[Rocket M3]

Has anyone on here ever had a 320si remapped on a rolling road, and if yes, with what performance gains?

[caliban413]

Had mine done last month. 0% performance gain... The car would revert to its basemap every time the tuner went near the ignition timing.

I have had contact with a guy who ended up with 210hp but that took a new intake, schrick sport cams, a custom exhaust manifold with cat delete. All mods that cost big money. I have asked around a lot but the message is always the same - forget it. If you want more hp get a 335i it will be less expensive.

I still love my SI though I had hoped for some more power.

[Jan E.]

Do You know what intake he has?

Im looking for something to replace what look like a restrictive original.
And do you know how the car performes with the mods? Less torque in the low range, so have to rev it more maybe?

[Digitalize]

Don't bother remapping an NA car unless you've done mods that mean it no longer runs well.

[ade146]

Originally Posted by Digitalize

Don't bother remapping an NA car unless you've done mods that mean it no longer runs well.

A very sensible post

[Jan E.]

Especially in this tread

320si is notorious for not having the optimal stoichiometric mixture. So a 320si are one of the few NA cars I would recommend to check if a MAP is useful

Usually it's enough to get a software upgrade from the dealership. But in some cases that is not enough.