GT2871 USERS. SR motor - Page 124 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

KiNg MaRtY · 08-05-2015, 05:54 PM

I have a HKS GT2530 with a .86 turbine housing that had bearing failure. I plan to convert to a GT2871. There is a shop that claims they may even be able to machine it out to convert it to a 3071 or perhaps even a 3076.

I am doing my research on here as this is a very popular turbo in the SR20 community and not in the 4G63 community. This is for my 92 Galant VR-4 or I may put it in my Miata but would go with a 2871 for sure if it does go into the Miata.

Dboyizmlg · 08-06-2015, 08:16 PM

Tuned my Sr20 today at Autotalent, in Carson CA.

Sr20det
-bone stock bottom end
-stock Headgasket
-stock headbolts
-stock valve springs
-Stock intake manifold, and exhaust manifold

-3in exhaust, with catback
-tomei 256 poncams
-gt2871r .64
-tomei 740cc injectors
-tomei FPR @3.5 bar
-Apexi PFC
-Aem E85 fuel pump
-E85 fuel

368whp @17psi

Intake manifold is choking out at around 6,200rpm. A nice Freddy would help out and make it breath better though.

Compliments of Koji Arai for tuning this Sr with stock HG, and bolts.

cotbu · 08-06-2015, 08:44 PM

That's with e85? it's right on point with the average pump gas though. 17psi ruff tuned makes 350hp. What is the torque?
34~ or 36~?

Sent from a Highly Tuned Note 4.5!!!

Dboyizmlg · 08-06-2015, 09:11 PM

Quote:

Originally Posted by cotbu

That's with e85? it's right on point with the average pump gas though. 17psi ruff tuned makes 350hp. What is the torque?
34~ or 36~?

Sent from a Highly Tuned Note 4.5!!!

Tq is 339, only 1 shy of 340, lol.

Injectors are at 96% duty....( I know)

If I had bigger injectors, and a Freddy intake manifold I'm sure it should be another 15-20whp more, at the same boost level. Also, with it breathing more air after 6,300rpm.

Peak power (368whp) is at 6,200. After that it starts to slowly take a dive, this is where the Freddy intake comes to play.

TheRealSy90 · 08-08-2015, 02:32 PM

Why not run the FPR at 4 bar to let up on a bit of duty cycle?

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Dboyizmlg · 08-08-2015, 03:40 PM

Quote:

Originally Posted by TheRealSy90

Why not run the FPR at 4 bar to let up on a bit of duty cycle?

Sent from my iPhone using Tapatalk

Main reason I don't turn up to 4 bar, is because I only have one in tank fuel pump(Aem 340plh).

Running it at 4 bar with one fuel pump is going to shorten the life of the pump drastically.
People that run 4 bar usually have 2 fuel pumps.

TheRealSy90 · 08-08-2015, 03:44 PM

I figured either way the pump is pumping the same amount of fuel.

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Dboyizmlg · 08-08-2015, 04:03 PM

Btw, I got a bit of info on the water/meth injection tuning with PFC.
Koji has tuned a lot of water/meth With 91 pump.

He says it really simple, the only time meth is injected is when it's in boost.
He doesn't like it as much though.
The reason why, is because some times the meth injection nozzle gets clogged, and then the proper amount of meth is not being injected this causing the motor go boom.

Also he stated that when tuning it, when there is a wot pull the first 2 seconds there is a big Jump in knock, then as the meth kicks in, it lowers the knock back down to safe level.

Besides that, he is ok with it. Just recommends to replace nozzle tip once a year.

TheRealSy90 · 08-09-2015, 02:36 AM

Koji is super experienced with PowerFC tuning. He was my tuner of choice until I decided to change to an AEM Ems.

5280VertDET · 08-09-2015, 09:11 AM

BUMP again,

Any pictures of the universal 2871 and a intake pipes with a MAF?

