What did you do to/for your 1er today?

[fast1eddy]

Originally Posted by cjb762

Whiteline rear subframe bushings done! This was actually really easy, and took just over 4 hours. I just picked up a bushing removal tool on eBay for $67.50, and followed syenisch's instructions. (https://www.1addicts.com/forums/showthread.php?t=671569&highlight=Rear+Subframe+Bu shing+Tool+OR+an+alternative)

I may have just gotten lucky, but my bushings came straight out very easily without heat or lubrication.

I haven't had a chance to go for a drive yet though - have to turn to on the wife's list first.

Do you have a link to the bushing tool ?

[Suprgnat]

Originally Posted by chris_flies

Huh, I thought ours was the same, oh well.

The larger piston is exclusively for the fronts, look at the system diagrams on TIS. I actually had a discussion about that with someone else in another thread.

If you'e interested in a follow up, this slide show prep for the ASE Brake certification test is excellent:

Fig. 69-28 to 69-31

https://www.slideshare.net/mobile/mcfalltj/chap69

[chris_flies]

Originally Posted by Suprgnat

Not how that works. Google take-up cylinder. The take up cylinder may only effect the front, but the "working area" is still only 22mm or whatever.

According to newTIS, there is no Quick Take-Up valve in the hydraulic system, as would be necessary for that to work. The two master cylinder outlets, again, according to newTIS, never have an opportunity to combine flow. Our DSC module is almost the same as what was in the E46, it doesn't have much of the cool complex stuff really modern cars have. And I can't see how it would be incorporated into the master cylinder, because there simply doesn't appear to be the facilities/space for it (based on the 15 minutes of reading I've done).

https://www.newtis.info/tisv2/a/en/e...system/1tHNoSj

And it just wouldn't make sense from just feeling the difference in the brakes. They would feel the same after the take-up after the MC swap, and they simply do not. The pedal is MUCH shorter and heavier.

[cjb762]

Originally Posted by fast1eddy

Do you have a link to the bushing tool ?

Sure - should have thought to include that...

https://www.ebay.com/itm/BMW-E82-E90...4/333158778716

[WDE82]

Originally Posted by chris_flies

According to newTIS, there is no Quick Take-Up valve in the hydraulic system, as would be necessary for that to work. The two master cylinder outlets, again, according to newTIS, never have an opportunity to combine flow. Our DSC module is almost the same as what was in the E46, it doesn't have much of the cool complex stuff really modern cars have. And I can't see how it would be incorporated into the master cylinder, because there simply doesn't appear to be the facilities/space for it (based on the 15 minutes of reading I've done).

https://www.newtis.info/tisv2/a/en/e...system/1tHNoSj

And it just wouldn't make sense from just feeling the difference in the brakes. They would feel the same after the take-up after the MC swap, and they simply do not. The pedal is MUCH shorter and heavier.

We should put this discussion in the F30 grey brembos thread. There's more to be learned and decided in terms of the best setup and I know at least myself, you, and Suprgnat are interested in finding that setup.

https://www.1addicts.com/forums/show...php?p=26595247

[Suprgnat]

Originally Posted by chris_flies

According to newTIS, there is no Quick Take-Up valve in the hydraulic system, as would be necessary for that to work. The two master cylinder outlets, again, according to newTIS, never have an opportunity to combine flow. Our DSC module is almost the same as what was in the E46, it doesn't have much of the cool complex stuff really modern cars have. And I can't see how it would be incorporated into the master cylinder, because there simply doesn't appear to be the facilities/space for it (based on the 15 minutes of reading I've done).

https://www.newtis.info/tisv2/a/en/e...system/1tHNoSj

And it just wouldn't make sense from just feeling the difference in the brakes. They would feel the same after the take-up after the MC swap, and they simply do not. The pedal is MUCH shorter and heavier.

The quick take-up valve bis built into the master cylinder. Did you look at the link I provided? I don't see the master cylinder broken down in the link you provided, but assuming you're correct, I don't understand why BMW would run the front brake hydraulics at 77% of the line pressure of the rear 128i vs 135i or 71% M3 vs 128i.

Just, no.

"Shorter" is exactly what the take-up cylinder is designed to do. It also fixes the soft pedal because both circuits of the hydraulic system are equally pre-"charged".

[WDE82]

Today I programmed +SPBR into my VO and disabled Brake Fade Compensation and Engine Power Reduction to prevent brake fade.

