GT2871 USERS. SR motor - Page 75 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Mirage · 10-21-2011, 10:24 AM

I know i've read about plenty of people having similar issues when not running an actual Nissan Z32 MAF, especially over on SXOC. Maybe try to borrow a known good working MAF to try it out with.

I've had sporadic AFR issues from a bad ground before, the main battery ground on the body side had loosened up due to a stripped out hole. I know you checked your MAF ground, but check out your other major ones too.

cotbu · 10-21-2011, 10:24 AM

^^^^Hey what hes saying^^^^

Tell jwt it's an isis mafs not an oem z32 mafs. Get your hands on an OEM z32 mafs and retest.

BlackZenkiS14 · 10-21-2011, 11:35 AM

Im going to try to do that tonight. Thanks guys. I hope I can get it figured out :/

usdm180sx · 10-21-2011, 03:34 PM

Good luck. That's why I don't like mail order rom tunes. Too much waiting and paying for shipping if u gotta ship it back and you still gotta do a dyno run each time to make sure it runs right.

codyace · 10-21-2011, 04:58 PM

In regard to the crack and that hole on the manifold, it would be on your end (as said in PM). The cracks are actually common to the point that I've seen them on plenty of Manifolds, to include FWD ones. It becomes even more prevelent with the extrude hone process due to material removed.

Having had quite a few of them this way without any issue (crack and small hole), to include my personal car, my roomates car, and many others, I wouldn't worry too much about it. With that said, if it were to crack and fall into the turbo, I don't want my words to stand as any promise/garuntee either...as I'm not any sort of engineer or materials expert.

Kingtal0n · 10-21-2011, 11:23 PM

Many manifolds are not designed with the weight of the exhaust system/turbocharger in mind. For a given exhaust manifold, the best possible configuration is one in which the turbocharger and all of its associated hardware, including downpipe and compressor outlet, is all supported by the engine via brackets. The purpose of the exhaust manifold is to direct the exhaust gasses- NOT to support the entire weight of the exhaust system!

Thats the #1 reason aftermarket manifolds fail, improper installation, i.e. improper support. Think about the twisting motion of the engine- think about how everytime you mash the pedal the manifold is being wrenched in every which direction against the weight bolted to it. There is a reason that even the factory includes a support brace for the OEM downpipe, and utilizes such a beefy casting to begin with.

EsChassisLove · 10-21-2011, 11:29 PM

That must be what the bracket on the side of the 2871 is for lol

zurud · 10-22-2011, 03:48 AM

I've never seen support brace for oem downpipe.

***S14DB*** · 10-22-2011, 11:21 PM

The bracket is for the heat shield.

EsChassisLove · 10-22-2011, 11:30 PM

WTF is a heat shield

lol

s13Kurt · 11-07-2011, 01:03 AM

Quick question guys before I go tuning this car tomorrow. Car is a simple sti injector, jwt mail order, z32, 255, and an safc. How strong are the stock timing tables? Since I dont have to remove alot of fuel the timing shouldn't be too crazy. My question is how hard can the s15 t28 be pushed?

Im going to add some race gas to ensure no knock during tuning but I wanted to take it up to 24psi to get the wot tune set then back it down to about 18 unless Im at the track or something. Im just asking have people seen good longevity out of these turbos on that kinda boost. Once I get 750's and e85 it will only get worse for the turbo lol.

tabasco122 · 11-07-2011, 01:12 AM

you really shouldnt need an safc with a jwt or enthalpy tune, its usually not recommended.

s13Kurt · 11-07-2011, 05:31 PM

Quote:

Originally Posted by tabasco122

you really shouldnt need an safc with a jwt or enthalpy tune, its usually not recommended.

Well I just got back from the dyno and the tune was stupid rich pretty much everywhere. Had to pull about 25-30% WOT, and around the same doing the driveability. Its running great but not holding boost at all. It spikes 20 for a split sec and goes right back to 13-14. Made 267/310 like this. I feel its a big boost leak.

