s14 losing boost at 5k - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

FcMURRRDA · 06-28-2012, 10:06 PM

so i just swapped my s14 sr20 and i already set the boost controller to 15psi (ecu was tuned for 15 so im leaving it that way) it makes boost but right when it makes 15 it drops all the way to 9-10 psi (around 5-5500 rpms it drops) and it flutters real bad. iv been searching and im pretty sure its the bov cause i bought a peace of shit hks ssqv from ebay (YES I KNOW IM A DUMB ASS!!!)

i just wanna see wat you guys think it is and if it is the bov, wats a good bov? iv heard those godspeed RS-SERIES 50MM V BAND are really good but i dont see to many reviews. please help me out so i can send this shit in for a tune! thanks.

xGUNKX · 06-28-2012, 10:11 PM

Get a GReddy bov thats adjustable or a bov rated to your hp range. (Guessing 275-350?)

FcMURRRDA · 06-28-2012, 10:29 PM

Quote:

Originally Posted by xGUNKX

Get a GReddy bov thats adjustable or a bov rated to your hp range. (Guessing 275-350?)

crazy, i was looking at those greddy bov just right now. im sure everyone on here are running those? any other nice bov's out there?

Flipnirish · 06-28-2012, 10:34 PM

TiAL Sport.com

Tial, FTW!

Your spring rate is going to depend on the vacuum at idle from your intake.

xGUNKX · 06-28-2012, 10:34 PM

thats what im currently running.

Does it only leak in 5th gear? or all?

*codyace* · 06-28-2012, 10:40 PM

Does it rev beyond 5500 rpm or does it hit a 'fake' rev limiter by chance?

I'd check for boost/vacuum leaks and obviously attempt to pull codes on it.

BOV wise, well...don't sort your choices by cheapest first...no one with half a clue would suggest a godspeed product as being 'good'.

AJZax · 06-28-2012, 10:53 PM

Your BOV is probably creeping open once you make power and staying open.
I have Greddy RS, I HIGHLY recommend. Buddy has the RZ and it's great too.
I'm sorry I don't know anything about the godspeed bovs :/

Test to see if it's the BOV. Fabricate a block off plate for the bov flange and plug the vacuum line going to the BOV. See if it pulls at 15psi to redline after that.

To fab block off plate, just go to lowes and get a piece of metal approximately the right size, drill 2 holes wherever necessary to bolt up to the flange, and use RTV to seal it. VOILA! Then you'll know if it's your BOV for sure or not.

(It doesn't do any REAL damage to run without BOV)
I know multiple people who've ran without them at 300+whp on KA-T and SR.
They're just a luxury, longevity/spool bonus.

Cease_Super_Hicas · 06-28-2012, 11:03 PM

What kind of boost controller do u have that might be a factor to ur problem too?

06-28-2012, 10:06 PM	#1
FcMURRRDA Leaky Injector Join Date: Sep 2007 Location: (951) Lake Elsinore/Corona Age: 26 Posts: 102 Trader Rating: (1) Feedback Score: 1 reviews	s14 losing boost at 5k so i just swapped my s14 sr20 and i already set the boost controller to 15psi (ecu was tuned for 15 so im leaving it that way) it makes boost but right when it makes 15 it drops all the way to 9-10 psi (around 5-5500 rpms it drops) and it flutters real bad. iv been searching and im pretty sure its the bov cause i bought a peace of shit hks ssqv from ebay (YES I KNOW IM A DUMB ASS!!!) i just wanna see wat you guys think it is and if it is the bov, wats a good bov? iv heard those godspeed RS-SERIES 50MM V BAND are really good but i dont see to many reviews. please help me out so i can send this shit in for a tune! thanks.

06-28-2012, 10:34 PM	#4
Flipnirish Leaky Injector Join Date: Aug 2011 Location: LV Posts: 57 Trader Rating: (0) Feedback Score: 0 reviews	TiAL Sport.com Tial, FTW! Your spring rate is going to depend on the vacuum at idle from your intake. Last edited by Flipnirish; 06-28-2012 at 10:37 PM.. Reason: added more info.

06-28-2012, 10:40 PM	#6
codyace Premium Member Join Date: Dec 2004 Location: Poconos, PA Age: 28 Posts: 6,953 Trader Rating: (50) Feedback Score: 50 reviews	Does it rev beyond 5500 rpm or does it hit a 'fake' rev limiter by chance? I'd check for boost/vacuum leaks and obviously attempt to pull codes on it. BOV wise, well...don't sort your choices by cheapest first...no one with half a clue would suggest a godspeed product as being 'good'. __________________ *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

06-28-2012, 11:03 PM	#8
Cease_Super_Hicas Zilvia Addict Join Date: Dec 2010 Location: Anaheim Age: 24 Posts: 923 Trader Rating: (30) Feedback Score: 30 reviews	What kind of boost controller do u have that might be a factor to ur problem too? __________________

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06-28-2012, 10:53 PM	#7
AJZax Leaky Injector Join Date: Feb 2012 Location: WA state Posts: 50 Trader Rating: (0) Feedback Score: 0 reviews	Your BOV is probably creeping open once you make power and staying open. I have Greddy RS, I HIGHLY recommend. Buddy has the RZ and it's great too. I'm sorry I don't know anything about the godspeed bovs :/ Test to see if it's the BOV. Fabricate a block off plate for the bov flange and plug the vacuum line going to the BOV. See if it pulls at 15psi to redline after that. To fab block off plate, just go to lowes and get a piece of metal approximately the right size, drill 2 holes wherever necessary to bolt up to the flange, and use RTV to seal it. VOILA! Then you'll know if it's your BOV for sure or not. (It doesn't do any REAL damage to run without BOV) I know multiple people who've ran without them at 300+whp on KA-T and SR. They're just a luxury, longevity/spool bonus.