After bedding my new brakes I went into ISTA/D and actually had a DSC fault code for power reduction so I must've triggered the system since it thought I had stock 128i brakes still. Definitely a good mod.

Not sure how much pedal feel was improved or not by SPBR. I think the 135i cylinder will solve all of it.

[chris_flies]

Originally Posted by Suprgnat

The quick take-up valve bis built into the master cylinder. Did you look at the link I provided? I don't see the master cylinder broken down in the link you provided, but assuming you're correct, I don't understand why BMW would run the front brake hydraulics at 77% of the line pressure of the rear 128i vs 135i or 71% M3 vs 128i.

Just, no.

"Shorter" is exactly what the take-up cylinder is designed to do. It also fixes the soft pedal because both circuits of the hydraulic system are equally pre-"charged".

I did, and having the MC's on the bench, it didn't look like there was any sort of valving in the ports where the reservoir sits, but I could very well be wrong.

The take-up would not explain, though, the obvious change in pedal feel after installing the M3 master cylinder. Yes, it does grab higher on the pedal, as I would expect with a bigger bore. However, if it were a QTU MC, the pedal pressure/feel would return to normal as I go through the stroke of the pedal, after it's taken up the slack, pressure is built-up, and the bypass has opened.

The MC was the only thing I changed at that time, too, so I'm not mixing it up with any other modification.

[Suprgnat]

Originally Posted by chris_flies

However, if it were a QTU MC, the pedal pressure/feel would return to normal as I go through the stroke of the pedal, after it's taken up the slack, pressure is built-up, and the bypass has opened.

You still haven't checked out the link I provided. This is covered in Slide 57

The larger take-up cylinder is absolutely the reason your pedal feels different/better. Pedal pressure is consistent and linear BECAUSE of the larger take-up cylinder combined with the larger brake piston displacement.

It's what the take-up cylinder and valve are designed to do.

It's their only reason for being.

[chris_flies]

Originally Posted by Suprgnat

You still haven't checked out the link I provided. This is covered in Slide 57

The larger take-up cylinder is absolutely the reason your pedal feels different/better. Pedal pressure is consistent and linear BECAUSE of the larger take-up cylinder combined with the larger brake piston displacement.

It's what the take-up cylinder and valve are designed to do.

It's their only reason for being.

Sorry, your explanation, and how I read it seemed to indicate that it would be taken out of effect as soon as pressure was built up to a sufficient level in the hydraulic system, and that the higher pressure piston would be responsible for the rest.

Sounds like it just really doesn't matter...

[Suprgnat]

Originally Posted by chris_flies

Sorry, your explanation, and how I read it seemed to indicate that it would be taken out of effect as soon as pressure was built up to a sufficient level in the hydraulic system, and that the higher pressure piston would be responsible for the rest.

Sounds like it just really doesn't matter...

Exactly. As soon as a whole bunch of fluid quickly fills the "extra" volume created by the larger pistons and "takes up" the pad to rotor gap, the pressure builds and the valve closes and allows the extra fluid and pressure to continue to build equally, in a linear fashion, in both brake circuits.

I'm sorry I'm not explaining this well.

Let's say a 57/42 system with a 1 mm (round numbers) pad-to rotor gap with a 22 mm master cylinder.

The volume of fluid required to close the gap is:

Vfront = 28.5^2*PI*1 = 2551.76 mm^3
Vrear = 21^2*PI*1 = 1385.44 mm^3

Amc = 11^2*PI = 380.13 mm^2

That means it requires 1385.44/380.13 = 3.64 mm stroke to close the gap on the 42 mm cylinder before it starts building pressure.

Meanwhile: the front gap has only closed 1385.44/2551.76 mm = .543 mm.

So now we're building pressure on the rear and the MC piston still needs to move another 2551.76-1385.44 = 1166.32/380.13 = 3.068 mm until the front pad contacts the rotor (remember: round numbers) and the front brakes start to build pressure.

Soft pedal, because the fronts which provide the bulk of the braking aren't engaging fully, and long travel.

The take-up piston quickly fills the 2551.76-1385.44 = 1166.32 mm^3 volumetric difference between the front and rear brake caliper piston displacements allowing the front and rear hydraulic systems to build pressure equally.

