MAXXX Boost on a T25 setup ? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

bl200sx · 04-06-2003, 09:28 PM

Ok, this is my setup as of now, s13 sr20 det T25 w /stock SMIC, plus I have a 255 walbro fuel pump, how much boost is safe on this setup before detination.

Thanks

Sleeping240 · 04-06-2003, 09:32 PM

i would only run around 10 psi, but thats me. The T25 can handle up to 15 pounds of boost but any further and its past its efficiency range.

Infamous · 04-06-2003, 09:34 PM

no more than 14-15 PSI, i dunno the barage on that

*Jeff240sx* · 04-06-2003, 09:48 PM

Quote:

Originally posted by Infamous
no more than 14-15 PSI, i dunno the barage on that

1 bar = 14.5psi.
-Jeff

DuffMan · 04-06-2003, 09:55 PM

10-12 would be safe. 12-15 might not detonate, but then again it might.

bl200sx · 04-06-2003, 10:15 PM

I was thinking the fuel system would be ok for max boost, but the SMIC would be to small for max boost on the T25, and a lot depends on how hot it is that day.

nrcooled · 04-07-2003, 04:10 AM

I ran 14lbs on my completely stock setup w/ no problems. Just don't do it in the summer. while it's cool out have fun but not in the heat

DMC · 04-07-2003, 06:07 AM

hey nrcooled do you live in norfolf va?

nrcooled · 04-07-2003, 06:32 AM

Quote:

Originally posted by DMC
hey nrcooled do you live in norfolf va?

I live in Northern Virginia (Norf Verginny) it's a not so funny joke.

uiuc240 · 04-07-2003, 08:35 AM

mmm...12-14 psi. Sounds nice. I think I need to invest in something to turn up the wick.

Since this thread sucks, imma jack it. Any opinions on boost controllers? Yes, I've read a LOT about them. I'm leaning towards the Greddy Profec B for ease of tuning, but the AVC-R would match an S-AFC so nicely. And then there's the super-cool Blitz SBC-iD. Or go cheap and just make/buy an MBC.

Thoughts?

Eric

nrcooled · 04-07-2003, 09:21 AM

Quote:

Originally posted by uiuc240
mmm...12-14 psi. Sounds nice. I think I need to invest in something to turn up the wick.

Since this thread sucks, imma jack it. Any opinions on boost controllers? Yes, I've read a LOT about them. I'm leaning towards the Greddy Profec B for ease of tuning, but the AVC-R would match an S-AFC so nicely. And then there's the super-cool Blitz SBC-iD. Or go cheap and just make/buy an MBC.

Thoughts?

Eric

Go on ebay and do a seller search for "Japandy" he sells boost controllers (JDM too

) used pretty cheap. Just keep looking on ebay. Buying a BC new is ghey and unnecessarilly expensive. Used is the way to go.

Foxcolt · 04-07-2003, 09:29 AM

Quote:

Originally posted by uiuc240
mmm...12-14 psi. Sounds nice. I think I need to invest in something to turn up the wick.

Since this thread sucks, imma jack it. Any opinions on boost controllers? Yes, I've read a LOT about them. I'm leaning towards the Greddy Profec B for ease of tuning, but the AVC-R would match an S-AFC so nicely. And then there's the super-cool Blitz SBC-iD. Or go cheap and just make/buy an MBC.

Thoughts?

Eric

I've pretty much messed with every boost controller on the market so I'll give you a quick rundown.

AVC-R cool because of it's monitoring functions..that's the best part about the controller. other than that self learn mode is a focking joke but once you get it tuned right it holds good boost.

Blitz newer It's a neat looking little gadget. Installation is a breeze (installed in friends car) and tuning it is also simple. Only down side is it costs as much as the AVC-R and doesn't have any of the monitoring functions.

Greddy profec: meh..fuzzy logic sucks nuff said. I'd reccomend looking into the NEW greddy..that one looks cool!

That's all I can think of. on to MBC's!!

a good friend runs a manual boost controller. Bottom line it's the best way to go since all the pretty electronic boost controllers lose their novelty after a while.

I just installed an HKS actuator with my new turbo. I'm very impressed. It holds boost better than any boost controller I've seen yet. for 65 bucks new I think it's the best way to go for a t25 setup!

