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post #1 of 51 (permalink) Old 04-27-2008, 02:42 AM Thread Starter
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BC Coilover Install

This is meant more of a general guide, not very in depth and assumes you know your way around a car and tools already. If you don't believe you have the means or know how to go forward with this install please let a professional do it. Having said that, onto the fun!


The included instructions with the BC kit are translated literally from Taiwanese so this makes them a pain in the ass to read. If you read it over a few times most of it makes sense. Don't adjust the spring heights without also adjusting the shock heights, this will ensure that travel stays the same with whichever ride height you choose. The shocks come preset at level 8 on the dampening, 0 is full hard and 30 is full soft. They turn with a nice distinct click that you can hear and feel. The rear shocks are adjustable once everything is bolted up but they are kind of a pain to reach through the access panels in the trunk. I set mine right in the middle and figured I'll try it out for a bit and adjust as needed. So that covers the pre-installation stuff, here's some pictures.

I highly recommend using a lift if you have one available. I'm lucky enough that my father is an ASE Master Technician of 30 years, good to have connections.



We started with the rear suspension because I also had a SU rear mount to install and we wanted to let the car cool after the drive. It also looked easier and we were feeling lazy at 6 in the morning. Here's what you'll be looking at from the rear. Remove the bolt that connects the control arm to the spindle, undo the endlinks from the top and swing the sway bad forward and out of the way. After that you can pull the arm down and the spring will come right out. The shock is held onto the tower by two nuts, easily removed and one bolt through the spindle. Install the new shocks first, with the shorter BC coil in if you attach the control arm before putting the shock in it becomes a pain in the ass. Ask me how I know. Really.



BC shock installed.

[img width=576 height=768]http://img.photobucket.com/albums/v133/Wastegate13/newcar021.jpg[/img]

After this you can put the coils in. Make sure that the heights are even from side to side and that the locking collars are nice and tight. The adjustable perch goes into the control arm, the silver plate removes and goes on the bottom and then screws in to hold it nice and snug. The rubber bumper goes to the top obviously, with the suspension drooped like this don't be alarmed that the springs look as if they'll come right off the perches, once everything is bolted up it sits flush and once the weight of the car is on them they aren't going anywhere.

See what I mean? Almost scary!



Everything buttoned up. Rear suspension done.



Now onto the fronts. The factory setup looks a lot like this.



Remove the large bolt thats through the strut collar. Also remove the clip holding the brake line and the swaybay link holding the ABS wire bracket. Roll the endlink back out of the way and try not to snag the brake line of the ABS wire on anything during the removal.

[img width=576 height=768]http://img.photobucket.com/albums/v133/Wastegate13/newcar025.jpg[/img]



Remove the 3 bolts from inside the engine bay that attach the top of the strut, don't worry about it falling it isn't going anywhere. Now the really fun part. This collar is a pain in the ass. We used a pry bar to wedge into it and spread it slightly. Then we used another pry bar to gently push on the bottom of the strut to get it to work its way up. We also used some PB blaster to help out.



Comparison shot of the stock strut and the BC coilover. Lots more room on the inside for some wider tires. :P



The BC coilover uses 3 studs to attach to the tower so you'll need to slide that up and start them to hold it in the car. The wider of the 3 sides goes toward the engine bay. Rotate the shock body so that brackets are on the right side and the alignment tab at the bottom faces the engine bay. We used a small step box and just lowered the car down slowly to get the shock into the collar. You could also use a screw jack or just force but we found this to be a lot easier.

[img width=576 height=768]http://img.photobucket.com/albums/v133/Wastegate13/newcar030.jpg[/img]

After you do that reinstall the brake and ABS lines, make sure to reinstall the clip. We had to bend the ABS bracket so that it wouldn't rub the inside of the wheels. I got this tip from another forum where someone had installed the BCs and Street Unit also included a note to that effect with my invoice. It is not stated in the BC manual however. Put the wheels back on, torque the lugs and set the car down to see your new stance!