I also have a race coming up this week and a freddy intake manifold sitting in my room, and im trying to decide would it be worth the hassle to put it on and how much would it screw with the tune? I also want to know should I ditch this crappy tubular manifold and go back to the stock cast piece?

tabasco122 · 11-07-2011, 05:59 PM

Quote:

Originally Posted by s13Kurt

Well I just got back from the dyno and the tune was stupid rich pretty much everywhere. Had to pull about 25-30% WOT, and around the same doing the driveability. Its running great but not holding boost at all. It spikes 20 for a split sec and goes right back to 13-14. Made 267/310 like this. I feel its a big boost leak.

I also have a race coming up this week and a freddy intake manifold sitting in my room, and im trying to decide would it be worth the hassle to put it on and how much would it screw with the tune? I also want to know should I ditch this crappy tubular manifold and go back to the stock cast piece?

i would say you have issues elsewhere. jwt and enthalpy tunes are usually like 11:1 under WOT, they are a little rich but not much.

cotbu · 11-07-2011, 06:03 PM

Post your graph
Was this a power pull, shootout or tuning?
Tuning you should have noticed a boostleak or even inconsistent boost which would have made any tuner stop and look under the hood even if he/she not a mechanic.

Try to get base pull from like 11psi

So how many pulls did you make? And when you go back set the wastegate to 13-14psi if your running 17 + psi.

s13Kurt · 11-07-2011, 07:02 PM

Made about 16 pulls. It wasnt Inconsistent it spiked and settled the same every time. I just went to smooth the car out.

Looking at this graph I can see the car made shit power. Freddy manifold, thorough boost leak test, and adjusting the wastegate actuator, and putting the stock exhaust manifold on the car. Hope it holds 300whp and makes the same tq.

GabeS14 · 11-08-2011, 08:43 AM

Hope you guys dont mind:
havent posted in a while and dont mean to change the topic.

I am selling my full s14 sr BC stroker kit if anyone is interested: super rediculously cheap price. every part you need for block build included!

its a 2.3 lt BC kit
comes with:
-BC 91mm crank
-JE pistons (upgraded)
-1000 hp crower rods
-arp headstuds
-arp main studs
-acl main bearings
-darton sleeves

everything is WPC coated i spent $5000 on everything but Ill sell for $3000 right now

EsChassisLove · 11-11-2011, 01:17 PM

Anyone using the CIrcuit Sports 340lph fuel pump? My walbro is on its last leg and thinking about getting the CS since I'll be going for 400+rw.

Slidin' Sam · 11-13-2011, 01:09 PM

Does anybody know if the compressor housing on the s15 turbo is interchangeable with the 2871r housing? I just picked up a 2871 and it is set up with the universal housing and I want to make it direct bolt on to my current setup.

Silverbullet · 11-14-2011, 07:04 AM

the external dimentions are the same, but the inlet is smaller on the S15 turbo. I doubt the 2871R compressor wheel will fit.

http://m.facebook.com/profile.php?__..._user=68118519

One is a 2871r, other is the 28r

SLiDe_WaYz · 11-14-2011, 07:22 AM

Quote:

Originally Posted by GabeS14

Hope you guys dont mind:
havent posted in a while and dont mean to change the topic.

I am selling my full s14 sr BC stroker kit if anyone is interested: super rediculously cheap price. every part you need for block build included!

its a 2.3 lt BC kit
comes with:
-BC 91mm crank
-JE pistons (upgraded)
-1000 hp crower rods
-arp headstuds
-arp main studs
-acl main bearings
-darton sleeves

everything is WPC coated i spent $5000 on everything but Ill sell for $3000 right now

Lmfao.... You posted a for sale add in the 2871 thread, fail much?

SLiDe_WaYz · 11-14-2011, 07:24 AM

Quote:

Originally Posted by s13Kurt

Quick question guys before I go tuning this car tomorrow. Car is a simple sti injector, jwt mail order, z32, 255, and an safc. How strong are the stock timing tables? Since I dont have to remove alot of fuel the timing shouldn't be too crazy. My question is how hard can the s15 t28 be pushed?

Im going to add some race gas to ensure no knock during tuning but I wanted to take it up to 24psi to get the wot tune set then back it down to about 18 unless Im at the track or something. Im just asking have people seen good longevity out of these turbos on that kinda boost. Once I get 750's and e85 it will only get worse for the turbo lol.

