GT2871 USERS. SR motor - Page 7 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

S13Dreamer · 03-31-2008, 12:28 PM

Just got my car dynoed. Made 379whp @ 19psi. It was dynoed at 21psi and there weren't any gains so we went back to 19psi.

2871R .86 w/ HKS actuator
Blitz SBC-iD
Apexi PFC (MAP based)
HKS Step 1
HKS 740cc
Cometic HG stock thickness
GReddy IM
Tomei TB
Hybrid FMIC
Electric fans
JUN flywheel
Spec Stage III
GReddy elbow
Megan DP
Invidia exhaust
Peak Performance Composite Intake Gasket
BPi 6in velocity stack

DrifterProdigy85 · 03-31-2008, 06:00 PM

Go with higher lift cams and youll get more top end power.

s13envy · 04-01-2008, 10:11 AM

nice numbers dreamer! like prodigy said, get some higher lift cams and you'll have some more top end. instead of dropping off like that at the end, it should keep going! get some step 2 264's and good springs and raise the rev limit to about 8k or so. that and you should probably be able to push a bit more boost through that turbo for even more power!

slider2828 · 04-01-2008, 11:39 AM

OMG Tomei Throttle Bodies??!?!?! I have almost the same setup except the TB, but is the HKS Wastegate so much better than the one that comes with the turbo?

rotation3x · 04-03-2008, 08:15 AM

S13DREAMER : I have those same injectors and map pfc and could not find the lag time for the injectors to save my life and was wondering what you put in for the lag time/correction.

Here is what I did .66 (which is nismo/tomei lag time) - .58 (stock injector lag time)

so you have .66 -.58 = .08

I saw on another thread that you just guess for you sweet spot which they used .83 - .58 = .25 (which the pfc dosnt show .25) .24 or .26 I choose .26.

I also did 370/740=.50%

steve shadows · 04-03-2008, 08:34 AM

Quote:

Originally Posted by DrifterProdigy85

Go with higher lift cams and youll get more top end power.

I hope you mean Duration

Quote:

Originally Posted by s13envy

nice numbers dreamer! like prodigy said, get some higher lift cams and you'll have some more top end. instead of dropping off like that at the end, it should keep going! get some step 2 264's and good springs and raise the rev limit to about 8k or so. that and you should probably be able to push a bit more boost through that turbo for even more power!

It's duration. Higher duration will push the power band up and out.

Torque is made with optimum lift and duration. I prefer between 260 and 264 max for intake and exhaust on an sr20det setup reving to 8k or under.

idahotuner · 04-03-2008, 12:37 PM

so i am runnigna .64 and 264 cams. the 64s go together lol.
actually ididnt even realize that until now. but i did alot of searching and i wanted cam that would be open the most during the turbos power band.
with my tune and intjectors and cams whould put me right up near 400 rwhp

s13envy · 04-08-2008, 10:23 AM

Quote:

Originally Posted by steve shadows

I hope you mean Duration

It's duration. Higher duration will push the power band up and out.

Torque is made with optimum lift and duration. I prefer between 260 and 264 max for intake and exhaust on an sr20det setup reving to 8k or under.

higher lift will still help in the top end. the more the valve opens, the more air that gets shoved in there. Maybe, I'm wrong, but that makes sense to me.

steve shadows · 04-08-2008, 11:17 AM

your wrong.

Higher lift HELPS but duration is what actually "breathes" more at higher rpms.

low duration with high lift equals a lot or torque, high duration with low lift equals more top end power.

almost all the time. there are variables in tuning of course.

There is also a law of deminishing returns with cam sizing. If you go too large on lift (over 12.-12.5 mm) you just are not getting any more efficiency out of the head (most nissans at least).

11.5-12.0 is the largest I would go with stock displacement and stock valve size.

s13envy · 04-09-2008, 12:25 PM

Quote:

Originally Posted by steve shadows

your wrong.

yeah, well YOU'RE wrong with the way you spelled YOUR

steve shadows · 04-09-2008, 12:29 PM

fine then

GabeS14 · 04-09-2008, 12:37 PM

Quote:

Originally Posted by s13envy

yeah, well YOU'RE wrong with the way you spelled YOUR

lol..what the ???

JVD · 04-09-2008, 02:26 PM

Anyone ever use a T3 exhaust housing 2871r? Just curious because I just recently noticed it's an option. Is there any point, or would it be better to just go with a 3071r? I suck at turbos.

Steve?

steve shadows · 04-09-2008, 02:45 PM

the T28 wheel is smaller, Housng flows more gas, you make a little more breathing room all over with the same wheel, good idea in theory.

Try it, could be better than the 3071R

for certain things.

