[smass]

I recently went stage 1 MHD on my 2010 335i. Without the MHD I can do a WOT pull at 60, let off the gas quickly and everything is normal. On MHD stage 1, I get a thud/clunk when I let off the gas quickly. It is almost like something in the driveline is twisting under the torque and letting off once the torque goes away.

What is the most common cause for this? The motor mounts were changed a few years ago. Diff bushings are new but I used stock bushings rather than M3. Driveshaft guibo or bushing? Could the stock diverter valves cause this?

The car does have an 8 speed swap from a 2016 F30 w/ CANTCU. The dif is a 3.08 from a MT car. Other than that it is stock.

thanks

[TiAgAu]

Originally Posted by smass

I recently went stage 1 MHD on my 2010 335i. Without the MHD I can do a WOT pull at 60, let off the gas quickly and everything is normal. On MHD stage 1, I get a thud/clunk when I let off the gas quickly. It is almost like something in the driveline is twisting under the torque and letting off once the torque goes away.

What is the most common cause for this? The motor mounts were changed a few years ago. Diff bushings are new but I used stock bushings rather than M3. Driveshaft guibo or bushing? Could the stock diverter valves cause this?

The car does have an 8 speed swap from a 2016 F30 w/ CANTCU. The dif is a 3.08 from a MT car. Other than that it is stock.

thanks

V10 Maps i'm guessing? Check out the last 2 pages of "take a look at my log" thread

pages 274,275

[smass]

Originally Posted by TiAgAu

V10 Maps i'm guessing? Check out the last 2 pages of "take a look at my log" thread

pages 274,275

Thanks. I think that is what it is. I will try V9.

[vadonchez]

come back on this problem.

LastGray succeed to remove this throttle lift off massive jerk under high load by installing MHD V2.41 app version.

When i look at "what's new" section into MHD app I can see some interesting informations:

V3.03 "fixed issue with jerkiness when lifting throttle"
V3.09: "further improvement to throttle lift smoothness"

So it seem's that this problem exist for awhile and MHD team take it into account.

So why on MHD V3.20 version we still have it?

Should we try to reverse to V3.09 version and see if it help ?

MHD app version are available here :https://apkpure.com/mhd-flasher-n54/...r.n54/versions

We can see that some version are heavier than others and i don't know why so i'm afraid to try a wrong version....


I just sent an email @ken and MHD:

"Hi guys

On E90 forum we are some to experimente throttle massive jerk when letting off throttle under load.
This problem occurs only with V10 maps.
A member tried to come back to V2.41 app version and succeed to delete this jerk.

When i look at MHD "what's new" map I can read that you already took this problem into account in V3.03 and V3.09 app version.
So why is it still there with V3.20 version?

Can we try to come back to V3.09 version and see if it help?

I'm so happy with MHD+ but i have to use older map version to avoid this problem.

Would like to use V10 map with MHD multimap, did you have a solution wich can help N54 community?

Thanks a lot and have a nice day

Vincent"