BlackSkyRacing
Living Under a Rock
- Joined
- Mar 22, 2007
- Messages
- 1,394
Hey! I don't know when all you guys started toying with VGTs but y'all are late to the scene...me and a friend pulled an all-nighter about 4 years ago and installed a HE431V on his '98 12 valve and it's been on ever since and works well...so now I'm just gonna give up! :bow: Good luck guys...keep toying around maybe someone will soon build a controller! :Cheer:
Did you share with the class though? Guess I still wasn't on here 4 years ago though... Heck I've only owned the truck for 3 :doh:
Oh and my 451 will close down enough for EB... I found that out the hard way when I took my truck for it's first test run. Wouldn't accelerate very good but it slowed down pretty darn good. BTW did your 431 have a billet wheel in it that looked to be extended tip???
Good to see someone else doing this. I have just recently put one of these turbo's on my 03 CR Dodge using a stock waste gate actuator to open and close the collar.(I say collar, because it is a VGT, not a VVT, the vains don't move, the geometry does).
Anyways, I have had pretty good luck with my setup and will gladly help out anwering any questions, but will throw out a few things I have found:
First off, you don't want to run things off drive pressure. That would kill your spool up. The boost reference lets it stay almost closed were it idles with 1-2psi of, about 12psi of back pressure. You have to have some drive pressure to get quick spool up, hence the whole purpose of this turbo. As boost builds, the collar opens and back pressure drops to around 1:1, depending on how touchy your actuator is set up.
Second, the lever must have some sort of notch that has to be past to go into exhaust brake mode. No matter how I set up the actuator, it would never fully close. It seems to need just a little more, like an 1/8" click to get it to go all the way back. This actually works out well, because you don't want it to shut all the way every time you let off the pedal. I am going to rough it for now and just rig up a manual cable to click it into exhaust brake mode when needed. Lets face it, if you couldn't get the exhaust brake to work it would defeat half the purpose.
And lastly. I have my actuator opening at about 4psi. Boost is literally instant. I can easily hit 17psi or more just cruising around town in Tow/Haul mode. Egts are great, cool down isn't bad, but will improve greatly when I get the coolant plumbed in. The sound out the exhaust is like nothing else, especially when the exhaust brake is activated. And at idle, the exhaust brake keeps egts over 500*, which makes for fast warm ups in the winter.
All I have for now.
I know that my waste gate actuator doesn't start to move until about 10-12psi of boost and it has enough spring to it that it will pull my 451 into EB mode. I'm thinking that with something holding it partly open it will increase the spring load hence increasing the opening pressure (on the stock turbos they open at 19.3psi).
So I think a pull-type solenoid, some sort of adjustable arm and a dump valve (to dump the drive pressure) and the EB mode would work. That and I think it would run on drive pressure if the opening pressure was set somewhere around 20psi... Keeping in mind the pressure to open further increases as it opens and I extended the arm on my turbo so it doesn't open as fast either :Cheer: Oh and the needle valve idea works too, I have one inline on mine as is running on boost to delay the action of the housing opening AND closing.
Last edited: