TT , twin waste gates, Greddy profec oled boost controller help!!! - Page 2 - MY350Z.COM Forums



Reply
 
 
 
Thread Tools Search this Thread
Old 03-06-2017, 01:25 PM   #21
Cux350z
hatersgonnahate
iTrader: (162)
 
Cux350z's Avatar
 
Join Date: Apr 2005
Location: Greenville, SC
Posts: 11,424
Thanked 177 Times in 131 Posts
Default

Yeah the 479 made no sense...my haltech reading is under 1.00 typically

Quote:
Originally Posted by tcode View Post
What happens with little partial throttle? Isn't very possible having 0 psi in the intake manifold, while 15 psi of compressed air in front of throttle body? That condition is potentially dangerous, your turbo will spin. A lot, and too much.
your BOV opens in that condition. Its vac line is Post TB and works like a wastegate as well. the 15psi will open the BOV and relieve itself.
Cux350z is offline   Reply With Quote
Old 03-07-2017, 01:36 AM   #22
tcode
Registered User
iTrader: (7)
 
tcode's Avatar
 
Join Date: Jul 2012
Location: EU/Croatia
Posts: 331
Thanked 5 Times in 2 Posts
Default

Even worse. And I'm not concerned about pre TB pressure. It's about turbo overspin, because your target boost signal is taken at wrong place. Turbo will be forced to overspin because it will never get the "boost target".
tcode is online now   Reply With Quote
Old 03-07-2017, 04:45 PM   #23
Cux350z
hatersgonnahate
iTrader: (162)
 
Cux350z's Avatar
 
Join Date: Apr 2005
Location: Greenville, SC
Posts: 11,424
Thanked 177 Times in 131 Posts
Default

Quote:
Originally Posted by tcode View Post
Even worse. And I'm not concerned about pre TB pressure. It's about turbo overspin, because your target boost signal is taken at wrong place. Turbo will be forced to overspin because it will never get the "boost target".

why would it overspin? That 15psi will also open your wastegates (depending on spring setting) and since your boost controller should be fed from post TB, it will have 0 boost to help keep the WG shut...even at 100% dc on the boost solenoid valve.

I don't think your scenario is possible for extended amounts of time....its a transient state.
Cux350z is offline   Reply With Quote
Old 03-15-2017, 08:55 PM   #24
SAMzG35
Registered User
 
Join Date: Feb 2012
Location: Fort Crack Homiie
Posts: 98
Thanks: 0
Thanked 1 Time in 1 Post
Default

Reading this making me think twice about my current setup. The bottom nipple on my waste gate is connected to the vacuum/boost source on the plenum which is after TB. What difference is it going to make if i connect it before TB?
SAMzG35 is offline   Reply With Quote
Old 03-15-2017, 09:54 PM   #25
bealljk
Registered User
iTrader: (13)
 
Join Date: Apr 2010
Location: col
Posts: 1,947
Thanked 60 Times in 57 Posts
Default

Define bottom and top nipple?

I would think it'd make a big difference ...

if you are about to shift at 6000 rpm and youre at 14psi of boost and your TB shuts, your charge pipes (for a brief second until the bov opens) are pressurized while while your plenum is in vacuum - where do you want pressure and where do you want vacuum at that moment when you shift in your waste gates?

I would think you'd want pressure pushing open simultaneously while vacuum pulling open the waste gates to allow exhaust to bypass your turbine? This is how I understand it...

Last edited by bealljk; 03-15-2017 at 09:56 PM.
bealljk is offline   Reply With Quote
Old 03-16-2017, 10:04 AM   #26
SAMzG35
Registered User
 
Join Date: Feb 2012
Location: Fort Crack Homiie
Posts: 98
Thanks: 0
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by bealljk View Post
Define bottom and top nipple?

I would think it'd make a big difference ...

if you are about to shift at 6000 rpm and youre at 14psi of boost and your TB shuts, your charge pipes (for a brief second until the bov opens) are pressurized while while your plenum is in vacuum - where do you want pressure and where do you want vacuum at that moment when you shift in your waste gates?

I would think you'd want pressure pushing open simultaneously while vacuum pulling open the waste gates to allow exhaust to bypass your turbine? This is how I understand it...

Top is top, bottom is bottom LOL
Top is what connects to boost controller, bottom is what connects to manifold pressure as far as I know. I went by the instructions with the turbo kit and boost controller.
I do see your point though, you might be right. I'm gonna try to redo mine and see if it makes any difference. The sound the car makes when I let off throttle does sound a bit like compressor surge, so this might be a fix. Took it to few shops and they said its normal.

Turbo kit


Boost controller
Attached Thumbnails
TT , twin waste gates, Greddy profec oled boost controller help!!!-wg.png   TT , twin waste gates, Greddy profec oled boost controller help!!!-wg2.png  
SAMzG35 is offline   Reply With Quote
Old 03-16-2017, 12:31 PM   #27
bealljk
Registered User
iTrader: (13)
 
Join Date: Apr 2010
Location: col
Posts: 1,947
Thanked 60 Times in 57 Posts
Default

Quote:
Originally Posted by SAMzG35 View Post
Top is top, bottom is bottom LOL...Took it to few shops and they said its normal.
You're smart for recognizing a potential problem.

My waste gates are upside down... so top is bottom and bottom is top...I got top and side...

keep us updated on wjat you find out
bealljk is offline   Reply With Quote
Old 03-16-2017, 01:08 PM   #28
Cux350z
hatersgonnahate
iTrader: (162)
 
Cux350z's Avatar
 
Join Date: Apr 2005
Location: Greenville, SC
Posts: 11,424
Thanked 177 Times in 131 Posts
Default

Quote:
Originally Posted by SAMzG35 View Post
Reading this making me think twice about my current setup. The bottom nipple on my waste gate is connected to the vacuum/boost source on the plenum which is after TB. What difference is it going to make if i connect it before TB?
Exactly as i said before. Post TB will cause the WG to stay shut...where is the air going that the compressor is providing? Through the pipes and out the BOV..hopefully.My single BOV is only good for a certain CFM.

POST tb is for the boost solenoid/map sensor.

Pre TB is for the bottom of the WG so that they open up while the bov is venting the charge pipes.

Bottom/Top port is relative to the actuator head vs the valve body, not in how it is mounted on your car. It is a poppet valve with spring assist closure.

Cux350z is offline   Reply With Quote
 
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

Forum Jump


All times are GMT -8. The time now is 02:04 PM.


Copyright 2002 - 2008, MY350Z.COM All Rights Reserved.