how much vacuum does my car pull at idle in psi? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


General Miata Chat A place to talk about anything Miata

Reply
 
 
 
LinkBack Thread Tools
Old 08-17-2009, 10:40 PM   #1
Tour de Franzia
Thread Starter
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default how much vacuum does my car pull at idle in psi?

I don't feel like looking up the gay-*** conversion table, just ******* tell me or I'm going to kick your ***...please.


38kpa is the magic #. I need to order a ***** pump...I mean blow off valve.
hustler is offline   Reply With Quote
Old 08-17-2009, 10:48 PM   #2
Elite Member
iTrader: (12)
 
Join Date: Aug 2006
Location: Central-ish VA
Posts: 4,449
Total Cats: 16
Default

Here you go douche, 38 kpa 5.511434044 psi, However, 100kpa is atmo. So technically you are in negative psi.... My head hurts.
neogenesis2004 is offline   Reply With Quote
Old 08-17-2009, 11:02 PM   #3
Tour de Franzia
Thread Starter
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

Quote:
Originally Posted by neogenesis2004 View Post
Here you go douche, 38 kpa 5.511434044 psi, However, 100kpa is atmo. So technically you are in negative psi.... My head hurts.
so should I get an 8psi BOV spring, or something firmer? I'm pretty firm right now.
hustler is offline   Reply With Quote
Old 08-17-2009, 11:05 PM   #4
Elite Member
iTrader: (12)
 
Join Date: Aug 2006
Location: Central-ish VA
Posts: 4,449
Total Cats: 16
Default

Are you going with a Tial I assume? From what I've read you should go with the stiffest spring with it.

I personally have a Greddy Type R, so my **** is adjustable.
neogenesis2004 is offline   Reply With Quote
Old 08-17-2009, 11:07 PM   #5
Elite Member
iTrader: (9)
 
TurboTim's Avatar
 
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,483
Total Cats: 248
Default

I want it in inHg. My autometer gauge says my miata, idling is around 21.
TurboTim is offline   Reply With Quote
Old 08-17-2009, 11:08 PM   #6
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,317
Total Cats: 1,914
Default

Aren't you running a MAP-based ECU, Hustler? Hell, my BOV is open at idle.
Joe Perez is online now   Reply With Quote
Old 08-17-2009, 11:08 PM   #7
Tour de Franzia
Thread Starter
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

Tim, I'm still emailing you. I don't want compressor surge of course. My gauge reads 222 or so at idle, 28inhg on decel. What do you recommend?

Yes, tial Q.
hustler is offline   Reply With Quote
Old 08-17-2009, 11:09 PM   #8
Elite Member
iTrader: (12)
 
Join Date: Aug 2006
Location: Central-ish VA
Posts: 4,449
Total Cats: 16
Default

You need the Pink spring. -12psi.
neogenesis2004 is offline   Reply With Quote
Old 08-17-2009, 11:09 PM   #9
Tour de Franzia
Thread Starter
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

Quote:
Originally Posted by Joe Perez View Post
Aren't you running a MAP-based ECU, Hustler? Hell, my BOV is open at idle.
mine won't be....hopefully. However, I don't know if its better to go with too much or too little spring. I guess I'd rather it suck in dust rather than compressor surge.
hustler is offline   Reply With Quote
Old 08-17-2009, 11:11 PM   #10
Elite Member
iTrader: (12)
 
Join Date: Aug 2006
Location: Central-ish VA
Posts: 4,449
Total Cats: 16
Default

Trust me, you will not surge. If I lift when in boost, my logs show 8KPa which is the lowest the MAP sensor reads. That thing WILL open.
neogenesis2004 is offline   Reply With Quote
Old 08-17-2009, 11:19 PM   #11
Elite Member
iTrader: (9)
 
TurboTim's Avatar
 
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,483
Total Cats: 248
Default

http://www.tialmedia.com/documents/w3_tial_bovq_sp.pdf
I'd recommend whatever TiAL recommends cause I have zero experience with their stuff.
TurboTim is offline   Reply With Quote
Old 08-17-2009, 11:25 PM   #12
Tour de Franzia
Thread Starter
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

K, You've been emailed Tim. I'll go with pink.
hustler is offline   Reply With Quote
Old 08-17-2009, 11:34 PM   #13
Elite Member
iTrader: (9)
 
TurboTim's Avatar
 
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,483
Total Cats: 248
Default

FWIW, I had to modify/machine my old-style FM BOV to open sooner/have less spring pressure with the current twins. It's open at idle. Otherwise it'd compressor surge just going from 10inHG vac to 15inHg vac cruising.

