I havent seen any good threads yet cause all im findin is a bunch of long non informational threads with no pictures or nig rigged springs and levers

can i just weld the vanes to a certain position i dont really need it to spool fast cause its on a pulling truck?

HTT has a turbo that they dont list a compressor size but if you look for stage III upgrade it says 2.5 for $1500 for the whole setup without accuator and bigger exhaust housing

hers the best one i could find of mechanical,not best quality
next best but doesnt show how its made

 

why would you want to even try to compete with a 351vgt charger? ide rather have the factor hx. it will last longer.

 

so many blown up hx's i still have exhaust wheels rolling around in the exhaust and a shiny new intercooler..... thats my reasoning

 

why would you bother welding the vanes in a certain spot...if you're just going to do that, just get a HE351cw and increase the wastegate puck clearance and maybe enlarge the gate a bit...

has the same compressor side as the VGT...just has a gate instead of vanes..

 

If your pulling you would only need to move the actuator one way to begin with.When your at the line you'd have it all the way open(not restricted) and when you end you might have to close it up so you don't lose it the way the big turbo's do when they lose engine RPM's.If you spin out you wouldn't have to worry about it at all.It has to do w/exhaust output pressure.More fuel more air more boost.But if you loose one you loose them all.That what you see when here at the pulls.Loss of exhaust pressure to turn/spin the turbine wheel and thats whats all the fuss is about.And that is what the VGT is trying to do maintain air flow and adjust compensate for exhaust flow.You expect this much so the VGT moves to keep at that much.What I don't know is the air flow number's for the 3,4,5 and 6 turbo's all the way closed and all the way open sort of a minimum/maximum air/exhaust flow.I'm sure someone has gooten that by now

 

If I were to use the mechanical control would it throw the vanes open at full spool and then tighten them up as the rpm falls at the end of the run? I dont really know if it works like that or the drive pressure tightens them up as it spool

 

It is controlled on a Cummins VGT engine by the controller and ECM.W/the electronics outta the picture and a manual controller connected you would be controlling the open and closing of the turbo.The way this turbo is designed it uses fingers similar to the heater motor in your truck.These fingers slide thru a plate one way is closed and the other way is open.It doesn't care what the drive pressure is other than shaft RPM's.The higher the RPM's the Higher the risk of breakage.These turbo's are good in the 80-100,
000 RPM range turning them more than that is risky.I can say if your juiced up that the
HV351 will be to small and you should be trying to find a HV451 at least.And that will mean making an adapter from your manifold to the mounting flange of the turbo because the turbo bolt pattern is bigger than your manifold.The reason for the VG is to controll the amount of air going into the engine.W/the turbo closed the air flow is restricted/limited,w/the turbo open air flow is at it's highest.Which the difference between a non VGT turbo which relies on exhaust flow to make more intake air pressure.The VGT is used to controll the amount of air going into the engine.On a pulling application your aready able to use all of the air flow at the start and as long as the engine RPM's don't fall you would be able to leave the turbo at full air or open.If the rpm's fall then you would have to close the turbo to keep the air flow at it's max,but that will be a play by ear thing because as you close the turbo you also reduce the air that it gives the engine.You can't think of boost pressure but of how much air is flowing to the engine.More fuel = more air flow into the engine.Heavy black smoke = not enough air flow into the engine and wasted fuel and lost power.You don't want black smoke going down the track no matter what your seeing everybody else doing.I use to tune a stock truck w/a 400 sb chevy so I know alittle about truck pulling.The guys that I used to pull against aren't any smarter the when I pulling against them.Also if your not running head studs and have the head o-ringed you will blow the head gasket w/this much turbo.It takes a combination not one thing or another.Hope this helps