home register FAQ memberlist calendar

Go Back   Turbobricks Forums > Mechanical > performance & suspension

Reply
 
Thread Tools Display Modes
Old 04-17-2017, 09:14 AM   #1
Marvelous3
Who engineered this?
 
Marvelous3's Avatar
 
Join Date: Nov 2002
Location: Atlanta
Default Tial BOV spring?

Riddle me this...

The Tial BOV I have on the red car came stock with a plain spring which says it is 11* for 18-20" vacuum. The red car pulls like 9-10" of vacuum at idle so this spring was way too stiff and causing compressor surge. I ordered a 7* spring for 8-13" vacuum yet was still getting compressor surge. I cut the 7* spring shorter and shorter trying to get it to work right but I was still getting surge. I eventually cut it so short that it was working but the BOV would remain open all of the time. I then added some shims to so that the BOV would stay closed while driving but the compressor surge is back. wtf.

If I boost it and let off vacuum will spike to 20" so there should be plenty of vacuum to pull the valve open. I do only have a smaller vac line running to the bov so maybe when I let off the vacuum is collapsing the hose? It's the only thing I can think of at this point.
__________________

1990 240dl Kaplhenke Coilover Daily
1991 245+16 Valve Turbo Microsquirt
Need Hyundai or Genesis parts? PM me for Genuine Hyundai or Genesis parts
Marvelous3 is offline   Reply With Quote
Old 04-17-2017, 09:24 AM   #2
poulrais
Board Member
 
poulrais's Avatar
 
Join Date: Sep 2006
Location: Quebec, CAN
Default

Is your hose made of regular rubber or silicone? The silicone ones tend to collapse more under negative pressure.
__________________


1990, Volvo 740 16v +T
1991, Volvo 745T 16V - crushed
poulrais is offline   Reply With Quote
Old 04-17-2017, 09:30 AM   #3
Marvelous3
Who engineered this?
 
Marvelous3's Avatar
 
Join Date: Nov 2002
Location: Atlanta
Default

No, it's not silicone. We called it "red hose" but it's BMW rubber vacuum hose with a braided nylon casing.

https://www.ecstuning.com/b-genuine-...r/11657803732/

EDIT://
Looking again, tial recommends 1/4" line on the valve but the BMW hose is only 3.5mm. Might be something there?

Last edited by Marvelous3; 04-17-2017 at 09:56 AM..
Marvelous3 is offline   Reply With Quote
Old 04-17-2017, 10:13 AM   #4
poulrais
Board Member
 
poulrais's Avatar
 
Join Date: Sep 2006
Location: Quebec, CAN
Default

Quote:
Originally Posted by Marvelous3 View Post
No, it's not silicone. We called it "red hose" but it's BMW rubber vacuum hose with a braided nylon casing.

https://www.ecstuning.com/b-genuine-...r/11657803732/

EDIT://
Looking again, tial recommends 1/4" line on the valve but the BMW hose is only 3.5mm. Might be something there?
Yep... You're almost 3mm short of 1/4"
poulrais is offline   Reply With Quote
Old 04-17-2017, 10:16 AM   #5
mopar318
Board Member
 
mopar318's Avatar
 
Join Date: Apr 2013
Location: Fort Wayne
Default

I like 1/4" fuel hose for stuff like that.
__________________
^^^^^^^^^^^^^
Pimps out interiors.

1989 244 b230ft with pLAID recaros
1980 242 16 valve turbo
2007 V70R

mopar318 is online now   Reply With Quote
Old 04-17-2017, 03:44 PM   #6
Marvelous3
Who engineered this?
 
Marvelous3's Avatar
 
Join Date: Nov 2002
Location: Atlanta
Default

Aeroquip only makes socketless 4an hose in blue?

https://www.summitracing.com/parts/a...0410/overview/
Marvelous3 is offline   Reply With Quote
Old 04-17-2017, 03:44 PM   #7
doucheNozzle
Newbie
 
doucheNozzle's Avatar
 
Join Date: Feb 2009
Location: The Pitt, 15218
Default

Why do you only have 10" of vacuum at idle?
__________________

'95 850 T-5R - FailSedan
'04 V70 T5A - FailFamily
doucheNozzle is offline   Reply With Quote
Old 04-17-2017, 03:58 PM   #8
Marvelous3
Who engineered this?
 
Marvelous3's Avatar
 
Join Date: Nov 2002
Location: Atlanta
Default

Quote:
Originally Posted by doucheNozzle View Post
Why do you only have 10" of vacuum at idle?
idk? In park it's 14-15" but in drive it's only 10".
Marvelous3 is offline   Reply With Quote
Old 04-17-2017, 04:12 PM   #9
mopar318
Board Member
 
mopar318's Avatar
 
Join Date: Apr 2013
Location: Fort Wayne
Default

Quote:
Originally Posted by doucheNozzle View Post
Why do you only have 10" of vacuum at idle?
Cams?
mopar318 is online now   Reply With Quote
Old 04-17-2017, 04:18 PM   #10
Marvelous3
Who engineered this?
 
