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| View Poll Results: Where would you mount your blow off valve? | |||
| On the cold pipe, near to the throttle body |
   
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42 | 61.76% |
| On the charged pipe, nearest the compressor |
  
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20 | 29.41% |
| what is a BOV? |
  
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6 | 8.82% |
| Voters: 68. You may not vote on this poll | |||
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11-14-2006, 09:15 PM
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#31 |
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Post Whore!
 
Join Date: Apr 2004
Location: Virginia, USA
Posts: 5,764
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Luke's point is that you don't lose as much pressure across the intercooler if you're running low boost. If you vent at the coldpipe, the intercooler loses pressure more quickly because air goes through the intercooler and out the BOV. When you start boosting again, it takes time to fully pressurize the IC.
If you vent at the hotpipe, you will lose less pressure across the IC because air is less likely to go backward across the IC to the hotpipe. When you start boosting again, the IC will still be charged slightly, leading to better throttle response. What I've noticed is that with a huge FMIC and a tiny T25, the T25 feels laggier and runs out of breath more quickly than the SMIC. It's not until you get to higher speeds where the FMIC's superior cooling starts paying off. |
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11-14-2006, 09:47 PM
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#33 | |
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Post Whore!
 
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Quote:
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11-14-2006, 10:20 PM
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#34 | |
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Post Whore!
Join Date: Apr 2004
Location: Virginia, USA
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Quote:
Ask Luke if you want to get nitty gritty. As far as ICs go, I would NOT be comfortable going into the teens with a sidemount. I don't think the tiny little sidemount can handle that much boost. |
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11-15-2006, 09:36 AM
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#35 |
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Post Whore!
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Well I have the Greddy V-SPL and plan on going with an S15 T28 or even the GT2871R, and am after throttle response.
What's recommended in that sense? Right now I have the BOV on the hotpipe, T25 @ 10psi (was 14psi but it's getting cooler out, backed off the boost just in case it spikes), and so far the boost response isn't that bad... |
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11-15-2006, 12:51 PM
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#36 |
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Zilvia FREAK!
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ive heard from tons of people that cold pipe is ideal.. and when u look at many race cars that are turbo'd, there it is again on the cold pipe.. for instant response, go with a Tomei Expreme exhaust manifold. the response with this exhaust manifold is absolutely amazing.. oh.. btw.. s14 sr, blitz fmic, stock t28, mr dp, mr outlet, 2.5 cat delete 80mm apexi dual. equal length makes more power, tomei expreme ass load of response.. i build 1.1 lbs. cranking the engine...
-Bart |
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11-15-2006, 02:01 PM
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#37 |
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Post Whore!
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^^ Is your boost gauge accurate?
I mean... all the gauges usually are not in fully operational state when you first crank your car. |
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11-16-2006, 05:03 PM
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#39 |
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Zilvia Junkie
 
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Based off of what Luke stated you can also view hot side mounting like this; when the pressure is relieved at the compressor the purge is only monentary and then the throttle is opened again to whatever degree is desired, this means that the compressor is still spinning and will be right there to push the remaining charged air that was sitting in the cold pipe and IC during release straight back into the plenum without any gap to be filled inbetween the throttle plate and IC. What I am trying to illustrate with words is that the air will be left right at the throttle when the air is purged at the compressor. To me this would seem to provide a quicker response in theory.
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Florida shut the fuck up. |
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11-16-2006, 05:05 PM
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#40 |
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Post Whore!
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If you have a ball bearing turbo then boost response is gonna be pretty amazing no matter where you put the BOV man
 Just put it on the intercooler like WRC teams do lol Right dab smack in the middle, nothing to worry about  |
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11-17-2006, 06:22 AM
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#42 | |
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Post Whore!
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Quote:
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11-17-2006, 09:11 PM
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#43 |
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Zilvia Addict
 3ef6.jpg?u=41132&dateline=1270086665){kind=small}
Join Date: Nov 2005
Location: Downingtown, PA
Posts: 890
Trader Rating: (5)
Feedback Score: 5 reviews
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stock evo mr bov on cold pipe recirculated for s15 SR stock boost and sometimes 12psi. works wonders and engine runs as smooth as a babies bum and it cost me 15 bucks
had a ssqv and that shit made compressor surge and was vented to the atmosphere...made my engine run like crap <- $200 bovs are overrated imo EVO MR bov FTW!!!
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11-18-2006, 05:28 PM
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#44 |
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No more nissan.
Join Date: Jan 2003
Location: RAIN, Washington.
Age: 36
Posts: 8,132
Trader Rating: (10)
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Well its on the cold pipe. I couldn't resist.
I like it.. alot. No stall on decell.. no complete richness coming up to a stop light.. hella more predictable and the car just runs soo much more smoothely.. Still a few issues.. but at least I'm making progress!
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11-18-2006, 05:39 PM
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#45 |
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Nissanaholic!
 
