[Boostedphil698]

Originally Posted by KoenG

Any update on this story? I'am looking for a f30 340i (with 8HP50) and I see that stage 1 is already immediately 580Nm. So clearly beyond specification. Will it hold?

The trans will hold fine. xHP transmission flash should be flashed in order for the transmission to handle the higher torque.

[KoenG]

Originally Posted by 435i_Phil

The trans will hold fine. xHP transmission flash should be flashed in order for the transmission to handle the higher torque.

Do you happen to know what the transmission flash do in order to handle the torque? How can software reduce the mechanical load and higher temperature?

tx!

[Boostedphil698]

Originally Posted by KoenG

Do you happen to know what the transmission flash do in order to handle the torque? How can software reduce the mechanical load and higher temperature?

tx!

The flash increases line pressure and raises the torque figures so the transmissions can recognize that more torque is going to be applied. It also decreases shift times. If you are really concerned about hurting the transmissions, Pure Drivetrain Solutions can build you a ZF8HP50 that is rated for about 1000hp and 850tq. That package would cost 6k for the trans. I'd say, if your plans are to not exceed 550 wheel torque, you'll be fine most likely. I've seen people run in the 600s with no issues.

[bandook]

Originally Posted by harkes

Really that long? Nope, my car is at 97000km now and the gearbox is just fine

Just curious, do you still have the car and if so how is the trans holding? With xHP new drag mode I'm already trying to figure out what I'm gonna do if the trans pops. Drag mode is so rad, and now that I've tried it I can't live without it.

[Wires]

Originally Posted by bandook

Just curious, do you still have the car and if so how is the trans holding? With xHP new drag mode I'm already trying to figure out what I'm gonna do if the trans pops. Drag mode is so rad, and now that I've tried it I can't live without it.

Well... xHP's comments:
"Please note, that expected wear on clutch packs is around 4 times higher and transmissions in less than optimal working-state can develop mis-shifts! This is especially true for highly tuned vehicles already experiencing issues with clutch-slip! Software can’t exceed the limits of your hardware!"

I'd expect that you're going to find the transmission eventually grenading which is going to be super fun and expensive.

[harkes]

Originally Posted by bandook

Just curious, do you still have the car and if so how is the trans holding? With xHP new drag mode I'm already trying to figure out what I'm gonna do if the trans pops. Drag mode is so rad, and now that I've tried it I can't live without it.

Still own the car but only at 108000km now. Zero issues.

Think logically about this. How many percent of your shifts are "drag mode shifts"? 0.01%?? Alright, now those 0.01% shifts account for 0.04% of the wear............. See where I am going? And who says anything will pop? Hear say or from a reliable source (Bimmerpost is probably not ).

[Wires]

It's more the slip is the issue. If the clutch packs wear, and the then slip, it glazes the surfaces and it's all downhill after that.

Will it happen? Who knows? The reality is launch mode is bad for the car, launch mode + drag mode is even worse. But the choice is there should you be willing to "pay to play".

[bandook]

Originally Posted by Wires

It's more the slip is the issue. If the clutch packs wear, and the then slip, it glazes the surfaces and it's all downhill after that.

Will it happen? Who knows? The reality is launch mode is bad for the car, launch mode + drag mode is even worse. But the choice is there should you be willing to "pay to play".

Do auto transmission clutch packs "glaze"? I've never heard that. Perhaps if the fluid was super hot, but the clutches will likely just wear faster. I know that I'm wearing the trans faster, that's an obvious. But I knew I was wearing everything faster when. I swapped in a larger turbo and cranked up the boost and timing. Drag mode is just the next level. And it's amazing.

[Ls_swap_everything]

Not sure if anyone is going to ever follow up on this thread again, but here's my experience I have a 8hp70 behind a twin turbo ls3 and it's has been handling 800lbs of wheel torque for a little over 3 months now and about 3000km, it's being managed by a turbolamik controller. I also have a buddy who runs a shop that has a 8hp75 in his x5 that has been seeing well over 800lbs of wheel torque for over 3yrs now. He has a 340i as well that's been seeing a consistent 700lbs of wheel torque as well.

The big thing everyone messes up on is listening to BMWs "lifetime" fluid bullcr*p. If you contact zf they will explain that it's recommended the fluid is changed 80-100k km depending on driving conditions and other factors. A good scanner or access to inpa or ista, will allow you to see a "gear box oil wear" code indicating it needs to be done, it's shadow code that doesn't cause a warning light so you have to go looking for it module by module.

Also side note someone made over a 1000hp with the b58 haha

[BMWILUVU]

Originally Posted by Ls_swap_everything

Not sure if anyone is going to ever follow up on this thread again, but here's my experience I have a 8hp70 behind a twin turbo ls3 and it's has been handling 800lbs of wheel torque for a little over 3 months now and about 3000km, it's being managed by a turbolamik controller. I also have a buddy who runs a shop that has a 8hp75 in his x5 that has been seeing well over 800lbs of wheel torque for over 3yrs now. He has a 340i as well that's been seeing a consistent 700lbs of wheel torque as well.

The big thing everyone messes up on is listening to BMWs "lifetime" fluid bullcr*p. If you contact zf they will explain that it's recommended the fluid is changed 80-100k km depending on driving conditions and other factors. A good scanner or access to inpa or ista, will allow you to see a "gear box oil wear" code indicating it needs to be done, it's shadow code that doesn't cause a warning light so you have to go looking for it module by module.

Also side note someone made over a 1000hp with the b58 haha

The 8hp70 and 75 have structure and internals that can handle higher loads and engineers build in a safety factor normally 15% but if what you are trying to say is these transmissions are bullet proof search for transmission slippage posts on the forum. There may be one or two snapped shafts in there too.

[Ls_swap_everything]

Originally Posted by BMWILUVU

The 8hp70 and 75 have structure and internals that can handle higher loads and engineers build in a safety factor normally 15% but if what you are trying to say is these transmissions are bullet proof search for transmission slippage posts on the forum. There may be one or two snapped shafts in there too.

I'm not saying that they're bullet proof, just that they can withstand significantly higher torque then they are rated for, maintenance is the biggest thing that affects the durability of these trans