BC coilovers with custom spring rates

Postby **NitroDann** » Tue Feb 04, 2014 2:40 pm

6/5 only feels good at under 7/10ths because it makes the car feel more lively. Anything past 7/10ths and the car is uncomfortably tail happy. I have one here just like it and with stock na6 power its a full on D1 car in 1st and 2nd gear.

Dann

plohl · Postby **plohl** » Tue Feb 04, 2014 3:25 pm

What wheel rates are people actually aiming for?

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Postby **NitroDann** » Tue Feb 04, 2014 4:05 pm

50% stiffer front spring than rear on stock arms with sensible ride height (>/=10cm to the pinch welds) and with swaybars that match each other.

Dann

plohl · Postby **plohl** » Tue Feb 04, 2014 5:31 pm

That didn't answer the question...

Postby **NitroDann** » Tue Feb 04, 2014 6:35 pm

Your question was WAY too vague to answer properly.

Dann

sailaholic · Postby **sailaholic** » Tue Feb 04, 2014 7:11 pm

Lol..... Goes to get popcorn.

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project.r.racing · Postby **project.r.racing** » Tue Feb 04, 2014 7:45 pm

6/5 combo. fulla sik driftio yo!

BitRusty · Postby **BitRusty** » Tue Feb 04, 2014 8:50 pm

My 1st set (of 4) of BCs were 6/5. Didn't last too long. Was horrible imo. Went to 8/6 on those which was so much better (SE daily). Next 3 sets of br type have been 8/6 & 10/7 with aero on nb track car with whiteline adjustable bars. 8/6 would be my pick for a daily with track time. BC valve them to suit the rates you order giving you 2kg of spring play before revalving is needed. Custom orders come straight from the factory. Very quickly too I might add

Call the guys at MX5 Plus for more details

Cheers
Matt

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OurCognitiveSurplus · Postby **OurCognitiveSurplus** » Wed Feb 05, 2014 8:37 am

I spent a lot of time looking for a product that would come from factory with the '50% stiffer fronts (i.e. 6/4). Lots of stuff comes with ratios that my reading, like your, suggested wasn't quite right (like yellowspeeds 8/6 or 12/12).

Anyway, I ended up just getting a 7/4 setup, and I have had no issues with it (stock sways and reguarl width tyres).

Postby **NitroDann** » Wed Feb 05, 2014 9:37 am

Its not about having issues its about balance at the limit. Getting it wrong by more than a few percent leaves you with a car which isnt neutral.

Dann

OurCognitiveSurplus · Postby **OurCognitiveSurplus** » Wed Feb 05, 2014 11:03 am

NitroDann wrote:Its not about having issues its about balance at the limit. Getting it wrong by more than a few percent leaves you with a car which isnt neutral.

Dann

I would call being unbalanced at the limit an issue.

kazama · Postby **kazama** » Wed Feb 05, 2014 11:07 am

BitRusty wrote:My 1st set (of 4) of BCs were 6/5. Didn't last too long. Was horrible imo. Went to 8/6 on those which was so much better (SE daily). Next 3 sets of br type have been 8/6 & 10/7 with aero on nb track car with whiteline adjustable bars. 8/6 would be my pick for a daily with track time. BC valve them to suit the rates you order giving you 2kg of spring play before revalving is needed. Custom orders come straight from the factory. Very quickly too I might add

Call the guys at MX5 Plus for more details

Cheers
Matt

good info. will definitely keep in mind

NitroDann wrote:Its not about having issues its about balance at the limit. Getting it wrong by more than a few percent leaves you with a car which isnt neutral.

Dann

most of the off the shelf setups dont run 50% stiffer front than rear. 949 racings kits for example.
and when sway bars, diffs and alignments get involved it opens another can of worms. fat cats link is a pretty cool reference
http://www.fatcatmotorsports.com/FRC_TU ... TORIAL.htm

out of curiosity what suspension setup would one recommend for VERY enthusiastic street use, assuming a fairly relaxed 195/50 tyre like the re002 is used? and how would that change if the tyre was a direzza star spec?

no "tyres, alignment and learn to drive" comments please :lol:

Postby **NitroDann** » Wed Feb 05, 2014 11:18 am

just 50% stiffer.

Most low end stuff is suited for slowish street driving where the added turn in from an unstable rear end makes the car feel alive.

Most high end stuff is suited for no rear bar or a very front heavy bar setup, for various reasons including the limited rear bump travel.

If you want to use a low end setup on an otherwise stock car (with the same tyres front and rear, regardless of compound), and you want to drive it on the limit (Hint: If the car isnt sliding you aren't on it) you need 50% more front spring than rear.

Dann