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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > A dairy for my e90 335i LCI BBK project



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      06-14-2022, 03:22 AM   #1
antixie
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A dairy for my e90 335i LCI BBK project

Hello there, I'm a new holder of an e90 335i LCI sedan from Japan.

This story is to be a diary or archive for my car's mod, turning it from a regular BMW to MY CAR. Hence, there're tons of PERSONAL preferences and biases.

It couldn't be a reference, but a pure dairy.

However, please make a correction if I'm wrong on some critical points, Thanks!

=========================================

The story begins 2 weeks ago when my car's electric pump broke.

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Since I have to have it repaired, I want to somehow "strengthen" it for better street/touge performance.
I don't bring it to a track, but I'm planning to.

At the moment my car is totally original, except for the genuine 400M wheels setup (F:225/40/18@8Jx18 ET34+3mm spacer; R:255/35/18@8.5Jx18 ET47+15mm spacer).

Then I got a set BMW Performance BBK from ECS tuning.

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Yes, I have done a little bit of research, that this BBK should be a DOWNGRADE from the stock brake sets because of smaller sizes. The reason I go for it is purely one thing: color.

I'm not a big fan of the Big 6-pot calipers in red or blue, which looks like a statement something like "I'm fast".
On the other hand, the phoenix gold Performance BBK grabs my eyes, and it should be a nice accent for my white car.

And, compared to the F30/80 ///M performance BBK (which also offers a phoenix gold one), the 370/340 rotor seems too big and heavy.
In Japan, which is surrounded by tons of low-speed corners (AKA. touge), most of the time I wouldn't make hard breakings like such in tracks.
So, the thing I'm serious about is WEIGHT reduction for the 1600+kg body.
(And the cheaper 135i rotors)

I'm assuming that the brake force itself is sufficient, and the front tires' width is a more critical matter.
So I'm going to go for a 255/30/18 @9Jx18 ET?? square setup in the future.
The BMW Performance BBK may offer better controllability by the 28/32/36mm diameter piston setup.

For the reducing thermal ability, I'm planning for a set of DIY CFRP air ducts.

So here is my plan:
1. Reinforce my BMW Performance BBK into steel pistons from RacingBrakes, to prevent cracks of the ceramic piston caps.

2. Have the ///M3 front control arms swapped to increase a little bit camber angle.

3. Fit the rear brake rotors and calipers for the M135i's

4. Have the 255/30/18 @9Jx18 square tire setup

5. If not satisfied, swap to F30/80 ///M performance BBK


If somebody gots a similar experience, please don't hesitate to lend me some knowledge

I'll make further updates later. Have a nice day!

Last edited by antixie; 06-14-2022 at 09:37 AM.. Reason: correction
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      06-14-2022, 09:38 AM   #2
antixie
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1 - BMW Performance BBK Reinforcement

As we all know, the BMW Performance BBK has a poor reputation - it cracks.

But luckily there is a potential to prevent it. Yes, the rebuild kit.

I got it from RB for the pistons, then got the sleeves from another eBay shop.


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Here are my kits.

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This is what the pistons looked like.

I have researched for a while, and have found there're aluminum pistons offered by stoptech, and these steel ones from RB.

Due to the pistons working in bad thermal circumstances, I just assumed the steel ones could be a little bit more reliable.
And, the RB made them "teeth" to block the heat into brake fluids.


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Here are the optional tools.

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I bought a portable electric air compressor, attached a nozzle, and tried to pull out the genuine pistons.

Luckily, the calipers gave me 4 caps to protect the brake line holes (see the blue stuffs).
So I made a tiny cut on one, the pumped air in the caliper.

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It works!

Last edited by antixie; 06-14-2022 at 10:31 AM.. Reason: update
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      06-14-2022, 09:39 AM   #3
antixie
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2 - ///M3 front control arms

Coming soon.
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      06-14-2022, 09:40 AM   #4
antixie
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3 - Rear brakes' fitments

Coming soon.
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      06-14-2022, 09:41 AM   #5
antixie
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4 - 255/30/18 @9Jx18 square tire setup

I just moved the content to the tire & wheels section.

It can be checked HERE.

Last edited by antixie; 06-15-2022 at 10:04 AM.. Reason: update
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      06-14-2022, 09:42 AM   #6
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5 - Conclusions

Coming soon.
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