BOV needs to see vac and boost - meaning it needs to be plumbed to IM.

[5280VertDET]

Originally Posted by KoukiMonsta

Side note, BOV needs to see vac and boost - meaning it needs to be plumbed to IM.

Thanks, edited it. Meant a port to recirc the BOV.

[silverarrow27]

Pipingpro.com use to have an intake kit available for the GT2871R. Not sure if they're still around, I remember they use to be on Zilvia offering up custom intakes like 7-8 yrs ago.

[S13alldayyo]

You need a 3" 90 degree bend, that's what I used


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[5280VertDET]

Originally Posted by silverarrow27

Pipingpro.com use to have an intake kit available for the GT2871R. Not sure if they're still around, I remember they use to be on Zilvia offering up custom intakes like 7-8 yrs ago.

Found that, sites dead, the last time he was on here was 2011.

Originally Posted by S13alldayyo

You need a 3" 90 degree bend, that's what I used

Starting to realize that.

I know, I know, but has anyone used this thing?



http://www.amazon.com/Spectre-Perfor.../dp/B000BPUTO6


It's just about the only DIY option, besides the ducting tubes...

[ultimateirving]

I get that it's on the intake side, but I was melting specter couplers when they were right before the intercooler. I can't imagine this one holding up connected to the turbo near the manifold.

Originally Posted by 5280VertDET

Found that, sites dead, the last time he was on here was 2011.




Starting to realize that.

I know, I know, but has anyone used this thing?



http://www.amazon.com/Spectre-Perfor.../dp/B000BPUTO6


It's just about the only DIY option, besides the ducting tubes...

[KiNg MaRtY]

What is the maximum boost you are able to reach and hold with the internal wastegate?

[TheRealSy90]

Originally Posted by KiNg MaRtY

What is the maximum boost you are able to reach and hold with the internal wastegate?

Probably as much as you want if you crank down the preload tight enough or add additional springs. I know of an evo in Phoenix running an internal gate on like 45psi because he has a bunch of extra springs holding the flap closed in addition to the actuator.

[KiNg MaRtY]

How about with an unmoded wastegate?