Dboyizmlg · 08-09-2015, 09:30 AM

Quote:

Originally Posted by TheRealSy90

Koji is super experienced with PowerFC tuning. He was my tuner of choice until I decided to change to an AEM Ems.

He can also tune AEM EMS, and is really familiar with that standalone as well.
Hit him up for info!

Bleakley · 08-09-2015, 10:31 AM

So why don't people like the new GTX2871R? Same packaging with an updated/improved compressor wheel resulting in a little more power? Seems like the ultimate/top out choice for a T2 bottom mount...
Details please. I won't be purchasing for a long time, but trying to decide between gtx2871r or gtx3076r

s13drob · 08-09-2015, 10:57 AM

S13 Sr20det
91 pump
18psi boost
Power FC Djetro
Gtx2867r .64 external gate
VQ coilpacks
Stock ex mani w/Tial WG
Tial bov vta
Tomei 256 poncams
Supertech valve springs/retainers
Apexi HG with ARP studs
CP pistons 86.5 w/ 8.5 comp
Stock rods w/ ARP bolts
Nismo fuel pressure regulator
Walbro 255
3" exhaust

Tuned by Koji as well. I've been wanting some advice on my setup and since Koji is being mentioned. Given that it's a GTX turbo. People aren't mentioning much on their fuel choice but it seems like everyone is using higher than 91 for the numbers their getting. It seems like I need e85 to get more boost.

derass · 08-09-2015, 12:07 PM

Quote:

Originally Posted by 5280VertDET

BUMP again,

Any pictures of the universal 2871 and a intake pipes with a MAF?

I have some pics on my other computer, I will post them when I get a chance. You need a 45* coupler at the inlet, a section of pipe with a 45* bend IIRC, add ports for breather and recirc, then another coupler at the MAF.

e1_griego · 08-09-2015, 12:45 PM

^This is what I did for both my GTX setups. Actually I ran a 90* coupler and 3" piping for one of them as it packaged better that way.

Dboyizmlg · 08-09-2015, 02:25 PM

Quote:

Originally Posted by s13drob

S13 Sr20det
91 pump
18psi boost
Power FC Djetro
Gtx2867r .64 external gate
VQ coilpacks
Stock ex mani w/Tial WG
Tial bov vta
Tomei 256 poncams
Supertech valve springs/retainers
Apexi HG with ARP studs
CP pistons 86.5 w/ 8.5 comp
Stock rods w/ ARP bolts
Nismo fuel pressure regulator
Walbro 255
3" exhaust

Tuned by Koji as well. I've been wanting some advice on my setup and since Koji is being mentioned. Given that it's a GTX turbo. People aren't mentioning much on their fuel choice but it seems like everyone is using higher than 91 for the numbers their getting. It seems like I need e85 to get more boost.

You also have stock intake manifold...? looks like it starts to choke at 6,400 rpm.

I highly suggest a Freddy intake so it wont drop at high rpm.

E85 fuel will be your best friend! For safety reasons, and to achieve more power!!! You should retune on E85 and turn the boost up to 22psi.
You could be at 400whp. Talk to Koji, he will be super glad you are tuning with E85.

5280VertDET · 08-09-2015, 08:14 PM

Quote:

Originally Posted by derass

I have some pics on my other computer, I will post them when I get a chance. You need a 45* coupler at the inlet, a section of pipe with a 45* bend IIRC, add ports for breather and recirc, then another coupler at the MAF.

Thank you, that would be VERY helpful.

I have the 45*, but it's tight.

Quote:

Originally Posted by e1_griego

^This is what I did for both my GTX setups. Actually I ran a 90* coupler and 3" piping for one of them as it packaged better that way.

This may be the other choice tomorrow.

I am pulling my hair out with this shit.

