Well, time to summarize my recent little mod which was TB swap. Potential benefits - obviously bigger TB, better air flow etc.
Here some tips and hints.
1. Choosing TB
For owners of auto pfl VR4 with TCL feature it seems that the most easiest option is to use Galant V6 n/a TB equipped with TCL. Usually this vehicles came out with "cruise control" feature as well, so important thing is not to mistake vacuum canisters. Galant n/a tcl vacuum canister is located on other side of TB!
2. Pairing with intake plenum.
Intake diameter of plenum manifold. No chance, but it must be machined out, bored out etc. Whatever method we choose. Just be aware that unlike in VR4 hole is not positioned symmetrically so better buy any TB gasket from Galant v6 and use for drawing template.
3. Cooling.
Apparently water inlets and outlets are positioned differently. There is no problem, but involves much more effort to fit water cooling hoses. Just getting advice from gowf and psbarham we can pass by cooling TB due to our mild environment and having turbo application. I did pass by and works it's treat.
4. Not used vacuum lines
That means cruse control canister and one of 3 vacuum outlets. Just do blank them. I did connect vacuum canister with 3rd vacuum outlet on a top of TB. Works.
How does it works?
Faultless. Possible gains or losses not verified yet. Haven't been to dyno, but my a**s telling me there is some improvement in torque. AFR figures got richer on cold idle, afr dropped on WOT at 0.9 bar from 11.3 to 10.5, so there is massive area to play with.
Few pictures:
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