06-19-2019, 12:35 PM | #1 |
Private First Class
47
Rep 163
Posts |
Transmission Strength
Have you guys heard of any issues with transmission strength? The ZF8HP50 is only rated for 500NM of torque, but pretty much everyone with tunes is running quite a bit more than that. Is that just a conservative estimate or is there a risk of longevity? I obviously know running more power hurts longevity, but I am wondering to what degree.
|
06-19-2019, 01:25 PM | #2 | |
Lieutenant
187
Rep 458
Posts |
Quote:
|
|
Appreciate
0
|
06-20-2019, 09:33 AM | #3 |
Second Lieutenant
130
Rep 274
Posts |
I agree, seems like manual guys are having more transmission trouble than auto right now. Obviously a manual is easier to upgrade but if you aren't turbo swapping you should be fine.
|
Appreciate
0
|
06-25-2019, 11:09 PM | #4 | |
Private First Class
49
Rep 133
Posts |
Quote:
edit yup your right 8hp50 https://www.bimmerforums.com/forum/s...ted-with-a-m70 Last edited by seansurfn2; 06-25-2019 at 11:24 PM.. |
|
Appreciate
0
|
06-26-2019, 12:39 PM | #5 |
Mile High Member
6
Rep 109
Posts |
Here's a good article to read: https://www.xhpflashtool.com/blog/li...engine_torque/
__________________
I believe in Karma. That means I can do bad things to you all day long and assume you deserve it
|
Appreciate
0
|
06-26-2019, 05:04 PM | #6 | |
Private First Class
47
Rep 163
Posts |
Quote:
|
|
Appreciate
0
|
06-26-2019, 05:25 PM | #7 |
Mile High Member
6
Rep 109
Posts |
No, I don't believe so but that's a question for your tuner. While I do think the MHD can make adjustments to the torque limit table in the ECU it does nothing to program the TCU or adjust the line pressure and shift timing etc.
__________________
I believe in Karma. That means I can do bad things to you all day long and assume you deserve it
|
Appreciate
0
|
06-26-2019, 07:10 PM | #9 |
Lieutenant
187
Rep 458
Posts |
Lol the link that you posted- xHP. Its the only legitimate TCU flash on the market. Even Bootmod3 came out with a transmission flash but all it does is remove the torque limiters in 3rd and 6th gear. It doesn't give you any of the other improvements or benefits that xHP will.
|
Appreciate
0
|
06-26-2019, 08:03 PM | #10 |
Private First Class
41
Rep 119
Posts |
__________________
2017 BMW M240i xDrive - Mission Performance Stage 2 and transmission flash, CSF Intercooler, VRSF 4.5" downpipe, Dinan midpipe, BMW M Performance muffler, Agency Power Cold Air Intake. 11.58 @ 116MPH
|
Appreciate
1
nikman011174.50 |
06-27-2019, 12:32 PM | #11 | |
Captain
605
Rep 970
Posts |
Quote:
I'm guessing as long as you don't constantly "flog" the car and use launch control as a normal, the transmission should be beefy enough to hold up with most of the tunes being sold. I would certainly be concerned if I was spending weekends at the local drag strip and pushing the car to its limits as my entertainment outlet. |
|
Appreciate
0
|
06-30-2019, 09:22 AM | #12 | |
Second Lieutenant
171
Rep 294
Posts
Drives: 2019 M240i Coupe RWD
Join Date: Feb 2019
Location: New England
|
Quote:
#1: Why would middle of the range (4th for the 6 speed, 3rd and 6th for the 8 speed) have lower torque limits and lower line pressure? That doesn't seem to make sense? Maybe a gradual decrease in limits as you go up the gears would make more sense? I would be surprised if BMW and ZF just randomly tuned the transmission that way. #2: What are the effects of messing with line pressure? If 1st gear has the highest line pressure when stock and the tune just brings other gears up to that level, then that's probably not a big deal reliability wise. But even for that case there must be a reasons for wanting to run lower line pressure. Is it for comfort of shifts? Is it for longevity of the transmission in some way? And does the xHP trans tune push the line pressure limits to higher than stock (1st gear)? That would be a reliability red flag if that were the case... |
|
Appreciate
0
|
09-24-2019, 02:28 PM | #14 | |
Banned
3
Rep 76
Posts |
Quote:
Last edited by MAILIYAT; 09-24-2019 at 03:31 PM.. |
|
Appreciate
0
|
10-08-2019, 06:45 PM | #15 |
Private
20
Rep 60
Posts |
I'm sticking with a Stage 1 91 octane Bootmod tune (even though I live in the land of 93 octane). Why? Because I don't trust the 8AT to be able to handle much over stock torque. It would be awesome to make more power and get a transmission tune so the shifts are crisper, but it's just asking for trouble.