Marvelous3's Avatar
 
Join Date: Nov 2002
Location: Atlanta
Default

It does have penta cams ^_^
Marvelous3 is offline   Reply With Quote
Old 04-17-2017, 05:21 PM   #11
poulrais
Board Member
 
poulrais's Avatar
 
Join Date: Sep 2006
Location: Quebec, CAN
Default

Quote:
Originally Posted by Marvelous3 View Post
idk? In park it's 14-15" but in drive it's only 10".
I'm pulling 18-19" at idle with ym 16V head and regular cams once the motor is hot... I just checked and my Tial BOV vacuum hose is 1/4" but it is rather long cause it's running from behind the right side headlamp over the intercooler and connects under Nathan's made intake so like a least 4 feet.
poulrais is offline   Reply With Quote
Old 04-17-2017, 06:59 PM   #12
gross polluter
They see me trollin'
 
gross polluter's Avatar
 
Join Date: Dec 2008
Location: Cold Lake, AB
Default

Where exactly are you sourcing the vacuum for the BOV?
__________________
'88 245 - 2JZGTE VVTi | MS3X ECU, MS2 TCU | GT3582R-HTA | Staged simultaneous dual fuel | 590whp 580ftlbs @ 22psi

1968 Furd Rustang fastberk | 2JZGTE VVTi | MS3X ECU | PT6776S @ 18 psi | 4L80e Microsquirt TCU Sloppy Transbrake | 3.73 8.8" rear end

1981 Piper Cherokee Archer II | All stock
gross polluter is offline   Reply With Quote
Old 04-17-2017, 07:08 PM   #13
Marvelous3
Who engineered this?
 
Marvelous3's Avatar
 
Join Date: Nov 2002
Location: Atlanta
Default

My intake manifold only really has 2 ports for vacuum. One I have dedicated to the map sensor only. The other I have two plastic T's in that connect to the fpr, bov, boost gauge and stuff. I'll look at it when I get home. I can't remember what all is t'd into what.

Last edited by Marvelous3; 04-17-2017 at 07:14 PM..
Marvelous3 is offline   Reply With Quote
Old 04-17-2017, 09:08 PM   #14
cosbySweater
Board Member
 
cosbySweater's Avatar
 
Join Date: Jul 2009
Location: Monterey/Falun
Default

I have a tial knock off, I have one big vac line going to a t on the driver's side of the head and from there it references the for,wastegate,boost gauge, and the bov with no issues. Are you sure the diaphragm is in good shape and nothing is causing the piston to hang up?
__________________
1979 Volvo 244DL 6.0/4l80e,8.8,microsquirt ecu and tcu, s366 clone.
2005 Honda Civic Hybrid, 5 Speed
1994 Corvette, 6speed, PNP special, gonna pill it to kill it

Quote:
Originally Posted by bricktop420 View Post
Thank you very much everybody... i now feel sufficiently retarded and will go cry in the corner...
Quote:
Originally Posted by mikep View Post
How come we get a Cosby sweater but no Boner in sweatpants in this thread?
cosbySweater is offline   Reply With Quote
Old 04-17-2017, 10:37 PM   #15
Marvelous3
Who engineered this?
 
Marvelous3's Avatar
 
Join Date: Nov 2002
Location: Atlanta
Default

I have the map sensor on it's own line to the intake manifold.

The BOV is T'd into the FPR, and boost gauge.

I have the boost controler beteen the line that goes from the wastegate and the turbo.

All of these lines are 3.5mm but the BOV line is supposed to be 1/4".
Marvelous3 is offline   Reply With Quote
Old 04-18-2017, 12:25 AM   #16
2fast242gt
Do you have a cobalt?
 
Join Date: Nov 2005
Location: appleton WI
Default

Mine has it's own vaccume source, and is 1/4" like. Works flawlessly. Even blows off at 2psi.
__________________
1983 242dl
*6.0 lq4 swaped* Build thread
http://forums.turbobricks.com/showthread.php?t=282323
 photo 9db5c0f4-0f9c-48c6-98ca-f10f9a74242e.jpg
2fast242gt is offline   Reply With Quote
Old 04-18-2017, 09:02 PM   #17
Marvelous3
Who engineered this?
 
Marvelous3's Avatar
 
Join Date: Nov 2002
Location: Atlanta
Default

Would it be a bad idea to t into the brake booster line instead? It's certainly big enough. I'm trying to avoid drilling a new port into the intake manifold.
Marvelous3 is offline   Reply With Quote
Old 04-19-2017, 07:37 AM   #18
poulrais
Board Member
 
poulrais's Avatar
 
Join Date: Sep 2006
Location: Quebec, CAN
Default

Quote:
Originally Posted by Marvelous3 View Post
Would it be a bad idea to t into the brake booster line instead? It's certainly big enough. I'm trying to avoid drilling a new port into the intake manifold.
Shouldn't the reference be pre-throttle plate?
poulrais is offline   Reply With Quote
Old 04-19-2017, 07:46 AM   #19
mopar318
Board Member
 
mopar318's Avatar
 
Join Date: Apr 2013
Location: Fort Wayne
Default

I would out the correct size hose in a see if it fixes the problem. Tial has a large piston and needs a lot of volume to to fill that chamber.
mopar318 is online now   Reply With Quote
Old 04-19-2017, 09:14 AM   #20
gross polluter
They see me trollin'
 
gross polluter's Avatar
 
Join Date: Dec 2008
Location: Cold Lake, AB
Default

Quote:
Originally Posted by poulrais View Post
Shouldn't the reference be pre-throttle plate?
I really hope you're kidding.
gross polluter is offline   Reply With Quote
Old 04-19-2017, 09:52 AM   #21
poulrais
Board Member
 
poulrais's Avatar
 
Join Date: Sep 2006
Location: Quebec, CAN
Default

Quote:
Originally Posted by gross polluter View Post
I really hope you're kidding.
My mistake. It's the wastegate's reference that has to be before the throttle plate.

My BOV is hooked after the throttle plate and my wastegate at the turbo outlet.
poulrais is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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 On

Forum Jump


All times are GMT -4. The time now is 12:03 PM.

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2017, vBulletin Solutions, Inc.