Low Boost Issues: BNR 60-1
Thread Starter
Bastardized RE AE
Joined: Sep 2001
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From: Marysville, CALI
I just got done reading the other thread, 4 pages worth, about the HKS BOV and FMIC's you and walkel7 posted in.
Anyone figure out which BOV can hold boost and not have compressor surge with our cars?
I'm running a similar setup to yours.
ed
Anyone figure out which BOV can hold boost and not have compressor surge with our cars?
I'm running a similar setup to yours.
ed
Originally Posted by edomund
Trying to decide which BOV to go with.
Any suggestions for one that will not leak (15PSI application) and reduce compressor surge.
I realize that there are trade-offs with BOV's
BTW Bryan@BNR suggested the old HKS racing BOV. But I forgot to ask if it was so stiff it was hard to blow off or not.
ed
Any suggestions for one that will not leak (15PSI application) and reduce compressor surge.
I realize that there are trade-offs with BOV's
BTW Bryan@BNR suggested the old HKS racing BOV. But I forgot to ask if it was so stiff it was hard to blow off or not.
ed
thats actually what i have and I don't have a problem with compressor surge or leaky boost
Thread Starter
Bastardized RE AE
Joined: Sep 2001
Posts: 977
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From: Marysville, CALI
Which one do you have, the old school HKS racing bypass valve?
this one?
http://www.optionsauto.com/prodinfo....S-17670-006100
How much boost are you running?
Do you have a FMIC?
this one?
http://www.optionsauto.com/prodinfo....S-17670-006100
How much boost are you running?
Do you have a FMIC?
I R SAD PANDA W/O BAW
Joined: Nov 2002
Posts: 6,061
Likes: 1
From: bay area
Originally Posted by edomund
I just got done reading the other thread, 4 pages worth, about the HKS BOV and FMIC's you and walkel7 posted in.
Anyone figure out which BOV can hold boost and not have compressor surge with our cars?
I'm running a similar setup to yours.
ed
Anyone figure out which BOV can hold boost and not have compressor surge with our cars?
I'm running a similar setup to yours.
ed
I R SAD PANDA W/O BAW
Joined: Nov 2002
Posts: 6,061
Likes: 1
From: bay area
Originally Posted by hondahater
yep thats the one I have, and i get no surge and i'm running about 15-17psi. I have the old school trust front mounted intercooler.
the bov came with the old school fmic so i don't know what spring is in it however I can tell you it hasn't leaked boost yet so it must be a good size spring and until now I had no idea what exact kind of bov I had until you posted that link, lol so thanks for that
I do get light compressor surge if I rev in neutral but thats it. Is that what you where discribing?
Originally Posted by ilike2eatricers
you get no surge even under the situations I described in the above post? bov location? vac source used?
I R SAD PANDA W/O BAW
Joined: Nov 2002
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From: bay area
yea well i dont get it by revving at idle under pretty much atmospheric and under slight vac letting off will reward me with some surge 
. under normal boosting it works like a charm but I'm not always in boost
. under normal boosting it works like a charm but I'm not always in boost
hum........and what is this, a trate of hybrid turbos? I would suggest then going to that bov cause really i never get it unless in neutral and I usually don't rev a crazy amount in neutral anyways.
Thread Starter
Bastardized RE AE
Joined: Sep 2001
Posts: 977
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From: Marysville, CALI
Shouldn't hurt the turbo with compressor surge under light throttle. I think that is the trade off for holding boost on a RX7, our cars don't pull that much vacuum as piston engines to aid in blowing off the BOV.