Maybe in a couple of years if ppl with Stage 2+ tunes are not grenading their 8ATs, then I'll jump in. |
Appreciate
0
|
10-08-2019, 08:37 PM | #16 | |
Lieutenant
425
Rep 435
Posts |
Quote:
|
|
Appreciate
0
|
10-09-2019, 10:16 AM | #17 | |
Lieutenant
187
Rep 458
Posts |
Quote:
The ZF8 is absolutely underrated from the factory and thats for liability purposes. Better to say your transmission can handle only a certain amount and let the aftermarket find out that it can handle more rather than claiming your transmission can handle a lot and then when it doesn't, you have a class-action lawsuit.
__________________
2019 M240i M Performance Edition / xDrive / ZF8 / BM3 Stg 2+ E30 / xHP Stg 3 / Dorch Stg 2 HPFP / Evolution Racewerks Catless Downpipe / MPPSK Exhaust / FTP Drop in Filter / FTP Intake Pipe / FTP Chargepipe / NGK 94201 Spark Plugs .022 / Michelin PS4S - 225/35/19 + 245/30/19
|
|
Appreciate
0
|
10-09-2019, 08:42 PM | #18 | |
Private
20
Rep 60
Posts |
Quote:
|
|
Appreciate
0
|
10-09-2019, 08:44 PM | #19 |
Private
20
Rep 60
Posts |
This is the first car I've owned in 20 years with an AT, so I am a poor judge of shift crispness. They feel mushy to me, and WOT on the freeway is a crap shoot...the transmission makes worse choices than a teenager on crack, like upshifting to near the redline, where it's all noise and no power.
|
Appreciate
0
|
10-09-2019, 09:33 PM | #20 | |
Lieutenant
187
Rep 458
Posts |
Quote:
Also, car owners who are putting down big power aren't worried about their transmission going to 75-100k. What made me laugh about your initial comment was the fact that you think stg 2 93 is big power (it's not). Unless you are planning on running "high power", you should not be worrying about stg 2 93 grenanding your transmission or significantly reducing the life of the transmission.
__________________
2019 M240i M Performance Edition / xDrive / ZF8 / BM3 Stg 2+ E30 / xHP Stg 3 / Dorch Stg 2 HPFP / Evolution Racewerks Catless Downpipe / MPPSK Exhaust / FTP Drop in Filter / FTP Intake Pipe / FTP Chargepipe / NGK 94201 Spark Plugs .022 / Michelin PS4S - 225/35/19 + 245/30/19
|
|
Appreciate
0
|
10-10-2019, 09:52 AM | #21 | |
Second Lieutenant
171
Rep 294
Posts
Drives: 2019 M240i Coupe RWD
Join Date: Feb 2019
Location: New England
|
Quote:
That's why I've never even driven the car in auto mode once its warmed up. I drive manual 99% of the time because I know what gear I want to be in. I will agree that its very annoying that when you mash the throttle and hit downshift (not upshift like you said) that is selects a gear that puts you so close to redline. It's cool that is skip shifts, but what is the point of being so close to redline? You have to almost immediately upshift. |
|
Appreciate
0
|
10-10-2019, 11:30 AM | #22 |
Lieutenant
120
Rep 410
Posts |
The ZF is used worldwide and I'm sure some people running big TORQUE (aka diesel owners) in Europe did a lot of miles.
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|