[chris_flies]

Originally Posted by Suprgnat

Exactly. As soon as a whole bunch of fluid quickly fills the "extra" volume created by the larger pistons and "takes up" the pad to rotor gap, the pressure builds and the valve closes and allows the extra fluid and pressure to continue to build equally, in a linear fashion, in both brake circuits.

I'm sorry I'm not explaining this well.

Let's say a 57/42 system with a 1 mm (round numbers) pad-to rotor gap with a 22 mm master cylinder.

The volume of fluid required to close the gap is:

Vfront = 28.5^2*PI*1 = 2551.76 mm^3
Vrear = 21^2*PI*1 = 1385.44 mm^3

Amc = 11^2*PI = 380.13 mm^2

That means it requires 1385.44/380.13 = 3.64 mm stroke to close the gap on the 42 mm cylinder before it starts building pressure.

Meanwhile: the front gap has only closed 1385.44/2551.76 mm = .543 mm.

So now we're building pressure on the rear and the MC piston still needs to move another 2551.76-1385.44 = 1166.32/380.13 = 3.068 mm until the front pad contacts the rotor (remember: round numbers) and the front brakes start to build pressure.

Soft pedal, because the fronts which provide the bulk of the braking aren't engaging fully, and long travel.

The take-up piston quickly fills the 2551.76-1385.44 = 1166.32 mm^3 volumetric difference between the front and rear brake caliper piston displacements allowing the front and rear hydraulic systems to build pressure equally.

Ok, now THAT is making sense to me. Thanks!

See, I'd have never known about this little design feature.

[Skotcoop]

Originally Posted by chris_flies

Not for a 128i. The Delphi coils are the latest iteration of the part for our cars.

Oh gotcha.

[Skotcoop]

Originally Posted by ShocknAwe

Coils I recommend sticking with the most up to date OE coils or going with the Precision Raceworks kit.

Extensive testing of all the coil options hasn't shown a difference or need for anything else. wish I could link to the forum where the data is.

Check out Eldor as a compnay and read about the company itself and you'll want Eldors. Its a pretty cool story. They're all about top notch quality and I believe they are made better than the others. Plus my brother recommended I get those when I replaced all mine.

[ShocknAwe]

Originally Posted by Skotcoop

Check out Eldor as a compnay and read about the company itself and you'll want Eldors. Its a pretty cool story. They're all about top notch quality and I believe they are made better than the others. Plus my brother recommended I get those when I replaced all mine.

It's just another supplier. Same as Bosch and Delphi. Story doesn't matter.

Much like lemforder meyle corteco Debi Bilstein and all the rest...

[BMWWorld]

Yesterday I took the rear seat out. It's fun when you forget that the bolts on each side of the brackets has to come out. lol

[schmidtp]

Finally got new RB turbos on along with a bunch of other engine goodies, lowering springs, and M3 control arms. No wastegate rattle and car feels brand new around corners.

[BMWWorld]

Putting the finishing touches on my reshaped forged carbon fiber steering wheel. I'm also working on a forged carbon fiber e-break handle.

[Petro135]

Replaced auc sensor. Weird part is I removed that months ago when i changed to bms cabin filters never threw a code. Hit 4th gear at high rpms, went into limp mode. Next day my a/c was warm. I figured I had a leak. So I put in auc sensor no more codes. Had dye put into a/c. No leaks. Filled it up and it works great.
Not sure whats going on. Lol

[BMWWorld]

Some progress

[WDE82]

Put in the 135 master cylinder. It's not that bad of a job. ISTA D bleeding did not act as anticipated like INPA did with you E46. INPA ran the reservoir from max to min on each wheel by cycling each wheel's circuit. The E82 DSC just gives a few pulses and tells you to press the pedal. Before that you're supposed to pressure bleed it. So...dang. Gonna bleed the old fashioned way tomorrow. Shoulda bought a motive power bleeder (lost my last one).

[dtla1]

Originally Posted by WDE82

Put in the 135 master cylinder. It's not that bad of a job. ISTA D bleeding did not act as anticipated like INPA did with you E46. INPA ran the reservoir from max to min on each wheel by cycling each wheel's circuit. The E82 DSC just gives a few pulses and tells you to press the pedal. Before that you're supposed to pressure bleed it. So...dang. Gonna bleed the old fashioned way tomorrow. Shoulda bought a motive power bleeder (lost my last one).

I've always read that there was an automated bleeding procedure like you mentioned you had for the E46. I've never tried it before but might be useful to try a bit more searching around the forums including e90post to double check?