how many Psi should i run? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

phi_ho1 · 11-09-2008, 08:10 PM

I just swap a red top s13 into my 93 240sx and i know stock boost run at 7 psi. my question is can i run more boost? i have some upgrade on the car. ebc, front mount, intake just a cone, eblow upgrade, downpipe and exhuast, turbo manifold, 255 fuel pump. i have wideband but can't see it so i would have to have my friend drive my car tommorow to see if it lean out or rich. my wideband reading is at 13.7 to 14 on idle now. so just wondering without a tune how many psi i can run?

*fliprayzin240sx* · 11-09-2008, 09:54 PM

46 psi...thats what everybody has been running cuz your the first person who have ever asked this damn question.

EDacIouSX · 11-09-2008, 10:01 PM

Quote:

Originally Posted by fliprayzin240sx

46 psi...thats what everybody has been running cuz your the first person who have ever asked this damn question.

friggin noob its 64. god get with the program.

uthemofo · 11-09-2008, 10:08 PM

you can run 10psi all day no problem. 12 is fine too, 14 is max, I would not pass that. And you have a wideband so just crank up the boost and watch for lean-ness.

late

*burnsauto* · 11-09-2008, 10:13 PM

after 15 psi, the t25 is out of its efficiency range.

SoguRacing · 11-09-2008, 10:13 PM

14 max with stock turbo

phi_ho1 · 11-09-2008, 10:41 PM

Quote:

Originally Posted by uthemofo

you can run 10psi all day no problem. 12 is fine too, 14 is max, I would not pass that. And you have a wideband so just crank up the boost and watch for lean-ness.

late

thank you for the infor very helpfull to me.

phi_ho1 · 11-09-2008, 10:43 PM

and what about tune? will it be ok to run 10 psi without tune?

*burnsauto* · 11-09-2008, 10:44 PM

10 is fine. hell..the stock wastegate creeps to 11. lol

phi_ho1 · 11-09-2008, 10:57 PM

ok i'll crank it up tommorow and see what up.

phi_ho1 · 11-09-2008, 10:59 PM

Quote:

Originally Posted by SoguRacing

14 max with stock turbo

hey did you ever put the new turbo in your car?

SoguRacing · 11-09-2008, 11:01 PM

yea, was getting it tuned today but ran into boost controller problems. somehow it isn't getting power.

zorak · 11-09-2008, 11:08 PM

Umm... IDK if anyone hasn't told you this, but SR20DET motors are naturally aspirated. LOL

You can't run any "PSI" at all.

zorak · 11-09-2008, 11:09 PM

Oh and your A/F is rich if its that high.

SoguRacing · 11-09-2008, 11:17 PM

actually, his afr's are just right. a higher number would indicate a lean value and lower a rich value. 14.7 is stoich so he's fine.

zorak · 11-09-2008, 11:18 PM

Oh rly?

I failed.

LOL

SoguRacing · 11-09-2008, 11:22 PM

hope the hurricanes wipe you away.

*fliprayzin240sx* · 11-10-2008, 12:26 AM

Quote:

Originally Posted by SoguRacing

actually, his afr's are just right. a higher number would indicate a lean value and lower a rich value. 14.7 is stoich so he's fine.

Sweet so at full boost at 10-14 psi, he should shoot for 14.7 since its stoich?

To the OP, if your gonna push your car to 10 psi and you have a wide band, data log it. Just so you can make sure you dont have any lean spots. Just starring at the the damn wide band gauge and looking at numbers wont give you the whole picture of what your engine is doing.

SoguRacing · 11-10-2008, 12:30 AM

Quote:

Originally Posted by fliprayzin240sx

Sweet so at full boost at 10-14 psi, he should shoot for 14.7 since its stoich?

To the OP, if your gonna push your car to 10 psi and you have a wide band, data log it. Just so you can make sure you dont have any lean spots. Just starring at the the damn wide band gauge and looking at numbers wont give you the whole picture of what your engine is doing.

he said at idle. those numbers are fine for idle.

uthemofo · 11-10-2008, 02:26 AM

yea idle is totally different than under boost. tune is completely fine for 10psi, I ran my sr like that for almost a year, getting beat on at track, daily driving, whatever, it took it fine. I almost guarantee you wont get any lean spots at 10psi, but heck, if you got the wideband data log that shit to be sure.

but most of all, you HAVE to remember, this is very important........
go have fun with more power! weeee!!!

phi_ho1 · 11-10-2008, 12:33 PM

Quote:

Originally Posted by uthemofo

yea idle is totally different than under boost. tune is completely fine for 10psi, I ran my sr like that for almost a year, getting beat on at track, daily driving, whatever, it took it fine. I almost guarantee you wont get any lean spots at 10psi, but heck, if you got the wideband data log that shit to be sure.

but most of all, you HAVE to remember, this is very important........
go have fun with more power! weeee!!!

yeah, i will do it soon

phi_ho1 · 11-10-2008, 12:35 PM

Quote:

Originally Posted by fliprayzin240sx

Sweet so at full boost at 10-14 psi, he should shoot for 14.7 since its stoich?

