Rallye_Mark
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 posted on 13/12/10 at 08:35 PM |
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Internal to External Wastegate?
Hey everyone,
for my turbo to fit nearly within the standard bodywork I would need to remove the Internal wastegate and actuator as it is the actuator that will
poke out to far. I've been doing some reading but would like to know other peoples opinions is it as simple as...
Remove the internal flaps from the wastegate and remove the shaft that it runs on, weld the small hole up, then fit an external wastegate to the
exhaust manifold before the turbo?
Also for IVA, would the flow from the external wastegate need to be fed back into the exhaust system or could I have it running into the
atmosphere/screamer pipe?
Cheers Mark.
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PSpirine
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| posted on 13/12/10 at 09:36 PM |
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I thought you weld the flap up, not remove it! (otherwise you'll get gasses bypassing the turbine)
As for how you vent it, you need to consider the noise of an open wastegate at full chatter..
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Antnicuk
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| posted on 13/12/10 at 10:09 PM |
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i dont think you would get through the iva without the screamer plumbed in. As for the actuator, you can move them around a bit as its only a bar
operating an arm so you have quite a range of movement, it just means making a longer/shorter arm and new brackets.
Thats what i did with my first turbo but then i went for an external w/g, which as you say is just taken off the manifold before the turbo, but you
need to take into account the flow direction of the exhaust gasses. On the internal w/g, I just attached a flat piece of metal with a hole in it over
the waste gate door lever and then welded the other end to the exhaust housing holding it shut, that way if i wanted to revert back i just need to
grind the flat bar off. If you remove the door you wont spool the turbo as the gasses will go through the hole instead of through the turbine wheel.
600 BHP per ton, Stylus Brought back from the dead! Turbo Rotary Powered!
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Stott
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| posted on 13/12/10 at 10:13 PM |
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For IVA then you would deffo need the waste put back into the exhaust. It would prob pass noise as it would be off boost at the no load 3/4 max rpm
test but the fact the tester could see there is an un silenced exhaust part and the fact that the emmisions at this point would be un catalysed (if
necessary) would cause them to fail it IMO.
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StrikerChris
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| posted on 13/12/10 at 10:14 PM |
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I think in theory your correct,a screamer pipe is called that for a reason tho!be bloody loud (and annoying) in an open top car!I was amazed how loud
my standard wastegate sounds!
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richardR1
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| posted on 13/12/10 at 11:19 PM |
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Would definitely say you need the pipes feeding back into the exhaust for IVA as others have said. Have just bought a highly tuned Skyline which has
external wastegates and screamer pipes and it sounds awesome but i think an IVA inspector would have heart failure 
MK Owners Club Member 1015
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CNHSS1
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| posted on 14/12/10 at 09:34 AM |
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with a decent ext WG, it should never open when the engines running unless it hits the boost threshold, so it becomes just a redundant tube. Depends
how alert the IVA guy is i guess
"Racing is life, everything else, before or after, is just waiting"---Steve McQueen
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coyoteboy
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| posted on 14/12/10 at 10:24 AM |
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quote:
ith a decent ext WG, it should never open when the engines running unless it hits the boost threshold, so it becomes just a redundant tube.
Depends how alert the IVA guy is i guess
Unless you have a good boost controller which actually blocks the pressure signal before the actuator, any WG will begin to open before the threshold,
at least from my experience. Significant early boost gains can be had by fitting a blocking boost controller which holds the WG shut until the crack
pressure, then ramming it open as much as needed.
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CNHSS1
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| posted on 14/12/10 at 10:58 AM |
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i was assuming a boost controller would be used. in my experience, the cheap ext WGs work OK in terms of conrolling boost, but often
'chuff' at idle which sounds pants (and could upset your IVA guy or a scrutineer...). The beauty of an ext WG design over a std internal
penny and actuator, is that pressure is fed to both sides of the gate, so that its sucked open and pushed shut if that makes sense.
"Racing is life, everything else, before or after, is just waiting"---Steve McQueen
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coyoteboy
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| posted on 14/12/10 at 11:11 AM |
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quote:
The beauty of an ext WG design over a std internal penny and actuator, is that pressure is fed to both sides of the gate, so that its sucked
open and pushed shut if that makes sense.
Fair point, even if it has an amusing mental image 
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CNHSS1
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| posted on 14/12/10 at 11:13 AM |
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Oooh errr Missus, fnaar, fnaar, nudge, nudge, wink, wink
"Racing is life, everything else, before or after, is just waiting"---Steve McQueen
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