GT2871 USERS. SR motor - Page 28 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

G240 · 05-13-2009, 11:12 AM

Quote:

Originally Posted by JacksonBrown

What, in your opinion, is the turbo worthwhile then?
Stock manifold, stock motor, ~$1000 and it makes over 100whp over stock motor, not sacrificing low end power. Please tell us what turbo can accomplish all of this criteria if you have something objective to add to the thread.

Meh It's his thread, I think he can make whatever comments/observations he wants. Maybe this turbo fell short of his expectations. It happens. Lots of guys out there thinking they are going to break 300whp on a t25

cotbu · 05-13-2009, 11:36 AM

Quote:

Originally Posted by slider2828

Yeah I got mine tuned on a dyno dynamics.... That is why I asked

What is up with the Torque numbers? something is not right there as the TQ never crosses HP? That is really weird... Also he has some type of weird smoothing.... Might wanna double-check on that....

Looks like it might be boost, but that's not 18psi if it is.......

OBEEWON · 05-13-2009, 12:53 PM

Quote:

Originally Posted by JacksonBrown

What, in your opinion, is the turbo worthwhile then?
Stock manifold, stock motor, ~$1000 and it makes over 100whp over stock motor, not sacrificing low end power. Please tell us what turbo can accomplish all of this criteria if you have something objective to add to the thread.

Thats the whole reason I started this thread.

Ive changed my setup around this turbo 4 times and have not been satisfied. I was the biggest advocate of this turbo but it is letting me down.

28 pages and I havn't seen a number to justify a .86 over a .64... that makes no sense to me...

Im giving it one more shot. Soon as Im out of paint Im throwing 22psi at it.

slider2828 · 05-13-2009, 01:02 PM

Personally I have seen why a .86 over a .64.....

For my setup a stock intake and exhaust manifolds, and 264 step 1 cams, to have 320HP and 270ft.lbs of torque at 16.5 psi on a dyno dynamics... I highly doubt a .64 can reach it with the same setup. Yes bla bla bla do this and that and boost up on the .64 and yeah it can do it.... But that is apples to oranges....

You have to create the same scenario with two different turbo's on the same boost level, otherwise like I said its apples to oranges. At 4800RPM I made Peak Torque and 5200 Made peak HP.... Like I said I doubt a .64 will do that on the same setup....

Keep in mind I track this car and is conservatively tuned by steve shadows.....

Whatever that maybe, you can't start changing a billion things and just compare the turbos, that just isn't good statistics.

Sileighty_85 · 05-13-2009, 04:29 PM

Quote:

Originally Posted by slider2828

Personally I have seen why a .86 over a .64.....

For my setup a stock intake and exhaust manifolds, and 264 step 1 cams, to have 320HP and 270ft.lbs of torque at 16.5 psi on a dyno dynamics... I highly doubt a .64 can reach it with the same setup. Yes bla bla bla do this and that and boost up on the .64 and yeah it can do it.... But that is apples to oranges....

You have to create the same scenario with two different turbo's on the same boost level, otherwise like I said its apples to oranges. At 4800RPM I made Peak Torque and 5200 Made peak HP.... Like I said I doubt a .64 will do that on the same setup....

Keep in mind I track this car and is conservatively tuned by steve shadows.....

Whatever that maybe, you can't start changing a billion things and just compare the turbos, that just isn't good statistics.

What do you mean? are you saying a .64 wont make the same power at 16.5?

Or a .64 wont break 320whp?

Im making 363whp and 332ft lbs tq @ 21 psi on a .64
with stock cams and intake manifold on a Mustang Dyno

tmsilvia · 05-13-2009, 08:20 PM

Yeah the boost spike 21psi and hold at 18psi.

slider2828 · 05-13-2009, 09:42 PM

NO I meant it won't make the SAME power at 16.5 psi, much less. Is what I meant....

-Ken

Quote:

Originally Posted by Sileighty_85

What do you mean? are you saying a .64 wont make the same power at 16.5?

Or a .64 wont break 320whp?

