Jump to content
SAU Community

Recommended Posts

I've been told the best place to put a BOV is on the throttle body side of the intercooler piping or as close to the throttle body as possible. The skyline i own has the BOV on the turbo side of the piping under the left wheel guard. Will this affect the performance of the car or damage the turbo/ engine over a period of time ? Is it worth while changing it to the throttle body side ?

Near the T/B, just like factory.

No issue having it pre-cooler however. I currently run that set-up now no issues.

I'm sure there are others as well.

RE: T/B size - pointless IMO. All it does is reduce throttle control and is proven to be no major restriction even @ 350rwkw.

Near the T/B, just like factory.

No issue having it pre-cooler however. I currently run that set-up now no issues.

I'm sure there are others as well.

RE: T/B size - pointless IMO. All it does is reduce throttle control and is proven to be no major restriction even @ 350rwkw.

So other words ur saying i should move it to the throttle body side. What happens when u want a atmosphere BOV which are illegal . Would u tuck it under the guard between the intercooler & engine bay ? Or would u just get a plum back system instead ?

He's saying it's fine where it is now, but if you had to choose where to put it then you'd put it close to the TB as possible. It's fine for now.

What do u mean by now ? Is that based on how much work has been done to the engine or power it is making ? If so what power figure would u think at changing it over , or dose this only effect throttle response ? Sorry for so many questions !

What Nismoid was saying, is the current positioning of your blow off valve is OK. You can leave it there.

He's running it in the same position as you are - on the turbo side - and believe me, he's running high power. If it's ok for his application, then you won't need to change it any time in the future.

What I meant, was if for any reason you have to redo all your piping, you should move it closer to the throttle body. Otherwise, just leave it.

What Nismoid was saying, is the current positioning of your blow off valve is OK. You can leave it there.

He's running it in the same position as you are - on the turbo side - and believe me, he's running high power. If it's ok for his application, then you won't need to change it any time in the future.

What I meant, was if for any reason you have to redo all your piping, you should move it closer to the throttle body. Otherwise, just leave it.

All is very clear now , thanks for ur patience . The reason why i asked is the car is going to a Performance workshop in the next few weeks. Car currently has a Atom BOV , but am changing it to a plum back system. Might as well relocate the BOV to the T/B side also !

Ye soz - where it is, as stated, is fine mate.

Im running 270/280rwkw, not a problem - 8,000km's as it is.

What recirc BOV are you using?

GTR BOV's cost for gain, are unbeatable value.

Even a single GTR BOV is good for 300rwkw or so. Much more 2 is advisable as you get a tiny bit of surge (i was when running 24psi/370rwkw on single GTR BOV)

Much more 2 is advisable as you get a tiny bit of surge (i was when running 24psi/370rwkw on single GTR BOV

What does this mean sorry? This may now also apply to me, as I'm going to be replacing my stock s1 GTS-T BOV with a R33 GT-R BOV very soon (just paid fellow member for it last night) and I'm running ~285rwkw @15psi. Reason I've bought it is because it's a little bit of insurance, why not have a more reliable BOV now that I'm flowing a lot more air, and I have a feeling mine is playing up as I am not making the same peak boost as I was when car was tuned (haven't even gone through a tank since)

I will be pushing ~17psi though my intake, so GT-R BOV would be preferable for me even though I'm running it ATMO lol

What does this mean sorry?

This:

19sec-22sec

28sec-32sec

39sec-43sec

It wasn't quite letting off all the air and I had the tiniest of surge. Most noticeable @ the 39-43sec marker when it was a full 24psi.

This was a 600HP GT30 so it was moving some air @ that boost level of course.

The return line was the external diameter of the BOV outlet as well, so it wasn't that.

Was a full size pipe, thin wall, to the T/B as well (whatever stock T/B size is).

Oh right, so if I'm running 17psi through the hypergear turbo, it won't leak under boost and won't have any issues letting it all out when I let off throttle - sweet :(

Yep - it will be fine - if you get surge after full load, you just need to run the dual.

But I would hedge a bet your set-up should be ok as I rarely noticed it doing it with ~17psi.

Only 4th, full load on my car up a hill or something

I don't entirely understand compressor surge, especially now that the BOV apparently has something to do with it while on throttle...I thought it was where the compressor was trying to feed more air through the engine than it would take, causing reversion back to the compressor wheel...and given that I thought the BOV would be closed when pressure on both sides of the TB are equal, how would it have anything to do with surge if it were a GTR BOV or GTS-T?

