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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > BC Coils inner clearance and camber



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      06-10-2014, 03:17 PM   #1
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BC Coils inner clearance and camber

I have 2 questions

1. I'm planning on getting a new set of wheels and some BC coils soon, but I'm a little concerned about the wheel clearing the coil since the coils look a little wider than the stock strut. Can someone that has these measure the clearance between the strut and the wheel and also post your wheel specs. My front wheels will probably be 19x9.5 et27, but I can change the offset if I need to clear the coilover.

2. How much fender clearance will I gain from camber? I think stock is around -.75 degrees and I want to have -1.5 degrees of camber up front. So how much will the top of the wheel move in with the extra -.75 degrees of camber?
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      06-10-2014, 10:48 PM   #2
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The issue on clearance when you got to coilovers normally comes from the factory strut/shock flares out at the mount so normally have no issues with clearance. Most coilovers use a threaded housing to raise and lower which puts the coil spring in contact with the tire in some cases.

What offset wheels are planned?
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      06-11-2014, 11:23 AM   #3
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Originally Posted by dinanm3atl View Post
The issue on clearance when you got to coilovers normally comes from the factory strut/shock flares out at the mount so normally have no issues with clearance. Most coilovers use a threaded housing to raise and lower which puts the coil spring in contact with the tire in some cases.

What offset wheels are planned?
The front offsets are in my first post, I'm not worried about the rear. With stock camber I would use 9.5et30, but I figured the extra -.75 degrees of camber should give me at least another 3mm.

9.5et27 245/35/19
11et36 275/30/19

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      06-11-2014, 08:42 PM   #4
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Will be close I would wager. Might need a small spacer.
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      06-11-2014, 10:32 PM   #5
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Originally Posted by dinanm3atl View Post
Will be close I would wager. Might need a small spacer.
I can pick the offsets so I am trying to avoid the spacer. I can go down to 9.5 et25 or 26, but I want to know how much camber I would need to get 5mm more clearance. I am trying to get the wheels perfectly flush.
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      06-11-2014, 11:19 PM   #6
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Unfortunately do not have that exact info. Sorry.
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      06-12-2014, 12:59 AM   #7
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Originally Posted by dinanm3atl View Post
Unfortunately do not have that exact info. Sorry.
Thanks I was hoping someone who has these can measure the inner clearance up front and also post wheel specs.
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      06-12-2014, 02:31 AM   #8
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Thanks I was hoping someone who has these can measure the inner clearance up front and also post wheel specs.
It's kinda difficult to get exact measurement, but i have no more than 9mm gap to my BC BR Racing shocks with 18x9.5 et22 and 225/40/18. According to @#Tee: Each degree of camber will pull the rim in 10-12mm.
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      06-12-2014, 03:56 AM   #9
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Originally Posted by MonacoBlueE90 View Post
It's kinda difficult to get exact measurement, but i have no more than 9mm gap to my BC BR Racing shocks with 18x9.5 et22 and 225/40/18. According to @#Tee: Each degree of camber will pull the rim in 10-12mm.
It's 5-6mm per degree of camber isn't it?
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      06-12-2014, 07:08 AM   #10
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Quote:
Originally Posted by MonacoBlueE90 View Post
It's kinda difficult to get exact measurement, but i have no more than 9mm gap to my BC BR Racing shocks with 18x9.5 et22 and 225/40/18. According to @#Tee: Each degree of camber will pull the rim in 10-12mm.
As long as you have 5mm of clearance then I should be fine with et27. Are you fairly certain about those measurements?

10-12mm is more than I expected with 1 degree of camber. If that's true it would be pretty easy to fit 9.5et22 without poking.
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      06-12-2014, 07:09 AM   #11
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It's 5-6mm per degree of camber isn't it?
That is closer to what I was thinking and if its right then I think et27 should be perfect.
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      06-12-2014, 07:51 AM   #12
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Quote:
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As long as you have 5mm of clearance then I should be fine with et27. Are you fairly certain about those measurements?

