I do know that I drive torque, while listening to my friends prattle on about horsepower.
I've seen guys playing with a lawn mower throttle cable to control a vnt turbo on wheeling trips. One of the JDM toyota diesel guys has a vnt rigged into his diesel. He has the vanes open or about 1/8 shut on the trails when creeping and closes them fully on the highway once up to speed.
Quote from: macka on March 13, 2011, 11:00:24 amI've seen guys playing with a lawn mower throttle cable to control a vnt turbo on wheeling trips. One of the JDM toyota diesel guys has a vnt rigged into his diesel. He has the vanes open or about 1/8 shut on the trails when creeping and closes them fully on the highway once up to speed. that makes no sense.. so he has no boost at all on the trails, but is making like 15 psi going down the road when its not needed?vanes closed = 45psi if you arent careful (position at idle on a TDI)vanes open = 15-20 psi unless you REALLY got some fuel.. (position when @ WOT on a TDI)when they are open, they point about directly at the turbine.. basically at a 90* angle.when they are closed, the tip of one vane is about touching the tip of the other vane.. not even pointing towards the turbine.if you close the vanes on a VNT and really get on it, there will be soo much EMP, and boost that something will let go. i blew a head off a block at one point, because i closed the vanes on my turbo too much, they werent even fully closed..with the vanes fully closed, your engine will make 30 psi by 1800 rpms, but not have ANY POWER at all.. theres too much pressure holding it back..
Rabbit on Roids, you one of the few guys on here that really gets it.Proud of ya
The John Deere system for there VGT (Variable gate Turbo) which is similar to the VNT turbos, use a eletronic stepper motor to operate the gate(vanes).They use a load sensing system based on transmission outputwhen you are goin full throttle under full load, they are NEVER closed!They only close at idle, I've watched the screen when doing power tests. idle closed, load and hit the throttle, they open just slightly like 80 percent closed, then as the motor revs up they open more, the more load the more open they are because you so much fuel goin into the engine. at full throttle as the load backs off they only close if and I mean if boost drops from less fuel, but that hardly ever happens. THis is why I am tryin to get my wastegate to open more on the highway. I want less boost under light load, a nice balance between boost and exhaust backpressure.
I wonder if a T3 would be better for highway cruising, must flow waaay better through the larger turbo. than my T2. hmm wonder if its a bolt on
The John Deere system for there VGT (Variable gate Turbo)...