gt2871r will run okay? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

sr20boi · 10-15-2010, 10:33 AM

im going to get this turbo installed in my ride.gt2871r. i have a redtop sr20det stock with just exhaust and pullies and a short throw shifter. i want to know if its okay to run it like this with out my fuel upgraded..???? will it start to fuck my shit up and start driving shitty??? I wont be ragging on it untill i get that done though..Thanks.

jspaeth · 10-15-2010, 10:45 AM

Quote:

Originally Posted by sr20boi

im going to get this turbo installed in my ride.gt2871r. i have a redtop sr20det stock with just exhaust and pullies and a short throw shifter. i want to know if its okay to run it like this with out my fuel upgraded..???? will it start to fuck my shit up and start driving shitty??? I wont be ragging on it untill i get that done though..Thanks.

If you are on stock maf and stock injectors, you CAN "drive" the car, but I would not let it build boost beyond 3 or 4 psi or whatever, or else you are gonna probably cause damage.

confuzed240 · 10-15-2010, 11:22 AM

Had this same set up. DON'T BOOST. Air fuel ratio look like an N/A at 7psi. Its going to run like shit too FYI.

sr20boi · 10-15-2010, 11:32 AM

so i should just drive it easy? i have no other car so im going to have to be driving it.. and ya i do have all that stock. thanks for the info.

Corbic · 10-22-2010, 09:02 PM

Quote:

Originally Posted by sr20boi

so i should just drive it easy? i have no other car so im going to have to be driving it.. and ya i do have all that stock. thanks for the info.

Better off bypassing the turbo.

codyace · 10-23-2010, 09:09 AM

nevertheless - you could have easily searched that

Quote:

Originally Posted by Corbic

Better off bypassing the turbo.

LOL

lok · 10-19-2010, 05:00 PM

Quote:

Originally Posted by jspaeth

If you are on stock maf and stock injectors, you CAN "drive" the car, but I would not let it build boost beyond 3 or 4 psi or whatever, or else you are gonna probably cause damage.

you are fucking stupid.

i have had my sr for 7 years.

i have run on stock maf, injectors and ecu with a wideband and nissan consult data log.

T25 @ 10 psi not maxing out anything with good afr's

S14 T28 @ 7 psi and 10 psi, again not maxing anything and good afr's

2871r .64 @7 and 10 psi " " "...

2871r .86 " " " " " "...

I have tracked and drifted all these setups and still have a perfectly good motor.

s14unimog · 10-15-2010, 11:51 AM

these posts make my brain hurt... Don't do it dude, just keep it stock and learn about what's there, how it works, and what's involved with upgrading before you grenade something...

sr20boi · 10-15-2010, 04:36 PM

i would but my stock one has blown turbo seals so its a must that i change it..

jspaeth · 10-15-2010, 06:41 PM

Everyone that is saying "don't do it"............well that is not quite fair.

If he LISTENS and does NOT boost the car above 3-4 psi, it will be FINE.

He CAN still use the car for cruising and should have no problems.

On a MAF based setup, it doesn't matter HOW you get the airflow, all that matters is the mass air flow of air into the engine.

A GT2871R at 3-4 psi or less will not produce more than 230-240 hp worth of air, which is what you can safely run with the stock T25 at 14 psi.

It is fine. Just don't boost it more than 3-4 psi.

S13 curtis · 10-15-2010, 10:48 PM

Quote:

Originally Posted by jspaeth

Everyone that is saying "don't do it"............well that is not quite fair.

If he LISTENS and does NOT boost the car above 3-4 psi, it will be FINE.

He CAN still use the car for cruising and should have no problems.

On a MAF based setup, it doesn't matter HOW you get the airflow, all that matters is the mass air flow of air into the engine.

A GT2871R at 3-4 psi or less will not produce more than 230-240 hp worth of air, which is what you can safely run with the stock T25 at 14 psi.

It is fine. Just don't boost it more than 3-4 psi.

best advice on this thread

And YES you can drive it. just dont go wide open with it because you dont have the fuel to support it.

I had a stock sr with a 2871r and it will lean out wide open but you can grandma drive it anywhere with no problems.

