Coil Spring Specialties

[1qckser]

Has anyone ever dealt with this company? They will custom make springs to your specs, $225 front, $192 rear for the Q, If Tech would put in some input maybe we could have the ultimate spring for the Q designed to his specs, What do you think Dennis? any specs we could give these guys, anything you would like to see in a coil spring for the Q?

[1qckser]

http://www.coilsprings.com/

[maxnix]

Yep, stock ride height and 15% - 20% stiffer. I am there if they are like that.

[1qckser]

If thats what you want then they will do it, I waiting for Q45Tech to add his thoughts on this one.

[Q45tech]

AGREED: "stock ride height and 15% - 20% stiffer. I am there if they are like that" in a purely linear front spring 146 > 175lb/in.......so that the pitch ratio is optimized for say 73-75 mph instead of 60 mph.

Rear 123>147 lb/in.

12mm wire diameter x 110mm diameter x free length 429mm

11.5 x Wire Diameter to the fourth power (D4) ÷ by 8 x Number of Active Coils x Mean Diameter cubed.

http://www.efunda.com/designst...y.cfmt ... st...r.cfm

Spring constant, k: 146 lbf/in Maximum load possible, Fmax: 1770 lbf Maximum shear stress possible, tmax: 198 ksi Maximum displacement possible, Ldef: 12.1 in Length of wire required to make spring: 124 in Solid height: 4.75 in Distance between coils in free spring: 2.09 in Rise angle of coils: 9.76 deg Lowest spring resonant frequency, fres: 49.2 Hz Shear modulus of material, G: 76.9 GPa Mass of spring: 2.64 kg

[Q45tech]

http://www.kabseating.com.au/o...e.asph ... eports.htm

Now to real get deep.http://www.ee.ic.ac.uk/CAP/Rep...p.pdf

[maxnix]

Thank you Dennis!__________________Brian1995 Q45 & Q45t & 2000 Q45

Discover the power of the button!

[Mayhem_J30]

I have had them make springs for me before for the J30. I only did the 20% rate increase. They are linear and not progressive. The springs fit perfectly.What Dennis gave you is probably all they need. I provided similar info but they still needed a sample coil from the front and rear. I'm guessing this is to get the fitment right.

[Q45tech]

Any stiffer than 20% means you have to have shocks made to control the spring.

These won't be cheap like $1,000 each.......if you could offer Tokico a 100 unit volume cash up front they might do it.........pretty unrealistic.

Beyond that a "complete coil over" and new top seats would be the way to go..........more engineering required but under $4,000.

[Mayhem_J30]

LIke Q45tech said 20% seems to be the magic number with increasing the spring and keeping the OEM dampers. I guess you could expect them to wear out 20% quicker too.I think someone on NICO had KONI do some custom work on adjusteable struts. Wasn't cheap. Probably in the ballpark Dennis mentioned.