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Gtr Blow Off Valves

Don Dada
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Don Dada Mentor

Don Dada

Posted
Posted

Well i'm in the process of fitting a 26 in a C35 an getting some problems to pipe the stock blow offs back to the intake.

The OEM plastic cannot work because of the two 4" pipes i have for my CAI so i was thinking of using one greddy recirculating valve with some sort of 1" flexible hose back to the intake

The stock pipe where the stock blow offs come back into one is 2" and i just dont have space to run such a big flexible hose back to the intake either, not to mention i cant even get a flexible enough hose in that diameter to buy.

So my question is..... Why Gtrs use two blow offs even though they come back in to one commom pipe back to the intake?!?

And will it be a problem if i use one greddy recirculating valve(attached) instead???

post-42272-1241836898.jpg

Any help ASAP will be greatly appreciated

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Andrew_Lazzaro Collaborator

Andrew_Lazzaro

Posted
Posted

i believe bovs come from both sides of inercooler. to allow pressure to be released from inlet and outlet side of intercooler.

Possibly to create a more uniformly distrubuted release of pressure through your intake system? correct me if im wrong.

Don Dada Mentor

Don Dada

Posted
  • Author
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Ok

Ill be running stock turbos at 13-14psi. I was just wondering if this valve would be able to discharge the volume of air necessary to have the system working properly.

I noticed when i had this valve on the 25 it made the fluttering sound when releasing from small throttle openings....Was this compressor surge,or is it just the way these valves work?

Probably have to do something with the adjustment?

Thanks again.

Beer Baron Grand Master

Beer Baron

Posted
Posted
i believe bovs come from both sides of inercooler. to allow pressure to be released from inlet and outlet side of intercooler.

Possibly to create a more uniformly distrubuted release of pressure through your intake system? correct me if im wrong.

yes you are wrong. both BOVs are mounted on a common pipe that is attached the outlet pipe of the intercooler. and then they have another Y pipe that joins their outlets and feeds it back to the intake.

you can use one, but that BOV will flow much less air than the factory set-up. why not just use the factory twins? they are good. otherwise if you wan Greddy use the type R. it's a much better unit than the cheap type S one you have pictured.

06tst Collaborator

06tst

Posted
Posted

2x turbos = 2x airflow = 2x BOVs ...why they didnt just make one bigger one i dont know

but if your using those type s ones use two. ive seen them on the same pipe the stock ones are on so there are adapters to suit. (they sound stupid too just like the hks ones)

go a type R... i run one and they are good... dont go pssshhh or kaching... just a big venting/dump of air sound

Beer Baron Grand Master

Beer Baron

Posted
Posted

exactly. to be honest 1 type S will be much worse than stock, and even two Type S will be certainly no better than stock, and possibly worse as they have a very small valve.

either keep the stock ones which are great, or get the type R one which is actually good. if you just want BOV noise then get some pods and a alluminium hard pip kit. at least it's actually beneficial as well as noisy.

Cartman Rising Star

Cartman

Posted
Posted

one thing you guys missed is where he has said this... The OEM plastic cannot work because of the ""two 4" pipes i have for my CAI""

anyone say overkill on the cai.. get rid of one of those 4" pipes and run your piping how it should be with 2 stock gtr bov's or a trust type R bov.

Don Dada Mentor

Don Dada

Posted
  • Author
Posted

Well after some fiddling,cutting,grinding and the use of some colorful words i got the oem valves to work.

I used some 2" air breeder hose and changed one of my 4" cai pipes to a 3"

Cant even hear the blow offs talk to each other right now cause i'm driving with just the front pipe alone. :P

post-42272-1242261276_thumb.jpg

Beer Baron Grand Master

Beer Baron

Posted
Posted

looks good mate. best choice you could have made. I ran them on my old 32 GTR which had a full built motor, with serious headwork, cams, HKS turbos, power FC, 700cc injectors etc etc the full works and the stock BOVs handled the 20 odd psi pumping through them no problem.

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