10-12mm is more than I expected with 1 degree of camber. If that's true it would be pretty easy to fit 9.5et22 without poking.
Yes i went out and tested it. 10mm thick piece didn't fit between my wheel and shock. Well it kinda fits but it was tight. 9mm thick piece went to that gap without problems, but had very little room to move like less than 1mm. So i determined that there is maximum of 9mm gap, of course it's not 100% accurate, so some tolerance would be good to take account.

Quote:
Originally Posted by SuperBmw View Post
It's 5-6mm per degree of camber isn't it?
This is what member #Tee said to me when i asked it some time ago. I don't really have idea about that. Direct quote of what he said back then,
Quote:
Just keep in mind each degree of camber will pull the rim in 10-12mm
I'm not going to question The guy who knows pretty much everything about fitment. I tried to use that tagging system, so #Tee would notice and could verify, but it doesn't seem to work or i did something wrong.
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      06-12-2014, 08:18 AM   #13
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sorry late on this guys, youll be perfectly fine with the 9.5 +27. theres plenty of inside gap...the bc body flares out at the body about 3mm (more than other coils). so at those specs theres at least 3mm gap.

youll be poking 4mm with the -.65 so adding another .75 youll be tucking at least 5mm. at this point you can just use the camber to control the poke but maximum poke would be 4mm (top of fender to rim). just be careful on the drive height cause the front stretch is very minimal. youre really pushing the limits of being functional flush with some meat on the tires + aesthetically pleasing flush/poke.
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      06-12-2014, 09:27 AM   #14
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Quote:
Originally Posted by #Tee View Post
sorry late on this guys, youll be perfectly fine with the 9.5 +27. theres plenty of inside gap...the bc body flares out at the body about 3mm (more than other coils). so at those specs theres at least 3mm gap.

youll be poking 4mm with the -.65 so adding another .75 youll be tucking at least 5mm. at this point you can just use the camber to control the poke but maximum poke would be 4mm (top of fender to rim). just be careful on the drive height cause the front stretch is very minimal. youre really pushing the limits of being functional flush with some meat on the tires + aesthetically pleasing flush/poke.
Sounds perfect. I know I am pushing it, but that is what I'm going for. I want the wheel flush instead of poking so I will camber it in so it's perfectly flush.

Thank You

Edit- how much camber do you think is needed for 9.5et22 to be flush with the fender.
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      06-12-2014, 09:31 AM   #15
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Quote:
Originally Posted by MonacoBlueE90 View Post
Yes i went out and tested it. 10mm thick piece didn't fit between my wheel and shock. Well it kinda fits but it was tight. 9mm thick piece went to that gap without problems, but had very little room to move like less than 1mm. So i determined that there is maximum of 9mm gap, of course it's not 100% accurate, so some tolerance would be good to take account.



This is what member #Tee said to me when i asked it some time ago. I don't really have idea about that. Direct quote of what he said back then,


I'm not going to question The guy who knows pretty much everything about fitment. I tried to use that tagging system, so #Tee would notice and could verify, but it doesn't seem to work or i did something wrong.
Thank you for checking for me. I know Tee really knows his stuff.
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      06-12-2014, 09:40 AM   #16
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Quote:
Originally Posted by bmw325i View Post
Sounds perfect. I know I am pushing it, but that is what I'm going for. I want the wheel flush instead of poking so I will camber it in so it's perfectly flush.

Thank You

Edit- how much camber do you think is needed for 9.5et22 to be flush with the fender.
i would say -1.5 would flush out a 9.5 +22 but a squarish tire would destroy the fender if its too low or hitting a bump at low speed turns in the parking lot (e92).

heres a 9.5 +22 225.35 10 +25 255.30 natural camber all around. on springs iirc..not sure if this reference helps any...i didnt take the pix.



