S14 SR20DET Stock Recirculation Valve Boost Limit? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

MrMigs · 04-20-2016, 05:23 PM

Searched... if the answer is out there, I might have used the wrong terms...

Anyways... anyone know what the max boost that the OEM SR20DET recirc valve is good for before it starts leaking?

LoSt180 · 04-21-2016, 06:18 AM

The OEM S14 blowoff valve has a tiny hole in it that bleeds off boost. I found a few old threads, maybe on soxc, where they described how to plug it up. Sounded like anything over the stock 11-12lbs would cause boost to be bleed off. My boost went up a tad just by replacing it with a recirculated HKS.

Here's a few posts I found about the mod to block that hole.
http://www.nissansilvia.com/forums/i...howtopic=26512
http://www.plmsdevelopments.com/files/sr20_bov_mods.pdf

MrMigs · 04-21-2016, 09:30 AM

Ahh thanks for those...
Hmm... I just wonder if it will still hold 17psi after the mod. One guy from the first link said it should be able to hold 16, but if anyone has any first hand experience and/or can verify, that would be awesome. Otherwise... maybe time to do some experimenting

LoSt180 · 04-21-2016, 09:54 AM

Experiment and report back! I have a feeling that when people get to that level of boost, they're replacing a lot of other things at the same time.

MrMigs · 04-21-2016, 10:04 AM

hmmm yeaaa I dunno... I've got an upgraded turbo and intercooler with piping, electronic boost controller, standalone computer, blah blah blah ... but it's all utilizing the stock recirculating setup LOL

But I'll see about doing some testing this weekend. Would just suck to go through the trouble of blocking that little bypass port and the bov still not be able to hold 17 pounds. fuuahhh

04-20-2016, 05:23 PM	#1
MrMigs Nissanaholic! Join Date: Jul 2001 Location: San Gabriel, CA Age: 37 Posts: 1,654 Trader Rating: (5) Feedback Score: 5 reviews	S14 SR20DET Stock Recirculation Valve Boost Limit? Searched... if the answer is out there, I might have used the wrong terms... Anyways... anyone know what the max boost that the OEM SR20DET recirc valve is good for before it starts leaking? __________________ Cheap parts for sale: http://zilvia.net/f/showthread.php?t=534430

04-21-2016, 09:30 AM	#3
MrMigs Nissanaholic! Join Date: Jul 2001 Location: San Gabriel, CA Age: 37 Posts: 1,654 Trader Rating: (5) Feedback Score: 5 reviews	Ahh thanks for those... Hmm... I just wonder if it will still hold 17psi after the mod. One guy from the first link said it should be able to hold 16, but if anyone has any first hand experience and/or can verify, that would be awesome. Otherwise... maybe time to do some experimenting __________________ Cheap parts for sale: http://zilvia.net/f/showthread.php?t=534430

04-21-2016, 10:04 AM	#5
MrMigs Nissanaholic! Join Date: Jul 2001 Location: San Gabriel, CA Age: 37 Posts: 1,654 Trader Rating: (5) Feedback Score: 5 reviews	hmmm yeaaa I dunno... I've got an upgraded turbo and intercooler with piping, electronic boost controller, standalone computer, blah blah blah ... but it's all utilizing the stock recirculating setup LOL But I'll see about doing some testing this weekend. Would just suck to go through the trouble of blocking that little bypass port and the bov still not be able to hold 17 pounds. fuuahhh __________________ Cheap parts for sale: http://zilvia.net/f/showthread.php?t=534430

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04-21-2016, 06:18 AM	#2
LoSt180 Zilvia Addict Join Date: May 2013 Location: MD Posts: 966 Trader Rating: (18) Feedback Score: 18 reviews	The OEM S14 blowoff valve has a tiny hole in it that bleeds off boost. I found a few old threads, maybe on soxc, where they described how to plug it up. Sounded like anything over the stock 11-12lbs would cause boost to be bleed off. My boost went up a tad just by replacing it with a recirculated HKS. Here's a few posts I found about the mod to block that hole. http://www.nissansilvia.com/forums/i...howtopic=26512 http://www.plmsdevelopments.com/files/sr20_bov_mods.pdf

04-21-2016, 09:54 AM	#4
LoSt180 Zilvia Addict Join Date: May 2013 Location: MD Posts: 966 Trader Rating: (18) Feedback Score: 18 reviews	Experiment and report back! I have a feeling that when people get to that level of boost, they're replacing a lot of other things at the same time.