BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

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      07-06-2015, 12:05 PM   #23
dcaron9999
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Quote:
Originally Posted by 02rsxpilot View Post
I talked to TC personally a while back and asked him about spring rates. His first question was if I'd addressed the RSFB, and when I said I had done the inserts, he said without hesitation 350 front, 600 rear.
Good to know. My B8 dampers probably have "inferior" damping specs to TCK SA or DA, but the spring rates you provided offer a ballpark to aim for at least. If Swift and Bilstein support ever respond to my email, I will post their replies here...
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      07-06-2015, 01:48 PM   #24
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Quote:
Originally Posted by dcaron9999 View Post
Good to know. My B8 dampers probably have "inferior" damping specs to TCK SA or DA, but the spring rates you provided offer a ballpark to aim for at least. If Swift and Bilstein support ever respond to my email, I will post their replies here...
I did speak to swift usa about the custom spring option. They would need exact number of coils and the rate and length info. So basically we would not be sure of the drop without testing. If someone has a way to model the approx drop with three parameters then swifts can be ordered.

For the rear we can order it a bit short since with the HPA rear height adjusters we can get away with a max 2.75' of adjustments. For the fronts its going to be a PITA.
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      07-07-2015, 06:26 AM   #25
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Quote:
Originally Posted by dcaron9999 View Post
Good to know. My B8 dampers probably have "inferior" damping specs to TCK SA or DA, but the spring rates you provided offer a ballpark to aim for at least. If Swift and Bilstein support ever respond to my email, I will post their replies here...
I found Bilstein support to be rather challenging at the best of times. I got the spring rates from the TUV thing (their guidance), anything further I was referred to my local distributor.
Best of luck!
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      07-07-2015, 09:46 AM   #26
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I received nothing from Bilstein support yet, but here's the response from Swift ...

"We do make custom springs but then in order for us to make the custom spring we would need exact specs (length, rate, coil count) in order to make it.

We will not be able to make a custom spring based off of what you expect the outcome of the vehicle to sit.

If you can get all that data then we will be able to make the spring in about 40 days."
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      07-07-2015, 10:22 AM   #27
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I think someone relatively well versed in car suspension geometry and design could help with that. Maybe pick fe1rx brain. The man seems to have a lot of our cars suspension down pretty well.
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      07-07-2015, 01:49 PM   #28
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Quote:
Originally Posted by dtla1 View Post
I think someone relatively well versed in car suspension geometry and design could help with that. Maybe pick fe1rx brain. The man seems to have a lot of our cars suspension down pretty well.
Labelling our resident fe1rx as "relatively well versed" is an under statement. This guy rocks! Helped me on several suspension issues and inquiries Ive asked him about in the past. He has some mechanical engineering background. He happens to put his 1-series through its paces at the track too.

I have not engaged him for this topic yet. Maybe I will afte I get all my responses back from Swift + Bilstein ...
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      07-07-2015, 02:56 PM   #29
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Quote:
Originally Posted by dcaron9999 View Post
Labelling our resident fe1rx as "relatively well versed" is an under statement. This guy rocks! Helped me on several suspension issues and inquiries Ive asked him about in the past. He has some mechanical engineering background. He happens to put his 1-series through its paces at the track too.

I have not engaged him for this topic yet. Maybe I will afte I get all my responses back from Swift + Bilstein ...
I was trying not to rub his ego too much. The guy is awesome. I had a bunch of mechanical engineering friends in college and myself being a civil engineering, we spent a lot of time in labs at school messing around and gathering data about a lot of different car components, mostly things we were working on for ourselves. Never actually put together any reports as nice as fe1rx has done though.
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      07-07-2015, 04:33 PM   #30
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Quote:
Originally Posted by dtla1 View Post
I was trying not to rub his ego too much. The guy is awesome. I had a bunch of mechanical engineering friends in college and myself being a civil engineering, we spent a lot of time in labs at school messing around and gathering data about a lot of different car components, mostly things we were working on for ourselves. Never actually put together any reports as nice as fe1rx has done though.
+1 the guys a real asset to the forums. Maybe he will come up with something akin to a working computer model to predict drop and come up with spring specs.
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      07-07-2015, 06:46 PM   #31
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Simple excel spread sheet will do. Will need to know various dimensions including weight on that spring (% would be fine) and maybe the total dynamic loading that area will see. I think fe1rx already has tested and verified the spring rate of a tire so that variable can be taken out. Coil count may just be a feeler time variable based on what other manufacturers have already but its essential to prevent coil bind. Over than that, plug it into an excel spread sheet and you should be able to extrapolate the variables Swift is looking for.

You can try giving these guys a call also... http://www.coilsprings.com/sports_cars.aspx
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      07-08-2015, 04:19 AM   #32
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Quote:
Originally Posted by dcaron9999 View Post
I received nothing from Bilstein support yet, but here's the response from Swift ...

