Where to be in the rev range

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freshman111
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Where to be in the rev range

Post by freshman111 » Wed Sep 19, 2018 12:13 am

Hi everyone,

Had my M140i SE for a few weeks now. It’s got the ZF8 box.

Blistering fast and it brings a huge smile to my face, especially revving it out!

But this brings me to my question, when making haste is it better to rev right out to >~7000RPM in each gear or to change up at 6500RPM?

I only ask as it seems that high up in the rev range it seems to run out of puff and upon googling it appears that peak BHP is between 5000-6500RPM

Any advice greatly appreciated!

Thank you.


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garysan
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Re: Where to be in the rev range

Post by garysan » Wed Sep 19, 2018 1:11 am

The B58 in the M140i doesn't appreciate being revved out all the way like the previous N55 engine did (from the M135i) did/does. In my M135i I get the same sensation if I'm NOT in Sport+. Comfort and to a lesser degree, Sport does seem to run out of puff North of about 5k so make sure you're in Sport+ for the best experience of higher up the rev range but bear in mind what I've said above in comparing the two engines.
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NISFAN
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Re: Where to be in the rev range

Post by NISFAN » Wed Sep 19, 2018 2:12 am

Maximum acceleration is achieved by changing around 6700-6900 depending on gear. 7000 in first.


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NISFAN
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Re: Where to be in the rev range

Post by NISFAN » Wed Sep 19, 2018 2:15 am

garysan wrote:The B58 in the M140i doesn't appreciate being revved out all the way like the previous N55 engine did (from the M135i) did/does. In my M135i I get the same sensation if I'm NOT in Sport+. Comfort and to a lesser degree, Sport does seem to run out of puff North of about 5k so make sure you're in Sport+ for the best experience of higher up the rev range but bear in mind what I've said above in comparing the two engines.
You do realise that engine power and mapping is exactly the same in all modes, including eco? Not quite sure why you think there is a revving difference between them. Image


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GeeDee
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Re: Where to be in the rev range

Post by GeeDee » Wed Sep 19, 2018 7:38 am

Why don't you place the gearbox in sport mode and watch when it changes up as I would have thought ( :idea: ) the BMW engineers would programme everything to give you max acceleration or am I being too optimistic?

I think it's the torque curve you need to look at, not power as that only really affects potential top speed (I think :? )
NISFAN wrote:
Wed Sep 19, 2018 2:15 am
You do realise that engine power and mapping is exactly the same in all modes, including eco? Not quite sure why you think there is a revving difference between them. Image
But isn't gearbox "mapping" different for each mode?
Last edited by GeeDee on Wed Sep 19, 2018 3:41 pm, edited 1 time in total.
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dantheman
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Re: Where to be in the rev range

Post by dantheman » Wed Sep 19, 2018 9:16 am

GeeDee wrote:
Wed Sep 19, 2018 7:38 am
But isn't gearbox "mapping" different for each mode?
Not if you've pressed the accelerator all the way to kick-down.
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garysan
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Re: Where to be in the rev range

Post by garysan » Wed Sep 19, 2018 10:03 am

NISFAN wrote:
Wed Sep 19, 2018 2:15 am
garysan wrote:The B58 in the M140i doesn't appreciate being revved out all the way like the previous N55 engine did (from the M135i) did/does. In my M135i I get the same sensation if I'm NOT in Sport+. Comfort and to a lesser degree, Sport does seem to run out of puff North of about 5k so make sure you're in Sport+ for the best experience of higher up the rev range but bear in mind what I've said above in comparing the two engines.
You do realise that engine power and mapping is exactly the same in all modes, including eco? Not quite sure why you think there is a revving difference between them. Image


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Perhaps it's throttle mapping/sensitivity then but there's definitely a difference.
Current: 2016 M135i Alpine White, ProNav, Adaptive Suspension, Motech Eibach, TPI Spacers, F22 U/C Brace
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stevesurrey
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Re: Where to be in the rev range

Post by stevesurrey » Wed Sep 19, 2018 11:05 am

I hope the car got suitably run-in before redlining it so early in its life :)
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tweeky
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Re: Where to be in the rev range

Post by tweeky » Wed Sep 19, 2018 11:11 am

I hope the car got suitably run-in before redlining it so early in its life
exactly my thoughts.
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freshman111
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Re: Where to be in the rev range

Post by freshman111 » Wed Sep 19, 2018 3:28 pm

Thank you all for the suggestions. I did just as suggested as changing slightly earlier seems to work.

To be honest just leaving the gearbox in sport does a great job!

And yep, around 1500 miles in (been a busy few weeks!), and only a nicely warm engine :)

The exhaust burbles and pops bring so many smiles. It’s the simple things in life :D

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