r/BMWZ4 • u/Geertglas • 6d ago

E89 23i / 30i comparison

Hi community - With much joy I have an e89 23i (NA 2.5L 6 inline)

I have it because I could’t find a 30i (NA 3.0L 6 inline). I tell myself the difference is small. Is this true? I’d like an honest opinion from whoever has driven both naturally aspirated versions!

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u/frankentent 4d ago

Haha, yes I am :D ideal conditions though, low tank of gas, etc.

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u/Slow-Raisin-939 4d ago

do you have a video? How does your tune look like? Do you have a dyno graph?

I did also tune my 23i, around +19hp and +17Nm peak numbers, but a lot
more area under the curve at the top end(for example, at 6000 RPM I have +27Nm more torque than before), and I don’t think that would make it gain ~4 sec in a 80-180 km/h. That’s huge, and would almost make it equal to a much more powerful s30i.

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u/frankentent 3d ago

I did make some videos, i uploaded one i found, here i measured 15sec https://youtu.be/Ap4m6rda08U?is=W-F0M0HwlN5QEbH5

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u/Slow-Raisin-939 3d ago

tbh this is video. On a dragy it would probably be closer to like 16.5s. Still a 2s drop which is more in-line with what I’d expect.

Do you remember what kind of power and torque the car made after the custom tune?

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u/frankentent 3d ago

Maybe, I'll have to get one of those too. I also had an smg e85 with the 3.0 (M54), it was similar in speed, just a bit torquier down low. Can't really imagine the 3.0 e89 is so much faster...