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Bov Relocation

66yostagea
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66yostagea Grand Master

66yostagea

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I am near completing fitting out the front facing plenum. The fmic is in and piped up, that was quite easy, as was most things after, as Darrin put it, a few drinks.

Now the original procedure was via stuff from Skylines, and the fuse boxes in the 33s is different to the Stagea, Thats a bugger caus you cant turn the T/B 180 degrees not even without a spacer. So I got all the bits in except the BOV. This was shown as being on the cold side of the IC. This means a massive piece of 30mm tube to get back to the inlet if you are not atmospheric BOVing.

Then thanks to KiwiRS4T(Bob) who is researching the same subject, I saw a BOV, vented back to the OEM inlet pipe, on the HOT side of the front mount. Now is this wise? I need some feedback as I am worried that the unloaded gasses may be too hot.

Help!

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Tangents Rising Star

Tangents

Posted
Posted
I am near completing fitting out the front facing plenum. The fmic is in and piped up, that was quite easy, as was most things after, as Darrin put it, a few drinks.

Now the original procedure was via stuff from Skylines, and the fuse boxes in the 33s is different to the Stagea, Thats a bugger caus you cant turn the T/B 180 degrees not even without a spacer. So I got all the bits in except the BOV. This was shown as being on the cold side of the IC. This means a massive piece of 30mm tube to get back to the inlet if you are not atmospheric BOVing.

Then thanks to KiwiRS4T(Bob) who is researching the same subject, I saw a BOV, vented back to the OEM inlet pipe, on the HOT side of the front mount. Now is this wise? I need some feedback as I am worried that the unloaded gasses may be too hot.

Help!

I was always under the impression that the closer the BOV is to the throttle body on the cold side the more efficient it works, as it would release pressure from the point furthest away from the turbo...

its not uncommon to have a piece of pipe running from one side of the engine bay to the other as a return, as coming from s15's that's how they were stock...

my 2 cents tho...

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89CAL Grand Master

89CAL

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Posted

I run a front facing plenum with BOV in the hot side plumbed back to intake. Works fine, shouldnt really matter. Heres a photo to hopefully help you out, I know its not a stagea but may still be helpful

IMG_1088.jpg

PM me if you want more photos

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msports180 Mentor

msports180

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Im interested to see if you guys notice a loss of response with going the forward facing plenum, im contemplating doing it on my R34, but i dont want to lose any response or mid range, and being they have shorter inlet i would assume you would lose some?

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66yostagea Grand Master

66yostagea

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Posted (edited)
Im interested to see if you guys notice a loss of response with going the forward facing plenum, im contemplating doing it on my R34, but i dont want to lose any response or mid range, and being they have shorter inlet i would assume you would lose some?

I guess Duncan would be the best to talk to. Or go to Skylines and look up Front Facing Plenums. There is a fair bit of info there. A lot of 33 drivers have done it.

Also if the runners were longer it would be better low down, but there is not much room. I think it will be better up top.

Edited by 66yostagea
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KiwiRS4T Grand Master

KiwiRS4T

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Im interested to see if you guys notice a loss of response with going the forward facing plenum, im contemplating doing it on my R34, but i dont want to lose any response or mid range, and being they have shorter inlet i would assume you would lose some?
I presume you mean off boost but I don't expect it to make any difference. On boost I thought the point was to reduce the length of piping and so reduce lag?!
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Duncan Grand Master

Duncan

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Posted

my particular plenum has quite long runners for greddy style....but I can't make any comment about response because I did the 3l block at the same time....

considered running no bov like me? it makes a very childish noise which makes me giggle :P

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