benefit of dump valves
19 September 2003, 09:15 PM
#1
Scooby Regular
Thread Starter
Join Date: Sep 2003
Posts: 31
Likes: 0
Received 0 Likes
on
0 Posts
Hi all,
i want get rid of the turbo lag between gear changes will a dump valve make a big difference or is it purely a cosmetic/sound nice mod!
Any suggestions on what type to go for?
Bakes
i want get rid of the turbo lag between gear changes will a dump valve make a big difference or is it purely a cosmetic/sound nice mod!
Any suggestions on what type to go for?
Bakes
19 September 2003, 09:43 PM
#2
Scooby Regular
Join Date: Nov 2003
Location: where the wild roses grow
Posts: 5,122
Likes: 0
Received 0 Likes
on
0 Posts
Say what? If you own an Impreza, your car already has a dump valve fitted as standard.
You're correct in thinking the vast majority of aftermarket valves are more about cosmetics and noise than anything else.
There are some that will go some way to reducing pressure loss during gear changes if adjusted appropriately (i.e. they hardly open at all), but the downside of this is a reduction in turbo working life.
TBH the best way of eliminating boost loss during gearchanges is to eliminate the DV completely, although how long your turbo will last in this state is anyone's guess.
You're correct in thinking the vast majority of aftermarket valves are more about cosmetics and noise than anything else.
There are some that will go some way to reducing pressure loss during gear changes if adjusted appropriately (i.e. they hardly open at all), but the downside of this is a reduction in turbo working life.
TBH the best way of eliminating boost loss during gearchanges is to eliminate the DV completely, although how long your turbo will last in this state is anyone's guess.
20 September 2003, 08:38 PM
#6
Scooby Regular
Join Date: Jul 2005
Posts: 12,329
Likes: 0
Received 0 Likes
on
0 Posts
Prehaps the dump valve is dying or if a recurculating type the diagphram?? is kaput...
Gm ? was that tounge in cheek?? about removing it...
given that your stance seems to be preserving scoob engines
mart
Gm ? was that tounge in cheek?? about removing it...
given that your stance seems to be preserving scoob engines
mart
20 September 2003, 08:48 PM
#7
Scooby Regular
Join Date: Nov 2003
Location: where the wild roses grow
Posts: 5,122
Likes: 0
Received 0 Likes
on
0 Posts
No Mart, the "removal" comment was not tongue in cheek, it is correct as it stands. Removing the DV completely will produce less lag than running with one - albeit, as stated, at the cost of turbo working life.
You are correct, my personal preference is to avoid modifications that unnecessarily prejudice the reliability of the engine. I was not advocating the removal of the DV, merely illustrating the realities of the situation to Bakes.
You are correct, my personal preference is to avoid modifications that unnecessarily prejudice the reliability of the engine. I was not advocating the removal of the DV, merely illustrating the realities of the situation to Bakes.
Trending Topics
22 September 2003, 01:38 PM
#9
Scooby Regular
Join Date: Aug 2003
Posts: 1,301
Likes: 0
Received 0 Likes
on
0 Posts
Bake
Are you talking about actual lag or changing too early and dropping the engine out of the boost window ?
My STi seems to have very little noticeable lag compared to my EVO. To feel for lag, close the throttle at about 5k rpm for about 5s then open it fully (try it down a hill so the revs don't drop). In the EVO you could feel a definite delay, in the STi, its much less noticeable.
Fit a better exhaust/cat to increase the boost window.
Are you talking about actual lag or changing too early and dropping the engine out of the boost window ?
My STi seems to have very little noticeable lag compared to my EVO. To feel for lag, close the throttle at about 5k rpm for about 5s then open it fully (try it down a hill so the revs don't drop). In the EVO you could feel a definite delay, in the STi, its much less noticeable.
Fit a better exhaust/cat to increase the boost window.
Thread
Thread Starter
Forum
Replies
Last Post
shorty87
Full Cars Breaking For Spares
19
22 December 2015 11:59 AM