The S15 turbo isn't efficient after say, 15-18psi it's just blowing hot air and possibly damaging your engine.

codyace · 11-14-2011, 10:12 PM

I think I'm in love

slider2828 · 11-14-2011, 10:19 PM

Quote:

Originally Posted by codyace

I think I'm in love

Is that a new turbo? Cause I am in line for one!!! My CHRA is blown, I wonder if the front and rear housings will work????

tabasco122 · 11-14-2011, 10:43 PM

OMFG, do want! i wanted a gtx series, but the smallest they made was the 3071. how much??

s13Kurt · 11-14-2011, 11:31 PM

People help me get to a 10.9! I work for and drive for a shop and we tested a new simple setup. This is on stock suspension and 26'' et streets. The best 60' of the day was only a 1.8 because we were playing with the tire pressures. the fastest pass of the day was an 11.6 and 120. The setup is:
Legit jdm 96 s14
stock vtc sr
stock t28
50 ish shot of nitrous (bottle pressure was terrible)
Would only hold 15-17 psi to 7k (needs to hold 20)

Do you guys think with good bottle pressure and it holding 20psi and a 1.6 60ft would net a 10.9?

anthonyr sil8ty · 11-14-2011, 11:37 PM

Quote:

Originally Posted by s13Kurt

People help me get to a 10.9! I work for and drive for a shop and we tested a new simple setup. This is on stock suspension and 26'' et streets. The best 60' of the day was only a 1.8 because we were playing with the tire pressures. the fastest pass of the day was an 11.6 and 120. The setup is:
Legit jdm 96 s14
stock vtc sr
stock t28
50 ish shot of nitrous (bottle pressure was terrible)
Would only hold 15-17 psi to 7k (needs to hold 20)

Do you guys think with good bottle pressure and it holding 20psi and a 1.6 60ft would net a 10.9?

sounds like BOOM, 20lbs on a stock t28 and a 50shot, is def not healthy

s13Kurt · 11-14-2011, 11:46 PM

Quote:

Originally Posted by anthonyr sil8ty

sounds like BOOM, 20lbs on a stock t28 and a 50shot, is def not healthy

Forgot to add this is on 100 octane. Next time out will be on e85. No detonation no boom.

anthonyr sil8ty · 11-15-2011, 12:00 AM

Quote:

Originally Posted by s13Kurt

Forgot to add this is on 100 octane. Next time out will be on e85. No detonation no boom.

no boom from being lean, but i still call death on the s14 t28 @ 20lbs.

s13Kurt · 11-15-2011, 12:27 AM

Well the car was running this same turbo on 18psi for about a year then sat for awhile now is back running on the car because of boost control issues. When checked there was no abnormal shaft play. I don't call death on the turbo. As long as there is quality oil in the car the turbo should hold that fine. The same reason my s13 made 267/310 on a t25 and is still running fine.

10-21-2011, 10:24 AM	#2222
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 49 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	^^^^Hey what hes saying^^^^ Tell jwt it's an isis mafs not an oem z32 mafs. Get your hands on an OEM z32 mafs and retest. __________________ LoverTechnologies "Half Broken Things!"

10-21-2011, 11:35 AM	#2223
BlackZenkiS14 Nissanaholic! Join Date: Nov 2003 Location: "St. Chuck", MO Age: 38 Posts: 2,094 Trader Rating: (15) Feedback Score: 15 reviews	Im going to try to do that tonight. Thanks guys. I hope I can get it figured out :/ __________________ -Kyle

10-21-2011, 03:34 PM	#2224
usdm180sx Post Whore! Join Date: Dec 2005 Location: 562 Posts: 4,807 Trader Rating: (5) Rides Gallery: usdm180sx Feedback Score: 5 reviews	Good luck. That's why I don't like mail order rom tunes. Too much waiting and paying for shipping if u gotta ship it back and you still gotta do a dyno run each time to make sure it runs right. __________________ -Norm!

