How much boost is OK?

[Gmans13]

Hey guys I just got my boost gauge/controller all hooked up today and I set the boost to about 11psi is this too much for the smic/turbo. Just don't wana fry that thing too quick:icesangel

[badass240sx]

More info on your setup bro. You all stock and just a boost controller? Any fuel management / tuning?

[BuudWeizErr]

Turn it down or get a front mount. The side mount IC sucks. You won't hurt the turbo yet, but I'm sure you are going to hurt something else when you start detonating.

If you must run that much boost through the stock intercooler, you better have something better than 91 octane.

[solaris22]

the SR20's stock boost is .7 bar which is 10psi so why would 11psi be too much? Granted jap gas is over 100 octane, but still...

[S13240]

Yours is 10 psi huh? Mine only shows 7 psi. And Japan's gas octane rating is different from ours. But I'm running 13 psi on my stock smic and stock bypass valve on stock fuel system besides walbro fuel pump upgrade and running great. If dsms can do it...so can nissan!

[BuudWeizErr]

SR20 stock boost is .5 bar, or 7 psi. You have raised the boost 4 pounds on something that barely even works that great at stock boost.

And JDM fuel is not that much better than our fuel.

[Cyberkreig]

Again, JDM fuel is not different than our fuel, only rated differently. search RONMONPON

[TruboostPerformance]

JDM is 100 octane if you ask for it, some places carry 103 octane, just bought some the other night in a friends 180sx

[SpeedRacer1]

Japanese 100 Octane is not equal to 100 Octane in the US.

[TruboostPerformance]

also, most of these guys are running .7 to .9 bar on stock stuff, with exhuast and intake and stock intercooler...

[B.L]

I agree that the smic is crap but.....

you can run .9 bar on it with no probsMy car was running 1.1 bar on the smic for 2 years(previous owner),i've turned it back to .85 bar setting A and 1 bar setting B with boostcontroller.

I know lots of people running upto 1 bar on the smic with no problems.But then again i also now people who got a cracked smic while running stock boost(stock boost in Europe is 0.5 bar)

[titotonto]

There's a couple of guys here (in hot *** Arizona)that run 12 p.s.i with stock smic with no problem,I don't know where this detonation or "hurting" the turboargument came from, probably from something somebodyheard.

[hokiruu]

Sorry to thread jack a bit but its sort of reltaed...I have asked this question before, but I still want more opinions.s14 SR20DET w/ bb t28, FMIC, dp, exhst, straight pipe, Tomei fp etc.How much boost can I run safely?

[Cyberkreig]

Looks like your limited by fuel and tuning Hokiruu. I remember reading that you can increase boost apox 20% on stock fuel system. I'll try to hunt around to source myself.

No. I know that isnt right. its that you can increase fuel injector duity 20%. again, lemme look aroudn see if i can find where i read this.

[B.L]

Sorry to thread jack a bit but its sort of reltaed...I have asked this question before, but I still want more opinions.s14 SR20DET w/ bb t28, FMIC, dp, exhst, straight pipe, Tomei fp etc.How much boost can I run safely?

Well the t28 in Europe is not BB:( the absolute limit of our t28 is 1.2 bar!

I know you can run 1.2 bar with the 370cc's but you need to increase your fuel pressur alot so its not really recommended.1 bar is pretty safe lots of people do it with no problems.(me included)

[badass240sx]

I have a similar setup as hokiru, S14 SR20DET w/ bb t28, SMIC, DP, Exhaust, Walbro FP, HKS Intake pretty much stock setup...I was curious how much I could safely raise the boost without tuning, injectors, or an S-AFC just yet. Basically I want to get a boost controller and raise to around 8-9PSI, will it be alright? I'm only boosting 5psi with a spike to 6psi sometimes and it sucks bigtime.

[hokiruu]

I have a similar setup as hokiru, S14 SR20DET w/ bb t28, SMIC, DP, Exhaust, Walbro FP, HKS Intake pretty much stock setup...I was curious how much I could safely raise the boost without tuning, injectors, or an S-AFC just yet. Basically I want to get a boost controller and raise to around 8-9PSI, will it be alright? I'm only boosting 5psi with a spike to 6psi sometimes and it sucks bigtime.

Hmm something doesn't ound right about that, especially those spikes. Why are you running 5psi? That is below stock boost. I'm sure you knw that though. I think you need a FMIC at least for now.

[badass240sx]

Yeah I have no idea why it's only boosting 5psi...I shouldn't really say it spikes to 6-6.5psi, it's more when I floor it suddenly in 3'rd. I know stock is 7.5psi but I thought it was controlled by the actuator which is set for 7.5 - didn't know you could adjust it to only run 5-6? Anyway, so it wouldn't be a good idea to get a boost controller and bump it up to atleast 8psi without anything else?

[kimchixboi]

the SR20's stock boost is .7 bar which is 10psi so why would 11psi be too much? Granted jap gas is over 100 octane, but still...

the sr20 stock psi is set at 7psibut anyways the sr20 was built to handle 1 bar(14.48psi) but just to be on the safe side tune your engine before you put it up that high i.e,. injectors,pistons, etc...

[SpeedRacer1]

Hmm something doesn't ound right about that, especially those spikes. Why are you running 5psi? That is below stock boost. I'm sure you knw that though. I think you need a FMIC at least for now.

Perhaps hes running some Australian parts? The Aussie 200SX's run 5psi of boost.

[BuudWeizErr]

the sr20 stock psi is set at 7psibut anyways the sr20 was built to handle 1 bar(14.48psi) but just to be on the safe side tune your engine before you put it up that high i.e,. injectors,pistons, etc...

YOU DO NOT NEED TO CHANGE PISTONS TO MAKE THE SR HANDLE 1 BAR OF BOOST.

[RobDET]

WORD!

[badass240sx]

Buud, you beat me to it - lol. SpeedRacer, as far as I can tell im not using any Aussie parts, but who knows. I bought the clip from Neishlin (Day or two before the nasty thread started on the boards, figures..lol) I'm ordering an S-AFC II and GReddy Profec-B today, so no worries I hope.

[B.L]

Arent you guys confusing psi with bar here

isnt stock boost in Japan 0.7bar (10psi)The rest of us Eur,Aus,etc have 0.5bar (7psi)

[harryhood]

B.L, no, stock boost in japan is .5 bar or 7 psi as someone stated many times before. don't know about the others though

[SpeedRacer1]

Skyline GTR's = 0.7 BarZ32 TT's = 0.7 Bar?JDM S13-S15 SR's = 0.5 BarEurope = ?!?!?!Australian S15's somehow manage to run around 200hp as opposed to the 247 of the JDM counterpart, so I assume the boost is probably lower around 0.4BarNew Zealand S15 SR's = 0.7 Bar

[hokiruu]

Buud, you beat me to it - lol. SpeedRacer, as far as I can tell im not using any Aussie parts, but who knows. I bought the clip from Neishlin (Day or two before the nasty thread started on the boards, figures..lol) I'm ordering an S-AFC II and GReddy Profec-B today, so no worries I hope.

LOL. I also bought my engine literally 2 day before that thread began. So far so good though, Neishlin has been very good and helpful. It's not nearly over though, so we'll see I guess.

[makoto3838]

im not sure if it got answered later on, but 100 octane in japan is equaled to 94 or 95 octane in the US. so its still slightly better

[B.L]

http://www.200sx.org/faq_2.html