S13alldayyo · 08-09-2015, 08:25 PM

Your not going to reach 400 with 750cc injectors, my 1000cc are like 90% on e85 on 20 psi but that's stock base fuel pressure

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e1_griego · 08-09-2015, 08:31 PM

Quote:

Originally Posted by 5280VertDET

Thank you, that would be VERY helpful.

I have the 45*, but it's tight.

This may be the other choice tomorrow.

I am pulling my hair out with this shit.

I bought one of these: http://www.mandrel-bends.com/catalog...-bend-608.html and then a buddy cut and welded it for me. Welded on bungs for bov recirc and for a catch can line and that's it.

Bleakley · 08-09-2015, 08:57 PM

Quote:

Originally Posted by S13alldayyo

Your not going to reach 400 with 750cc injectors, my 1000cc are like 90% on e85 on 20 psi but that's stock base fuel pressure

Sent from my iPhone using Tapatalk

I stand corrected, no knowledge of E85.

Dboyizmlg · 08-09-2015, 09:51 PM

Quote:

Originally Posted by Bleakley

Bullshit, multiple documented cases of 740cc's pushing 400 wheel. If I have to search and edit this post to provide the links I will..

No, not on E85 fuel!

Pump gas, yes

S13alldayyo · 08-09-2015, 10:03 PM

E85 bro e85

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Bleakley · 08-09-2015, 11:23 PM

My bad, no knowledge of E-85. I'm surprised you can't. You can push 450-500+ on 93 with Nismo/Tomei/HKS 740's. Surprised you can't hit four hundo on the corn...

S13alldayyo · 08-10-2015, 12:08 AM

Remember, e85 is 25-30% more fuel through out the entire map, from idle to redline

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s13drob · 08-10-2015, 10:10 AM

Quote:

Originally Posted by Dboyizmlg

You also have stock intake manifold...? looks like it starts to choke at 6,400 rpm.

I highly suggest a Freddy intake so it wont drop at high rpm.

E85 fuel will be your best friend! For safety reasons, and to achieve more power!!! You should retune on E85 and turn the boost up to 22psi.
You could be at 400whp. Talk to Koji, he will be super glad you are tuning with E85.

Yea Koji suggested that I need e85 and Id1000s. He gave me quite a bit of knowledge and continues to. When I got the car back and it was only 337 I was a little dissapointed until I realized most people are running 93 or e85 and get more power.

Yea I'm running the stock intake manifold but I didn't hear much about choking on other setups. I'll get a Freddy intake to fix that.

S13alldayyo · 08-10-2015, 10:14 AM

There is a calculater on one of the injector websites I forgot Wich one and it calculates what size injector you would need for what size engine for what power goals so you get the right equipment the first time

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Dboyizmlg · 08-10-2015, 11:22 AM

Quote:

Originally Posted by s13drob

Yea Koji suggested that I need e85 and Id1000s. He gave me quite a bit of knowledge and continues to. When I got the car back and it was only 337 I was a little dissapointed until I realized most people are running 93 or e85 and get more power.

Yea I'm running the stock intake manifold but I didn't hear much about choking on other setups. I'll get a Freddy intake to fix that.

When I say choking, I mean power starts to drop off after peak power is achieved. On your graph it looks like it starts to drop at 6,400rpm.
If you would have an upgraded intake manifold, it would create more power, in addition it would stay solid till redline.

Your 337whp is on point for 91 octane, as you know Koji tunes very conservative.

Id 1,000cc will max out around 430whp on your sr20, when tuned on E85.

slider2828 · 08-10-2015, 12:23 PM

Its probably the poncams too that is choking it a little. Fun on the street though I bet...

s13drob · 08-10-2015, 06:17 PM

Quote:

Originally Posted by Dboyizmlg

When I say choking, I mean power starts to drop off after peak power is achieved. On your graph it looks like it starts to drop at 6,400rpm.
If you would have an upgraded intake manifold, it would create more power, in addition it would stay solid till redline.

Your 337whp is on point for 91 octane, as you know Koji tunes very conservative.

