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How Do I Tell What My Spring Rates Are?

Sydneykid
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toolman700 Newbie

toolman700

Posted
Posted

hi,

sorry if i am posting at the wrong place but i tried searching for the the correct topic but cant seem to find it (maybe using the wrong keywords).

i just bought a 1991 r32 gts, it has a set of D2 coilovers which are way too hard for my liking. The springs also seem short as i can't seem to wind it up to increase ride height.

my question is what are the best spring rates for normal street use and secondly; are there different heights for coilover springs?

Thanks in advance

Rizal

  • 1 month later...
sun33 Community Regular

sun33

Posted
Posted (edited)

hi Sydney kid

Do mind doing these for me.

l expext them to be pretty hard, my butt can vouch for it.

Front Coil ID: 70mm

Wire Dia: 12mm

# of Coils: 8.5

can you let me know kg/mm please mate...and i'll send you pics of the rear when i get them off the car,or any one eles can do it for me plssssss

cheers mate..

Edited by sun33
  • 1 month later...
yld34t Collaborator

yld34t

Posted
Posted

Hi SK,

Can you please work out these spring rates?

Front:

Coil OD= 90mm top and bottom

Wire OD= 13mm

# of coils= 8.125 turns

Rear:

Coil OD= 90mm top and bottom

Wire OD= 13mm

# of coils= 9 turns

Thanks!

  • 4 weeks later...
champcarman Enthusiast

champcarman

Posted
Posted

I have an R34 GTT with Apexi coilovers, I don't know what the spring rates are but I know it is a bit too hard riding.

What i want to know is the best place, preferably in Eastern Melbourne suburbs, to have this looked at and hopefully get recommendations and possibly alternate springs made up.

  • 2 weeks later...
  • 1 month later...
Sydneykid Grand Master

Sydneykid

Posted
  • Author
Posted
ID Both: 1.24100" (in) = 31.5214 MM

OD of Wire: .194" (in) = 4.9276 MM

# of coils: 31.3 turns

I would really appreciate it!!!!!!!!!!

THANKS!!!

Alex

Motorcycle spring, 25 lbs/inch

Cheers

Gary

Sydneykid Grand Master

Sydneykid

Posted
  • Author
Posted
I have an R34 GTT with Apexi coilovers, I don't know what the spring rates are but I know it is a bit too hard riding.

What i want to know is the best place, preferably in Eastern Melbourne suburbs, to have this looked at and hopefully get recommendations and possibly alternate springs made up.

Centeline

Cheers

Gary

Sydneykid Grand Master

Sydneykid

Posted
  • Author
Posted
Hi SK,

Can you please work out these spring rates?

Front:

Coil OD= 90mm top and bottom

Wire OD= 13mm

# of coils= 8.125 turns

230 lbs/inch (4.1 kg/mm)

Rear:

Coil OD= 90mm top and bottom

Wire OD= 13mm

# of coils= 9 turns

200 lbs/inch (3.6 kg/mm)

Thanks!

Cheers

Gary

Sydneykid Grand Master

Sydneykid

Posted
  • Author
Posted
hi Sydney kid

Do mind doing these for me.

l expext them to be pretty hard, my butt can vouch for it.

Front Coil ID: 70mm

Wire Dia: 12mm

# of Coils: 8.5

can you let me know kg/mm please mate...and i'll send you pics of the rear when i get them off the car,or any one eles can do it for me plssssss

cheers mate..

315 lbs/inch (5.6 kg/mm)

Cheers

Gary

Sydneykid Grand Master

Sydneykid

Posted
  • Author
Posted
hi,

sorry if i am posting at the wrong place but i tried searching for the the correct topic but cant seem to find it (maybe using the wrong keywords).

i just bought a 1991 r32 gts, it has a set of D2 coilovers which are way too hard for my liking. The springs also seem short as i can't seem to wind it up to increase ride height.

my question is what are the best spring rates for normal street use and secondly;

The standard ones, 165 lbs/inch (3kg/mm), Nissan didn't get it that wrong. If upgrading then nothing over 330 lbs /inch (6 kg/mm) in the front and 225 lbs/inch (4 kg/mm) in the rear.