Im making 363whp and 332ft lbs tq @ 21 psi on a .64
with stock cams and intake manifold on a Mustang Dyno

OBEEWON · 05-14-2009, 06:06 AM

The point I was making was that the power the .86 makes or can make doesn't justify (for me at least) the tradeoff in response.

Im seeing 30r's with more power and similar response to the .86. There is a thread comparing the two. It sucks because I DO NOT want to go top mount.

I have a feeling this would be a great turbo on a motor with more displacement, but im not about to stroke.

G240 · 05-14-2009, 08:13 AM

Obee, have you considered a GT3071/3076 turbo in a bottom mount configuration? I'm sure you'll have to make some slight modifications to fit, but it might be your only option if you are not wanting to change your entire setup completely.

slider2828 · 05-14-2009, 09:35 AM

Obee.... chances are these turbo's are just similar... they aren't like huge differences or anything... .64's having better response than a .86 is more closer to a myth I think .... With the right tune .86's are really good.... You aren't losing much at the bottom end but you have a very strong top end. Its all in the tune.

Why don't you have SteveShadows tune your car? I was a skeptic at first truthfully, but he is VERY good....

Silverbullet · 05-14-2009, 10:05 AM

Quote:

Originally Posted by slider2828

.. chances are these turbo's are just similar... they aren't like huge differences or anything... .64's having better response than a .86 is more closer to a myth I think ......

a myth? These numbers aren't just random values assigned to the product. It is a representation of a turbine's physical dimensioning. Specifically it is the ratio of the inlet inner diameter and the center point of the inlet to the level of the radius of the turbine wheel.

s15specR · 05-14-2009, 10:18 AM

I think its more than a myth, i have a friend with the same setup as i everything the same, except he has an S13 and I an S14 SR20. He is running the .86 and the spool is considerably later.

slider2828 · 05-14-2009, 10:30 AM

What is considerable? Certain mods have greater affect on the turbo's spool characteristics, especially non stock intake and exhaust..... But with Stock intake and stock exhaust... its close....

OBEEWON · 05-14-2009, 10:56 AM

There is def a difference in spool
I've drifted a .64 and my .86. If I let my rpms drop anywhere near 3 grand its a wrap. Granted the .64 car was on stock cams so I don't know how relevant that is.

I have Smelly live ROM tuning me. He is pretty good. I would give Steve a shot but Im not paying to fly him out here or driving to Cali.

I just got off the phone with my friend. I know this is a different motor but this is what he is running.

4G63-stock head and bottom
Stock intake manifold
Stock Exhaust manifold ported
280 cams
3076R

He says he hits at 3800, carries all the way through 8200 and makes 427whp 386lb tq. @ 27psi and peak power is 7100rpm

I havn't seen a 2871 do anything like that.

I do think his PSI is kinda high though. But at 22psi my car felt days slower than his.

fromxtor · 05-14-2009, 11:15 AM

Here's a pic of a friends old setup with a GT3071R bottom mount, his name is wookiballa on here. He now lives in JP and has an S15.

OBEEWON · 05-14-2009, 11:18 AM

Can you give us some info on it? Power and specs?

fromxtor · 05-14-2009, 11:30 AM

^^ I'll e-mail him and ask, all I know right now was it was a T2 footprint.

nisans13turbo · 05-14-2009, 11:33 AM

Hey guys with my setup how much boost can I do before my stock sr fpr is max. I heard 12-13psi and 18psi.

555cc injectors
gt2871r
z32 maf
stock head/block
fmic
enthalpy ecu for my setup

thanks

Sileighty_85 · 05-14-2009, 12:03 PM

Quote:

Originally Posted by nisans13turbo

Hey guys with my setup how much boost can I do before my stock sr fpr is max. I heard 12-13psi and 18psi.

555cc injectors
gt2871r
z32 maf
stock head/block
fmic
enthalpy ecu for my setup

thanks

get 740cc Injectors
just get a Nismo FPR
or better yet a SARD

nisans13turbo · 05-14-2009, 12:07 PM

So what will my setup be capable of ? I want to know this so I know what im getting myself into. Im not doing this for a drag queen more for track/drift and daily.

slider2828 · 05-14-2009, 12:10 PM

Couple of things that make the biggest difference....