Id 1,000cc will max out around 430whp on your sr20, when tuned on E85.

Yea i understand. I assumed it was more of the pon cams causing the drop off more than the intake manifold. Thanks for the advice.

So how does my gtx dyno graph compare to a 2871r on 91 at around the same boost? I've searched through a few pages and it looks like my torque/rpm levels are lower. I'm not sure if they were on e85.

s13drob · 08-10-2015, 06:18 PM

Quote:

Originally Posted by slider2828

Its probably the poncams too that is choking it a little. Fun on the street though I bet...

Yea it is pretty fun. I can't wait for a decent tire setup to get much needed traction.

08-05-2015, 05:54 PM	#3691
KiNg MaRtY Join Date: Jan 2014 Location: Corona, CA Age: 40 Posts: 4 Trader Rating: (0) Feedback Score: 0 reviews	I have a HKS GT2530 with a .86 turbine housing that had bearing failure. I plan to convert to a GT2871. There is a shop that claims they may even be able to machine it out to convert it to a 3071 or perhaps even a 3076. I am doing my research on here as this is a very popular turbo in the SR20 community and not in the 4G63 community. This is for my 92 Galant VR-4 or I may put it in my Miata but would go with a 2871 for sure if it does go into the Miata. __________________ 92 Galant VR4 - E3 16g, KW V3 / 94 Miata / 2006 Evo IX - 417 HP 418 TQ

08-06-2015, 08:16 PM	#3692
Dboyizmlg Nissanaholic! Join Date: Aug 2011 Location: SoCal (I.E.), San Berdino, Colton, Redlands Posts: 1,675 Trader Rating: (18) Feedback Score: 18 reviews	Tuned my Sr20 today at Autotalent, in Carson CA. Sr20det -bone stock bottom end -stock Headgasket -stock headbolts -stock valve springs -Stock intake manifold, and exhaust manifold -3in exhaust, with catback -tomei 256 poncams -gt2871r .64 -tomei 740cc injectors -tomei FPR @3.5 bar -Apexi PFC -Aem E85 fuel pump -E85 fuel 368whp @17psi Intake manifold is choking out at around 6,200rpm. A nice Freddy would help out and make it breath better though. Compliments of Koji Arai for tuning this Sr with stock HG, and bolts. Last edited by Dboyizmlg; 08-07-2015 at 11:17 AM..

08-06-2015, 08:44 PM	#3693
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 49 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	That's with e85? it's right on point with the average pump gas though. 17psi ruff tuned makes 350hp. What is the torque? 34~ or 36~? Sent from a Highly Tuned Note 4.5!!! __________________ LoverTechnologies "Half Broken Things!"

08-09-2015, 09:11 AM	#3700
5280VertDET Nissanaholic! Join Date: Aug 2013 Location: Denver Age: 40 Posts: 2,052 Trader Rating: (14) Feedback Score: 14 reviews	BUMP again, Any pictures of the universal 2871 and a intake pipes with a MAF? __________________ S13 Vert \| SR \| PE1420 \| 5-Speed \| 15x9.5 - 0 \|

08-10-2015, 12:23 PM	#3718
slider2828 Post Whore! Join Date: Oct 2004 Location: San Francisco, CA Posts: 5,998 Trader Rating: (13) Feedback Score: 13 reviews	Its probably the poncams too that is choking it a little. Fun on the street though I bet... __________________ Turn and Burn!

08-08-2015, 04:03 PM	#3698
Dboyizmlg Nissanaholic! Join Date: Aug 2011 Location: SoCal (I.E.), San Berdino, Colton, Redlands Posts: 1,675 Trader Rating: (18) Feedback Score: 18 reviews	Btw, I got a bit of info on the water/meth injection tuning with PFC. Koji has tuned a lot of water/meth With 91 pump. He says it really simple, the only time meth is injected is when it's in boost. He doesn't like it as much though. The reason why, is because some times the meth injection nozzle gets clogged, and then the proper amount of meth is not being injected this causing the motor go boom. Also he stated that when tuning it, when there is a wot pull the first 2 seconds there is a big Jump in knock, then as the meth kicks in, it lowers the knock back down to safe level. Besides that, he is ok with it. Just recommends to replace nozzle tip once a year.

