![]() |
Originally Posted by Chuck33079 He is supercharged. You want it open at idle. You're correct for turbo cars. could you explain why? i have always been under the impression that
|
![]() |
|
LinkBack | Thread Tools | Display Modes |
|
![]() |
#1 (permalink) | |
A True Z Fanatic
Join Date: Apr 2012
Location: San Diego CA
Posts: 1,103
Drives: Classified
Rep Power: 15 ![]() ![]() ![]() |
![]() Quote:
i have always been under the impression that centrifugal superchargers are basically belt driven turbos, so wouldnt anything that applies to a turbo setup apply to a supercharger setup(except for obvious stuff like boost controllers and other turbo specific parts) |
|
![]() |
![]() |
![]() |
#2 (permalink) | |
A True Z Fanatic
Join Date: Jan 2012
Location: Dallas/Ft.Worth
Posts: 3,349
Drives: Noisily.
Rep Power: 21 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() Quote:
The turbo can just spin freely in the relative vacuum created by being off boost, so it isn't an issue, the supercharger effectively functions as an air restrictor in a feedback loop... limit air, engine slows down, engine slows down, supercharger spins slower, air is more limited, repeat. There are ways to compensate around it, but the simplest is to leave the BOV open. And I refuse to use a different acronym for BOV simply to differentiate between recirc and non-recirc. :P |
|
![]() |
![]() |
![]() |
#3 (permalink) | |
Not an active Vendor. DO NOT BUY
Join Date: Sep 2009
Location: California
Posts: 391
Drives: '13 Hot Lava FR-S
Rep Power: 17 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() Quote:
A turbocharger's rpm, however, is dictated by exhaust flow. At low rpm and/or low throttle angles, there is insufficient exhaust gas flow to spin the turbocharger fast enough to develop boost. Therefore, the pressure in the charge pipe will not be significantly higher than the pressure in the intake manifold and the bypass valve will remain closed. I hope that clears things up for you. |
|
![]() |
![]() |
![]() |
#4 (permalink) | |
A True Z Fanatic
Join Date: Jan 2012
Location: Dallas/Ft.Worth
Posts: 3,349
Drives: Noisily.
Rep Power: 21 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() Quote:
Thanks Mike! ![]() |
|
![]() |
![]() |
![]() |
#5 (permalink) | ||
A True Z Fanatic
Join Date: Apr 2012
Location: San Diego CA
Posts: 1,103
Drives: Classified
Rep Power: 15 ![]() ![]() ![]() |
![]() Quote:
i use to do the same all the time but i kept getting corrected by friends so i started using BPV and BOV Quote:
could you in theory have a BPV designed for a turbo to work with a supercharger assuming everything fits? or would you need a different valve? |
||
![]() |
![]() |
![]() |
#6 (permalink) | |
A True Z Fanatic
Join Date: Jan 2012
Location: Dallas/Ft.Worth
Posts: 3,349
Drives: Noisily.
Rep Power: 21 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() Quote:
With the supercharger, boost is continuing to be generated at idle, so that differential is such that it holds the valve open slightly to release that pressure back to the pre-S/C pipe. Get it? |
|
![]() |
![]() |
![]() |
#7 (permalink) | |
A True Z Fanatic
Join Date: Apr 2012
Location: San Diego CA
Posts: 1,103
Drives: Classified
Rep Power: 15 ![]() ![]() ![]() |
![]() Quote:
|
|
![]() |
![]() |
![]() |
#9 (permalink) |
Track Member
Join Date: Nov 2010
Location: DFS
Posts: 900
Drives: ???
Rep Power: 55 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]()
New valve is on, BUT, still missing boost. As soon as the traction fluid is warm the boost goes away.
If I WOT as soon as the oil temp is 160 I get 3 PSI at 3K 15 minutes later I get ZERO boost at 3K outside temp is 75F I looks like I may need a new supercharger. I have found other rotrex failures over at the BMW sight. A lot of talk about overspeeding the SC causing the problem, and the user I bought mine from had the smallest pulley GMT makes on it with the stage 1 intake. He may have fried the unit and then sold it to me. As I did my install in the winter, the fluid was cool enough to keep the boost up. I am working with Sam and Mike to come up with a solution. ![]()
__________________
It's not my fault I'm old, I was born a very long time ago! |
![]() |
![]() |
![]() |
Bookmarks |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
4.08 and boost | whoLEEoh | Engine & Drivetrain | 16 | 12-07-2015 08:08 AM |
Boost vs. RPM | DIGItonium | Forced Induction | 39 | 06-17-2013 09:23 AM |
Am i Missing Something? | Whitemtl370 | Nissan 370Z General Discussions | 9 | 01-18-2012 02:13 PM |
Need Mic Boost? | Osiris | Audio & Video | 6 | 07-14-2010 03:43 PM |
Something is missing | SophiaZ | Exterior & Interior | 11 | 01-20-2010 09:08 PM |