CAMS, and both Manifolds.

Stock CAMS are going to spool earlier but lose top end and vice versa..... CAMS make a huge difference on response too.

Greddy Manifold is going to have you lose low end for sure... Losing low end is also response time, which you complaining about.

Equal length manifolds going to lose low end also leading to slow response...
Tomei or Stock or Preferably a Swain and Honed Stock Cast.

Boost controllers make a HUGE difference too.... Depending on gain settings, it changes everything....

Intercooler piping design. Blitz vs Greddy vs HKS vs Ebay.... Its a big difference....

Stock vs Lightened Flywheel

Finally actually better clamps on pipes and couplers make a different too.... Thats just it....

Quote:

Originally Posted by OBEEWON

There is def a difference in spool
I've drifted a .64 and my .86. If I let my rpms drop anywhere near 3 grand its a wrap. Granted the .64 car was on stock cams so I don't know how relevant that is.

I have Smelly live ROM tuning me. He is pretty good. I would give Steve a shot but Im not paying to fly him out here or driving to Cali.

I just got off the phone with my friend. I know this is a different motor but this is what he is running.

4G63-stock head and bottom
Stock intake manifold
Stock Exhaust manifold ported
280 cams
3076R

He says he hits at 3800, carries all the way through 8200 and makes 427whp 386lb tq. @ 27psi and peak power is 7100rpm

I havn't seen a 2871 do anything like that.

I do think his PSI is kinda high though. But at 22psi my car felt days slower than his.

OBEEWON · 05-14-2009, 12:34 PM

Yes those facts are a given. But the bottom line is with comparable setups the .86 just doesn't preform how it should.

nissans13 your fpr will not be your limiting factor. Ive run 22psi on stock fpr and not run out of fuel.

slider2828 · 05-14-2009, 12:44 PM

Its not how it SHOULD perform hahaha, its how you want it to perform.....

Maybe try IHI turbines, or HKS GTRS, I think you will be more happier with performance and power.... Garretts are just blah.....

usdm180sx · 05-14-2009, 12:49 PM

HKS GT-RS is identical to the Garrett gt 2871R .64 trim

OBEEWON · 05-14-2009, 12:59 PM

My problem is I need a V8 lol.

Ahh well. I may just go Disco Potato for response and save the big oomf for my 2j.

slider2828 · 05-14-2009, 01:49 PM

Quote:

Originally Posted by usdm180sx

HKS GT-RS is identical to the Garrett gt 2871R .64 trim

Was thinking about the Pro series....

slider2828 · 05-14-2009, 01:50 PM

Quote:

Originally Posted by OBEEWON

My problem is I need a V8 lol.

Ahh well. I may just go Disco Potato for response and save the big oomf for my 2j.

Yeah you need a 6 cylinder.... Was tuning my friends 2JZ... its so smooth on a T78 compared to our 4 bangers that sound like rattling a tin can with a rock in it....

s15specR · 05-14-2009, 02:35 PM

Quote:

Originally Posted by slider2828

What is considerable? Certain mods have greater affect on the turbo's spool characteristics, especially non stock intake and exhaust..... But with Stock intake and stock exhaust... its close....

Hey had a Greddy intake mani, everything else the same though.

slider2828 · 05-14-2009, 03:24 PM

Tune the same? condition of motor the same?

s15specR · 05-14-2009, 03:31 PM

S13 vs S14 motor stock setup other than the s13 had Greddy Intake Mani.