08-09-2015, 10:31 AM	#3702
Bleakley Zilvia Addict Join Date: Apr 2011 Location: Near Pittsburgh, PA Posts: 637 Trader Rating: (1) Feedback Score: 1 reviews	So why don't people like the new GTX2871R? Same packaging with an updated/improved compressor wheel resulting in a little more power? Seems like the ultimate/top out choice for a T2 bottom mount... Details please. I won't be purchasing for a long time, but trying to decide between gtx2871r or gtx3076r

08-09-2015, 10:57 AM	#3703
s13drob Zilvia Addict Join Date: Jan 2008 Location: socal Posts: 774 Trader Rating: (29) Feedback Score: 29 reviews	S13 Sr20det 91 pump 18psi boost Power FC Djetro Gtx2867r .64 external gate VQ coilpacks Stock ex mani w/Tial WG Tial bov vta Tomei 256 poncams Supertech valve springs/retainers Apexi HG with ARP studs CP pistons 86.5 w/ 8.5 comp Stock rods w/ ARP bolts Nismo fuel pressure regulator Walbro 255 3" exhaust Tuned by Koji as well. I've been wanting some advice on my setup and since Koji is being mentioned. Given that it's a GTX turbo. People aren't mentioning much on their fuel choice but it seems like everyone is using higher than 91 for the numbers their getting. It seems like I need e85 to get more boost.

08-09-2015, 12:45 PM	#3705
e1_griego Post Whore! Join Date: Sep 2004 Location: Independence, Ore. Age: 39 Posts: 2,715 Trader Rating: (24) Feedback Score: 24 reviews	^This is what I did for both my GTX setups. Actually I ran a 90* coupler and 3" piping for one of them as it packaged better that way.

08-09-2015, 08:25 PM	#3708
S13alldayyo Zilvia Addict Join Date: Mar 2012 Location: Florida Posts: 653 Trader Rating: (3) Feedback Score: 3 reviews	Your not going to reach 400 with 750cc injectors, my 1000cc are like 90% on e85 on 20 psi but that's stock base fuel pressure Sent from my iPhone using Tapatalk

08-09-2015, 10:03 PM	#3712
S13alldayyo Zilvia Addict Join Date: Mar 2012 Location: Florida Posts: 653 Trader Rating: (3) Feedback Score: 3 reviews	E85 bro e85 Sent from my iPhone using Tapatalk

08-09-2015, 11:23 PM	#3713
Bleakley Zilvia Addict Join Date: Apr 2011 Location: Near Pittsburgh, PA Posts: 637 Trader Rating: (1) Feedback Score: 1 reviews	My bad, no knowledge of E-85. I'm surprised you can't. You can push 450-500+ on 93 with Nismo/Tomei/HKS 740's. Surprised you can't hit four hundo on the corn...

08-10-2015, 12:08 AM	#3714
S13alldayyo Zilvia Addict Join Date: Mar 2012 Location: Florida Posts: 653 Trader Rating: (3) Feedback Score: 3 reviews	Remember, e85 is 25-30% more fuel through out the entire map, from idle to redline Sent from my iPhone using Tapatalk

08-10-2015, 10:14 AM	#3716
S13alldayyo Zilvia Addict Join Date: Mar 2012 Location: Florida Posts: 653 Trader Rating: (3) Feedback Score: 3 reviews	There is a calculater on one of the injector websites I forgot Wich one and it calculates what size injector you would need for what size engine for what power goals so you get the right equipment the first time Sent from my iPhone using Tapatalk