Hope this helps
Jed

Infamous · 04-07-2003, 02:15 PM

Quote:

Originally posted by Jeff240sx
1 bar = 14.5psi.
-Jeff

cool. you know where can i find a bar chart, i dont want to go to google

Wiisass · 04-07-2003, 02:43 PM

Quote:

Originally posted by Infamous
cool. you know where can i find a bar chart, i dont want to go to google

That's pretty lazy man. Besides, jeff was a little off.
1 bar = 14.7 psi.
that's really all you need to know. i mean unless you don't want to go and use a calculator or anything. but seriously it's a simple ratio.

if you have psi and you want bar, just divide by 14.7
if you have bar and you want psi, multiply by 14.7

Tim

*HaLo* · 04-07-2003, 02:46 PM

Hum... I wouldn't recommend going over 10 psi with the stock SMIC!!!

s13sr20 · 04-07-2003, 06:36 PM

There's nothing wrong with going over 10psi on a sidemount, it just won't be as efficient...it's not going to detonate under 15psi.

KiDyNomiTe · 04-07-2003, 06:49 PM

Quote:

That's pretty lazy man. Besides, jeff was a little off.
1 bar = 14.7 psi.
that's really all you need to know. i mean unless you don't want to go and use a calculator or anything. but seriously it's a simple ratio.

if you have psi and you want bar, just divide by 14.7
if you have bar and you want psi, multiply by 14.7

Tim

Look at the pic Jeff was closer than you

DuffMan · 04-07-2003, 08:13 PM

Yeah, i think it's 14.7psi = 1 ATM. ATM's and bars aren't quite the same. And then there's Kg/mm just to make it more difficult on ya.

Wiisass · 04-07-2003, 08:45 PM

Alright, I'm wrong, i admit it. I guess I just thought everyone refered to 1 bar as 14.7psi. but like Duffman said that's atm's. And all along I thought
1 bar = 1atm = 1 kg/cm^2 = 760mmHG = 14.7 psi
but it's just
1atm = 760mmHG = 14.7 psi
all the other ones are a little off, so Jeff was closer with 14.5 psi = 1 bar.
but everything else i said is still true, in respect to figuring out bars and pounds per square inch.
Take a look at this page, all conversions

Tim

SRKperformance · 04-08-2003, 02:24 PM

the hks actuator wont allow you to hold more than around .80-.88 bar however. I am using an avcr on my upgraded t25/t28 turbo at 1 bar with 370s stock ecu and a nismo fpr on 91 with octane boosetr for daily. I would go with 14.5 psi of boost with a nismo fpr. I would set the fpr at 45 psi at idle and you should be safe. It will increse the amount of fuel being pushed thru your injectors every pulse thus a little more fuel. you should be find at 1 bar on stock turbo. It looses efficency after that anyways. Mine loses effiecency at 18.5 psi thats why i like it.

**Phlip** · 04-08-2003, 05:22 PM

Quote:

Originally posted by KiDyNomiTe
Look at the pic Jeff was closer than you

Actually, I wasn't going to nit-pick as I went down the thread, but the aviation mechanics handbook I have for school lists 1 bar at 14.7, as had everything I saw before that chart you posted... Not looking to start a ****ing contest, but where did you get it?

Quote:

Originally posted by SRKperformance
the hks actuator wont allow you to hold more than around .80-.88 bar however.

Steeles is running the HKS actuator at 14 pounds, no issues, that .80-.88 is a little off methinks...

Jsquared · 04-08-2003, 05:50 PM

i also know someone with an HKS wastegate actuator running 14psi on a T25...

*sykikchimp* · 04-08-2003, 05:54 PM

onlineconversion.com says 1 bar = 14.503774 lbf/square inch (PSI)

Wiisass · 04-08-2003, 06:25 PM

Look at the link I posted before. It's got all the conversions. Boost is measured in a bunch of different ways, ie bar, psi, kg/cm^2. And they are all slightly different. like i always thought 1 bar = 1 kg/cm^2 = 14.7psi, but from everything i found when i was looking for it proved me wrong.

well here's page again, conversions
and if you don't believe that one try this

Tim

Steeles · 04-09-2003, 07:31 AM

Quote:

Originally posted by PHLIP
Steeles is running the HKS actuator at 14 pounds, no issues, that .80-.88 is a little off methinks...

actually its at 15psi with no problems

Foxcolt · 04-09-2003, 08:50 AM

Quote:

Originally posted by James
Where'd ya buy it?

Mine came with the turbo.

I'm sure most of our familiar 240 shops can get it. Just call around I'm sure at least one of em has one in stock.

**Phlip** · 04-09-2003, 05:07 PM

Quote:

Originally posted by Steeles
actually its at 15psi with no problems

Yeah, 15...

KiDyNomiTe · 04-09-2003, 06:10 PM

Quote:

Originally posted by PHLIP
Actually, I wasn't going to nit-pick as I went down the thread, but the aviation mechanics handbook I have for school lists 1 bar at 14.7, as had everything I saw before that chart you posted... Not looking to start a ****ing contest, but where did you get it?

