cheap bosch bov replacement - Page 4 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 08-29-2007, 04:21 AM   #61
Elite Member
iTrader: (5)
 
akaryrye's Avatar
 
Join Date: Jul 2006
Location: Central California
Posts: 2,526
Total Cats: 0
Default

I just had an idea that I would like to put out there. Could I put the springs in a vice and, compress them a little and heat them with a torch to reduce the tension a bit?
akaryrye is offline   Reply With Quote
Old 08-29-2007, 07:07 AM   #62
Elite Member
iTrader: (5)
 
Atlanta93LE's Avatar
 
Join Date: Sep 2006
Location: Marietta, GA
Posts: 2,198
Total Cats: 1
Default

Quote:
Originally Posted by Ben View Post
Ben, does your new BOV make a nice continous 'woosh' when it opens? or does it oscillate like mine?
It's a decent whoosh right now, but I can hear some faint compressor surge still (definitely not BOV fluttering). That said, there is still a bit of adjustment to be made, lubricating the BOV piston, and switching from a 3/4" bung to a 1" bung (stupid old 323GTX valve was 3/4" opening), hopefully getting a better blow-off.
Atlanta93LE is offline   Reply With Quote
Old 08-29-2007, 09:25 AM   #63
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

Are you getting surge or is the BOV cycling open/closed?
Most BOVs in miatas don't get enough vac signal to open properly or stay open at the end of the blow event. IM ports are too small.
Ben is offline   Reply With Quote
Old 08-29-2007, 10:44 AM   #64
Elite Member
Thread Starter
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,244
Total Cats: 291
Default

ryrye- compressing the spring (permanently) would be the same as the adjustment screw, so if you're out of adjustment, I say yes. I'd avoid the torch on a little spring. I'm still amazed that the weakest spring is producing that much tension. Did you guys get three springs? (I did)

I'm running a 1" bung for the bov.
m2cupcar is offline   Reply With Quote
Old 08-29-2007, 12:14 PM   #65
Elite Member
iTrader: (5)
 
akaryrye's Avatar
 
Join Date: Jul 2006
Location: Central California
Posts: 2,526
Total Cats: 0
Default

oh it is most definitely compressor surge as i relocated my bov to just after the IC so its right in the mouth of the car, but I hear this sound coming from right in front of me (out of the intake piping. I am just sort of surpised that my temporary ABS piping hasnt blown off lol. Even with the slightest of spooling, I get this slight snickering sound and when I spool it up for real, it gobbles like a turkey and people look at me funny. If your wondering what vac port I am using, it is the one that the Charcoal canister used while it was still in the car
akaryrye is offline   Reply With Quote
Old 08-29-2007, 01:39 PM   #66
Junior Member
iTrader: (1)
 
Join Date: Apr 2006
Location: Kirkland, WA
Posts: 239
Total Cats: 0
Default

Quote:
Originally Posted by akaryrye View Post
oh it is most definitely compressor surge as i relocated my bov to just after the IC so its right in the mouth of the car, but I hear this sound coming from right in front of me (out of the intake piping. I am just sort of surpised that my temporary ABS piping hasnt blown off lol. Even with the slightest of spooling, I get this slight snickering sound and when I spool it up for real, it gobbles like a turkey and people look at me funny. If your wondering what vac port I am using, it is the one that the Charcoal canister used while it was still in the car
I get that exact same sound. I'm using the vacuum port that the VICS solenoid normally uses on the 2000 manifold. The hole for the vacuum line on the BOV itself is really damn small, though.

-Mike
grippgoat is offline   Reply With Quote
Old 08-29-2007, 07:58 PM   #67
Elite Member
iTrader: (5)
 
akaryrye's Avatar
 
Join Date: Jul 2006
Location: Central California
Posts: 2,526
Total Cats: 0
Default

It takes very little to compress/ decompress that little chamber in the bov, I would be surprised if it was caused by not enough vacuum.
akaryrye is offline   Reply With Quote
Old 08-29-2007, 08:52 PM   #68
Senior Member
iTrader: (1)
 
Join Date: Aug 2006
Location: Illinois
Posts: 1,011
Total Cats: 7
Default

VICS? Don't use the VICS vacuum source to the VICS solinoid. It comes from a reservoir chamber in the intake. Use a direct vacuum source like the line before the check valve for the chamber.
lazzer408 is offline   Reply With Quote
Old 08-29-2007, 09:26 PM   #69
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

I drilled and tapped my IM for my Tial BOV to eliminate any flutter. I used 1/8" NPT fittings and it cured it all. My WG signal comes from the compressor though through the GM solenoid.
cjernigan is offline   Reply With Quote
Old 08-30-2007, 05:37 AM   #70
Junior Member
iTrader: (1)
 
Join Date: Apr 2006
Location: Kirkland, WA
Posts: 239
Total Cats: 0
Default

Quote:
Originally Posted by lazzer408 View Post
VICS? Don't use the VICS vacuum source to the VICS solinoid. It comes from a reservoir chamber in the intake. Use a direct vacuum source like the line before the check valve for the chamber.
Hrm. I suppose maybe I'm not using the VICS one. I don't actually have VICS working right now, for one thing. The port I'm using is on the top of the manifold, facing the engine, approximately above the first intake runner.

