Boost controller question
May 31, 2018 | 06:10 PM
#22
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Joined: Nov 2017
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From: Bama
Jun 1, 2018 | 09:52 AM
#25
Here's the low down and skinny on why I believe the WG in the crossover works so well. The pressure in the whole hot side is aprx equal everywhere in the pipes. But in the crossover, the gas velocity is only from 4 cylinder, where it is nearly twice as fast at the same pressure just before the turbo since there is 8 cylinders worth of gas flowing through the same size tube.
Since the velocity in the crossover is much lower, it's much easier for that exhaust to change direction and exit via the waste gate and help to keep the overall system pressure the same. Right before the turbo it's going twices and fast and wants to go right past the wg.
Also, where I put them in the crossover is right before the 90* up turn and that will also be a slightly higher pressure area which help to "push" the exhaust out the wg.
I've built so many of these setup, that I believe I've more then proven it works great there! lol
Since the velocity in the crossover is much lower, it's much easier for that exhaust to change direction and exit via the waste gate and help to keep the overall system pressure the same. Right before the turbo it's going twices and fast and wants to go right past the wg.
Also, where I put them in the crossover is right before the 90* up turn and that will also be a slightly higher pressure area which help to "push" the exhaust out the wg.
I've built so many of these setup, that I believe I've more then proven it works great there! lol
Last edited by kbracing96; Jun 3, 2018 at 09:45 AM.
Jun 1, 2018 | 10:31 AM
#26
Thread Starter
On The Tree
Joined: Nov 2017
Posts: 121
Likes: 3
From: Bama
He's the low down and skinny on why I believe the WG in the crossover works so well. The pressure in the whole hot side is aprx equale everywhere in the pipes. But in the crossover, the gas velocity is only from 4 cylinder, where it is nearly twice as fast at the same pressure just before the turbo since there is 8 cylinders worth of gas flowing through the same size tube.
Since the velocity in the crossover is much lower, it's much easier for that exhaust to change direction and exit via the waste gate and help to keep the overall system pressure the same. Right before the turbo it's going twices and fast and wants to go right past the wg.
Also, where I put them in the crossover is right before the 90* up turn and that will also be a slightly higher pressure area which help to "push" the exhaust out the wg.
I've built so many of these setup, that I believe I've more then proven it works great there! lol
Since the velocity in the crossover is much lower, it's much easier for that exhaust to change direction and exit via the waste gate and help to keep the overall system pressure the same. Right before the turbo it's going twices and fast and wants to go right past the wg.
Also, where I put them in the crossover is right before the 90* up turn and that will also be a slightly higher pressure area which help to "push" the exhaust out the wg.
I've built so many of these setup, that I believe I've more then proven it works great there! lol
Jun 1, 2018 | 02:16 PM
#27
In the crossover work fine, easy to work and fabricate at that location.
1000’s are out there. Heck in be guessing over 3000. Just between Tricks and kb.
At the manifold is fine as well. If done properly.
There is not 1 thing that guarantees boost creep.
Except large engine, small gate, low boost, and no back pressure in the final exhaust system
Each system/build are unique.
I know of boost creep happen
At both locations.
Theres more to it then location.
Also springs setting are just a starting point.
Not an absolute.
1000’s are out there. Heck in be guessing over 3000. Just between Tricks and kb.
At the manifold is fine as well. If done properly.
There is not 1 thing that guarantees boost creep.
Except large engine, small gate, low boost, and no back pressure in the final exhaust system
Each system/build are unique.
I know of boost creep happen
At both locations.
Theres more to it then location.
Also springs setting are just a starting point.
Not an absolute.
Jun 2, 2018 | 12:51 PM
#28
Thread Starter
On The Tree
Joined: Nov 2017
Posts: 121
Likes: 3
From: Bama
In the crossover work fine, easy to work and fabricate at that location.
1000’s are out there. Heck in be guessing over 3000. Just between Tricks and kb.
At the manifold is fine as well. If done properly.
There is not 1 thing that guarantees boost creep.
Except large engine, small gate, low boost, and no back pressure in the final exhaust system
Each system/build are unique.
I know of boost creep happen
At both locations.
Theres more to it then location.
Also springs setting are just a starting point.
Not an absolute.
1000’s are out there. Heck in be guessing over 3000. Just between Tricks and kb.
At the manifold is fine as well. If done properly.
There is not 1 thing that guarantees boost creep.
Except large engine, small gate, low boost, and no back pressure in the final exhaust system
Each system/build are unique.
I know of boost creep happen
At both locations.
Theres more to it then location.
Also springs setting are just a starting point.
Not an absolute.
Jun 2, 2018 | 12:53 PM
#29
Thread Starter
On The Tree
Joined: Nov 2017
Posts: 121
Likes: 3
From: Bama
when you say no backpressure in system, is too much or none at all worse? I was planning on putting a boost referenced loud valve or electric cutout at the end of the down pipe, then running the old stock 3” exhaust/muffler I’ve got laying here from when I did cam and converter. I’ve drove this thing for almost a year with cam, longtubes, and corsa sport. Wanted it a little quieter for early mornin start ups In my neighborhood. Neighbors already hate me.
Jun 2, 2018 | 01:12 PM
#30
when you say no backpressure in system, is too much or none at all worse? I was planning on putting a boost referenced loud valve or electric cutout at the end of the down pipe, then running the old stock 3” exhaust/muffler I’ve got laying here from when I did cam and converter. I’ve drove this thing for almost a year with cam, longtubes, and corsa sport. Wanted it a little quieter for early mornin start ups In my neighborhood. Neighbors already hate me.
For this I’m speaking of after the turbo. You want it free flowing as much as possible. But you will need to work with what you have. And not split hairs.
3” full exhaust will give more BP then a 4” full exhaust.
If your cut out is at the end of your down pipe. When you open it your system will flow more like a 4” full exhaust maybe better.
Here the glitch. Watch your tune and watch boost control.
open and closed cut out. Be prepared for a boost rise when you open your cut out.
Each build is different. So your build is unique to your combo.