[TonyG]

beepbeep

On my 3.6L with the TWM 3003's ITBs using a TEC3r, the signal that is produced via the built in vacuum ports (one on each throttle body) is enough to run straight MAP (with no TPS blend function) and perfect streeet drivability and perfect a/f mapping.

It's also enough, w/o a vacuum resovior, to run my power brakes with no problems thus far.

While I don't have any experience with turbo charged 911's with respect to using ITB vs common plenumn, I do have that experience with 944 turbos. And with the 944 turbos, the ITB's have a clear advantage with throttle response, which translates into more exhaust gas, which gets the turbine spinning sooner. The difference is quite large actually (on these cars). And even if it works good on my 911, I don't have a direct before-and-after comparision on the 911 setup like I do on the 944 turbo setup. One would think the results would be similar though.

I went to the TWM ITB's for my 3.6 and took off the PMO's so that I can turbo charge it. And while it my be somewhat expensive for the throttle bodies, it's not that bad if you don't have an intake to begin with that can be used for boosted applications and have to start from scratch (as in my case). I think the TWM 3003's, TPS sensor, fuel rails, fuel pressure regulator, and PMO manifolds were about $2000. Compare that to buying a 3.2 manifold, throttle body, TPS, fuel rails, adapters to use a 3.2 manifold on a 3.6, etc... and the cost difference is not that bad.

Besides... having the TWM's will allow a very simple split intercooler setup that will package nicely in the limited space :-)

mu ha ha


TonyG