My damn crappy *** Blitz BOV leaks unless I set it so tight it doesn't even blow off under hard boost. If I set it so it blows off under light boost (3-4 PSI) it leaks like hell and all my boost goes out the BOV.
ed
My damn crappy *** Blitz BOV leaks unless I set it so tight it doesn't even blow off under hard boost. If I set it so it blows off under light boost (3-4 PSI) it leaks like hell and all my boost goes out the BOV.
ed
Originally Posted by Karack
Jerry is a freaking tool, that guy is so wacky. i called him today and introduced myself and he said "rotary shop eh? never knew we had one here..." i've gone in there numerous times and only ordered parts for all generation 7s but he didn't know we had a rotary shop... lol. anyways, i then asked him about a price for an RX8 exhaust system and he gave me a price of $1200 for the muffler at that point we quit the pricing for exhaust and i mentioned fabbing one up, he made some BS comment about modifying the emissions to non OEM being the modifiers responsibility for 15 years and anything non dealer is non OEM blah blah.
and according to him a stock 2nd gen will do 224MPH with just a chip to eliminate the "revv limiter"
he is such an idiot.
and according to him a stock 2nd gen will do 224MPH with just a chip to eliminate the "revv limiter"
he is such an idiot.
It is somewhat entertaining to watch him get pissed off as you order some tiny *** part that he has to order and has no idea where it goes. I remeber him grumbling "God damn people...can't find **** for these cars so they come here." Right there I nearly fell over laughing.EDIT: and Stan, my Greddy type S has the same problem. Light boost = compressor surge.
Last edited by SmogSUX; May 5, 2006 at 12:42 AM.
I R SAD PANDA W/O BAW
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From: bay area
Originally Posted by hondahater
hum........and what is this, a trate of hybrid turbos? .
Originally Posted by edomund
Shouldn't hurt the turbo with compressor surge under light throttle. I think that is the trade off for holding boost on a RX7, our cars don't pull that much vacuum as piston engines to aid in blowing off the BOV.
My damn crappy *** Blitz BOV leaks unless I set it so tight it doesn't even blow off under hard boost. If I set it so it blows off under light boost (3-4 PSI) it leaks like hell and all my boost goes out the BOV.
ed
My damn crappy *** Blitz BOV leaks unless I set it so tight it doesn't even blow off under hard boost. If I set it so it blows off under light boost (3-4 PSI) it leaks like hell and all my boost goes out the BOV.
ed
Blitz bovs unfortunately have had a reputation of leaking
Originally Posted by SmogSUX
EDIT: and Stan, my Greddy type S has the same problem. Light boost = compressor surge.
Ben tightened my actuator arm so it boosts to 14 psi...I don't know if it holds all the way to redline because 1st and 2nd are all wheelspin and by the end of 3rd I'm going pretty damn fast and don't have time to watch traffic and my boost gauge
I have the bov on the hot pipe with the vac source is coming off one of the three front vac lines on the UIM. Yeah when it blows off it goes pretty damn hard..though I haven't been there to feel it considering it doesn't blow off from a free rev.
I have the bov on the hot pipe with the vac source is coming off one of the three front vac lines on the UIM. Yeah when it blows off it goes pretty damn hard..though I haven't been there to feel it considering it doesn't blow off from a free rev.
Thread Starter
Bastardized RE AE
Joined: Sep 2001
Posts: 977
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From: Marysville, CALI
ilike2eatricers I realize that compressor surge will damage the turbo over time however I think it is an inevitable trade off that if you have your BOV tight enough to hold boost it will not blow off under light throttle. It's seems like give and take. Longer turbo life or more boost.
Good to see you got your low boost probs solved as well nick.
Good to see you got your low boost probs solved as well nick.
i believe only a recirculated Bov will not compressor surge under light boost, one of the things you have to live with when modifying i suppose.
actually i do have one of those o-rings but i doubt it's in much better shape than yours already is.
actually i do have one of those o-rings but i doubt it's in much better shape than yours already is.
I R SAD PANDA W/O BAW
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From: bay area
Originally Posted by edomund
ilike2eatricers I realize that compressor surge will damage the turbo over time however I think it is an inevitable trade off that if you have your BOV tight enough to hold boost it will not blow off under light throttle. It's seems like give and take. Longer turbo life or more boost.
Good to see you got your low boost probs solved as well nick.
Good to see you got your low boost probs solved as well nick.
Thread Starter
Bastardized RE AE
Joined: Sep 2001
Posts: 977
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From: Marysville, CALI
You basically tighten it until you reach the boost level you want to achieve. You are esentially telling the WG when to open (specific PSI desired). If your WG is ported properly it will open and sustain the boost level you want. If it's to small you'll get boost creep.
ed
ed