To the OP, if your gonna push your car to 10 psi and you have a wide band, data log it. Just so you can make sure you dont have any lean spots. Just starring at the the damn wide band gauge and looking at numbers wont give you the whole picture of what your engine is doing.

i can data log it with my laptop.

SHIFT_*grind* · 11-10-2008, 12:36 PM

Considering that stock boost with the boost solenoid (which you probably don't have unless you foraged it from a front clip) is 11 pounds, you'll be more than fine at 10.

240cracker · 11-10-2008, 12:53 PM

how much hp will u get out of 14psi with his setup?

just curious..

*slider2828* · 11-10-2008, 01:58 PM

Are you serious? he might get like 250 or the magical number 240 on the Dyno at 14PSI!! Lol....

*!Zar!* · 11-10-2008, 02:11 PM

No more than 10psi.

Don't forget the injectors start crapping out too.

SHIFT_*grind* · 11-10-2008, 02:47 PM

Quote:

Originally Posted by SHIFT_*grind*

Considering that stock boost is 11 pounds......

...........................

edit: Here's one of eight million threads on the topic. http://zilvia.net/f/tech-talk/208005...4-sr20det.html

phi_ho1 · 11-10-2008, 03:51 PM

Quote:

Originally Posted by slider2828

Are you serious? he might get like 250 or the magical number 240 on the Dyno at 14PSI!! Lol....

and how much rwhp at 10 psi?

*slider2828* · 11-10-2008, 04:19 PM

Come man.... each setup is different.... Stock 240s at 7 psi is like what 180 on a redtop... ooo another magical number? But come on these numbers are like super ball park. Cause it depends how good the motor is and bla bla bla tuning stuff like that....

14PSI come on !ZAR! DO EEETTTTT... its not like he was running 64psi on it like the first guys in the thread... That is baller status...

spikNspan · 11-10-2008, 04:59 PM

Quote:

Originally Posted by zorak

Umm... IDK if anyone hasn't told you this, but SR20DET motors are naturally aspirated. LOL

You can't run any "PSI" at all.

are you retarded?

also... stock boost is 7 pounds I don't know where you guys are coming up with 11 pounds from, but that's wrong.

11-09-2008, 08:10 PM	#1
phi_ho1 Nissanaholic! Join Date: Jun 2008 Location: CALI - OC 714 Garden Grove Posts: 1,847 Trader Rating: (57) Feedback Score: 57 reviews	how many Psi should i run? I just swap a red top s13 into my 93 240sx and i know stock boost run at 7 psi. my question is can i run more boost? i have some upgrade on the car. ebc, front mount, intake just a cone, eblow upgrade, downpipe and exhuast, turbo manifold, 255 fuel pump. i have wideband but can't see it so i would have to have my friend drive my car tommorow to see if it lean out or rich. my wideband reading is at 13.7 to 14 on idle now. so just wondering without a tune how many psi i can run? __________________ Beware for REF tickets

11-09-2008, 09:54 PM	#2
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	46 psi...thats what everybody has been running cuz your the first person who have ever asked this damn question. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

11-09-2008, 10:08 PM	#4
uthemofo Zilvia Junkie Join Date: Apr 2006 Location: san jose Posts: 425 Trader Rating: (2) Feedback Score: 2 reviews	you can run 10psi all day no problem. 12 is fine too, 14 is max, I would not pass that. And you have a wideband so just crank up the boost and watch for lean-ness. late __________________ My Feedback

11-09-2008, 10:13 PM	#5
burnsauto Premium Member Join Date: Dec 2006 Location: 717, PA Age: 35 Posts: 3,153 Trader Rating: (5) Rides Gallery: burnsauto Feedback Score: 5 reviews	after 15 psi, the t25 is out of its efficiency range. __________________

11-09-2008, 10:13 PM	#6
SoguRacing Post Whore! Join Date: Nov 2007 Location: (714) Age: 35 Posts: 2,967 Trader Rating: (23) Rides Gallery: SoguRacing Feedback Score: 23 reviews	14 max with stock turbo __________________ Pre Tune Checkup! Compression,LeakDown,Vacuum Test $80. Cams Install: $180

11-09-2008, 10:43 PM	#8
phi_ho1 Nissanaholic! Join Date: Jun 2008 Location: CALI - OC 714 Garden Grove Posts: 1,847 Trader Rating: (57) Feedback Score: 57 reviews	and what about tune? will it be ok to run 10 psi without tune? __________________ Beware for REF tickets