But your .86 is going to be so laggy it won't matter.
TurboTim is offline   Reply With Quote
Old 08-17-2009, 11:38 PM   #14
Tour de Franzia
Thread Starter
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

Quote:
Originally Posted by TurboTim View Post
FWIW, I had to modify/machine my old-style FM BOV to open sooner/have less spring pressure with the current twins. It's open at idle. Otherwise it'd compressor surge just going from 10inHG vac to 15inHg vac cruising.

But your .86 is going to be so laggy it won't matter.
ok...then order a softer one, I don't care...go for what we know will work the first time because if I don't make it to Hallett with this car I'm going to cry.


yes, my turbine is too big and compression is too low.
hustler is offline   Reply With Quote
Old 08-17-2009, 11:55 PM   #15
Elite Member
iTrader: (12)
 
Join Date: Aug 2006
Location: Central-ish VA
Posts: 4,449
Total Cats: 16
Default

Get both springs??? They only cost like $15.
neogenesis2004 is offline   Reply With Quote
Old 08-17-2009, 11:56 PM   #16
Elite Member
iTrader: (15)
 
Join Date: Sep 2007
Location: Incline Village, NV
Posts: 2,073
Total Cats: 5
Default

Quote:
Originally Posted by hustler View Post
e if I don't make it to Hallett with this car I'm going to cry.
lawlin
thesnowboarder is offline   Reply With Quote
Old 08-18-2009, 12:23 AM   #17
Elite Member
iTrader: (9)
 
TurboTim's Avatar
 
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,483
Total Cats: 248
Default

Quote:
Originally Posted by thesnowboarder View Post
lawlin
I didn't know what "lawlin" was so I looked it up.

I got 2 full weekends to build yours stuffes. Plus an extra day off work due to Labor day. If he doesn't make it it won't be because of me.
TurboTim is offline   Reply With Quote
Old 08-18-2009, 12:24 AM   #18
Elite Member
iTrader: (46)
 
Stein's Avatar
 
Join Date: Dec 2007
Location: Nebraska
Posts: 4,812
Total Cats: 138
Default

Quote:
Originally Posted by hustler View Post
yes, my turbine is too big and compression is too low.
Saved for posterity.
Stein is offline   Reply With Quote
Old 08-18-2009, 12:31 AM   #19
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,317
Total Cats: 1,914
Default

Quote:
Originally Posted by hustler View Post
mine won't be....hopefully. However, I don't know if its better to go with too much or too little spring. I guess I'd rather it suck in dust rather than compressor surge.
Better to go with too little. There's nothing wrong with it leaking at idle, just put a filter on the discharge port. Quiets it down a tad at the same time.
Joe Perez is online now   Reply With Quote
Old 08-18-2009, 12:35 AM   #20
Elite Member
iTrader: (9)
 
TurboTim's Avatar
 
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,483
Total Cats: 248
Default

Tial Q has discharge ports all around cause that's sooo cool right. But I agree nevertheless.
TurboTim is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
FS/FT: 03.5 Mazdaspeed Protege leatherface24 Cars for sale/trade 15 10-16-2015 12:35 PM
MS PNP requires reading and following directions??? satisfied MEGAsquirt 141 10-06-2015 11:44 AM
WTB parts for HPDE car Voltwings WTB 5 09-11-2015 09:23 AM
Advanced Engine Dynamix Review (dead oil pump content) itsMikey Insert BS here 0 09-05-2015 03:56 PM


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 10:33 AM.