On low throttle, BOV leaks just a tad.

Thus, the excess air is "bled" off, alleviating comp surge @ lower RPM's particularly on a TT set-up.

So its stopping exactly what you say, too much air @ low RPM.

As the leak @ idle/low RPM/load (vac controlled) it stops this low end surge.

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


  • Similar Content

  • Latest Posts

    • Yeah we keep on in the dailies, it is pretty poor how many animals get hit and the driver leaves without checking....have saved a couple of little ones over the years. Bit of a gruesome job though, pouches generally need to be cut open because they are so tight and often the joey doesn't realise mum is gone so they are still locked onto the teat. I checked the modules in front of the DS wheel where an oil cooler should go.... There is the radar unit - that can go for race use) One of the 2 HX water pumps, the silver cylinder. That needs to be kept but might be able to be relocated But the bad news, the big computer mounted vertically in front of the wheel (blocking any potential air exit) is the electric steering computer. That is required until/unless i do a hydraulic steering conversion, and in CAD based modern car design it is not like I can just pop a big unit like that somewhere else (plus the loom would be too short anywhere else too). So, the passenger side is OK to clear out (just use a smaller washer reservoir, potentially elsewhere), but the DS no beuno
    • Well, all the best with the new camry It was interesting to hear about the UK process, it is generally a lot more streamlined here with a shipping agent looking after all the import side (noting the exact final price can still be a surprise.....) and I've used a few different brokers on the japan (or US) side, and never had any trouble with any of them....luck of the draw I guess. You mentioned you didn't get the auction sheet (understandable since you bought it from a dealer, not auction), but I always try and get hold of that because they are pretty thorough. I've imported 2x R grade vehicles over the years and both were fine, repairs in Japan are pretty thorough compared to here in Oz.
    • BTW I measured the jack I have, it is 70mm at the saddle but you only have about 700 until it returns to 150mm high at the cylinder so it is good but no magic bullet.
    • My experience with Rising Sun Exports Before agreeing to the sale I tried to do as much research as I could (obviously), his Facebook reviews are 98% and he goes Live at least once or twice a week. I contacted 2 people in the UK who had used him for their imports, both had positive feedback. His explanation and talk through of the import process was thorough, answering any query no matter how stupid it was. It felt as soon as the money was sent, communication dropped off. I asked for shipping updates every 2 weeks or so, not wanting to pester him, he never had any updates. I wasn't informed the car had been dropped off at the port, I only found out by his Facebook story. I asked for the photos taken at the port, knowing he would need some for insurance purposes. I received a few 5 second clips and that's it. When asked again, he said his staff had them. Weeks later I asked again, he tells me he doesn't have any, but does have 50 photos from the original advert. I never received them. I eventually got the documents sent via WhatsApp after I mentioned the port was requesting them. I purchased a CarVX report, to find out the vehicle is a Grade R with recorded accident damage, first recorded in 2017 when it was first auctioned. He never told me the grade, then again I didn't ask. His response was "Grade R means nothing, it wasn't chassis damage". Still, I would have liked to have been informed about it. Jon prides himself on being open and honest when it comes to inspecting cars, it's his main job doing so at the auctions for customers. When the vehicle arrived in the UK I noticed a few little cosmetic issues. It's a 21 year old car so it wasn't going to be mint condition. The side skirts are cracked on each corner and the sealant is failing. The front grill on the bonnet/hood isn't secured very well, mounting studs are missing. Both minor things, but again, it would have been nice to be told. During a Facebook Live walk around video of the vehicle, he mentioned it has a front Whiteline anti roll bar/sway bar. While on the inspection ramp, I noticed the stock item has been installed. When first questioned, his response was "the ARB? Switched? Since when, it never had them". Since sending video and photo evidence I've not received a response. I'm probably being over critical of the overall condition of an old car, but all I wanted was honesty (which he claims to have). I'm aware I wasn't his only customer, he's busy doing XYZ but other reviews praise him for great communication with regular updates and photos, I felt I didn't receive the same treatment. 
    • I was able to get some underside photos while the car was on the ramp The suspension is all Altezza/IS200/IS300 so getting part's will hopefully be less of a headache
×
×
  • Create New...