So Mike with my piping I have a gate off the drivers side up pipe that dumps under the trans into the down pipe. This gate should open first and then set the other gate that dumps from the passenger up pipe to between the turbos should open about 5psi higher, or whatever helps drivability. Would it be possible to open the upper gate earlier to start spooling the big turbo earlier?
Now the next thing I have a question about. What boost controller(s) is everyone using? Just stay with the regulators or is any one using the ams1000 digital boost controller? I was talking to Sebastien at NLR Systems and he has a new controller coming that can adjust the gates to different pressures depending on the setup of the controller. You use a laptop to set it up. Just throwing this info out there as it might allow us to really tweak things for the bottom end and vary it for the top end and in between.
I have used the AMS 500 controllers. And they are very nice. But I personally prefer the S.A.E. method. Simple And Effective. So I use a 200 psi air regulator to control the boost to the gate. The reason being that you can more precisely dial in the boost going to the gate. Spring pressure in the gate is also very important in making it work right.
Every setup is slightly different so where you set your gates will most likely be a little different. First you need all the info you can get. Total boost, boost from the low pressure and back pressure .This is where dustins boost harness to the dashdaq becomes invaluable.
What I would do first is force close the gate going between the turbos by applying full boost to the top port. Then set the gate to atmosphere to open almost immediately to dump all the drive pressure. Then slowly adjust the regulator in till desired boost and back pressure are found. After each run refigure the pr for each turbo. If your high pressure is becoming to high, this is when you will need to start cracking the gate between stages to help slow it down. Of course once you change that gate you need to start over with the gate to atmosphere. Which is why this takes hours to do and requires lots of patience.
In my experience letting the high pressure turbo have as much drive pressure as possible down low, lets the chargers hit very hard and gets the truck moving much faster. I think once I can get someone to make the tune to control the vgt duty cycle the way I want were going to see even better response and driveability from these setups. Hope this helps.
