Wastegate Placement Question Single Or Change to Dual?
03-03-2015, 07:46 AM
#1
Wastegate Placement Question Single Or Change to Dual? Follow up question. Since I'm going to an SD tune, could I add a second 38mm gate, use the locations for the 02 sensors and weld the that wastegate flanges there? Any issues mounting the gate in the upright position or should I do a sharp angle towards the flow of the exhaust? I could cut and block off the flange location currently. From the pics of it on the old set up, I would have plenty of room(close on the waterpump) I planned on doing 2 O2 bungs on the exhaust when it's made (front bumper). Pics below.
Last edited by lower_the_dynamite; 04-02-2015 at 02:21 PM.
03-03-2015, 10:02 AM
#3
TECH Fanatic
This is a hotside of aluminized steel I just did for a friend. Its independent tubes so I had to jump off of each and merge again together for the wastegate. I tried to make it flowing it the direction of the exhaust where the gate tubes come off the main ones. Its a street car and this is a JGS 40mm wastegate with a s475 turbo.
IMO 2 wastegates is the best way but in this case my friend didn't wanna pay for two.
On your combo like already stated I think you need a 44-50mm gate to control boost. 38mm is petty small. This 40mm on this car is pretty small but will do for this particular setup.
IMO 2 wastegates is the best way but in this case my friend didn't wanna pay for two.
On your combo like already stated I think you need a 44-50mm gate to control boost. 38mm is petty small. This 40mm on this car is pretty small but will do for this particular setup.
03-03-2015, 11:58 AM
#4
This is a hotside of aluminized steel I just did for a friend. Its independent tubes so I had to jump off of each and merge again together for the wastegate. I tried to make it flowing it the direction of the exhaust where the gate tubes come off the main ones. Its a street car and this is a JGS 40mm wastegate with a s475 turbo. IMO 2 wastegates is the best way but in this case my friend didn't wanna pay for two. On your combo like already stated I think you need a 44-50mm gate to control boost. 38mm is petty small. This 40mm on this car is pretty small but will do for this particular setup.
03-03-2015, 12:51 PM
#5
TECH Fanatic
Trending Topics
03-04-2015, 08:26 AM
#9
Or just add a second 38. My 5.3 s480 had one of the 2 38s stick and boost in high gear or load would go over 20 with a 10 psi spring. With the second gate it sits right at 10 psi. If you are keeping the pipe divided a 2nd gate is optimal and if you decide to upgrade to a larger divided turbo in the future you will be set. (Also quickened spool keeping it divided)
03-06-2015, 08:43 AM
#10
On The Tree
the location shown in your pic will not work well at all unless you have a lot of back pressure going into turbo(which you should not) really need two split off manifolds, we had the same looking setup and would not work at all..
04-03-2015, 12:07 PM
#13
On The Tree
Join Date: Mar 2015
Posts: 199
Likes: 0
Received 0 Likes
on
0 Posts
WG placement would be best with the flow of the gasses w/o a hard turn or going the other direction for that matter even if you're most concerned about controlling the WG so depending upon your target boost levels you can run a small gate but you may get creep and only be able to run a low boost setting that is higher than you'd like.
I've had to run the WG off a manifold before that was almost 90* due to space restrcitions and it def/ made a difference when going from a 38mm Tial to a 46mm PTE WG obvioudly but it still worked ok for what i needed
I've had to run the WG off a manifold before that was almost 90* due to space restrcitions and it def/ made a difference when going from a 38mm Tial to a 46mm PTE WG obvioudly but it still worked ok for what i needed
04-03-2015, 12:29 PM
#14
To answer your question, and if I were you, I would take off the crossover, and modify it to add another 38mm wastegate. Here is a crossover that I helped design and build with a buddy of mine. His car has rock solid boost control, and I think the whole thing looks sweet. I am just jealous that his crossover is actually better than the one on my own vehicle. haha
