E9X E93 M Performance f30 retrofit kit Review

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matreyia

Captain
Apr 19, 2017
1,197
This is a review of the F30M performance retrofit kit for e9x 335i cars. See video.

There are several issues on install. No perceived performance gains so far.


1. kit is supposed to fit 18 inch and larger - 18 inch wheels will rub the pad and scrape paint off a little.
2. kit does not fit rear wheel carrier - you have to dremel off corners of the carrier to allow bolt to slide past
3. brake sensor does not fit e93 connector - unusable.
4. no perceivable brake performance gains yet.
5. m3 rotor included does not have matching rotor screw holes so you have to use wheel lug bolts to attach rotor to wheel and hub.

VERY EXPENSIVE for what it doesn't do.
 
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matreyia

Captain
Apr 19, 2017
1,197
M3 rotor is 4lbs over normal rotor ecs two piece. However, caliper is 4 lbs lighter than stock caliper. So heavier rotating mass and lighter caliper. A loss in performance I would guess.
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langsbr

Lieutenant
Apr 5, 2017
909
What kind of performance gain were you expecting from upgraded brakes? Is a common misconception that bigger brakes will stop quicker. The best performance mod for shorter stopping distances is better tires.

With abbk you should see improvement in fade resistance, especially in heavy user such as on the track.

Also, expecting it to fit '18s or larger' is another misconception. My Apex ec7s clear my ap racing 356mm kit with no problems, but my buddy's M style 18s had the caliper hit the wheel weights.

I was going to order a brembo 6piston 410mm setup for the wife's Escalade, but when I used the caliper template they provide, no chance. After closer inspection, her stock brakes have only a 1/4 inch of space with the wheels she runs and they are 24s!

Wheel style, concavity, and offset play in just as much as diameter does.
 
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matreyia

Captain
Apr 19, 2017
1,197
Ou this is an ecs kit?
Yes. There is an update: The back of the brake pads will rub against your inner wheel if you do not use a center punch tool and hammer to make sure the pad lock rods are totally hammered into place.

So they do actually fit 18's if you hammer in the lock rods for the pads. I will make an updated video soon.
 

Jeffman

Captain
Jan 7, 2017
1,242
VT, I must say I really enjoy your videos. If you start a YouTube channel I will be your first subscriber.
 
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Rob09msport

Captain
Oct 28, 2017
1,316
Monroe CT
I'm guessing over stock its lighter or same weight but the ecs 2 piece rotors are very nice. Also really need to change master cylinder to get full benefit when increasing piston area. Pad is most important along with tire compound for stopping distance and feel, fluid and rotor size are for fade like langsbr said and caliper is combo of all "less flex helps consistency ,even pressure application from multiple pistons sized properly , ability to isolate heat from fluid , pad size for longevity not performance" if within thermal limits a pad half the size with the same amount of pressure applied will stop just as hard as a pad twice the size with same amount of pressure, sometimes actually can be worse due to dust and gas buildup.
 
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Jeffman

Captain
Jan 7, 2017
1,242
I mounted the two-piece ECS rotors a few months ago and like them a lot. I can feel a difference - lower unsprung weight compared to stock. And they look cool too poking through my silver Apex ARC-8s. Now I just need to refresh my stock rotors and install my MSport front bumper that was just delivered this morning.
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matreyia

Captain
Apr 19, 2017
1,197
Ok, today the rear upgraded brakes saved my ass so I ordered the front performance kit arriving next week.

There was a guy who cut across two left lanes to make a right turn. I literally slammed on brakes when I saw his car smack in front of mine. And thank god it stopped on a dime.

Still he clipped my front bumper and ripped the invisishield film of the edge of the front bumper. So now I have to reinstall the film. Thank zeus that I had the film installed...otherwise I'd have to repaint the new bumper.
 
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