Jump to content
SAU Community

To Run A Bov Or Not And Fmic Issues!

P1@Y

By P1@Y,
in Engines & Forced Induction

 Share

Recommended Posts

P1@Y Collaborator

P1@Y

Posted
Posted

Hey guys

i know this topic has been covered before but there are a few other things i wanna know.

ive got a pretty well stock r33 skyline that im lookng at modding, now im pretty certain im going to be doing a highmount 3076 740s etc etc.

now the intercooler kit im looking at getting i DONT think has a place for the bov, it replaces that first piping bit that the bov sits in. now

im wondering do i NEED to run a bov? i know people have problems with idling etc but unsure if thats all because of the bov. as there are

alot of hoses/pipes that run of that first pipe im not to sure were there going to go when i install the fmic (bov being one of them)

any help will be mostly appreciated

Thanks Adam.

Link to comment
https://www.sau.com.au/forums/topic/418295-to-run-a-bov-or-not-and-fmic-issues/
Share on other sites
GTSBoy Grand Master

GTSBoy

Posted
Posted

Run a BOV. A stock one. And call it a compressor bypass valve, because that's what they really are. And add a conection point to the pipework just before the throttlebody if you have to, and add a connection point to the turbo inlet (angled towards the compressor snout) if you have to.

Job done.

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

If you're using a MAP sensor based ECU don't worry about running one, AFM better off running one, but isn't a must.. you can adjust the decel fuel cut to compensate for it.

I'm not going to start the BOV or no BOV war :nuke:

I never run BOVs, but that's just me.

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

yer i was thinking of running no bov but ive been told there are all these issues with idle etc, il be running a power fc with z32

Not all true, I've done it before and stuffed about with the decel fuel cut in the same table as the idle control to stop it from stalling on decel.

If you're running a stock ECU than you'll have "some" idle issues, like if you're cruising then clutch in your motor will stall but easy workaround is to gear down or bleep the throttle.

Piggaz Grand Master

Piggaz

Posted
Posted

I spose it depends who tunes it. Within 3 runs of having mine blocked off (due to the ARC twin entry cooler), Yavuz got out of the car and started looking around. Also, something you don't see on the dyno was the throttle response between gears suffered significantly because of it.

MrStabby Grand Master

MrStabby

Posted
Posted

The people suggesting that you dont worry about it have not mentioned the downsides. Piggaz did, so IMO his post is the most useful in this thread. If you're not sure if you can be bothered fitting one, do some research on what BOVs do, then you can decide if its worth it or not.

  • 2 weeks later...
Boostedrb20 Apprentice

Boostedrb20

Posted
Posted

im not running a bov on my mildly built rb20det! im running my afm in the cooler piping near the throttle body and no bov and it idles fine boost fine and goes hard! if you look back to the old 31's and vl's they didn't run a cooler or bov from factory.... plus i fond running no bov more responsive being that the cooler is still pressureized cause when you run the bov it lets all the pressure out, but its up to you how you want to set it up :)

eightsixboy Mentor

eightsixboy

Posted
Posted

Im not running a bov on my 33, no issues at all and no downsides. I have had no bov on all my cars, most if not all stock ones leak due to age. Im not sure why some guys are having issues with idle or decel without one, they might have there afm mounted in a non stock position?

All the people that say that having no bov is bad and will cause turbo failures Im yet to see any fail from not having one. A mate at work is running a 3076r with no bov, stil going strong after 3 years of 21 psi and 290rwkw,.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Im not running a bov on my 33, no issues at all and no downsides. I have had no bov on all my cars, most if not all stock ones leak due to age. Im not sure why some guys are having issues with idle or decel without one, they might have there afm mounted in a non stock position.

Stock ones leak ah idle/low throttle - on purpose - do you realise that is how they have been designed?

Plenty of people here running stock ones at 300Kw/20psi that don't leak under load, its like all things, age and condition of components.