10-21-2011, 04:58 PM	#2225
codyace Post Whore! Join Date: Dec 2004 Location: Poconos, PA Age: 39 Posts: 8,030 Trader Rating: (58) Feedback Score: 58 reviews	In regard to the crack and that hole on the manifold, it would be on your end (as said in PM). The cracks are actually common to the point that I've seen them on plenty of Manifolds, to include FWD ones. It becomes even more prevelent with the extrude hone process due to material removed. Having had quite a few of them this way without any issue (crack and small hole), to include my personal car, my roomates car, and many others, I wouldn't worry too much about it. With that said, if it were to crack and fall into the turbo, I don't want my words to stand as any promise/garuntee either...as I'm not any sort of engineer or materials expert. __________________ *Want Air Conditioning in your SR20 Swapped car? Check out www.sr20acbrackets.com for more information! Quest Alternator Conversions for SR20!* Check my Group Buy! Tired of lousy internal gates? Go external wastegate with one of my manifolds, Check out my group buy

10-21-2011, 11:29 PM	#2227
EsChassisLove Nissanaholic! Join Date: Jan 2011 Location: San Diego Age: 35 Posts: 2,090 Trader Rating: (26) Feedback Score: 26 reviews	That must be what the bracket on the side of the 2871 is for lol __________________ IG/TikTok-ThatS14_Z06guy

10-21-2011, 10:24 AM	#2221
Mirage Zilvia Member Join Date: Jul 2003 Location: Greenville, SC Posts: 225 Trader Rating: (7) Feedback Score: 7 reviews	I know i've read about plenty of people having similar issues when not running an actual Nissan Z32 MAF, especially over on SXOC. Maybe try to borrow a known good working MAF to try it out with. I've had sporadic AFR issues from a bad ground before, the main battery ground on the body side had loosened up due to a stripped out hole. I know you checked your MAF ground, but check out your other major ones too.

10-21-2011, 11:23 PM	#2226
Kingtal0n Post Whore! Join Date: Jul 2005 Location: South Florida Age: 41 Posts: 4,829 Trader Rating: (17) Feedback Score: 17 reviews	Many manifolds are not designed with the weight of the exhaust system/turbocharger in mind. For a given exhaust manifold, the best possible configuration is one in which the turbocharger and all of its associated hardware, including downpipe and compressor outlet, is all supported by the engine via brackets. The purpose of the exhaust manifold is to direct the exhaust gasses- NOT to support the entire weight of the exhaust system! Thats the #1 reason aftermarket manifolds fail, improper installation, i.e. improper support. Think about the twisting motion of the engine- think about how everytime you mash the pedal the manifold is being wrenched in every which direction against the weight bolted to it. There is a reason that even the factory includes a support brace for the OEM downpipe, and utilizes such a beefy casting to begin with.

10-22-2011, 03:48 AM	#2228
zurud Zilvia Junkie Join Date: Aug 2009 Location: evansville, in Posts: 391 Trader Rating: (4) Feedback Score: 4 reviews	I've never seen support brace for oem downpipe.

10-22-2011, 11:21 PM	#2229
*S14DB* AFC #1 Join Date: Oct 2003 Location: 昨晩あなたのお母さんの家 Posts: 20,181 Trader Rating: (3) Feedback Score: 3 reviews	The bracket is for the heat shield. __________________ Comments should be taken as Opinions not as Statements of Fact

10-22-2011, 11:30 PM	#2230
EsChassisLove Nissanaholic! Join Date: Jan 2011 Location: San Diego Age: 35 Posts: 2,090 Trader Rating: (26) Feedback Score: 26 reviews	WTF is a heat shield lol __________________ IG/TikTok-ThatS14_Z06guy

11-07-2011, 01:03 AM	#2231
s13Kurt Zilvia Member Join Date: May 2010 Location: georgia Posts: 224 Trader Rating: (5) Feedback Score: 5 reviews	Quick question guys before I go tuning this car tomorrow. Car is a simple sti injector, jwt mail order, z32, 255, and an safc. How strong are the stock timing tables? Since I dont have to remove alot of fuel the timing shouldn't be too crazy. My question is how hard can the s15 t28 be pushed? Im going to add some race gas to ensure no knock during tuning but I wanted to take it up to 24psi to get the wot tune set then back it down to about 18 unless Im at the track or something. Im just asking have people seen good longevity out of these turbos on that kinda boost. Once I get 750's and e85 it will only get worse for the turbo lol.

11-07-2011, 01:12 AM	#2232
tabasco122 Zilvia Junkie Join Date: Feb 2011 Location: Houma, LA Age: 35 Posts: 321 Trader Rating: (5) Feedback Score: 5 reviews	you really shouldnt need an safc with a jwt or enthalpy tune, its usually not recommended.