Front



Rear



Anytime you change suspension pieces an alignment is necessary. You can't eyeball things and know that they are correct, you need to verify. Toe settings particularly, if off, can chew a set of tires very quickly and we all know our Potenzas aren't cheap. Thankfully everything was in spec for me as it was, only requiring a slight change in front toe to be where we wanted. For some odd reason the left rear has more negative camber than the right rear does. It is not adjustable from the factory but mine is in spec on both sides, just not even. I will keep a close eye on the tires but I will more than likely pick up a set of camber links anyway.



Here's a bonus shot beside my father's coworker's Buell. I really like his bike. I might pick one up, who knows.







Oh looky!

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post #2 of 51 (permalink) Old 04-27-2008, 02:56 AM
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Re: BC Coilover Install

Looks damn good man.
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post #3 of 51 (permalink) Old 04-27-2008, 01:31 PM
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Re: BC Coilover Install

wow...that looks sexy as hell..i just installed my h&r springs yesterday but god damn thats beautiful ha

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post #4 of 51 (permalink) Old 04-27-2008, 03:40 PM
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Re: BC Coilover Install

love it! You'll have to give a write up on a review of these coilovers. I am interested, but who the hell is "BC"? Let us know how they ride and whatnot.

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post #5 of 51 (permalink) Old 04-27-2008, 03:46 PM
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Re: BC Coilover Install

we need to meet up wastegate. u down to go to moroso? or shoot out on the pamletto or something?

asfor brandon...im sponsored by bc..i've been on them for about 4 weeks now i think...im loving em. its my 3rd suspension setup and i'll never change from these


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post #6 of 51 (permalink) Old 04-27-2008, 04:16 PM Thread Starter
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Re: BC Coilover Install

[quote author=jhershorin link=topic=110060.msg2267808#msg2267808 date=1209321987]
we need to meet up wastegate. u down to go to moroso? or shoot out on the pamletto or something?

asfor brandon...im sponsored by bc..i've been on them for about 4 weeks now i think...im loving em. its my 3rd suspension setup and i'll never change from these
[/quote]

I'm not sure if I'll ever take this car to the drag strip, after my last car this one would be a big disappointment. I'm going to autocross for the first time thus weekend, that should definitely be interesting.

I only 900 miles on the stock suspension but there isn't a big difference between these and stock that I see. They are stiffer but the ride is not objectionable at all. I also found that the rear mount is nowhere near as bothersome as most people make it out to be. If the car came with the streetunit mount from the factory no one would know.

Oh looky!

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post #7 of 51 (permalink) Old 04-27-2008, 04:49 PM
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Re: BC Coilover Install

How did you set up the suspension. I am running 7 clicks from full hard in the rear and 11 clicks from full hard in the front.


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post #8 of 51 (permalink) Old 04-28-2008, 09:07 AM
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Re: BC Coilover Install

Thanks for pointing me here. Those rims look fantastic on the White.


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post #9 of 51 (permalink) Old 04-28-2008, 09:22 AM Thread Starter
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Re: BC Coilover Install

[quote author=LaraW link=topic=110060.msg2269110#msg2269110 date=1209384477]
Thanks for pointing me here. Those rims look fantastic on the White.
[/quote]

Thanks, that means a lot coming from you because your car=teh sechs. I finally figured out why I prefer the sedan in non speed trim. The grille doesn't protrude upward into the hood. I want to do a few more small mods to the exterior but nothing major, small touches that are only noticable to other 3 owners.

Oh looky!

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post #10 of 51 (permalink) Old 04-28-2008, 10:09 AM
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Re: BC Coilover Install

Yes! Thank you. Subtle mods are my preference... I never understood people who are so incredibly flashy with modding their vehicles (and that is not limited to Mazda3 owners).

I'd suggest smoking the reflectors would look fantastic... they'd go very well with the black rims. Removing the side moldings would be fantastic too.


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  Mazda3 Forums : The #1 Mazda 3 Forum > Technical / Model / Performance > MazdaSpeed > MazdaSpeed3 Brakes and Suspension

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