[CoolATIGuy]

I am xDrive 6MT as well fwiw

[kern417]

Originally Posted by YuminNuman

Well the 550 clutch and new dmf are cooked. I was getting flywheel protection codes, and now all the clutch codes again, every time. During a pull it has been doing this weird lurch for a fraction of a second, and the 4th gear hill test just slipped good. Damn.i think the flywheel has a bad spot on it, just like on page 2.

It lasted 14k, 15 months, of horrible jack ass driving. Really I cooked it last August with a 5.5k sidestep launch. Don't do that. A few months ago I ripped through 5th and somehow it burnt again. If you aren't an asshat with it, I would think it would last longer.

I got this osprey v2 intake, sounds amazing, so I had to put the catless pipe on again and it's been otherwise running great. Bm3 stg2+ e50, stock turbo, too much low torque. The turbo at least sounds great.

I guess it will be lightweight aluminum single mass with something good. I'm scared of aftermarket junk here. We have f30_supraman saying spec and clutchmasters burnt up. Kern has suggested motiv. Any other good reviews on aftermarket kits? I actually hate this, but maybe it will be good, a light flywheel will be nice.

I still eventually want to do the LSD, turbo, port injection, and pro tune, so 600 area, really 700tq, AWD.. reliable daily driver. Stiff pedal and weird engagement is ok, it's just the chatter thing and longer durability.

Absolutely do not launch the car on the 550i clutch.

It can hold a lot of torque. It cannot handle a lot of heat.

I think I'm closing in on 20k, 5-10k of that at 600whp and it's holding. I drive fast and do highway pulls, but you won't see me launching and doing burnouts everywhere.

[matteo]

Has anyone played with torque by gear % reduction (in bm3 specifically)?

I'm in the middle of breaking in my new 550i clutch and was wondering if reducing all the gears by around 20% would bring the Stage 2+ E30 torque numbers from ~570 ft/lbs down to the 550i's rated ~450 ft/lbs?

Or if it would make sense to just run a Stage 2 E30 and calling it good?

[G.Newt]

Originally Posted by matteo

Has anyone played with torque by gear % reduction (in bm3 specifically)?

I'm in the middle of breaking in my new 550i clutch and was wondering if reducing all the gears by around 20% would bring the Stage 2+ E30 torque numbers from ~570 ft/lbs down to the 550i's rated ~450 ft/lbs?

Or if it would make sense to just run a Stage 2 E30 and calling it good?

Send it with stage 2+ e30 and call it good.

[matteo]

I think I decided that a reduction of 15% across all the gears will be the sweet spot (for me). BMW builds in an ~8% increase in torque with the MPPSK on the stock clutch, so if you give the 550i clutch the same 8% increase, it bumps it's F10 rated 443 ft/lbs up to about 480 ft/lbs. A 15% reduction from a Stage 2+ E30 should fall right around there.

At the end of the day, as I understand it, just flattens out the torque curve? Much like it would when you're dealing with traction, just swap the logic to the clutch. Right?

This way I should never have to worry about clutch slippage for seemingly it's entire life, and enjoy a flatter torque curve, all on an OTS map... As long as I don't drive like a dingbat.

Logic based on this post:

https://f80.bimmerpost.com/forums/sh....php?t=1579736

[G.Newt]

Originally Posted by matteo

I think I decided that a reduction of 15% across all the gears will be the sweet spot (for me). BMW builds in an ~8% increase in torque with the MPPSK on the stock clutch, so if you give the 550i clutch the same 8% increase, it bumps it's F10 rated 443 ft/lbs up to about 480 ft/lbs. A 15% reduction from a Stage 2+ E30 should fall right around there.

At the end of the day, as I understand it, just flattens out the torque curve? Much like it would when you're dealing with traction, just swap the logic to the clutch. Right?

This way I should never have to worry about clutch slippage for seemingly it's entire life, and enjoy a flatter torque curve, all on an OTS map... As long as I don't drive like a dingbat.

