This has been gnawing at my brain for i don't know how long. How do you convert a internal wastegate to an external. I heard the externals are better at controling boost and you get that awesome phhhhhhhhhhsssssss sound.If someone could tell me how to convert one i would greatly appreciate it.

 

How? well you can take the wastegate flapper out of the internal housing on the turbo, and run a pipe and weld a flange directly on to that... Or you can weld that hole shut, and plumb a pipe off the manifold..

You dont get a neat Pshhhh sound when running a open wastegate, in fact it sounds like a big exhaust leak blowing open.. I think it sounds like ----.

Jeff

 

lol...... thanks for the directness jeff. So would i be better off with the external or the internal wg. I don't care about the sound ,when it comes to it, as long as it can do the job and do it well.

 

Well it depends on a few things, what turbo? does it already have a internal gate? How much boost are you gonna run etc etc? Remember external gates cost around 250 plus all the flanges and piping to make it closed loop. I think internal gates work fine for anything less than 12-15psi.

Jeff

 

Well im only going to run about max 15 psi depends with how everything turns out but thanks for your help and info its a great help

 

in this country (england) external 'gates are rare, we have always used internal w/g's .. even on 200mph 520bhp ford sierra cosworths (xr4ti with a twin cam 2.0 turbo engine).. ive never had a serious fault with them, apart from the housings cracking sometimesand thus the valve not sealing..

on another note, those external 'gates look a LOT like some of the "pressure reducing valves" used on the hospital sterilizers i service for a living...

 

Hell, we're running 19-23#'s of boost on my bud's T-3 equppied Fairmont. He's solidly in the 9's (9.89 to be exact) on INTERNALLY wastegated Ford thunderbird (garret) T-3's.
Trust me, save the money on the externals and use it towards other car parts (like traction)

 

I'm not saying they wont work at those levels, because their are lots of cars that have some serious HP with internal Gates.. Its just something I prefer for controlling boost.

Jeff

 

well actually my turbo came off a thunder bird as for traction i bought a full suspension kit w/. the sway bars and just recently installed the sway bars and being as low and wide as a fiero is that thing grips like a pit bull