You are one of the lucky ones with no issues, so good work there. Plenty of before/after posts around for people to read to show that there can be issues, most of it related to the tune as you need to compromise sometimes with the fuelling (non BOV) to stop the stalling.

so its not essential. But doesn't hurt - that's where the decision gets made really by the OP

All the people that say that having no bov is bad and will cause turbo failures Im yet to see any fail from not having one. A mate at work is running a 3076r with no bov, stil going strong after 3 years of 21 psi and 290rwkw,.

Not one person has said anything remotely close to that in this thread, or on the pages of this forum for YEARS now really.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • MBS206
      Recommendation for engine oil funnel spill free

      By MBS206 · Posted

      I thought I'd come back and add something I JUST learned. A Toyota LandCruiser with a 1HZ, mates perfectly with a bottle of Nulon brake fluid. As in, it perfectly screws in. Great make shift funnel when you cut the bottom of it off. This may work for your Corolla.   Unfortunately, tipping a 10L drum is much harder than a 4 to 6L bottle, and they no longer include the easy pour tap which was just perfection to use previously.  
    • EndZee
      Fuel Pump Control Module & Dropping Resistor

      By EndZee · Posted

      Guys since i bought r33 gts25t coupe 1994 automatic a/t(manual swap 350z gearbox)  all i got is problems, always problems. Lets start with that when i turn key into ignition(ON) fuel pump doesnt always works. Sometimes i have to turn key twice Off/on/off/on until it primes. Its new, dw300 - 340lph. My gearbox broke so i did gearbox swap, install different intake manifold, injectors and i take pipes. Car was sitting in garage for more than half a year. I did assembly all not that long ago and when i turn ignition cant hear prime. All of sudden it stopped working. Theres many videos on YouTube how to make relay mod on r33 straight from battery so i did and it doesnt work! 😰 30 - battery positive  87 - positive from fuel pump to relay 85, 86 - one of two wires from original fuel pump wires(light blue, grey) and it didn’t work. so I check on ignition and took original BLUE relays wires from trunk, next to fuses. (I believe it’s IGN+ and ECU pin 18. it didn’t work…  tried connecting (IGN+ from og relay) and (ECU 104 from 1of4 FPCM wires) to my new relay 85/86 and it didn’t work.  I unplug FPCM. Didn’t work. im thinking what’s wrong   fuel pump is working, if I leave IGN+ on 85 and 86 straight to ground it works but it’s just nonstop. Since it getting constant 12v after key in ON. light blue wire gives me 6-8v.  so how this should be connected? What causing ECU not giving — on pin? Or I did sth wrong and that’s why it doesn’t work? I need negative signal on ECU that control fuel pump. What this should be?
    • Duncan
      M35 Brake caliper replacement

      By Duncan · Posted

      You can use your VIN to look up the factory part number somewhere like amayama, and then look to order new if necessary. https://www.amayama.com/en/genuine-catalogs/nissan Depending on price you might want to rebuild instead. @GTSBoy I had an interesting insight into US market parts when the Titan rear calipers were sticking. New calipers were dirt cheap, about 20% more than a rebuild kit....they are just considered throw away maintenance items
    • Duncan
      Most women will agree that parking is the most taxing part of driving

      By Duncan · Posted

      Funny, but really not funny. Thank god (most) f the world has moved on since then
    • Duncan
      Jacks that fit under GTR lips that can reach the subframe?

      By Duncan · Posted

      Lots of votes for driving onto a plank first; that is the quickest way I've found, 25mm is enough for my case but that will vary by car It also depends where you are going for. On the 32 I can get to the rear diff with my floor jack if I do that end first, and get it up on stands. Then I lift the front from either front tow hook as high as needed, also onto stands. Sometimes I need a small lift on the other tow hook to get it level enough If I do the front first I can't get to the rear diff because of the angle of the car Other options are getting to the front mount of the rear subframe from in front of the wheel (if only lifting one side, or just do both which is a bit of a pain compared to one lift from the diff), or also the gearbox cross member mount on the driver's side if you are  just trying to lift the driver's side. I This is the jack I use; it says 75mm clearance but of course that is only on the lower section so if you have to reach too far in like the diff you still get stuck. https://www.snapon-bluepoint.com.sg/category/Floor-Jacks/product/Floor-Jack,-2-Ton-Low-Profile
×
×
  • Create New...