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Porting S5 turbo manifold..benefits/drawbacks

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Old 10-29-02, 05:48 AM
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Porting S5 turbo manifold..benefits/drawbacks

What would be the benefits and/or drawbacks of opening up the ports up on a stock S5 turbo manifold and turbo?

Thanks
Mike
Old 10-29-02, 07:59 AM
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I don't know if you'd really gain anything. I smoothed out my manifold back in the day, but I don't think it did anything special.

Porting the wastegate does make a big difference, though.

Dale
Old 10-29-02, 08:10 AM
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Hey dale, do you have any idea around how low I could keep boost if I ported my S4 wastegate as much as possible? (sorry to hijack your thread turboGXL )
Old 10-29-02, 09:00 AM
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its lowest boost level is decided by the spring in the wastegate actuator.
Old 10-29-02, 09:48 PM
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Well, I did open the ports some on my manifold.
I noticed more lag than before, but it seemed to have more high end too...

I was just trying to figure if this was imagined or not...
Old 10-29-02, 10:31 PM
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it's funny because extrude honing, will give you about as much as a cat-back. and yet people are so reluctant to go for it. It really depends on your mods, and obciously the higher ther HP the less effect it will have.
Old 10-30-02, 12:51 AM
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yea, after porting mine i did notice a little bit more power, but not a ton.

-Chris
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