11-09-2008, 10:44 PM	#9
burnsauto Premium Member Join Date: Dec 2006 Location: 717, PA Age: 35 Posts: 3,153 Trader Rating: (5) Rides Gallery: burnsauto Feedback Score: 5 reviews	10 is fine. hell..the stock wastegate creeps to 11. lol __________________

11-09-2008, 10:57 PM	#10
phi_ho1 Nissanaholic! Join Date: Jun 2008 Location: CALI - OC 714 Garden Grove Posts: 1,847 Trader Rating: (57) Feedback Score: 57 reviews	ok i'll crank it up tommorow and see what up. __________________ Beware for REF tickets

11-09-2008, 11:01 PM	#12
SoguRacing Post Whore! Join Date: Nov 2007 Location: (714) Age: 35 Posts: 2,967 Trader Rating: (23) Rides Gallery: SoguRacing Feedback Score: 23 reviews	yea, was getting it tuned today but ran into boost controller problems. somehow it isn't getting power. __________________ Pre Tune Checkup! Compression,LeakDown,Vacuum Test $80. Cams Install: $180

11-09-2008, 11:08 PM	#13
zorak Zilvia Member Join Date: Oct 2008 Location: South Age: 31 Posts: 287 Trader Rating: (4) Rides Gallery: zorak Feedback Score: 4 reviews	Umm... IDK if anyone hasn't told you this, but SR20DET motors are naturally aspirated. LOL You can't run any "PSI" at all.

11-09-2008, 11:09 PM	#14
zorak Zilvia Member Join Date: Oct 2008 Location: South Age: 31 Posts: 287 Trader Rating: (4) Rides Gallery: zorak Feedback Score: 4 reviews	Oh and your A/F is rich if its that high.

11-09-2008, 11:17 PM	#15
SoguRacing Post Whore! Join Date: Nov 2007 Location: (714) Age: 35 Posts: 2,967 Trader Rating: (23) Rides Gallery: SoguRacing Feedback Score: 23 reviews	actually, his afr's are just right. a higher number would indicate a lean value and lower a rich value. 14.7 is stoich so he's fine. __________________ Pre Tune Checkup! Compression,LeakDown,Vacuum Test $80. Cams Install: $180

11-09-2008, 11:18 PM	#16
zorak Zilvia Member Join Date: Oct 2008 Location: South Age: 31 Posts: 287 Trader Rating: (4) Rides Gallery: zorak Feedback Score: 4 reviews	Oh rly? I failed. LOL

11-09-2008, 11:22 PM	#17
SoguRacing Post Whore! Join Date: Nov 2007 Location: (714) Age: 35 Posts: 2,967 Trader Rating: (23) Rides Gallery: SoguRacing Feedback Score: 23 reviews	hope the hurricanes wipe you away. __________________ Pre Tune Checkup! Compression,LeakDown,Vacuum Test $80. Cams Install: $180

11-10-2008, 02:26 AM	#20
uthemofo Zilvia Junkie Join Date: Apr 2006 Location: san jose Posts: 425 Trader Rating: (2) Feedback Score: 2 reviews	yea idle is totally different than under boost. tune is completely fine for 10psi, I ran my sr like that for almost a year, getting beat on at track, daily driving, whatever, it took it fine. I almost guarantee you wont get any lean spots at 10psi, but heck, if you got the wideband data log that shit to be sure. but most of all, you HAVE to remember, this is very important........ go have fun with more power! weeee!!! __________________ My Feedback

11-10-2008, 12:53 PM	#24
240cracker Zilvia FREAK! Join Date: Dec 2007 Location: OC/LA ~ 90631 Posts: 1,485 Trader Rating: (22) Rides Gallery: 240cracker Feedback Score: 22 reviews	how much hp will u get out of 14psi with his setup? just curious..

11-10-2008, 01:58 PM	#25
slider2828 Premium Member Join Date: Oct 2004 Location: San Francisco, CA Posts: 5,824 Trader Rating: (13) Feedback Score: 13 reviews	Are you serious? he might get like 250 or the magical number 240 on the Dyno at 14PSI!! Lol.... __________________ Turn and Burn!

11-10-2008, 02:11 PM	#26
!Zar! Premium Member Join Date: Nov 2004 Location: North Korea Posts: 14,576 Trader Rating: (27) Feedback Score: 27 reviews	No more than 10psi. Don't forget the injectors start crapping out too. __________________

11-10-2008, 04:19 PM	#29
slider2828 Premium Member Join Date: Oct 2004 Location: San Francisco, CA Posts: 5,824 Trader Rating: (13) Feedback Score: 13 reviews	Come man.... each setup is different.... Stock 240s at 7 psi is like what 180 on a redtop... ooo another magical number? But come on these numbers are like super ball park. Cause it depends how good the motor is and bla bla bla tuning stuff like that.... 14PSI come on !ZAR! DO EEETTTTT... its not like he was running 64psi on it like the first guys in the thread... That is baller status... __________________ Turn and Burn!

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