If that gives too much roll for your liking then upgrade the swaybars, 27 mm front and 24 mm rear.

are there different heights for coilover springs?

Yes, heaps, all you need to know is the ID, the rate and and the current free height. Then order accordingly.

Thanks in advance

Rizal

Cheers

Gary

Sydneykid Grand Master

Sydneykid

Posted
  • Author
Posted
these are off a set of Koni coilovers...

F

Coil ID = 64mm

Wire OD = 10 mm

# of Coils = 6.5 turns

300 lbs /inch (5.5 kg/mm)

R

Coil ID = 64mm

Wire OD = 10 mm

# of Coils = 7.1 turns

265 lbs /inch (4.7 kg/mm)

Thanks SK!

Nice rates

Cheers

Gary

Sydneykid Grand Master

Sydneykid

Posted
  • Author
Posted
Hi SK could you please calculate some spring rates for me.

FRONT:

Coil ID = 99 top / 68 bottom (mm)

Wire OD = 12.7 mm

# of Coils = 7.5 turns

275 lbs /inch (4.9 kg/mm)

REAR:

Coil ID = 88.5 top / 77.5 bottom (mm)

Wire OD = 12 mm

# of Coils = 11 turns

140 lbs /inch (2.5 kg/mm)

With 11 turns it's most likely a progressive spring, give me the coil spacing and I can work out the high rate as well (140 is the low rate).

thanks, Tim.

Cheers

Gary

Sydneykid Grand Master

Sydneykid

Posted
  • Author
Posted
Hey Gary can you please work your magic formula over these,

Rear

OD:- 92mm

Coils :- 8.2 turns

Springs Diameter :- 12.9mm

220 lbs /inch (3.9 kg/mm)

Front

OD :- 95mm

Coils :- 10.1 turns

Spring diameter :- 14.3mm

215 lbs /inch (3.8 kg/mm)

Thanks in advance

??????????

Cheers

Gary

Sydneykid Grand Master

Sydneykid

Posted
  • Author
Posted
Thanks in advance for the calculation SK,

My front one are

Coil ID = 70 mm

Wire OD = 13 mm

# of Coils = 9.5 turns

360 lbs /inch (6.4 kg/mm)

and the rear are

Coil ID = 59 mm

Wire OD = 12 mm

# of Coils = 12 turns

300 lbs /inch (5.4 kg/mm)

Cheers

Gary

Sydneykid Grand Master

Sydneykid

Posted
  • Author
Posted
Hi SK

Can you help calculate my spring rates please. HKS coilovers for S13. Hypermax D. I'm guessing pretty stiff :)

Not sure what to measure when it comes to the Coil OD's as I have progressive springs. So attached pic for your assistance.

Fronts:

Coil OD lowest coil 82mm/very top coil 82mm. Widest part of OD is the middle of the top 5 coils and that measures 95mm. 5 coils at top close sprung.

Wire OD = 11mm

# of coils = 10.5

Spring Rate =

Low rate 115 lbs /inch (2.0 kg/mm)

High rate 285 lbs /inch (5.1 kg/mm)

Rears:

Coil OD lowest coil 87mm/very top coil 87mm. Widest part of OD is the middle of the top 5 coils and that measures 95mm. 5 coils at top close sprung

Wire OD = 11mm

# of coils = 10.125

Spring Rate =

Low rate 100 lbs /inch (1.8 kg/mm)

High rate 260 lbs /inch (4.6 kg/mm)

Thanks :banana:

Sam

With those low low rates it would always be running around on the high spring rates, the extra coils are just there to soak up space (keep the coils trapped at full droop).

Cheers

Gary

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