-Mike
grippgoat is offline   Reply With Quote
Old 08-30-2007, 10:01 AM   #71
Elite Member
Thread Starter
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,244
Total Cats: 291
Default

fwiw - I'm using a vacuum port that's immediately after the throttle body on the underside of the manifold.
m2cupcar is offline   Reply With Quote
Old 08-30-2007, 12:10 PM   #72
Elite Member
iTrader: (5)
 
akaryrye's Avatar
 
Join Date: Jul 2006
Location: Central California
Posts: 2,526
Total Cats: 0
Default

I just gave up on this damn piston style POS. I tried everything to make the thing blow off and it just would not. Basically the design is **** and its never going to work right. It sucks to be limited again to 11-12psi again ( not blowing off gave me a nice steady 14-15psi to redline) but at least it isnt gobbling anymore :(
akaryrye is offline   Reply With Quote
Old 08-30-2007, 12:16 PM   #73
Elite Member
iTrader: (14)
 
Join Date: Mar 2006
Location: Edmonton, AB
Posts: 4,921
Total Cats: 0
Default

I can hold 15 psi using a cheap plastic bosch BOV from a VW.
jayc72 is offline   Reply With Quote
Old 08-30-2007, 12:27 PM   #74
Elite Member
iTrader: (5)
 
akaryrye's Avatar
 
Join Date: Jul 2006
Location: Central California
Posts: 2,526
Total Cats: 0
Default

well i have a bosch that came with my begi kit and it will not let me go past 12ish psi other than a quick spike to 15 when i mash it
akaryrye is offline   Reply With Quote
Old 08-30-2007, 12:32 PM   #75
Elite Member
Thread Starter
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,244
Total Cats: 291
Default

I wonder if it's just the lack of qc on the piece or if yours was different mechanically - I know ben said his was different.

When I installed this bov my boost peak went to over 17psi from a peak of 14psi on the bosch. With the bosch I couldn't get anything to higher to hold with the MBC. It would just shoot up and immediately fall back down accompanied by a loud whistling sound. This was the more expensive "metal" bosch - but I'm sure there's some tolerance in quality and tension among those units too.
m2cupcar is offline   Reply With Quote
Old 08-30-2007, 12:38 PM   #76
Elite Member
iTrader: (5)
 
akaryrye's Avatar
 
Join Date: Jul 2006
Location: Central California
Posts: 2,526
Total Cats: 0
Default

i might be getting the part that you got, or I may just suck it up and buy a forge or something like that
akaryrye is offline   Reply With Quote
Old 08-30-2007, 03:35 PM   #77
Senior Member
iTrader: (1)
 
Join Date: Aug 2006
Location: Illinois
Posts: 1,011
Total Cats: 7
Default

Are you sure you guys are putting those valves in right? Post pictures.
lazzer408 is offline   Reply With Quote
Old 09-06-2007, 08:27 AM   #78
Elite Member
iTrader: (8)
 
Join Date: Sep 2006
Location: Severn, MD
Posts: 1,927
Total Cats: 5
Default

I just put the red non recirc BOV in from this thread. Got the gobbling at first but then loosened the spring tension on the spring that was installed (got two) and now it's blow off fine. That's at 11 psi. Shouldn't be a problem to go hight as I should be able to tighten it a bit if need be. I'll probably pump 15 psi through the system and see if it leaks.

Frank
fmowry is offline   Reply With Quote
Old 11-20-2007, 05:26 PM   #79
Senior Member
iTrader: (3)
 
Join Date: Feb 2006
Location: Centennial, CO
Posts: 672
Total Cats: 20
Default

Sorry to bring this back from the dead, but I just got around to installing my turbo setup with VTA BOV people here have been having problems with, and sure enough, I too am having compressor surge.

Is it ok for the BOV to leak at idle? Also, did anyone figure out the best way to fix this, like try new o-rings, different springs, etc? Or did the people with the bad ones just buy the same one M2Cupcar had that can be used for recirculation? Thanks!
karter74 is offline   Reply With Quote
Old 11-20-2007, 05:35 PM   #80
Junior Member
iTrader: (1)
 
Join Date: Sep 2006
Posts: 464
Total Cats: 0
Default

You guys need to stop going cheap on valves. It hurts me to see it.
PAT! is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 59 Today 09:00 PM
WTB MP62 (Hotside) (NB2) Rick02R WTB 3 01-03-2016 08:18 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
Walbro 255lph Fuel Pump $50 lsc224 Miata parts for sale/trade 2 10-01-2015 10:17 AM
why is my car running like pewp? (tune/datalog) itsMikey MSPNP 3 09-28-2015 07:40 AM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 09:49 PM.