340i MPPK torque vs M140i

[Billy_Whizzzz]

Interested that the 340i with the MPPK has less torque than the auto (i.e. When it's remapped it is given less torque) - presume this is to protect the gearbox. But the manual M140i has the same torque as the auto - both of which have more than the 340i. So, I'm wondering if a) I'm wrong and the torque in manual M140s is less than autos or b) whether the manual 340 has a different gearbox...

[Monty Python]

Figures I've seen for the 340i MPPK increases torque from 332 to 369 lb ft - that's not a reduction in my book. It looks to me like the MPPK simply remaps the engine in the 340i to the same state as in the M140i (albeit with a bit more power). After all, it's the same engine.

Edited by Monty Python on Wednesday 26th April 08:26

[Billy_Whizzzz]

Sorry my point was that the auto 340
Is remapped to 369 ft/lb whereas the manual remapped to 350 ft/lb when surely the gearbox can handle the same torque (369) as the 140?

[Monty Python]

Billy_Whizzzz said:

Sorry my point was that the auto 340
Is remapped to 369 ft/lb whereas the manual remapped to 350 ft/lb when surely the gearbox can handle the same torque (369) as the 140?

Not necessarily - manual gearboxes tend to have lower torque ratings, which is part of the reason why just about every high performance car now has some form of DSG/automatic gearbox. It allows a degree of control over how much torque is fed through the gearbox, something that can't really be done with a manual.

[Billy_Whizzzz]

I know that. But my question is: given that the 140 must have the same gearbox as the 340 (or am I wrong in thinking this) why can't the torque in the manual MPPK 340 be the same as the manual 140?

[Monty Python]

Billy_Whizzzz said:

I know that. But my question is: given that the 140 must have the same gearbox as the 340 (or am I wrong in thinking this) why can't the torque in the manual MPPK 340 be the same as the manual 140?

No idea - if you're that bothered, ask BMW.

[CarsOrBikes]

The 3 is a heavier car, so the gearbox will be the weakest link I would think, that's all, you'd quite possibly find it more tractable even with a few lbs less.

[Nogbadthebad]

That then would probably explain why I`m on my 3rd manual gearbox on my 2010 335i (110K) all under warranty luckily.

[the-sheep]

Billy_Whizzzz said:

I know that. But my question is: given that the 140 must have the same gearbox as the 340 (or am I wrong in thinking this) why can't the torque in the manual MPPK 340 be the same as the manual 140?

It is sometimes worth asking these questions, you may find it comes down to someone making a typo that never gets checked!

[helix402]

140 and 340 have different gearboxes.

[gizlaroc]

Monty Python said:

No idea - if you're that bothered, ask BMW.

Haha, surely this is point of forums.

[Billy_Whizzzz]

gizlaroc said:

Monty Python said:

No idea - if you're that bothered, ask BMW.

Haha, surely this is point of forums.

Exactly. And BMW haven't a clue.

[CarsOrBikes]

Maybe it's torque difference between cars plus additional weight of 3 series = increased load on transmission?

[Crackie]

Monty Python said:

Figures I've seen for the 340i MPPK increases torque from 332 to 369 lb ft - that's not a reduction in my book. It looks to me like the MPPK simply remaps the engine in the 340i to the same state as in the M140i (albeit with a bit more power). After all, it's the same engine.

They are both B58 engines but there's a good chance the version in the M140i/240i is making a fair bit more than rated power. https://en.wikipedia.org/wiki/BMW_B58

The HP version of the N55 used in the M135i/M235i made 40bhp more than the standard N55 used in the 335i. I read somewhere that the M135i/235i version has different cams, different exhaust and mapping to suit these.

http://www.superchips.co.uk/curves/N55%20with%20Re...

http://www.superchips.co.uk/curves/F21M235iEPC.pdf

Edited by Crackie on Tuesday 1st August 08:29

[Mike335i]

helix402 said:

140 and 340 have different gearboxes.

Realoem has them both a gs6 45bz.

[Wills2]

Crackie said:

They are both B58 engines but there's a good chance the version in the M140i/240i is making a fair bit more than rated power. https://en.wikipedia.org/wiki/BMW_B58

The HP version of the N55 used in the M135i/M235i made 40bhp more than the standard N55 used in the 335i. I read somewhere that the M135i/235i version has different cams, different exhaust and mapping to suit these.

http://www.superchips.co.uk/curves/N55%20with%20Re...

http://www.superchips.co.uk/curves/F21M235iEPC.pdf

Edited by Crackie on Tuesday 1st August 08:29

Ah yes that well known charity BMW AG, free additional power for everyone!