E46 330d rumble on acceleration

[Murphy24]

I’ve recently after remapping my 330d started to experience a rumble sound (like you would have on a rough road surface) on acceleration within the torque bands but only in 3,4,5,6. 

 

I’ve had a specialist bmw garage look over it and the only thing they could suggest was the rear diff, however that alone they said doesn’t have enough play to suggest. 

All bushes look good ie the rear mount mounts, the sub frame looks good, drive shafts are looking good, cv joint has a little play but not enough to suggest a problem. The rumble feels like it’s coming from the rear.

 

any ideas? 

[rasa]

it aint been mapped properly,,my e9 330d 305 bhp and 510ftlbs 698nm has a bit of rumble,,and the guy who has just remapped my other car(335d) is going to read the map and put it right..ie jason from bwchiptune,,the map on the 330d was done by durham remaps and i guess they just throw as much as they can at it and dont bother testing it on dyno like jason,,because he says its easy fixable,,he fixes loads of other tuners maps,,he may be a sponsor on here,,

Edited October 20, 2018 by rasa

[Murphy24]

Hi Rasa,

Thanks for responding, they guy who remapped it has done quite a few different cars for friends I know, including my brothers E39 and no problems. Also the rumble only came on after driving for a while and then really booting it, hence why I think its mechanical.

The remap has gone from 302 to 422 of torque FYI.

 

Any other ideas?

[Willse46]

Hi mate

Your rumble will either be your dual mass flywheel or your rear axles having too much torque going through them at lower rpms. Best to feed in the power until above 3000 rpm when in higher gears before giving full throttle. 

If you continue booting it at the same rate something will go bang so best to feed in the power until at safe rpms.

ideally a rolling road tune would help set safe limits in the mapping but if you’re sticking with your current map I would advise the above  

 

[rasa]

On 21/10/2018 at 18:42, Murphy24 said:

Hi Rasa,

Thanks for responding, they guy who remapped it has done quite a few different cars for friends I know, including my brothers E39 and no problems. Also the rumble only came on after driving for a while and then really booting it, hence why I think its mechanical.

The remap has gone from 302 to 422 of torque FYI.

 

Any other ideas?

i jhad 420 ftlbs in my e46..power delivery was great,,no rumble evr,,except when the centre bearing went,,but youd know if that went as the gearstick would shake and the car would only do around 20-30 mph before it would start shaking itself to death,,im 90% sure its the map as ive said,,some folk think they can map cars,,and they can,,but properly.. no..they might get away with getting it right a few times,,,please contact jason from bw chiptune as ive said,,honestly he knows it all,,tuning bmw cars since the 90,s,,and still doing so and also correcting other tuners maps,who have good reputations on facebook etc,,