N54 335i steptronic automatic problems

walkerE90 · 04-05-2016, 02:48 PM

I have put my details for my N54 in REAL OEM to check what transmission I have and it comes up with GA6HP19Z which I have read only has maximum torque rating of 400nm, I'm unsure where they take that value from. I'm running jb4 with DP and DCI map1 and when on full throttle 4th to 5th it's like the torque converter is slipping I also pulled code P0015 cam shaft B over retarded. Surely with mods I have it will be making more than 400nm and possible putting stress on gearbox.

Any ideas ?

mob17 · 04-09-2016, 02:02 AM

I'm pretty sure the ZF torque limits are conservative. As long as you don't brake boost and launch it all the time you should be fine. Tranny oil changes every 50k is a must.

My gearbox is rated at 600nm or 700nm, and i'm running 835nm for a year/12k with no issues touch wood.

04-05-2016, 02:48 PM	#1
walkerE90 Private 5 Rep 93 Posts Drives: E92 335i Hartge Join Date: Aug 2011 Location: SCOTLAND iTrader: (0)	N54 335i steptronic automatic problems I have put my details for my N54 in REAL OEM to check what transmission I have and it comes up with GA6HP19Z which I have read only has maximum torque rating of 400nm, I'm unsure where they take that value from. I'm running jb4 with DP and DCI map1 and when on full throttle 4th to 5th it's like the torque converter is slipping I also pulled code P0015 cam shaft B over retarded. Surely with mods I have it will be making more than 400nm and possible putting stress on gearbox. Any ideas ?
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04-09-2016, 02:02 AM	#2
mob17 Major General 400 Rep 5,623 Posts Drives: E92 335D Join Date: Mar 2012 Location: East Midlands, UK iTrader: (5)	I'm pretty sure the ZF torque limits are conservative. As long as you don't brake boost and launch it all the time you should be fine. Tranny oil changes every 50k is a must. My gearbox is rated at 600nm or 700nm, and i'm running 835nm for a year/12k with no issues touch wood.
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