Only worth it if your using a 38-44 mm external though

JVD · 04-09-2008, 03:14 PM

Quote:

Originally Posted by steve shadows

the T28 wheel is smaller, Housng flows more gas, you make a little more breathing room all over with the same wheel, good idea in theory.

Try it, could be better than the 3071R

for certain things.

Only worth it if your using a 38-44 mm external though

Cool! That's what I was thinking. I might give it a try with a .63 sometime soon.

Thanks.

its a kia · 04-19-2008, 07:34 PM

are there any videos out there of an sr with 2871 .64, cams, high teens boost or anything making around 360rwhp with that general setup

videos that show an actual car moving, would like to see the response and acceleration

im in the middle of my motor build which includes the 2871, would like to see what I should be looking for, as in acceleration

DrifterProdigy85 · 04-20-2008, 06:48 AM

Just ran my 2871R .86 at the track friday night. Best time was a 12.06 @ 120.5mph, 1.9 60ft. Was trying to boost 24psi but spark kept blowing out anything over 20 so the time was @ 18psi. I think the problem is the spark plugs not being cold enough.

idahotuner · 04-20-2008, 09:30 AM

^ hey man waht heat range are you running?

SoguRacing · 04-20-2008, 10:49 PM

Quote:

Originally Posted by DrifterProdigy85

Just ran my 2871R .86 at the track friday night. Best time was a 12.06 @ 120.5mph, 1.9 60ft. Was trying to boost 24psi but spark kept blowing out anything over 20 so the time was @ 18psi. I think the problem is the spark plugs not being cold enough.

engine specs and mods and a dyno chart would be nice

s13envy · 04-21-2008, 11:57 AM

I've ran 25 or so psi on stock ignition with heat range 7 plugs gapped to .025 without blowing out the spark.

DrifterProdigy85 · 04-21-2008, 03:21 PM

Yea some have but many cant. I fall into that category that cant. Anyways, mods are built block, P&P head, Tomei 270 Cams, Greddy Intake, Ichiba V.II Manifold, and Enthalpy Tune that isnt the best tune.

s13envy · 04-22-2008, 07:06 AM

upgraded ignition system? and what plugs are you running?

with 20+psi of boost on that setup you should be able to do low 11's at 125 or so with a good launch

((sr)) kelly · 04-22-2008, 04:00 PM

^ yep... my car ran a 12.4 @ 307ish WHP...

I just dynoed my car and it made 330whp@ 15 psi.. then my EBC shit out on me...

im guessing around 400whp at 22 psi on pump gas (93).. I have HKS 264 step2, but ill be happy with 375ish

jspaeth · 04-22-2008, 04:57 PM

Quote:

Originally Posted by s13envy

I've ran 25 or so psi on stock ignition with heat range 7 plugs gapped to .025 without blowing out the spark.

I don't believe I am having this problem, but could someone enlighten me as to how you would know if this was happening....aka sypmtoms

OBEEWON · 04-22-2008, 05:01 PM

Missing at high psi. I had this issue over 20 psi, I just tightened my gap to .023. Step 7's

SoguRacing · 04-22-2008, 05:03 PM

maybe .025 is too small of a gap. .03 should be enough. if the gap is too small there will be less atomized air fuel mixture being ignited. A smaller gap means less volume of A/F mixture and a smaller surface area of spark.

codyace · 04-22-2008, 05:11 PM

Quote:

Originally Posted by s13envy

with 20+psi of boost on that setup you should be able to do low 11's at 125 or so with a good launch

With slicks of course, not street tires.

Quote:

Originally Posted by OBEEWON

Missing at high psi. I had this issue over 20 psi, I just tightened my gap to .023. Step 7's

.022-.024 for anythign I have. I also have the XS Engineering power pack too.

I'll try to get some video when my car is back out. It's kinda nutty with the 4.60's in it!

s13envy · 04-23-2008, 04:48 AM

Quote:

Originally Posted by jspaeth

I don't believe I am having this problem, but could someone enlighten me as to how you would know if this was happening....aka sypmtoms

I normally noticed it in 3rd gear. high boost, heavy loads, it would spit and sputter.

Quote:

Originally Posted by codyace

With slicks of course, not street tires.

well of course. thats why i said with a good 60'. and by good 60' i mean atleast a 1.6

s13envy · 04-23-2008, 04:50 AM

Quote:

Originally Posted by ((sr)) kelly

^ yep... my car ran a 12.4 @ 307ish WHP...

