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Nanometer Nanometer is offline
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Default 06-26-2018, 04:52 PM

hm, maybe someone will chime in with something.. I used the Alpina flash and XHP 3, both have the same problem. Such a weird symptom...


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BMW135xi BMW135xi is offline
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Default 06-26-2018, 05:54 PM

Get some clutches from PD , upgrade the valvebody with Sonnax kit , put an oil cooler tranny from Setrab, and change oil with Pentozin AF1.
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Nanometer Nanometer is offline
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Default 06-27-2018, 09:36 AM

Clutches, maybe. But we don't have satisfying evidence to say that it is specifically the clutches.
Um, no, it does not need the sonnax kit, As I mentioned earlier, I have replaced all the gaskets, and I have replaced all of the solenoids, which made no difference to the performance.
Our cars already a tranny cooler, but I agree they would benefit from a cooler running system. This could already be done if you ran a colder thermostat since the coolant cools the tranny via a heat exchanger. If the failure is mechanical, then the damage is done and a cooler tranny likely wont help. I have read numerous amounts of people changing their fluid with various varieties. I have not seen one of those circumstances fix slipping issues once the car is already in gear.
A likely cause is bushing that is leaking fluid and there just isnt enough pressure to hold the clutch plates together. If the clutches were worn, then I would not expect them to be worn in gears 5 and 6 where those typically see the least wear.


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Default 06-27-2018, 09:44 AM

Than probably worn bushings..
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Nanometer Nanometer is offline
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Default 06-27-2018, 09:49 AM

probably... gotta pull tranny for that... I'll just live with the issue


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BMW135xi BMW135xi is offline
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Default 06-27-2018, 10:16 AM

Well , don'y worry this is my third tranny. I buy them in ebay with low mileage for anywhere from $800 to $1,500. Good luck..
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Default 06-27-2018, 10:54 AM

Quote:
Originally Posted by BMW135xi
Well , don'y worry this is my third tranny. I buy them in ebay with low mileage for anywhere from $800 to $1,500. Good luck..
Damn man! How you blow so many?


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Default 06-27-2018, 11:06 AM

Keeping the boost to high with pure stage#2 ..
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Default 06-27-2018, 11:33 AM

Quote:
Originally Posted by BMW135xi
Keeping the boost to high with pure stage#2 ..
At least you're having fun!


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It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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Default 06-27-2018, 11:38 AM

yep, love the spool at 24 psi and 28 psi .
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seroga1986 seroga1986 is offline
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Default 06-28-2018, 08:06 AM

I have logged over 80 on track hours all on 20psi. Thousands of street pulls, drag racing and shenanigans on 23-25psi. Trans is working great, no hickups. I have bypassed the heat exchanger and did my own trans cooler set up with a 160 thermostat. Barely see temps over 170 even on track with 20 min sessions.


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dh58 dh58 is offline
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Default 12-08-2018, 08:16 PM

Did you ever get this resolved?

I am now having the exact same issue.. on the same BB E85 flash..
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Carlos Carlos is offline
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Talking Trans - 12-10-2018, 09:14 AM

I haven't had this problem yet with my AT, but if time to replace the transmission...., are there any other options aside of a stock new, stock rebuild, or a stock used transmission?
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Turbohugh Turbohugh is offline
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Default 04-28-2019, 09:38 PM

I'm having the same issue. I think it's the bushing, from youtube and everything else I'm reading this bushing, once worn permits excessive fluid to bypass and that decreases the clamping pressure available to keep the E clutch pack together. This can be temporarily fixed with higher viscosity fluids however it wont be fixed without new bushing and other mechanical part replacements = $$$$$ !
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robertsawh82 robertsawh82 is offline
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Default 10-05-2019, 11:54 PM

I have the same problem with my transmission coming out of gear and sticking in first also, not allowing me to shift.


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mafia321 mafia321 is offline
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Default 10-08-2019, 04:09 PM

oil temp trans? activate cold fan menu 6 options 1
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Default 10-09-2019, 09:19 AM

Quote:
Originally Posted by Carlos
I haven't had this problem yet with my AT, but if time to replace the transmission...., are there any other options aside of a stock new, stock rebuild, or a stock used transmission?
+1. Also curious. I'm on my second A/T and when my love of brake boosting, I'm wondering about a potential 3rd A/T. Still working, but our line of Transmissions had a few that were rated higher. Wondering if anyone swapped one of them in. (ZF 6HP --> ZF 8HP)




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robertsawh82 robertsawh82 is offline
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Default 10-09-2019, 01:30 PM

I emailed xhp and they told me it's not a software issue and it's a problem with the hardware. I recently purchased this transmission about two years ago from BMW. So it's a brand new transmission. Not sure of the transmission temperature when it happens. I'll check when it happens again


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Turbohugh Turbohugh is offline
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Default 10-15-2019, 11:53 AM

Quote:
Originally Posted by robertsawh82
I emailed xhp and they told me it's not a software issue and it's a problem with the hardware. I recently purchased this transmission about two years ago from BMW. So it's a brand new transmission. Not sure of the transmission temperature when it happens. I'll check when it happens again
can you get MHD and datalog the temps ?
What adaptations and fault codes are in your trans? Can you screen shot the XHP report?
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Default 10-15-2019, 01:27 PM

Quote:
Originally Posted by robertsawh82
I emailed xhp and they told me it's not a software issue and it's a problem with the hardware. I recently purchased this transmission about two years ago from BMW. So it's a brand new transmission. Not sure of the transmission temperature when it happens. I'll check when it happens again
Order our BMS trans cooler and get the XHP flash

https://burgertuning.com/products/bm...cf786bbd&_ss=r


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msport335 msport335 is offline
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Default 10-25-2019, 12:27 PM

same issue here all season long... N54, PS2, Meth and XHP stage 3.

car will not even hold a 3rd gear pull all the way to redline as it pops itself out of gear and is stuck in 5th. will not downshift automatically when coming to a stop either. i have to manually downshift to 1st or 2nd when moving from a stop after a hard pull.

never had trans serviced and it now has 140k KMS ....unsure whether a service would do it or if i need to upgrade the clutches.

I daily it with just north of 600whp and max it hit on dyno was 670whp
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CastleBravo CastleBravo is offline
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Default 11-07-2019, 09:13 PM

Quote:
Originally Posted by msport335
same issue here all season long... N54, PS2, Meth and XHP stage 3.

car will not even hold a 3rd gear pull all the way to redline as it pops itself out of gear and is stuck in 5th. will not downshift automatically when coming to a stop either. i have to manually downshift to 1st or 2nd when moving from a stop after a hard pull.

never had trans serviced and it now has 140k KMS ....unsure whether a service would do it or if i need to upgrade the clutches.

I daily it with just north of 600whp and max it hit on dyno was 670whp


I replaced the clutches (and a broken reverse drum) on my 5 HP 19 from my old 330i a few years back. Despite the odd quality issue ZF make great transmissions and they are very diy serviceable if you do your research.

Now the thing is under 'normal use' these clutch packs don't really wear as they are immersed in fluids. My unit had 130k miles on it and didn't really need to replace the clutches according to a AT rebuilder I consulted. As I'd gone to the effort of getting into the thing to replace the broken drum.

High torque and or high fluid temperatures could likely cause wear, however in 'normal use' it seems that the clutch packs wearing out is not the typical cause of failures.

The other cause of course can be in the valve body. I stayed out of the valve body so cannot comment on issues there, however I do know the valve body solenoids are easily replaced.
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