LSjauN · 10-16-2010, 04:16 AM

Quote:

Originally Posted by jspaeth

Everyone that is saying "don't do it"............well that is not quite fair.

If he LISTENS and does NOT boost the car above 3-4 psi, it will be FINE.

He CAN still use the car for cruising and should have no problems.

On a MAF based setup, it doesn't matter HOW you get the airflow, all that matters is the mass air flow of air into the engine.

A GT2871R at 3-4 psi or less will not produce more than 230-240 hp worth of air, which is what you can safely run with the stock T25 at 14 psi.

It is fine. Just don't boost it more than 3-4 psi.

THIS

If your just gonna use it for the time being DD'ing it, cruising it around town, non ricer mode, you should be perfectly fine.

If I were you, I'd just get the 2871r, save it, and get a stock replacement till you can afford to get the Fuel management upgrade.

My old Twofarty had a 2871r on it, but i had 650cc injectors, 325lph Nismo pump, 1/4" larger Braided fuel lines, was running megasquirt and was Dyno Tuned on Nistune at 17psi, it was simply amazing.

It'd definatly be worth the wait, if you can do it.

sr20boi · 10-17-2010, 04:52 PM

nice info... if i get my turbo installed by a professional i get a year warranty with it so thats why i dont want to do it myself.

i will get it done with in a week or so, so i hope it works out ahaha. i would so wait but its my daily driver so its a MUST that i drive it.. would a fuel regulator make a diffrence?

jspaeth · 10-18-2010, 08:00 AM

Quote:

Originally Posted by sr20boi

nice info... if i get my turbo installed by a professional i get a year warranty with it so thats why i dont want to do it myself.

i will get it done with in a week or so, so i hope it works out ahaha. i would so wait but its my daily driver so its a MUST that i drive it.. would a fuel regulator make a diffrence?

No don't touch the fuel regulator. Just baby the shit out of it and don't boost it until you get 1) a new MAF sensor (upgraded to Z32...300zx one...) and 2) New injectors and 3) a proper tune.

That is gonna cost you an extra $700-$1000, depending upon if you buy all new stuff or if you buy used stuff, and also on what quality injecetors you get.

sr20boi · 10-18-2010, 10:57 AM

alright thanks... what if i just get a maf and a tune because im short on money for the injectors..?

project7x · 10-15-2010, 09:58 PM

well i would probly upgrade ECU if your going to slap that turbo on. Whats this "get it installed" BS who gets their turbo shit done for them? haha.

Im running the same turbo with 370cc injectors and NISTUNE'd ecu at 12psi on my KA with stock internals. And am having great success. gt2871r is a nice kick in the ass thats forsure.

zurud · 10-17-2010, 11:32 PM

warranty only cover work being done which is turbo installation. It is Not for blown motor when you boosting everywhere and everytime.

Ham Sandwich · 10-18-2010, 01:00 PM

Well then you're just gonna have to re-tune to the new injectors you get. Like what's been said already, either just install it and don't boost past a few psi for now or get a t25 for a few hundred and don't worry about the gt28 until you have the money to support it.

mattsil80wis · 10-18-2010, 01:10 PM

dont forget he is gonna need a fuel pump too

mct3351 · 10-19-2010, 09:04 AM

You will be perfectly fine running 7 psig (stock wastegate setting) on a 2871 up to 7,500 rpm with a stock fuel system. You wouldnt make any more power at 7 psig on a 2871 than you would with a t28 at 7 psig, beacuse the t28 is still in a decent efficiency range on a 2.0 liter motor at 7 psig and 7k rpm. This is all true as long as all the other "bugs" are worked out (base timing, maf wiring, boost leaks, water temp, injector condition, fuel pressure...etc).

jspaeth · 10-19-2010, 01:49 PM

Quote:

Originally Posted by mct3351

You will be perfectly fine running 7 psig (stock wastegate setting) on a 2871 up to 7,500 rpm with a stock fuel system. You wouldnt make any more power at 7 psig on a 2871 than you would with a t28 at 7 psig, beacuse the t28 is still in a decent effiency range on a 2.0 liter motor at 7 psig and 7k rpm. This is all true as long as all the other "bugs" are worked out (base timing, maf wiring, boost leaks, water temp, injector condition, fuel pressure...etc).