I remember getting it off of Supra Forums, but you know how things on forums are, they spread like herpes at a college frat party

But I guess someone scanned it, and I juss saved it for future reference

**Phlip** · 04-10-2003, 02:33 PM

Quote:

Originally posted by KiDyNomiTe
I remember getting it off of Supra Forums, but you know how things on forums are, they spread like herpes at a college frat party

But I guess someone scanned it, and I juss saved it for future reference

LOL @ the forum STD...

jdmrice · 04-10-2003, 03:55 PM

you can buy the Hks acturator at www.jspec.com or phase2motortrend.com..

stock fuel deliever system (370c.c.) only safe to boost around 10 psi but can be push to 12psi making about 220-230 at the wheel

even with the hks act. upgrade and 555c.c. injetors...T25 only efficient to run around 1 to 1.1 bar and makes about 240 rwhp...

i had a T25 turbo bore out to T28..with 265 in/exh cams i made about 260 at the wheel...similar set up with a S14BB turbo made 270rwhp but with a faster spool compare to my midifided turbo..

every number is comfirmed on a dyno jet tuned at XS engineering with power FC
just to give u guys an idea

Richard

04-06-2003, 09:28 PM	#1
bl200sx Leaky Injector Join Date: Jan 2003 Location: Asheville,NC Posts: 83 Trader Rating: (0) Feedback Score: 0 reviews	MAXXX Boost on a T25 setup ? Ok, this is my setup as of now, s13 sr20 det T25 w /stock SMIC, plus I have a 255 walbro fuel pump, how much boost is safe on this setup before detination. Thanks

04-06-2003, 09:34 PM	#3
Infamous Join Date: Apr 2003 Location: LI.NY Age: 37 Posts: 26 Trader Rating: (0) Feedback Score: 0 reviews	no more than 14-15 PSI, i dunno the barage on that __________________ .www.SR20DET.tk .www.KA24DET.tk

04-07-2003, 04:10 AM	#7
nrcooled Nissanaholic! Join Date: Mar 2002 Location: Turn 8 'bout to get rolled by a SC'd ITR Age: 45 Posts: 1,849 Trader Rating: (0) Feedback Score: 0 reviews	I ran 14lbs on my completely stock setup w/ no problems. Just don't do it in the summer. while it's cool out have fun but not in the heat __________________ '91 hatch w/ SR Sold; '03 Evo Sold 401 HP; '03 MS Protege sold; '00 Evo 6.5 TME Sold 300HP

04-07-2003, 08:35 AM	#10
uiuc240 Nissanaholic! Join Date: Apr 2002 Location: Naperville, IL Age: 45 Posts: 2,093 Trader Rating: (0) Feedback Score: 0 reviews	mmm...12-14 psi. Sounds nice. I think I need to invest in something to turn up the wick. Since this thread sucks, imma jack it. Any opinions on boost controllers? Yes, I've read a LOT about them. I'm leaning towards the Greddy Profec B for ease of tuning, but the AVC-R would match an S-AFC so nicely. And then there's the super-cool Blitz SBC-iD. Or go cheap and just make/buy an MBC. Thoughts? Eric __________________ 2002 Mazda Protege5 1989 S13 w/SR20DET (sold)

04-07-2003, 02:46 PM	#15
HaLo from Canada, eh! Join Date: Sep 2001 Location: Montreal, Quebec Age: 45 Posts: 5,201 Trader Rating: (0) Rides Gallery: HaLo Feedback Score: 0 reviews	Hum... I wouldn't recommend going over 10 psi with the stock SMIC!!! __________________ -> HaLo Race Car: '98 E36 BMW M3 Daily Drivers: '23 Audi Q4 e-tron & '13 VW Touareg SOLD: 01 GPW Honda S2000 PARTED: 93 Pearl White 240SX LE Fastback w/SR20DET SOLD: 93 Super White 240SX SE Convertible w/Silvia Front

04-06-2003, 09:32 PM	#2
Sleeping240 Zilvia Member Join Date: Jan 2003 Location: Orange park, FL Posts: 190 Trader Rating: (0) Feedback Score: 0 reviews	i would only run around 10 psi, but thats me. The T25 can handle up to 15 pounds of boost but any further and its past its efficiency range.

04-06-2003, 09:55 PM	#5
DuffMan Post Whore! Join Date: Oct 2001 Location: in a cardboard box Posts: 2,517 Trader Rating: (0) Feedback Score: 0 reviews	10-12 would be safe. 12-15 might not detonate, but then again it might.

04-06-2003, 10:15 PM	#6
bl200sx Leaky Injector Join Date: Jan 2003 Location: Asheville,NC Posts: 83 Trader Rating: (0) Feedback Score: 0 reviews	I was thinking the fuel system would be ok for max boost, but the SMIC would be to small for max boost on the T25, and a lot depends on how hot it is that day.

