Show full size 924Board.org
Discussion Forum of 924.org
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
 Technical FAQ924 FAQ (Technical)   Technical924 Technical Section   Jump to 924.org924.org   Jump to PCA 924 Registry924 Registry

Replacing or refurbing wastegate (Tial, perhaps?)
Goto page Previous  1, 2, 3
 
Post new topic   Reply to topic    924Board.org Forum Index -> 931 Tech.
View previous topic :: View next topic  
Author Message
bureau13  



Joined: 07 Sep 2017
Posts: 203
Location: South Florida

PostPosted: Thu Nov 28, 2019 11:33 am    Post subject: Reply with quote

Right, about spring rate, of course that would make it different. Just trying to get an idea of, say stock US spring of 0.5 bar or so, what my boost would be limited at. I know the wastegate is supposed to be operated with the control line in place, but exhaust backpressure will crack it open at some point.

Carrera RSR wrote:
All depends on the waste gate spring installed.......0.5, 0.7, 1.0 bar boost springs?? Needs boost line pressure to control the valve, not exhaust

_________________
-----------------------------------------
1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)
Back to top
View user's profile Send private message
Fasteddie313  



Joined: 29 Sep 2013
Posts: 1853
Location: MI

PostPosted: Thu Nov 28, 2019 5:35 pm    Post subject: Reply with quote

I think it depends a lot on your setup..

How big your WG is, how much backpressure your turbo makes where, Your VE, etc..

The 931 has a very big WG, so extremely high boost with no line attached I think..

I don't know, have never tried it, but I don't think their is any end in reasonable sight..
_________________
80 Turbo - Slightly Modified
Back to top
View user's profile Send private message Yahoo Messenger
CÚdric  



Joined: 27 Aug 2004
Posts: 1931
Location: Sweden

PostPosted: Thu Nov 28, 2019 5:56 pm    Post subject: Reply with quote

bureau13 wrote:
Right, about spring rate, of course that would make it different. Just trying to get an idea of, say stock US spring of 0.5 bar or so, what my boost would be limited at. I know the wastegate is supposed to be operated with the control line in place, but exhaust backpressure will crack it open at some point.

Carrera RSR wrote:
All depends on the waste gate spring installed.......0.5, 0.7, 1.0 bar boost springs?? Needs boost line pressure to control the valve, not exhaust


Based on my experience with a popped of boost control line i dont think you will ever experience the point where the WG self opens, RIP stock engine

If you measure or calculate the spring rate of the WG spring its not that hard to make a fairly good calculation of the needed back pressure based on that and the WG valve area. But it will probably end up in a very big number.
_________________
┤80 924 Turbo
Back to top
View user's profile Send private message MSN Messenger
bureau13  



Joined: 07 Sep 2017
Posts: 203
Location: South Florida

PostPosted: Fri Nov 29, 2019 3:11 am    Post subject: Reply with quote

Interesting. Thanks for the info, guys.
_________________
-----------------------------------------
1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    924Board.org Forum Index -> 931 Tech. All times are GMT + 11 Hours
Goto page Previous  1, 2, 3
Page 3 of 3

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group