Logic based on this post:

https://f80.bimmerpost.com/forums/sh....php?t=1579736

You're overthinking this way too much. I ran 335is clutch with DAW turbo. Stage 2+ E30 is fine. Install it and send it.

[matteo]

Of course this happens...

500 miles of city break in, stock tune, no more than 1/2 throttle, no more than 3500 RPMs, then I flash to Stage 2 E30, and I get this - with only ~455 ft/lbs.

WHY!

[kern417]

Are you sure the flywheel was good when you installed the clutch?

[matteo]

Originally Posted by kern417

Are you sure the flywheel was good when you installed the clutch?

Brand new OEM DMFW from FCP... installed at the same time as the clutch.

[B58 parts]

Yeah that's what I had, same codes. Over time that slightly damaged one will change to damaged and then severely damaged. The 550 clutch is right on the edge. Didn't work for me too long. If you flash down to stage one and still get that I might suspect installation did everything get cleaned off and is holding torque. Otherwise your motor is probably just too spicy for it. I think the all-wheel drive probably has something to do with it too. Looks like we have similar results. And maybe the rear wheel drive folks are doing all right.

[toxik]

Originally Posted by B58 parts

Yeah that's what I had, same codes. Over time that slightly damaged one will change to damaged and then severely damaged. The 550 clutch is right on the edge. Didn't work for me too long. If you flash down to stage one and still get that I might suspect installation did everything get cleaned off and is holding torque. Otherwise your motor is probably just too spicy for it. I think the all-wheel drive probably has something to do with it too. Looks like we have similar results. And maybe the rear wheel drive folks are doing all right.

is a 550i clutch worth upgrading to over stock for stock or stage 1 power levels? i’m also xdrive and i dont know if there’s downsides to going 550i clutch if im not planning on making big power on my motor.

[matteo]

Originally Posted by B58 parts

Yeah that's what I had, same codes. Over time that slightly damaged one will change to damaged and then severely damaged. The 550 clutch is right on the edge. Didn't work for me too long. If you flash down to stage one and still get that I might suspect installation did everything get cleaned off and is holding torque. Otherwise your motor is probably just too spicy for it. I think the all-wheel drive probably has something to do with it too. Looks like we have similar results. And maybe the rear wheel drive folks are doing all right.

I wonder if we just received bad kits/pressure plates? It looks like at least G.Newt was also xDrive and didn't seem to have any issues.

I just find it hard to believe that a brand new clutch rated for 445 ft/lbs on an F10 can't hold 445 ft/lbs on an F32.

Might send it back to FCP and try again.

[matteo]

Originally Posted by toxik

is a 550i clutch worth upgrading to over stock for stock or stage 1 power levels? i’m also xdrive and i dont know if there’s downsides to going 550i clutch if im not planning on making big power on my motor.

Seemingly most people have had very good luck with the 550i clutch. I've seen many reviews getting 550-600 ft/lbs and still holding.

The catch is, you have to be patient and bed the clutch in properly (500 miles of city driving, lots of shifting, low revs, low throttle), and what I've seen because the clutch is still organic, it doesn't like heat. So no launching, minimal/no slipping, etc.

As with my previous comment, the F10 550i rated torque is around 445 ft/lbs. Stage 1 numbers should keep you well below that.

and FWIW, the clutch feels amazing. Can hardly tell a difference from stock. Throw a cheap BMS clutch stop in there (minus one ring, IMO) and it's beautiful.

[G.Newt]

Originally Posted by toxik

is a 550i clutch worth upgrading to over stock for stock or stage 1 power levels? i’m also xdrive and i dont know if there’s downsides to going 550i clutch if im not planning on making big power on my motor.

If you wanted to make big power, you chose the wrong transmission. These 6-speeds like to be kept to under 600wtq.

[toxik]

Originally Posted by G.Newt

If you wanted to make big power, you chose the wrong transmission. These 6-speeds like to be kept to under 600wtq.

that’s what i always tell people when they ask me the same thing, i would’ve went zf8 if power was my goal. i use my f30 as a commuter car and 400whp has always been my sweet spot