s4 turbo housings in an s4 NA...
03-17-06, 01:52 PM
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s4 turbo housings in an s4 NA...
has anyone ever tried this? Is it possible? Is it a bad idea? The guy rebuilding my engine wants to do it, but I want a second opinion. (I searched, btw, and found nothing)
03-17-06, 03:10 PM
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they will fit fine but i advise not to cuz the turbo housings has holes on the side of the housings to feed coolant to the turbo. unless of course you block the passage.
03-17-06, 03:18 PM
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I'll assume he'll do that since he said it wouldn't void the warranty. What about timing? I know some housings have the sparkplug holes in different spots to advance or retard timing. And isn't the exhaust port totally different on the turbo? how will these effect my NA engine?
03-17-06, 03:26 PM
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TII and NA housings have the same spark plug placement.
The only real difference between the two are the coolant ports and the exhaust diffusers. There's no real reason to use TII housings in an NA since you can just grind the exhaust diffusers out (though there is some debate as to whether this makes any difference besides noise).
The only real difference between the two are the coolant ports and the exhaust diffusers. There's no real reason to use TII housings in an NA since you can just grind the exhaust diffusers out (though there is some debate as to whether this makes any difference besides noise).
03-17-06, 03:29 PM
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the spark plug holes are the same in turbo and n/a as long as it's for the same model. (swapping fd housing onto a fc engine will affect timing) if he says it doesnt void the warranty then i guess go for it. also since you're not boosting your n/a your timing will be the same as it was before the swap.
*edit* aaron beat me to it.
*edit* aaron beat me to it.
Last edited by TitosToy; 03-17-06 at 03:33 PM.
03-17-06, 03:30 PM
#6
unless they are Jspec housings, S4 Aspec rotor housings all have the same spark plug timing, S5/S6 Aspec and S4 Jspec housings all have a slightly earlier leading plug timing as well the S5/S6 has a knock sensor boss in the side of the housings. housings are directionally stamped "F" and "R" for front and rear for EGR passage placement.
the coolant passages can be blocked easily so that should not be an issue.
the coolant passages can be blocked easily so that should not be an issue.
Last edited by RotaryEvolution; 03-17-06 at 03:32 PM.
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