KiNg MaRtY

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.

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92 Galant VR4 - E3 16g, KW V3 / 94 Miata / 2006 Evo IX - 417 HP 418 TQ

Dboyizmlg

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

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!!!

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LoverTechnologies "Half Broken Things!"

Dboyizmlg

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

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


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Dboyizmlg

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

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


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Dboyizmlg

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

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

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5280VertDET

BUMP again,

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

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S13 Vert | SR | PE1420 | 5-Speed | 15x9.5 - 0 |

Dboyizmlg

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

Bleakley

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

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

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

^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

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

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.

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S13 Vert | SR | PE1420 | 5-Speed | 15x9.5 - 0 |

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


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e1_griego

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

I stand corrected, no knowledge of E85.

Dboyizmlg

No, not on E85 fuel!

Pump gas, yes

S13alldayyo

E85 bro e85


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Bleakley

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

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


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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.

S13alldayyo

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

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

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

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Turn and Burn!

s13drob

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

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