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Originally Posted by rotarymike
Is the S5 like the S4, in that the boost sensor is a different range for the NA and T2? Also, I may have a proper S5 boost sensor (N370?) in my spares bin.
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All non-turbo FC pressure sensors are 1-bar type = -15psi (well, vacuum) to 0 ATM.
All turbo FC boost sensors are 2-bar type = -15psi to +15psi.
So all the turbo FC boost sensors are calibrated the same.
Unfortunately, non-turbo FC versus turbo FC are caibrated differently.
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The 2-wire plug is a totally different shape. Big oval instead of T-shape.
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Oops, sorry about that.
We all run FD alternators (who runs S4 alternators these days?
) which have the same plug as the S5 alternators do.
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replacing the S4 harness with a decent S5 engine harness, so it should all plug in. I'm not worried about boost, I actually use a NA cluster and separate boost gauge. I remember getting the S4 turbo to work in the S4 convertible chassis took some rewiring - the 'vert chassis was an Auto so some wires were absent or in other places. I think I had to rewire the alternator completely (sense wires, not power wire). But the S5 harness I'm trading for is completely stock and looks mostly good.
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Side note, you can use a non-turbo S5 wiring harness to make this work (with the S5 engine).
There are a couple differences - VDI, 6-port versus boost control - but almost all of the other pins are the same.
It'll all plug into an N370 - S5 turbo FC - stock ECU.
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So I need an S5 lower oil return pipe to use the S5 front cover. I can't remember off the top of my head what pipes I had laying around when I put the S5 turbo on, but everything fit more or less without too much 'splaining.
If necessary, I can make that from scratch if I have to.
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I'm pretty sure the only difference was that intermediate pipe.
Double check the flanges - the S5 uses an offset flange at one point I think.
-Ted