Intro: BC Racing Coilovers brought to you by Darkside Engineering - Page 4 - LotusTalk - The Lotus Cars Community
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post #61 of 71 (permalink) Old 09-25-2011, 06:48 PM
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I have the BC coilovers on my 06 Elise - They seem well-built and I have enjoyed the improved handling and damping they provide without high cost.
The limitation which may be common to other coilovers is the height adjustment - We basically had to top out the rear setting and bottom out the front to get the ride heights we were looking for favoring the rear height +8mm over the front as some suggest. (I am no suspension expert.) I was able to string align the car after V2 arms and RTV brace installs with driver ballast no problem but I have not attempted corner balancing with these yet where height adjustments will be needed. The car drives and handles great at this point for autocross - (not used on track yet since install) - The guys at Darkside Engineering did the installation and did a great job. - They took measurements to send back to BC Racing for the Elise specifically to address ride height adjustability at the factory to see if improvement is possible. I did not follow up yet to see if BC was going to change anything but Darkside said they would switch mine out no charge if a new model arrives!
/http://www.darksideengineering.com/products/suspension/coilovers/bc-racing-coilovers-br-series
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Ardent Red, Touring BOE REV 300/Surge Tank/CC/TOC pan, FF exhaust/damper, light fly/hd clutch, snorkel delete/ITG filter, CL RC5+ pads/Ultradiscs, FOB range improved, BWR key, micromirror/visor delete, HIDs, TR Motorsport F1/R888s, Schroth 6pt/sys.6.pk/V Force bar/R3 Rage, shift mod, 6lb Braille, extinguisher, V2 arms, BC Racing SA coilovers, RTV Brace
DD: 2012 Ice Silver Audi A4 quattro tiptronic
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post #62 of 71 (permalink) Old 09-26-2011, 12:07 AM
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Hi Ratnam,
*
The following is the spring spec for your lotus elise.
*
front maximum length 180mm
rear maximum length 220mm
Both top and bottom inner diameter of the spring is 50mm.
*
We are sorry to tell you*that you will have to*look for*the spring*yourself according to above information to fit your vehicle.
*
Best regards,
*
Dean Chou
International Sales Rep.
Taiwan Bor-Chuann Enterprise Co., Ltd.
http://www.bcec.com.tw*********Email: [email protected]
Tel: 886-4-23399693 ext*30********Fax: 886-4-23399193
No.10, Wukung 6th Rd., Wufong Dist., Taichung City 413, Taiwan R.O.C.
----- Original Message -----
From: ratnam junior
To: [email protected]
Sent: Monday, September 19, 2011 3:11 PM
Subject: RE: Lotus Elise bc suspension spring upgrade

Hi dean,

Can it be special order or if there is any other brand which can be fitted?

The dampers are very nice on the street,but for track it's to soft.I am currently running the hardest rate now.(30 click)

It will be a pity if I have to look for other dampers instead.

From: [email protected]
To: [email protected]
Subject: Re: Lotus Elise bc suspension spring upgrade
Date: Mon, 19 Sep 2011 10:13:43 +0800

Hi Ratnam,
*
The springs for lotus elise are special specs.
*
We are sorry to tell you that only 7kg front and 8kg rear spring rate is available for lotus elise.
*
Best regards,
*
Dean Chou
International Sales Rep.
Taiwan Bor-Chuann Enterprise Co., Ltd.
http://www.bcec.com.tw*********Email: [email protected]
Tel: 886-4-23399693 ext*30********Fax: 886-4-23399193
No.10, Wukung 6th Rd., Wufong Dist., Taichung City 413, Taiwan R.O.C.
----- Original Message -----
From: ratnam junior
To: [email protected]
Sent: Sunday, September 18, 2011 2:41 PM
Subject: Lotus Elise bc suspension spring upgrade

Hi I currently have the bc damper for the lotus Elise.

It came with the 7kg front and 8kg rear spring rate.

Do you have a upgrade spring for the lotus Elise?