05-13-2009, 01:02 PM	#814
slider2828 Post Whore! Join Date: Oct 2004 Location: San Francisco, CA Posts: 5,998 Trader Rating: (13) Feedback Score: 13 reviews	Personally I have seen why a .86 over a .64..... For my setup a stock intake and exhaust manifolds, and 264 step 1 cams, to have 320HP and 270ft.lbs of torque at 16.5 psi on a dyno dynamics... I highly doubt a .64 can reach it with the same setup. Yes bla bla bla do this and that and boost up on the .64 and yeah it can do it.... But that is apples to oranges.... You have to create the same scenario with two different turbo's on the same boost level, otherwise like I said its apples to oranges. At 4800RPM I made Peak Torque and 5200 Made peak HP.... Like I said I doubt a .64 will do that on the same setup.... Keep in mind I track this car and is conservatively tuned by steve shadows..... Whatever that maybe, you can't start changing a billion things and just compare the turbos, that just isn't good statistics. __________________ Turn and Burn!

05-14-2009, 06:06 AM	#818
OBEEWON Post Whore! Join Date: Feb 2006 Location: Hightened State of Emergency Posts: 6,053 Trader Rating: (9) Feedback Score: 9 reviews	The point I was making was that the power the .86 makes or can make doesn't justify (for me at least) the tradeoff in response. Im seeing 30r's with more power and similar response to the .86. There is a thread comparing the two. It sucks because I DO NOT want to go top mount. I have a feeling this would be a great turbo on a motor with more displacement, but im not about to stroke. __________________

05-14-2009, 09:35 AM	#820
slider2828 Post Whore! Join Date: Oct 2004 Location: San Francisco, CA Posts: 5,998 Trader Rating: (13) Feedback Score: 13 reviews	Obee.... chances are these turbo's are just similar... they aren't like huge differences or anything... .64's having better response than a .86 is more closer to a myth I think .... With the right tune .86's are really good.... You aren't losing much at the bottom end but you have a very strong top end. Its all in the tune. Why don't you have SteveShadows tune your car? I was a skeptic at first truthfully, but he is VERY good.... __________________ Turn and Burn!

05-14-2009, 10:30 AM	#823
slider2828 Post Whore! Join Date: Oct 2004 Location: San Francisco, CA Posts: 5,998 Trader Rating: (13) Feedback Score: 13 reviews	What is considerable? Certain mods have greater affect on the turbo's spool characteristics, especially non stock intake and exhaust..... But with Stock intake and stock exhaust... its close.... __________________ Turn and Burn!

05-14-2009, 10:56 AM	#824
OBEEWON Post Whore! Join Date: Feb 2006 Location: Hightened State of Emergency Posts: 6,053 Trader Rating: (9) Feedback Score: 9 reviews	There is def a difference in spool I've drifted a .64 and my .86. If I let my rpms drop anywhere near 3 grand its a wrap. Granted the .64 car was on stock cams so I don't know how relevant that is. I have Smelly live ROM tuning me. He is pretty good. I would give Steve a shot but Im not paying to fly him out here or driving to Cali. I just got off the phone with my friend. I know this is a different motor but this is what he is running. 4G63-stock head and bottom Stock intake manifold Stock Exhaust manifold ported 280 cams 3076R He says he hits at 3800, carries all the way through 8200 and makes 427whp 386lb tq. @ 27psi and peak power is 7100rpm I havn't seen a 2871 do anything like that. I do think his PSI is kinda high though. But at 22psi my car felt days slower than his. __________________

05-13-2009, 08:20 PM	#816
tmsilvia Leaky Injector Join Date: Jan 2008 Location: queens, nyc Age: 42 Posts: 69 Trader Rating: (0) Feedback Score: 0 reviews	Yeah the boost spike 21psi and hold at 18psi.

05-14-2009, 08:13 AM	#819
G240 Zilvia Junkie Join Date: Jan 2008 Location: Houston Posts: 349 Trader Rating: (5) Feedback Score: 5 reviews	Obee, have you considered a GT3071/3076 turbo in a bottom mount configuration? I'm sure you'll have to make some slight modifications to fit, but it might be your only option if you are not wanting to change your entire setup completely.

05-14-2009, 10:18 AM	#822
s15specR Zilvia FREAK! Join Date: Oct 2007 Location: USA Posts: 1,022 Trader Rating: (18) Feedback Score: 18 reviews	I think its more than a myth, i have a friend with the same setup as i everything the same, except he has an S13 and I an S14 SR20. He is running the .86 and the spool is considerably later.