04-07-2003, 06:07 AM	#8
DMC Zilvia Addict Join Date: Jan 2003 Location: Chesapeake, Va Posts: 609 Trader Rating: (0) Feedback Score: 0 reviews	hey nrcooled do you live in norfolf va?

04-07-2003, 06:36 PM	#16
s13sr20 Join Date: Jan 2002 Posts: 34 Trader Rating: (0) Feedback Score: 0 reviews	There's nothing wrong with going over 10psi on a sidemount, it just won't be as efficient...it's not going to detonate under 15psi.

04-07-2003, 08:13 PM	#18
DuffMan Post Whore! Join Date: Oct 2001 Location: in a cardboard box Posts: 2,517 Trader Rating: (0) Feedback Score: 0 reviews	Yeah, i think it's 14.7psi = 1 ATM. ATM's and bars aren't quite the same. And then there's Kg/mm just to make it more difficult on ya.

04-07-2003, 08:45 PM	#19
Wiisass Zilvia Junkie Join Date: Aug 2002 Location: Philly Posts: 486 Trader Rating: (0) Feedback Score: 0 reviews	Alright, I'm wrong, i admit it. I guess I just thought everyone refered to 1 bar as 14.7psi. but like Duffman said that's atm's. And all along I thought 1 bar = 1atm = 1 kg/cm^2 = 760mmHG = 14.7 psi but it's just 1atm = 760mmHG = 14.7 psi all the other ones are a little off, so Jeff was closer with 14.5 psi = 1 bar. but everything else i said is still true, in respect to figuring out bars and pounds per square inch. Take a look at this page, all conversions Tim __________________ TIP Engineering R/T Tuning Drift and RWD Sport DriftAssNation

04-08-2003, 02:24 PM	#20
SRKperformance BANNED Join Date: Jan 2003 Location: Long Beach, CA Age: 39 Posts: 250 Trader Rating: (0) Feedback Score: 0 reviews	the hks actuator wont allow you to hold more than around .80-.88 bar however. I am using an avcr on my upgraded t25/t28 turbo at 1 bar with 370s stock ecu and a nismo fpr on 91 with octane boosetr for daily. I would go with 14.5 psi of boost with a nismo fpr. I would set the fpr at 45 psi at idle and you should be safe. It will increse the amount of fuel being pushed thru your injectors every pulse thus a little more fuel. you should be find at 1 bar on stock turbo. It looses efficency after that anyways. Mine loses effiecency at 18.5 psi thats why i like it.

04-08-2003, 05:50 PM	#22
Jsquared Zilvia Junkie Join Date: Feb 2003 Location: Raleigh, NC//Charlotte, NC Age: 41 Posts: 503 Trader Rating: (0) Feedback Score: 0 reviews	i also know someone with an HKS wastegate actuator running 14psi on a T25...

04-08-2003, 05:54 PM	#23
sykikchimp WOW addicted Join Date: Dec 2001 Location: the moon Age: 43 Posts: 6,525 Trader Rating: (0) Feedback Score: 0 reviews	onlineconversion.com says 1 bar = 14.503774 lbf/square inch (PSI) __________________

04-08-2003, 06:25 PM	#24
Wiisass Zilvia Junkie Join Date: Aug 2002 Location: Philly Posts: 486 Trader Rating: (0) Feedback Score: 0 reviews	Look at the link I posted before. It's got all the conversions. Boost is measured in a bunch of different ways, ie bar, psi, kg/cm^2. And they are all slightly different. like i always thought 1 bar = 1 kg/cm^2 = 14.7psi, but from everything i found when i was looking for it proved me wrong. well here's page again, conversions and if you don't believe that one try this Tim __________________ TIP Engineering R/T Tuning Drift and RWD Sport DriftAssNation

04-10-2003, 03:55 PM	#30
jdmrice Join Date: Feb 2003 Location: Hacienda Hts, CA Posts: 36 Trader Rating: (0) Feedback Score: 0 reviews	you can buy the Hks acturator at www.jspec.com or phase2motortrend.com.. stock fuel deliever system (370c.c.) only safe to boost around 10 psi but can be push to 12psi making about 220-230 at the wheel even with the hks act. upgrade and 555c.c. injetors...T25 only efficient to run around 1 to 1.1 bar and makes about 240 rwhp... i had a T25 turbo bore out to T28..with 265 in/exh cams i made about 260 at the wheel...similar set up with a S14BB turbo made 270rwhp but with a faster spool compare to my midifided turbo.. every number is comfirmed on a dyno jet tuned at XS engineering with power FC just to give u guys an idea Richard