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      02-13-2020, 02:50 PM   #1
Belgian_Bimmer
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Thumbs up B58 M40i Engine Tuning

I've been hesitating and finally decided to remap (ECU) my Z4 M40i B58 engine.

Measurements on Dyno:
- stock: 353 HP / 577 Nm ( vs EU spec: 340 HP / 500 Nm) => engine delivers more power than BMW's official figures.
- stage 1: 410 HP / 630 Nm

First impressions:
The car has gained a lot of agility, especially in the lower REV's.
On dry roads it delivers real super-car performance. However on wet roads it can barely handle the engine's power in first and second gear.
Fuel consumption has certainly decreased but actually I can't tell to what extend.
Because the gear shifts are a little more 'brutal' I'm considering a software remap of the transmission in the near future.

Conclusion:
If you consider a sportier and more agile drive, i certainly advise a stage 1 remap.

Last edited by Belgian_Bimmer; 02-18-2020 at 02:07 PM..
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Joe2402401.50

      02-17-2020, 01:46 AM   #2
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Quote:
Originally Posted by Belgian_Bimmer View Post
I've been hesitating and finally decided to remap (ECU) my Z4 M40i B58 engine.

Measurements on Dyno:
- stock: 353 HP / 577 Nm ( vs EU spec: 340 HP / 500 Nm) => engine delivers more power than BMW's official figures.
- stage 1: 410 HP / 630 Nm

First impressions:
The car has gained a lot of agility, especially in the lower REV's.
On dry roads it delivers real super-car performance. However on wet roads it can barely handle the engine's power in first and second gear.
Fuel consumption has certainly decreased but actually I can't tell to what extend.
Because the gear shifts are a little more 'brutal' I'm considering a software remap of the transmission in the near future.

Conclusion:
If you consider a sportier and more agile drive, i certainly advise a stage 1 remap.
Very nice.

I found a complete solution in here (especially you are in Europe)
https://www.daehler.com/produkte/bmw...z4/z4-g29.html
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      02-17-2020, 02:55 PM   #3
Belgian_Bimmer
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Other complete solution: https://www.ac-schnitzer.de/en/bmw/z...-roadster.html

Car keeps BMW warranty with AC Schnitzer parts, which is not the case with most other tuners.
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ToysArs40.50

      02-29-2020, 09:13 AM   #4
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Has anyone here tried the JB4 on the European model?
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