I am looking at front 10kg rear 12kg thanks alot.
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post #63 of 71 (permalink) Old 09-26-2011, 12:15 AM
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I believe good things dun come cheap.if for daily drive they are quite comfortable able to take the bumps.but if you track the car I believe they are not up there yet.if they were to have higher rating spring or release the er series for the Elise then it may be a diff story.
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post #64 of 71 (permalink) Old 09-26-2011, 06:12 PM
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I believe my BC coilover spring rates may be what you are looking for danjunior if my guess is correct....

The middle number printed on my rear spring is 220 and the front spring is 180. If this represents pounds per inch (edit: should be Kg/mm, not lb/in) compression then if you divide these numbers by a conversion factor of 0.0179 to get lb/in of 12k rear and 10k front which is what you may be looking for. You might want to contact Darkside Engineering to confirm this.... They also do custom springs for alot of Subaru/Nissan/Evo cars.

Hope this helps!
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--------------------------------------------
Ardent Red, Touring BOE REV 300/Surge Tank/CC/TOC pan, FF exhaust/damper, light fly/hd clutch, snorkel delete/ITG filter, CL RC5+ pads/Ultradiscs, FOB range improved, BWR key, micromirror/visor delete, HIDs, TR Motorsport F1/R888s, Schroth 6pt/sys.6.pk/V Force bar/R3 Rage, shift mod, 6lb Braille, extinguisher, V2 arms, BC Racing SA coilovers, RTV Brace
DD: 2012 Ice Silver Audi A4 quattro tiptronic

Last edited by JRzCarz; 09-27-2011 at 06:59 PM. Reason: incorrect units of measure
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post #65 of 71 (permalink) Old 09-26-2011, 08:52 PM
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Quote:
Originally Posted by JRzCarz View Post
The middle number printed on my rear spring is 220 and the front spring is 180. If this represents pounds per inch compression then if you divide these numbers by a conversion factor of 0.0179 to get kg/mm of 12k rear and 10k front which is what you may be looking for.

Hope this helps!
I believe that you have got the conversion backwards .... to convert lb/in to kg/mm, you multiply by 0.0179: to convert kg/mm to lb/in, you divide by 0.0179.

The numbers would look like this:

180 lb/in = ~ 3.2K
220 lb/in = ~ 3.9K

10K= ~558.6 lb/in
12K= ~670.4 lb/in

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post #66 of 71 (permalink) Old 09-26-2011, 10:00 PM
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Oops again... You are right Jack but I found out that the number on my spring represents Kg/mm based on the linked product chart, (not lb/in as I previously assumed)

http://www.bcracing-na.com/downloads...ATION_LIST.pdf

Feel free to help my math for 180 kg/mm front and 220 kg/mm rear... divide by 0.0179... 10,056 lb/in front and 12,290 lb/in rear. Seems WAY stiff when others

talk about spring rates of of 400 - 800.... what units do those numbers represent?? Confusing...

--------------------------------------------
Ardent Red, Touring BOE REV 300/Surge Tank/CC/TOC pan, FF exhaust/damper, light fly/hd clutch, snorkel delete/ITG filter, CL RC5+ pads/Ultradiscs, FOB range improved, BWR key, micromirror/visor delete, HIDs, TR Motorsport F1/R888s, Schroth 6pt/sys.6.pk/V Force bar/R3 Rage, shift mod, 6lb Braille, extinguisher, V2 arms, BC Racing SA coilovers, RTV Brace
DD: 2012 Ice Silver Audi A4 quattro tiptronic

Last edited by JRzCarz; 09-27-2011 at 06:45 PM. Reason: incorrect units for spring rate number
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post #67 of 71 (permalink) Old 09-27-2011, 07:02 PM
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bump for help on spring rate conversion...

--------------------------------------------
Ardent Red, Touring BOE REV 300/Surge Tank/CC/TOC pan, FF exhaust/damper, light fly/hd clutch, snorkel delete/ITG filter, CL RC5+ pads/Ultradiscs, FOB range improved, BWR key, micromirror/visor delete, HIDs, TR Motorsport F1/R888s, Schroth 6pt/sys.6.pk/V Force bar/R3 Rage, shift mod, 6lb Braille, extinguisher, V2 arms, BC Racing SA coilovers, RTV Brace
DD: 2012 Ice Silver Audi A4 quattro tiptronic
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post #68 of 71 (permalink) Old 02-14-2012, 06:12 PM
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Quote:
Originally Posted by JRzCarz View Post
bump for help on spring rate conversion...
pretty sure you are reading the wrong number on the spring for the rate. the rate looks like the last number which is 8k (450 lbs/in), the standard rate for the rear mentioned in the sales rep email above. 220 is probably the length and 50 is probably the inner diameter in mm. according to the sales rep email, the fronts only come in 7k so you could look at the number on your front springs to confirm this.
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post #69 of 71 (permalink) Old 02-14-2012, 06:43 PM
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J-Man, you are right! The front has last number 007 (7k) and as you stated from the rep email the front max length is 180 and 220 for the rear.

