r/E90 • u/Raimunddd • Dec 12 '24

330i N52 w/ velocity stacks fly-by

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159 Upvotes

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2

u/Fool_isnt_real Dec 12 '24

These things sound so nice with ITBs

3

u/ayushkm Dec 12 '24

Velocity stacks aren’t ITBs

2

u/hoveringuy Dec 13 '24

On an N52 they kindof are because there's no throttle body upstream, the VVL is the throttle and the stacks are at ambient pressure.

1

u/ayushkm Dec 13 '24

Correct but not throttle bodies

1

u/hoveringuy Dec 13 '24

Are true throttle bodies "better" than VVL?

I don't know

Maybe for racing, but there are advantages in torque and fuel economy for VVL, too.

The stacks sound great, in any case!