I just dynoed my car and it made 330whp@ 15 psi.. then my EBC shit out on me...

im guessing around 400whp at 22 psi on pump gas (93).. I have HKS 264 step2, but ill be happy with 375ish

I ran a 12.4 on a stock ecu, stock maf, stock injectors w/ a FP Big28 turbo lol. I dyno'd 330whp and ran an 11.59. But I was pulling very good 60' times

((sr)) kelly · 04-23-2008, 06:14 AM

my 60 times SUCKED hahaha... as soon as my turbo sees set boost around 5k, ill just spin 1st, then ill have to lazy shift into 2nd

03-31-2008, 12:28 PM	#181
S13Dreamer Leaky Injector Join Date: Dec 2002 Location: Holmdel, NJ Posts: 140 Trader Rating: (2) Feedback Score: 2 reviews	Just got my car dynoed. Made 379whp @ 19psi. It was dynoed at 21psi and there weren't any gains so we went back to 19psi. 2871R .86 w/ HKS actuator Blitz SBC-iD Apexi PFC (MAP based) HKS Step 1 HKS 740cc Cometic HG stock thickness GReddy IM Tomei TB Hybrid FMIC Electric fans JUN flywheel Spec Stage III GReddy elbow Megan DP Invidia exhaust Peak Performance Composite Intake Gasket BPi 6in velocity stack __________________

03-31-2008, 06:00 PM	#182
DrifterProdigy85 Leaky Injector Join Date: Aug 2004 Location: Glen Rock, PA Age: 38 Posts: 100 Trader Rating: (0) Feedback Score: 0 reviews	Go with higher lift cams and youll get more top end power. __________________ 1995 Nissan 240sx RB25DET

04-01-2008, 11:39 AM	#184
slider2828 Post Whore! Join Date: Oct 2004 Location: San Francisco, CA Posts: 5,998 Trader Rating: (13) Feedback Score: 13 reviews	OMG Tomei Throttle Bodies??!?!?! I have almost the same setup except the TB, but is the HKS Wastegate so much better than the one that comes with the turbo? __________________ Turn and Burn!

04-08-2008, 11:17 AM	#189
steve shadows Post Whore! Join Date: Aug 2003 Location: LA and OC Posts: 8,202 Trader Rating: (5) Feedback Score: 5 reviews	your wrong. Higher lift HELPS but duration is what actually "breathes" more at higher rpms. low duration with high lift equals a lot or torque, high duration with low lift equals more top end power. almost all the time. there are variables in tuning of course. There is also a law of deminishing returns with cam sizing. If you go too large on lift (over 12.-12.5 mm) you just are not getting any more efficiency out of the head (most nissans at least). 11.5-12.0 is the largest I would go with stock displacement and stock valve size. __________________ Like Me on FaceBook !

04-09-2008, 12:29 PM	#191
steve shadows Post Whore! Join Date: Aug 2003 Location: LA and OC Posts: 8,202 Trader Rating: (5) Feedback Score: 5 reviews	fine then __________________ Like Me on FaceBook !

04-01-2008, 10:11 AM	#183
s13envy Zilvia Junkie Join Date: May 2004 Location: Shelbyville, IN Age: 40 Posts: 407 Trader Rating: (3) Feedback Score: 3 reviews	nice numbers dreamer! like prodigy said, get some higher lift cams and you'll have some more top end. instead of dropping off like that at the end, it should keep going! get some step 2 264's and good springs and raise the rev limit to about 8k or so. that and you should probably be able to push a bit more boost through that turbo for even more power!

04-03-2008, 08:15 AM	#185
rotation3x Zilvia Member Join Date: Jun 2005 Location: virginia Age: 38 Posts: 272 Trader Rating: (2) Feedback Score: 2 reviews	S13DREAMER : I have those same injectors and map pfc and could not find the lag time for the injectors to save my life and was wondering what you put in for the lag time/correction. Here is what I did .66 (which is nismo/tomei lag time) - .58 (stock injector lag time) so you have .66 -.58 = .08 I saw on another thread that you just guess for you sweet spot which they used .83 - .58 = .25 (which the pfc dosnt show .25) .24 or .26 I choose .26. I also did 370/740=.50%

04-03-2008, 12:37 PM	#187
idahotuner Zilvia FREAK! Join Date: Jan 2008 Location: St. Maries, Idaho Age: 35 Posts: 1,276 Trader Rating: (17) Rides Gallery: idahotuner Feedback Score: 17 reviews	so i am runnigna .64 and 264 cams. the 64s go together lol. actually ididnt even realize that until now. but i did alot of searching and i wanted cam that would be open the most during the turbos power band. with my tune and intjectors and cams whould put me right up near 400 rwhp

04-09-2008, 02:26 PM	#193
JVD Nissanaholic! Join Date: Feb 2005 Location: Alberta, Canada Age: 35 Posts: 1,820 Trader Rating: (0) Feedback Score: 0 reviews	Anyone ever use a T3 exhaust housing 2871r? Just curious because I just recently noticed it's an option. Is there any point, or would it be better to just go with a 3071r? I suck at turbos. Steve?