Join Date: Aug 2003
Location: Los Angeles/Berkeley, CA
Posts: 2,238
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pictures, bitch!
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Petition Nissan to Make the IDx on http://IDxClub.co ! |
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11-18-2006, 07:43 PM
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#47 |
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Nissanaholic!
Join Date: Oct 2006
Location: Philaburbia
Age: 43
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if its there you wont get as much compressor surging (at least on my car it went away - but i also changed to a tial BOV. the old bov wasnt opening long enough - it was like chhuuuuurgupbooop boooop boooop booop boop boo. now its just pshoooooooootuh boop. i have a holset. and teh best sound - is with no bov (booooop booop boop boop boooo
 ) but im told my turbo will get beat up - not that i care that much tho. |
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11-20-2006, 12:15 AM
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#49 |
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No more nissan.
Join Date: Jan 2003
Location: RAIN, Washington.
Age: 36
Posts: 8,132
Trader Rating: (10)
Feedback Score: 10 reviews
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Yah man, thanks for the recommendation. I still am having some electrical related issues though.. I'm gonna try swapping my MAFS with someone elses, gonna try to throw back in the 370s.. and a few other things like a grounding kit and such.
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11-20-2006, 12:28 AM
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#50 |
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Post Whore!
Join Date: Dec 2002
Location: Campbell, Ca
Age: 38
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I would consider hitting your maf with some brake cleaner before you swap it out.
Also remember how your car had a grounding problem. That could cause it too. try replacing the main ground cable and cleaning the contact area. Let me know when you get a ems.
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11-20-2006, 02:31 AM
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#51 |
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Nissanaholic!
Join Date: Aug 2003
Location: Los Angeles/Berkeley, CA
Posts: 2,238
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Feedback Score: 1 reviews
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lol don't even wanna try the biki huh
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Petition Nissan to Make the IDx on http://IDxClub.co ! |
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11-20-2006, 01:20 PM
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#52 |
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No more nissan.
Join Date: Jan 2003
Location: RAIN, Washington.
Age: 36
Posts: 8,132
Trader Rating: (10)
Feedback Score: 10 reviews
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^Nobody does!! Not the shop before either.. haha
Yah Luke, I don't know how to find the grounding problem though.. I did the fuel pump hard wire with 12 guage wiring.. so its not the fuel pump starving.. I'm gonna ground the MAFS, intake mani, block and go from there.. I guess.
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11-21-2006, 08:48 PM
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#55 | |
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Post Whore!
Join Date: Jun 2004
Location: Eagle Rock, CA
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Quote:
Yeah I noticed I was just putting my 2 cents in mine is there because of recirc but for non recirc I dont think it matters. I dont think there is more response either way. Its a pressurized system and if you are releasing to atmosphere even on the hot side air is going to come back from the throttle plate to the atmosphere where there is no resistance. More response with recirc over atmosphere but placement shouldnt matter on atmosphere for response |
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