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      06-12-2014, 09:48 AM   #17
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Quote:
Originally Posted by #Tee View Post
i would say -1.5 would flush out a 9.5 +22 but a squarish tire would destroy the fender if its too low or hitting a bump at low speed turns in the parking lot (e92).

heres a 9.5 +22 225.35 10 +25 255.30 natural camber all around. on springs iirc..not sure if this reference helps any...i didnt take the pix.



I thought 245 would be a little bit stretched on a 9.5" and since I would be adding camber so it's flush I figured it wouldn't be much different than et27. I have an e90, and I can roll my front fenders.

It seems like all the pictures I see with et22 poke even with camber
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      06-12-2014, 10:03 AM   #18
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oh if youre on an e90 youre safe, ya its just the angle of the shots the front bumper curves down and in alot so the poke is exaggerated. the 245.35 is a very minimal. try this formula ...i posted this a few times

you can imagin a stretch ratio use reference above

225x.35 = 78.75/9.5 = 8.2 ratio lower the ratio more stretch angle
255x.3 = 76.5/10 = 7.65 rato

you can clearly see the difference with the stretch between 8.2 vs 7.65 above

now just plug in your numbers

245x.35=85.75/9.5 = 9.0 pending on the tire brand ratio around 9 and up it will start to square up... so the stretch is VERY minimal.

275x.3=82.5/11 = 7.5

so just by looking at the 7.5 and the 9 i know the stretch will not look the same once mounted. if this is a concern to you...then you can change it up for aesthetic reasons. if not just run it as is.
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      06-12-2014, 10:24 AM   #19
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Quote:
Originally Posted by #Tee View Post
oh if youre on an e90 youre safe, ya its just the angle of the shots the front bumper curves down and in alot so the poke is exaggerated. the 245.35 is a very minimal. try this formula ...i posted this a few times

you can imagin a stretch ratio use reference above

225x.35 = 78.75/9.5 = 8.2 ratio lower the ratio more stretch angle
255x.3 = 76.5/10 = 7.65 rato

you can clearly see the difference with the stretch between 8.2 vs 7.65 above

now just plug in your numbers

245x.35=85.75/9.5 = 9.0 pending on the tire brand ratio around 9 and up it will start to square up... so the stretch is VERY minimal.

275x.3=82.5/11 = 7.5

so just by looking at the 7.5 and the 9 i know the stretch will not look the same once mounted. if this is a concern to you...then you can change it up for aesthetic reasons. if not just run it as is.
Yeah I know I should have went with a 235 up front but I got new tires not too long ago. I'll probably go up to a 285 in the rear later on. Thanks for all the info.

Monacobluee90 do you have some pictures of 9.5et22 up front?
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      06-12-2014, 12:45 PM   #20
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Monacobluee90 do you have some pictures of 9.5et22 up front?
Yeah only these two currently, tho. Camber is -1 degrees.





By the way 19x9.5 et25 with 245/35/19 http://www.e90post.com/forums/showthread.php?t=877645
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      06-12-2014, 03:50 PM   #21
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Yeah only these two currently, tho. Camber is -1 degrees.





By the way 19x9.5 et25 with 245/35/19 http://www.e90post.com/forums/showthread.php?t=877645
How much does your front wheel poke from the top of the fender? About 5-6mm?
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      06-12-2014, 03:58 PM   #22
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sorry late on this guys, youll be perfectly fine with the 9.5 +27. theres plenty of inside gap...the bc body flares out at the body about 3mm (more than other coils). so at those specs theres at least 3mm gap.

youll be poking 4mm with the -.65 so adding another .75 youll be tucking at least 5mm. at this point you can just use the camber to control the poke but maximum poke would be 4mm (top of fender to rim). just be careful on the drive height cause the front stretch is very minimal. youre really pushing the limits of being functional flush with some meat on the tires + aesthetically pleasing flush/poke.
Hey tee, can you confirm the 10mm of change per degree of camber? Based on my calculations the total change is 10-12mm so the top goes in 5mm and bottom goes out 5mm.

I did this by drawing a triangle and using the angles to calculate the length of each side and based on this 1 degree of camber pushed the top of the triangle out about 5.33mm.
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