Thanks for helping me sort the numbers out!

--------------------------------------------
Ardent Red, Touring BOE REV 300/Surge Tank/CC/TOC pan, FF exhaust/damper, light fly/hd clutch, snorkel delete/ITG filter, CL RC5+ pads/Ultradiscs, FOB range improved, BWR key, micromirror/visor delete, HIDs, TR Motorsport F1/R888s, Schroth 6pt/sys.6.pk/V Force bar/R3 Rage, shift mod, 6lb Braille, extinguisher, V2 arms, BC Racing SA coilovers, RTV Brace
DD: 2012 Ice Silver Audi A4 quattro tiptronic
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post #70 of 71 (permalink) Old 02-14-2012, 06:57 PM
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Quote:
Originally Posted by Rondo Fondu View Post
Here is some comparision info:

Lotus Stnd
front rate = 242 lbs weight = 5.65 lbs
rear rate = 342 lbs weight = 6.25 lbs

Lotus Sport
front rate = 271 lbs weight = 5.65 lbs
rear rate = 371 lbs weight = 6.25 lbs

Lotus Track Pack
front rate = 180 > 271 lbs (variable rate vs load) weight = ???
rear rate = 260 > 371 lbs (variable rate vs load) weight = ???

BC/Darkside Racing Single Adjustable
front rate = 279 lbs weight = ???
rear rate = 391 lbs weight = ???
(purchaser specifed rates availible at no extra cost)

Nitron Sport Pro Single Adjustable (w Sector 111 spring rates)
front rate = 525 lbs weight = 4.6 lbs
rear rate = 650 lbs weight = 5.5 lbs

Nitron Sport Pro Single Adjustable (w Elise Parts spring rates)
front rate = 325 lbs weight = 4.6 lbs
rear rate = 400 lbs weight = 5.5 lbs


Nitron Track Double Adjustable
front rate = 475 lbs weight = 6.4 lbs (with remote reservoirs)
rear rate = 600 lbs weight = 8.05 lbs (with remote reservoirs)

Ohlin Track Double Adjustable
front rate = 326 lbs weight = 5.0 lbs (with remote reservoirs)
rear rate = 423 lbs weight = 6.95 lbs (with remote reservoirs)

BWR/Penske
front rate = 350 lbs weight = ???
rear rate = 500 lbs weight = ???

If anybody has the weight for the sets that I'm missing I'll include them in the info above.
BC/Darkside Racing Single Adjustable
front rate = 279 lbs weight = 5.4 lbs
rear rate = 391 lbs weight = 6.7 lbs

--------------------------------------------
Ardent Red, Touring BOE REV 300/Surge Tank/CC/TOC pan, FF exhaust/damper, light fly/hd clutch, snorkel delete/ITG filter, CL RC5+ pads/Ultradiscs, FOB range improved, BWR key, micromirror/visor delete, HIDs, TR Motorsport F1/R888s, Schroth 6pt/sys.6.pk/V Force bar/R3 Rage, shift mod, 6lb Braille, extinguisher, V2 arms, BC Racing SA coilovers, RTV Brace
DD: 2012 Ice Silver Audi A4 quattro tiptronic
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post #71 of 71 (permalink) Old 02-16-2012, 01:13 PM
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Quote:
Originally Posted by JRzCarz View Post
BC/Darkside Racing Single Adjustable
front rate = 279 lbs weight = 5.4 lbs
rear rate = 391 lbs weight = 6.7 lbs
The conversion for 7kg/mm and 8kg/mm would be approx 393lb/in and 450lb/in
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