jdgleason
Active member
I would assume pressure would be effected more in the up pipes themselves.... either way
Gating around the VGT.
- Thread starter White_monster
- Start date
I would assume pressure would be effected more in the up pipes themselves.... either way
madman1234509
New member
Ive always wondered his, and will be doing this with my build. I understand the cost thing and guys using stock up pipes, or modified stock up pipes where they dont want to put another pipe on an up pipe. Gating around the VGT into the down pipe just seems like such a waste, and some where along the line they started doing this.
Im not going to have a "kit" for my build but do plan on gating, both up pipes, around the HP turbo and into the hot pipe between the HP and LP turbo. There will also be another gate installed on the hot pipe to gate around the atmo if its needed with the 100% nozzles and possibly some nitrous. So Ill have 2 40mm gates, one off each up pipe, and 1 50mm gate gating around the atmo if needed. Its probably overkill to have 3 gates, but wanted to try it.
Im not going to have a "kit" for my build but do plan on gating, both up pipes, around the HP turbo and into the hot pipe between the HP and LP turbo. There will also be another gate installed on the hot pipe to gate around the atmo if its needed with the 100% nozzles and possibly some nitrous. So Ill have 2 40mm gates, one off each up pipe, and 1 50mm gate gating around the atmo if needed. Its probably overkill to have 3 gates, but wanted to try it.
Powerstroked162
On Da Juice
madman1234509
New member
Im sure, but I figured Id try it.... The worst case is just to change it after. 1 gate tied into both up pipes or something
It doesnt fully equalize I havent put a back pressure sensor in both uppipes but if you are gating allot of pressure the opening in the turbo wont flow enough to equalize.
On my set up I was comanding 15 percent min duty cycle and then using the gate to control back pressure. I had enough heat in the gate to turn the top gold and still had back pressure issues. I.e blowing uppipes at the flange.
Making 75 psi boosy with maxxed out back pressure sensor
Im now back to 2 % vgt gate is closed making 73 psi boost 73 psi back presure and the atmo turbo making 32 psi.
I know its not the same as high/maxx powers but thats what ive learned. Im also not blowing left side uppipes anymore either.
Best thing to do is raised desired back pressure a little but still let the vgt go all the way open.
For example stock turbo trucks do well with about 55 psi desired back pressure.
My truck like 65 psi desired. It makes thr high pressure come on hard and then opens and feeds the low pressure nicely and controled. My backpressure almost mirrors desired but also rememeber my atmo turbine is big compared to most
Sent from my SCH-I545 using Tapatalk 2
On my set up I was comanding 15 percent min duty cycle and then using the gate to control back pressure. I had enough heat in the gate to turn the top gold and still had back pressure issues. I.e blowing uppipes at the flange.
Making 75 psi boosy with maxxed out back pressure sensor
Im now back to 2 % vgt gate is closed making 73 psi boost 73 psi back presure and the atmo turbo making 32 psi.
I know its not the same as high/maxx powers but thats what ive learned. Im also not blowing left side uppipes anymore either.
Best thing to do is raised desired back pressure a little but still let the vgt go all the way open.
For example stock turbo trucks do well with about 55 psi desired back pressure.
My truck like 65 psi desired. It makes thr high pressure come on hard and then opens and feeds the low pressure nicely and controled. My backpressure almost mirrors desired but also rememeber my atmo turbine is big compared to most
Sent from my SCH-I545 using Tapatalk 2
madman1234509
New member
Yea, I wont have a VGT so I'm going to be totally reliant on a/r and my gates to keep bp down. My s366 has a .9 a/r and my 88mm gt4718 has a 1.39 a/r... The s366 is going to be ran hard with 100% nozzles so that's why I wanted to have more than enough gate, rather than using one up pipe with a gate to try and get it done.
bft blue oval boys
Active member
Is there a build thread on your truck? Sounds like it's gonna be a beast
Sent from a Cummins plant, driving a TDI, wishing it was a Powerstroke
madman1234509
New member
I haven't started anything. I was just about ready to start the build and sold my '08 that had all the basics and head studs done for a bone stock Harley Edition 2010 back in March. Been saving parts for about 2 years. Just picked up some head studs again. All I need to get the build under way is a torque converter, and top mount alternator for use with my dual fueler kit. There are a few other things I could use, push rods/valve springs. But they are always things I can go back in a do afterwards.
mike@haller's
New member
Ive recently found that commanding the desired bp to make the vanes do what you want seems to work the best as well. on my drag truck i command 75psi of bp at low rpm and go lower at high rpm. this keeps the high pressure cranking hard the whole time. combined with two 44mm gates one of each manifold to atmoshere i can keep bp at 70 psi at all times running 50psi of boost. whether its on fuel or nitrous.
i also have a truck with max powers that has a bp file that will bring it to 75 psi at the shift then drop to 65psi and rebuild to 75. and makes 65psi of boost all with no gating happening.
i also have a truck with max powers that has a bp file that will bring it to 75 psi at the shift then drop to 65psi and rebuild to 75. and makes 65psi of boost all with no gating happening.