Yeah, that makes SENSE!

Please do not give out information that is wrong, unless you want to send this guy $3000 for a motor rebuild when his engine blows.

Two different turbos do NOT (necessarily) put out the same mass air flow at the same psi.

The S14 SR T28 turbo does not flow the same air at 7 psi as a GT2871R at 7 psi, so please do not tell people that.

mct3351 · 10-19-2010, 03:07 PM

If you could read a compressor map you'd see that at 7 psig manifold pressure a stock t28 can efficiently and adequatly provide mass/volumetric flow to keep up with a 2.0 liter engine to 7,000 + rpm. Your assumption only holds true when the volumetric/mass flow rate demand (calculated as a function of engine speed, displacement, manifold pressure and intake air temp.) exceeds the cabaility of the t28 compressor. This happens around 12-14 psi when comparing a t28 to a 2871. So, yes 14 psig with a t28 is not the same as 14 psig with a 2871. But, a t28 and a 2871 will provide approximatly equal mass/volumetric flow rates until redline when the flow rate demanded of the compressor is only enough to maitain 7psig of manifold pressure on a 2 liter engine.

Additionally, I personally ran a 2871 on stock injectors and maf for about 6 months. From memory, at the stock wastegate setting the injector duty cycle barely ever got over 80% and the stock maf never read over 4 volts (as measured with a powerfc).

So, as you can clearly see, the stock fuel system is completely adaquate to handle ANY sized turbo/supercharger capable of maintaining 7 psig manifold pressure up to 7,000 rpm with reasonable intake air temperatures (ie. not -40 F or anything of the likes). It however could not keep up at say 10,000rpm (if the engine could spin that fast) or if the engine was larger than 2.0 liters.

Quote:

Originally Posted by jspaeth

Yeah, that makes SENSE!

Please do not give out information that is wrong, unless you want to send this guy $3000 for a motor rebuild when his engine blows.

Two different turbos do NOT (necessarily) put out the same mass air flow at the same psi.

The S14 SR T28 turbo does not flow the same air at 7 psi as a GT2871R at 7 psi, so please do not tell people that.

jspaeth · 10-19-2010, 03:26 PM

Quote:

Originally Posted by mct3351

So, as you can clearly see, the stock fuel system is completely adaquate to handle ANY sized turbo/supercharger capable of maintaining 7 psig manifold pressure up to 7,000 rpm with reasonable intake air temperatures (ie. not -40 F or anything of the likes). It however could not keep up at say 10,000rpm (if the engine could spin that fast) or if the engine was larger than 2.0 liters.

OMG.......please answer this question for me.....

Would you say that you agree with the following statement:

"7 psi is 7 psi is 7 psi.......it doesn't matter what turbo it is, all that matters is that it's 7 psi in the intake manifold".

I would like a YES or a NO answer to that question.

Walperstyle · 10-19-2010, 12:53 PM

Get an O2 gauge in your car so you can tell how your car is running. Then you can start to play with boost, fuel ect.

nevertheless · 10-19-2010, 04:01 PM

I have a question what psi should I run at..
freshly built cp pistons/ eagle rods
apexi metal headgasket
arp headstuds
255 walbro
stock injectors tho.
s14 t28

VQMaxFan · 10-19-2010, 05:34 PM

Ran mine for about 6 months also. didn't drive it too much though. also mine was an hks gtrs if it really makes that much of a difference. Never raised the boost though. I had a wideband and afpr atleast though.

nevertheless · 10-22-2010, 07:34 PM

I have a question what psi should I run at..
freshly built cp pistons/ eagle rods
apexi metal headgasket
arp headstuds
255 walbro
stock injectors tho.
s14 t28

S13 curtis · 10-22-2010, 08:36 PM

Quote:

Originally Posted by nevertheless

I have a question what psi should I run at..
freshly built cp pistons/ eagle rods
apexi metal headgasket
arp headstuds
255 walbro
stock injectors tho.
s14 t28

The same as if it was stock because of those injectors!