11-07-2011, 06:03 PM	#2235
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 49 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	Post your graph Was this a power pull, shootout or tuning? Tuning you should have noticed a boostleak or even inconsistent boost which would have made any tuner stop and look under the hood even if he/she not a mechanic. Try to get base pull from like 11psi So how many pulls did you make? And when you go back set the wastegate to 13-14psi if your running 17 + psi. __________________ LoverTechnologies "Half Broken Things!"

11-08-2011, 08:43 AM	#2237
GabeS14 Post Whore! Join Date: Dec 2005 Location: Sin City Las Vegas Posts: 4,521 Trader Rating: (27) Rides Gallery: GabeS14 Feedback Score: 27 reviews	Hope you guys dont mind: havent posted in a while and dont mean to change the topic. I am selling my full s14 sr BC stroker kit if anyone is interested: super rediculously cheap price. every part you need for block build included! its a 2.3 lt BC kit comes with: -BC 91mm crank -JE pistons (upgraded) -1000 hp crower rods -arp headstuds -arp main studs -acl main bearings -darton sleeves everything is WPC coated i spent $5000 on everything but Ill sell for $3000 right now __________________ E92 M3 19" wheels for sale///JWT Cams and Springs +30whp for sale... cheap. Last edited by GabeS14; 09-13-2016 at 08:22 AM..

11-11-2011, 01:17 PM	#2238
EsChassisLove Nissanaholic! Join Date: Jan 2011 Location: San Diego Age: 35 Posts: 2,090 Trader Rating: (26) Feedback Score: 26 reviews	Anyone using the CIrcuit Sports 340lph fuel pump? My walbro is on its last leg and thinking about getting the CS since I'll be going for 400+rw. __________________ IG/TikTok-ThatS14_Z06guy

11-13-2011, 01:09 PM	#2239
Slidin' Sam Zilvia Addict Join Date: Jul 2009 Location: Japan Posts: 729 Trader Rating: (9) Feedback Score: 9 reviews	Does anybody know if the compressor housing on the s15 turbo is interchangeable with the 2871r housing? I just picked up a 2871 and it is set up with the universal housing and I want to make it direct bolt on to my current setup. __________________

11-14-2011, 10:12 PM	#2243
codyace Post Whore! Join Date: Dec 2004 Location: Poconos, PA Age: 39 Posts: 8,030 Trader Rating: (58) Feedback Score: 58 reviews	I think I'm in love __________________ *Want Air Conditioning in your SR20 Swapped car? Check out www.sr20acbrackets.com for more information! Quest Alternator Conversions for SR20!* Check my Group Buy! Tired of lousy internal gates? Go external wastegate with one of my manifolds, Check out my group buy

11-14-2011, 10:43 PM	#2245
tabasco122 Zilvia Junkie Join Date: Feb 2011 Location: Houma, LA Age: 35 Posts: 321 Trader Rating: (5) Feedback Score: 5 reviews	OMFG, do want! i wanted a gtx series, but the smallest they made was the 3071. how much??

11-14-2011, 11:31 PM	#2246
s13Kurt Zilvia Member Join Date: May 2010 Location: georgia Posts: 224 Trader Rating: (5) Feedback Score: 5 reviews	People help me get to a 10.9! I work for and drive for a shop and we tested a new simple setup. This is on stock suspension and 26'' et streets. The best 60' of the day was only a 1.8 because we were playing with the tire pressures. the fastest pass of the day was an 11.6 and 120. The setup is: Legit jdm 96 s14 stock vtc sr stock t28 50 ish shot of nitrous (bottle pressure was terrible) Would only hold 15-17 psi to 7k (needs to hold 20) Do you guys think with good bottle pressure and it holding 20psi and a 1.6 60ft would net a 10.9?

11-15-2011, 12:27 AM	#2250
s13Kurt Zilvia Member Join Date: May 2010 Location: georgia Posts: 224 Trader Rating: (5) Feedback Score: 5 reviews	Well the car was running this same turbo on 18psi for about a year then sat for awhile now is back running on the car because of boost control issues. When checked there was no abnormal shaft play. I don't call death on the turbo. As long as there is quality oil in the car the turbo should hold that fine. The same reason my s13 made 267/310 on a t25 and is still running fine.