05-14-2009, 11:15 AM	#825
fromxtor Post Whore! Join Date: Aug 2005 Location: NC Age: 43 Posts: 3,012 Trader Rating: (23) Feedback Score: 23 reviews	Here's a pic of a friends old setup with a GT3071R bottom mount, his name is wookiballa on here. He now lives in JP and has an S15. __________________ Seller feedback>>http://www.zilvia.net/f/showthread.p...light=fromxtor

05-14-2009, 11:18 AM	#826
OBEEWON Post Whore! Join Date: Feb 2006 Location: Hightened State of Emergency Posts: 6,053 Trader Rating: (9) Feedback Score: 9 reviews	Can you give us some info on it? Power and specs? __________________

05-14-2009, 11:30 AM	#827
fromxtor Post Whore! Join Date: Aug 2005 Location: NC Age: 43 Posts: 3,012 Trader Rating: (23) Feedback Score: 23 reviews	^^ I'll e-mail him and ask, all I know right now was it was a T2 footprint. __________________ Seller feedback>>http://www.zilvia.net/f/showthread.p...light=fromxtor

05-14-2009, 11:33 AM	#828
nisans13turbo Zilvia Junkie Join Date: Feb 2005 Location: Minnesota Posts: 485 Trader Rating: (13) Feedback Score: 13 reviews	Hey guys with my setup how much boost can I do before my stock sr fpr is max. I heard 12-13psi and 18psi. 555cc injectors gt2871r z32 maf stock head/block fmic enthalpy ecu for my setup thanks __________________

05-14-2009, 12:07 PM	#830
nisans13turbo Zilvia Junkie Join Date: Feb 2005 Location: Minnesota Posts: 485 Trader Rating: (13) Feedback Score: 13 reviews	So what will my setup be capable of ? I want to know this so I know what im getting myself into. Im not doing this for a drag queen more for track/drift and daily. __________________

05-14-2009, 12:34 PM	#832
OBEEWON Post Whore! Join Date: Feb 2006 Location: Hightened State of Emergency Posts: 6,053 Trader Rating: (9) Feedback Score: 9 reviews	Yes those facts are a given. But the bottom line is with comparable setups the .86 just doesn't preform how it should. nissans13 your fpr will not be your limiting factor. Ive run 22psi on stock fpr and not run out of fuel. __________________

05-14-2009, 12:44 PM	#833
slider2828 Post Whore! Join Date: Oct 2004 Location: San Francisco, CA Posts: 5,998 Trader Rating: (13) Feedback Score: 13 reviews	Its not how it SHOULD perform hahaha, its how you want it to perform..... Maybe try IHI turbines, or HKS GTRS, I think you will be more happier with performance and power.... Garretts are just blah..... __________________ Turn and Burn!

05-14-2009, 12:49 PM	#834
usdm180sx Post Whore! Join Date: Dec 2005 Location: 562 Posts: 4,807 Trader Rating: (5) Rides Gallery: usdm180sx Feedback Score: 5 reviews	HKS GT-RS is identical to the Garrett gt 2871R .64 trim __________________ -Norm!

05-14-2009, 12:59 PM	#835
OBEEWON Post Whore! Join Date: Feb 2006 Location: Hightened State of Emergency Posts: 6,053 Trader Rating: (9) Feedback Score: 9 reviews	My problem is I need a V8 lol. Ahh well. I may just go Disco Potato for response and save the big oomf for my 2j. __________________

05-14-2009, 03:24 PM	#839
slider2828 Post Whore! Join Date: Oct 2004 Location: San Francisco, CA Posts: 5,998 Trader Rating: (13) Feedback Score: 13 reviews	Tune the same? condition of motor the same? __________________ Turn and Burn!

05-14-2009, 03:31 PM	#840
s15specR Zilvia FREAK! Join Date: Oct 2007 Location: USA Posts: 1,022 Trader Rating: (18) Feedback Score: 18 reviews	S13 vs S14 motor stock setup other than the s13 had Greddy Intake Mani.