Anything over 9-11psi on a S14 T28 with 370's its going to get lean at stock fuel pressure.

slim_240 · 11-03-2010, 10:41 PM

don't wanna thread jack but since we're kinda on the subject, is there a limit difference on a N62 and a Z32 maf?

Sileighty_85 · 11-03-2010, 11:57 PM

Quote:

Originally Posted by slim_240

don't wanna thread jack but since we're kinda on the subject, is there a limit difference on a N62 and a Z32 maf?

the N62 is the 300ZX MAFS, Same MAFS

10-15-2010, 10:33 AM	#1
sr20boi Join Date: May 2010 Location: rogers, arkansas Age: 30 Posts: 25 Trader Rating: (0) Feedback Score: 0 reviews	gt2871r will run okay? im going to get this turbo installed in my ride.gt2871r. i have a redtop sr20det stock with just exhaust and pullies and a short throw shifter. i want to know if its okay to run it like this with out my fuel upgraded..???? will it start to fuck my shit up and start driving shitty??? I wont be ragging on it untill i get that done though..Thanks.

10-15-2010, 11:51 AM	#8
s14unimog Nissanaholic! Join Date: Dec 2003 Location: In a place, near a river, over a lake Age: 34 Posts: 2,415 Trader Rating: (22) Rides Gallery: s14unimog Feedback Score: 22 reviews	these posts make my brain hurt... Don't do it dude, just keep it stock and learn about what's there, how it works, and what's involved with upgrading before you grenade something... __________________ Fuking ginger bread man stole my wallet... SHIFT*lock_slide to side d3m3rs0n: if i have a baby im naming it Brandons Fault Emerson

10-15-2010, 06:41 PM	#10
jspaeth Nissanaholic! Join Date: Mar 2006 Location: Philadelphia suburbs Age: 37 Posts: 2,347 Trader Rating: (7) Rides Gallery: jspaeth Feedback Score: 7 reviews	Everyone that is saying "don't do it"............well that is not quite fair. If he LISTENS and does NOT boost the car above 3-4 psi, it will be FINE. He CAN still use the car for cruising and should have no problems. On a MAF based setup, it doesn't matter HOW you get the airflow, all that matters is the mass air flow of air into the engine. A GT2871R at 3-4 psi or less will not produce more than 230-240 hp worth of air, which is what you can safely run with the stock T25 at 14 psi. It is fine. Just don't boost it more than 3-4 psi. __________________ Daily driven

10-19-2010, 09:04 AM	#20
mct3351 Leaky Injector Join Date: Nov 2004 Location: Oklahoma Posts: 117 Trader Rating: (4) Feedback Score: 4 reviews	You will be perfectly fine running 7 psig (stock wastegate setting) on a 2871 up to 7,500 rpm with a stock fuel system. You wouldnt make any more power at 7 psig on a 2871 than you would with a t28 at 7 psig, beacuse the t28 is still in a decent efficiency range on a 2.0 liter motor at 7 psig and 7k rpm. This is all true as long as all the other "bugs" are worked out (base timing, maf wiring, boost leaks, water temp, injector condition, fuel pressure...etc). __________________ Last edited by mct3351; 10-19-2010 at 07:55 PM.. Reason: typos

10-19-2010, 12:53 PM	#24
Walperstyle Nissanaholic! Join Date: Nov 2004 Location: Alberta, Red Derp Age: 40 Posts: 1,729 Trader Rating: (0) Feedback Score: 0 reviews	Get an O2 gauge in your car so you can tell how your car is running. Then you can start to play with boost, fuel ect. __________________ KA-T ORG-Function over Flush

10-15-2010, 11:22 AM	#3
confuzed240 Zilvia Member Join Date: May 2009 Location: Raleigh Age: 32 Posts: 178 Trader Rating: (3) Feedback Score: 3 reviews	Had this same set up. DON'T BOOST. Air fuel ratio look like an N/A at 7psi. Its going to run like shit too FYI.

10-15-2010, 11:32 AM	#4
sr20boi Join Date: May 2010 Location: rogers, arkansas Age: 30 Posts: 25 Trader Rating: (0) Feedback Score: 0 reviews	so i should just drive it easy? i have no other car so im going to have to be driving it.. and ya i do have all that stock. thanks for the info.

