[Dirk Diggler]

I recently picked up a new-to-me 2012 335i with the 8 speed auto.

The auto trans is the best I've ever felt, and blows away the GM 6L45 my e90 328i had.

I had a question for you guys. I notice when accelerating moderately from a stand still, this trans seems to reduce power between shifts, noticeably. I'm assuming this is done to extend the life of the clutches in the trans?

I drove a 2018 330i which I assume has the same trans, however I did not notice this reduction in power during shifts, it was more a smooth constant power delivery, with greater clutch slip. It felt more like a traditional trans. Did anyone else notice this minor variation in shift calibration? Perhaps it's a 4cyl vs 6cyl shift calibration, due to torque differences??

[Aatish]

Originally Posted by Dirk Diggler

I recently picked up a new-to-me 2012 335i with the 8 speed auto.

The auto trans is the best I've ever felt, and blows away the GM 6L45 my e90 328i had.

I had a question for you guys. I notice when accelerating moderately from a stand still, this trans seems to reduce power between shifts, noticeably. I'm assuming this is done to extend the life of the clutches in the trans?

I drove a 2018 330i which I assume has the same trans, however I did not notice this reduction in power during shifts, it was more a smooth constant power delivery, with greater clutch slip. It felt more like a traditional trans. Did anyone else notice this minor variation in shift calibration? Perhaps it's a 4cyl vs 6cyl shift calibration, due to torque differences??

Your transmission is a ZF-8. The LCI cars (2017+ I think) use a slightly different 8-speed. My sisters got a 440i; didn't really feel that much different than mine when i was driving normally. I like the ZF-8 tho, cuz of its strength.

What mode was this in? Not sure what you mean by that feeling, but I sometimes feel I bit of a "limit" effect when in comfort, but not really in sport+.

I remember when working on my current map, the TCU was suspected to be limiting my boost levels in third gear.

[Dirk Diggler]

Originally Posted by Aatish

Your transmission is a ZF-8. The LCI cars (2017+ I think) use a Chinese sourced 8-speed. My sisters got a 440i; didn't really feel that much different than mine when i was driving normally. I like the ZF-8 tho, cuz of its strength.

What mode was this in? Not sure what you mean by that feeling, but I sometimes feel I bit of a "limit" effect when in comfort, but not really in sport+.

I remember when working on my current map, the TCU was suspected to be limiting my boost levels in third gear.

Chinese transmission???

I thought pre-lci has the 8HP45, and some of the lci's have 8HP50, both from ZF.

I never said the shifting characteristics of my car were a problem, I just noticed they were definitely different from the 2018 328i I drove.

[Aatish]

Originally Posted by Dirk Diggler

Chinese transmission???

I thought pre-lci has the 8HP45, and some of the lci's have 8HP50, both from ZF.

I never said the shifting characteristics of my car were a problem, I just noticed they were definitely different from the 2018 328i I drove.

Could've sworn that with the LCIs, the transmission was changed. From what I read, it was a Chinese source or something...can't find the article, but I'll look around. Until then, let me change my post to keep things in order lol.

Yea, it'll feel a bit different lol.