04-09-2008, 02:45 PM	#194
steve shadows Post Whore! Join Date: Aug 2003 Location: LA and OC Posts: 8,202 Trader Rating: (5) Feedback Score: 5 reviews	the T28 wheel is smaller, Housng flows more gas, you make a little more breathing room all over with the same wheel, good idea in theory. Try it, could be better than the 3071R for certain things. Only worth it if your using a 38-44 mm external though __________________ Like Me on FaceBook !

04-19-2008, 07:34 PM	#196
its a kia Leaky Injector Join Date: Jul 2007 Location: Cincy,OH Age: 37 Posts: 64 Trader Rating: (0) Feedback Score: 0 reviews	are there any videos out there of an sr with 2871 .64, cams, high teens boost or anything making around 360rwhp with that general setup videos that show an actual car moving, would like to see the response and acceleration im in the middle of my motor build which includes the 2871, would like to see what I should be looking for, as in acceleration

04-20-2008, 06:48 AM	#197
DrifterProdigy85 Leaky Injector Join Date: Aug 2004 Location: Glen Rock, PA Age: 38 Posts: 100 Trader Rating: (0) Feedback Score: 0 reviews	Just ran my 2871R .86 at the track friday night. Best time was a 12.06 @ 120.5mph, 1.9 60ft. Was trying to boost 24psi but spark kept blowing out anything over 20 so the time was @ 18psi. I think the problem is the spark plugs not being cold enough. __________________ 1995 Nissan 240sx RB25DET

04-20-2008, 09:30 AM	#198
idahotuner Zilvia FREAK! Join Date: Jan 2008 Location: St. Maries, Idaho Age: 35 Posts: 1,276 Trader Rating: (17) Rides Gallery: idahotuner Feedback Score: 17 reviews	^ hey man waht heat range are you running?

04-21-2008, 11:57 AM	#200
s13envy Zilvia Junkie Join Date: May 2004 Location: Shelbyville, IN Age: 40 Posts: 407 Trader Rating: (3) Feedback Score: 3 reviews	I've ran 25 or so psi on stock ignition with heat range 7 plugs gapped to .025 without blowing out the spark.

04-21-2008, 03:21 PM	#201
DrifterProdigy85 Leaky Injector Join Date: Aug 2004 Location: Glen Rock, PA Age: 38 Posts: 100 Trader Rating: (0) Feedback Score: 0 reviews	Yea some have but many cant. I fall into that category that cant. Anyways, mods are built block, P&P head, Tomei 270 Cams, Greddy Intake, Ichiba V.II Manifold, and Enthalpy Tune that isnt the best tune. __________________ 1995 Nissan 240sx RB25DET

04-22-2008, 07:06 AM	#202
s13envy Zilvia Junkie Join Date: May 2004 Location: Shelbyville, IN Age: 40 Posts: 407 Trader Rating: (3) Feedback Score: 3 reviews	upgraded ignition system? and what plugs are you running? with 20+psi of boost on that setup you should be able to do low 11's at 125 or so with a good launch

04-22-2008, 04:00 PM	#203
((sr)) kelly BANNED Join Date: Jun 2007 Location: Zebulon... NC Posts: 1,035 Trader Rating: (6) Feedback Score: 6 reviews	^ yep... my car ran a 12.4 @ 307ish WHP... I just dynoed my car and it made 330whp@ 15 psi.. then my EBC shit out on me... im guessing around 400whp at 22 psi on pump gas (93).. I have HKS 264 step2, but ill be happy with 375ish

04-22-2008, 05:01 PM	#205
OBEEWON Post Whore! Join Date: Feb 2006 Location: Hightened State of Emergency Posts: 6,053 Trader Rating: (9) Feedback Score: 9 reviews	Missing at high psi. I had this issue over 20 psi, I just tightened my gap to .023. Step 7's __________________

04-22-2008, 05:03 PM	#206
SoguRacing Post Whore! Join Date: Nov 2007 Location: (714) Age: 38 Posts: 2,967 Trader Rating: (23) Rides Gallery: SoguRacing Feedback Score: 23 reviews	maybe .025 is too small of a gap. .03 should be enough. if the gap is too small there will be less atomized air fuel mixture being ignited. A smaller gap means less volume of A/F mixture and a smaller surface area of spark. __________________ Pre Tune Checkup! Compression,LeakDown,Vacuum Test $80. Cams Install: $180

04-23-2008, 06:14 AM	#210
((sr)) kelly BANNED Join Date: Jun 2007 Location: Zebulon... NC Posts: 1,035 Trader Rating: (6) Feedback Score: 6 reviews	my 60 times SUCKED hahaha... as soon as my turbo sees set boost around 5k, ill just spin 1st, then ill have to lazy shift into 2nd