10-15-2010, 04:36 PM	#9
sr20boi Join Date: May 2010 Location: rogers, arkansas Age: 30 Posts: 25 Trader Rating: (0) Feedback Score: 0 reviews	i would but my stock one has blown turbo seals so its a must that i change it..

10-17-2010, 04:52 PM	#13
sr20boi Join Date: May 2010 Location: rogers, arkansas Age: 30 Posts: 25 Trader Rating: (0) Feedback Score: 0 reviews	nice info... if i get my turbo installed by a professional i get a year warranty with it so thats why i dont want to do it myself. i will get it done with in a week or so, so i hope it works out ahaha. i would so wait but its my daily driver so its a MUST that i drive it.. would a fuel regulator make a diffrence?

10-18-2010, 10:57 AM	#15
sr20boi Join Date: May 2010 Location: rogers, arkansas Age: 30 Posts: 25 Trader Rating: (0) Feedback Score: 0 reviews	alright thanks... what if i just get a maf and a tune because im short on money for the injectors..?

10-15-2010, 09:58 PM	#16
project7x Leaky Injector Join Date: May 2010 Location: Canada/Washington Posts: 52 Trader Rating: (3) Feedback Score: 3 reviews	well i would probly upgrade ECU if your going to slap that turbo on. Whats this "get it installed" BS who gets their turbo shit done for them? haha. Im running the same turbo with 370cc injectors and NISTUNE'd ecu at 12psi on my KA with stock internals. And am having great success. gt2871r is a nice kick in the ass thats forsure.

10-17-2010, 11:32 PM	#17
zurud Zilvia Junkie Join Date: Aug 2009 Location: evansville, in Posts: 391 Trader Rating: (4) Feedback Score: 4 reviews	warranty only cover work being done which is turbo installation. It is Not for blown motor when you boosting everywhere and everytime.

10-18-2010, 01:00 PM	#18
Ham Sandwich Join Date: Jun 2009 Location: NJ Posts: 31 Trader Rating: (1) Feedback Score: 1 reviews	Well then you're just gonna have to re-tune to the new injectors you get. Like what's been said already, either just install it and don't boost past a few psi for now or get a t25 for a few hundred and don't worry about the gt28 until you have the money to support it.

10-18-2010, 01:10 PM	#19
mattsil80wis Zilvia Junkie Join Date: Jan 2008 Location: nj Age: 34 Posts: 391 Trader Rating: (6) Feedback Score: 6 reviews	dont forget he is gonna need a fuel pump too

10-19-2010, 04:01 PM	#25
nevertheless Zilvia Junkie Join Date: Jan 2009 Location: omaha, ne Age: 30 Posts: 502 Trader Rating: (5) Feedback Score: 5 reviews	I have a question what psi should I run at.. freshly built cp pistons/ eagle rods apexi metal headgasket arp headstuds 255 walbro stock injectors tho. s14 t28

10-19-2010, 05:34 PM	#26
VQMaxFan Zilvia Junkie Join Date: May 2008 Location: Mobile AL Age: 32 Posts: 464 Trader Rating: (3) Feedback Score: 3 reviews	Ran mine for about 6 months also. didn't drive it too much though. also mine was an hks gtrs if it really makes that much of a difference. Never raised the boost though. I had a wideband and afpr atleast though.

10-22-2010, 07:34 PM	#27
nevertheless Zilvia Junkie Join Date: Jan 2009 Location: omaha, ne Age: 30 Posts: 502 Trader Rating: (5) Feedback Score: 5 reviews	I have a question what psi should I run at.. freshly built cp pistons/ eagle rods apexi metal headgasket arp headstuds 255 walbro stock injectors tho. s14 t28

11-03-2010, 10:41 PM	#29
slim_240 Zilvia Member Join Date: Jun 2009 Location: dallas, tx Posts: 246 Trader Rating: (3) Feedback Score: 3 reviews	don't wanna thread jack but since we're kinda on the subject, is there a limit difference on a N62 and a Z32 maf? __________________

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