"We do make custom springs but then in order for us to make the custom spring we would need exact specs (length, rate, coil count) in order to make it.

We will not be able to make a custom spring based off of what you expect the outcome of the vehicle to sit.

If you can get all that data then we will be able to make the spring in about 40 days."
I gotta ask- how does this compare to using a standard size spring?
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      07-09-2015, 12:37 PM   #33
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Response back from Bilstein support:

"We can confirm that the B8 valving will accommodate modest spring rate increases. 50-100lbs per corner should be ok. Thanks.

If he's referring to stock BMW spring rates, then the Spec-R is as much rate as I can use. I will confirm with them ...

BMW M sport = 120/350 lbs/in.
Swift Spec-R springs = 201/503 lbs/in.
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Last edited by dcaron9999; 07-10-2015 at 09:08 AM..
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      08-02-2015, 12:55 AM   #34
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Just noticed on mod barg*ains site they have this little chart.
In case you did find that we could run higher spring rates with the B8s, would it make sense to run the 335i springs? I wonder if the drop maybe wouldn't be as much as the 135i designed springs.
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      08-05-2015, 10:26 PM   #35
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I wouldn't put too much effort into comparing spring rates across different cars. The distance of the spring from some particular pivot point, the length of an arm acting on it, the geometry of the various links, etc. all factor in. 200lbf/in on car A coould be "equivalent" to 150lbf/in on car B. Comparing across the various 1-Series springs is great, but looking at 3-series is a bit apples / oranges.

Unless of course you are dead certain they are identical, then you may have something. But if they aren't identical...
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      08-06-2015, 11:39 AM   #36
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Only reason I compared is because they have pretty much the same everything. After market coilover kits, and strut/dampener kits, swaybars, they are all billed as for e82 OR e90. Maybe Harold from HP Autosport can provide some insight?
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      08-06-2015, 11:59 AM   #37
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Depending on what you are doing with the car, dampers and other suspension mods, the rates can vary. Are you going to feel a 100 lb increase in rear spring rates? Likely not, at least not to the 99% of us, especially with all the rubber bushings in place.
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      08-06-2015, 12:02 PM   #38
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Quote:
Originally Posted by HP Autosport View Post
Depending on what you are doing with the car, dampers and other suspension mods, the rates can vary. Are you going to feel a 100 lb increase in rear spring rates? Likely not, at least not to the 99% of us, especially with all the rubber bushings in place.
The OP of this thread is already running Swift springs, he is looking to double or so the front rate without coilovers.
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      08-06-2015, 01:19 PM   #39
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Quote:
Originally Posted by MightyMouseTech View Post
The OP of this thread is already running Swift springs, he is looking to double or so the front rate without coilovers.
Then he will need to do a coilover type conversion with a sleeve kit. The rear will also need to go up a bit.
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      08-07-2015, 12:21 AM   #40
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Quote:
Originally Posted by HP Autosport
Quote:
Originally Posted by MightyMouseTech View Post
The OP of this thread is already running Swift springs, he is looking to double or so the front rate without coilovers.
Then he will need to do a coilover type conversion with a sleeve kit. The rear will also need to go up a bit.
Best way to get ahold of Bilstein support is via Facebook haha I wrote on their corporate wall that I couldn't find an install pdf and got a link in 2hrs. I imagine the most Web literate people in bilstein corporate are the teenage interns manning their Facebook account.
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      08-07-2015, 12:23 AM   #41
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Quote:
Originally Posted by HP Autosport
Quote:
Originally Posted by MightyMouseTech View Post
The OP of this thread is already running Swift springs, he is looking to double or so the front rate without coilovers.
Then he will need to do a coilover type conversion with a sleeve kit. The rear will also need to go up a bit.
Btw Harold, I'm interested in a custom swift setup for my pss9. At minimum the fronts and maybe the rears too. Can you email me at Spencerakimball@gmail
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      08-07-2015, 11:19 AM   #42
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Btw Harold, I'm interested in a custom swift setup for my pss9. At minimum the fronts and maybe the rears too. Can you email me at Spencerakimball@gmail
Email sent!
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      08-09-2015, 03:39 AM   #43
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Originally Posted by spxxx View Post
Btw Harold, I'm interested in a custom swift setup for my pss9. At minimum the fronts and maybe the rears too. Can you email me at Spencerakimball@gmail

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Originally Posted by HP Autosport View Post
Email sent!

Harold supplied the springs and camber plates for my pss. 7" front length ended up being required- treat it the same as the Ohlins, but with 60mm springs.
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      08-09-2015, 05:51 PM   #44
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Email sent!
Didn't get your email.

Spencerakimball@gmail.com
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