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How Do I Tell What My Spring Rates Are?

Sydneykid
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Sydneykid Grand Master

Sydneykid

Posted
  • Author
Posted

Sorry for the brief answers, this thread is for guys to measure their springs and for me to calculate the rates, please post any follow up questions in the general suspension thread and I will answer them or PM me if you want.

does the spring rate have to suit the car for eg, i have a r33 gtst

Yes

what is the rate on stock springs?

~165 lbs/inch (3 kg/mm)

what would i be looking to get if i were to get coilovers?

Depends on;

1. what you use the car for

2. what tyres (normal road tyres, R type track tyres or full slicks)

3. what antiroll rates (stabiliser bars)

4. what dampers rates (in the shocks)

5. the suspesnion geometry (anti dive and anti squat)

would it be the same spring rate as stock?

Not normally.

does springrate stiffen/soften ur ride,

Higher spring rate generally (not always) results in a firmer ride.

:cool: cheers :)

  • 2 weeks later...
  • 2 weeks later...
  • 2 weeks later...
stasis Mentor

stasis

Posted
Posted

HiSk,

Can you help me measure up the spring rates for the Tein HA coilovers please? I only had them measured the Springs which are round and not the flat bits at the bottom end of the spring.

Front.

Coil OD :116mm/97mm

Wire OD :14mm

# of coils : 6.5.

Rears.

Coil OD :95mm/95mm.

Wire OD : 14mm

# of Coils : 8.125

Thanks Buddy.

  • 3 weeks later...
ellie Proficient

ellie

Posted
Posted

I had a look through the threadbut couldn't see any standard spring rates?

I'm after the standard front and rear spring rates in Kg's for an R32 GTS-T. If it has been posted but I missed it, please don't burn me!

  • 2 weeks later...
  • 3 months later...
some_cs_student Veteran

some_cs_student

Posted
Posted (edited)

Got bored one day when I wanted to work out my spring rates for the ohlins coilovers I had a tried to guess the spring constant rate Sydney Kid's program was using using some basic mathematics.

Unfortunately I could never get it quite right :P, but if anyone has an idea of how to fix my little excel spreadsheet calculator please PM me :)

Attachment fixed, excel files are not allowed :(

spring_rate_calculatorv2_excel97.zip

Edited by some_cs_student
Sydneykid Grand Master

Sydneykid

Posted
  • Author
Posted
I had a look through the threadbut couldn't see any standard spring rates?

I'm after the standard front and rear spring rates in Kg's for an R32 GTS-T. If it has been posted but I missed it, please don't burn me!

~165 lbs or 3kg/mm

Cheers

Gary

Sydneykid Grand Master

Sydneykid

Posted
  • Author
Posted
Hey mate. Could you please tell me the rates of my rear DAB Gymkhana's on my S13?

Coil ID = 74/74 mm

Wire OD = 10 mm

# of Coils = 7.25 turns

Spring rate = 175 lbs/inch (3.1 kg/mm)

Thank you.

Sydneykid Grand Master

Sydneykid

Posted
  • Author
Posted
HiSk,

Can you help me measure up the spring rates for the Tein HA coilovers please? I only had them measured the Springs which are round and not the flat bits at the bottom end of the spring.

Front.

Coil OD :116mm/97mm

Wire OD :14mm

# of coils : 6.5.

265 lbs/inch 4.7 kg/mm

Rears.

Coil OD :95mm/95mm.

Wire OD : 14mm

# of Coils : 8.125

265 lbs/inch 4.7 kg/mm

Thanks Buddy.

some_cs_student Veteran

some_cs_student

Posted
Posted

Hey Sydneykid,

Do you happen to know what stock R34 GTR (or R33 GTR) spring rates are? I've been told R33 GTR and R34 GTR standard springs are the same.

Just curious so I can compare the rates to my ohlins :banana: (in an R33 GTR)

Ahh found this post that you had posted earlier in the thread:

Sorry, not an easy question to answer, there seems to be a few different standard spring rates in R34GTR's. I have seen three different rates, standard R34GTR, V Spec and N1 (maybe NUR spec), there may be others. The lightest was 165 lbs (3kg/m) per inch and the heaviest was 205 lbs per inch (3.7 kg/mm).

And on this one:

Keep in mind that GTR's handle best around 355 mm front and 345 mm rear (centre of wheel to guard).

My car currently has a bodykit so its waaay above 355/345 to be legal. Also, I thought the rear-end would be higher?

Is that wrong?

I think my car is 370mm/375mm, to keep just over 12cm off the ground on the front bar (may be a little less), I just want to stay about the 10cm legal height in Vic ;). It may also have aftermarket front guards, I'm not sure (they feel like there made of fiberglass).

The car looks like its sitting evenly (as in start and the end of the sideskirts) and seems to handle pretty well but I've only done one advanced driving course, not enough hard driving to know for sure.

Regards,

Gareth

Sydneykid Grand Master

Sydneykid

Posted
  • Author
Posted
Hey Sydneykid,

Do you happen to know what stock R34 GTR (or R33 GTR) spring rates are? I've been told R33 GTR and R34 GTR standard springs are the same.

Just curious so I can compare the rates to my ohlins :no: (in an R33 GTR)

Ahh found this post that you had posted earlier in the thread:

And on this one:

My car currently has a bodykit so its waaay above 355/345 to be legal. Also, I thought the rear-end would be higher?

Is that wrong?

I think my car is 370mm/375mm, to keep just over 12cm off the ground on the front bar (may be a little less), I just want to stay about the 10cm legal height in Vic :). It may also have aftermarket front guards, I'm not sure (they feel like there made of fiberglass).

The car looks like its sitting evenly (as in start and the end of the sideskirts) and seems to handle pretty well but I've only done one advanced driving course, not enough hard driving to know for sure.

Regards,

Gareth

Hi Gareth, the rear guards are cut 15mm lower, so my recommended centre of wheel to guard measurement (355 mm front and 345 mm rear) actually gives a rake of ~10mm nose down. Rake is best measured at the sills, just behind the front wheels and just in front of the rear wheels. Most body kits have the cut outs there for the jacking points.

Cheers

Gary

  • 4 weeks later...
mikel Community Regular

mikel

Posted
Posted

Hi Gary,

just had my Cusco coilovers taken out:

coil ID 70mm

wire OD 13mm

# coils 8 on the long one ( is this front or rear? - obviously I'd know this if I took them out myself)

# coils 7 on the short one

cheers,

Mike

Sydneykid Grand Master

Sydneykid

Posted
  • Author
Posted
Hi Gary,

just had my Cusco coilovers taken out:

coil ID 70mm

wire OD 13mm

# coils 8 on the long one - rear 450 lbs/inch (8kg/mm)

# coils 7 on the short one - front 550 lbs/inch (10 kg/mm)

cheers,

Mike

Cheers

Gary

RS581 Rookie

RS581

Posted
Posted (edited)

Wouldnt the spring hardness and material effect the rate ?

How can you tell rates without knowing that ?

Or does it assume everything is a "standard"

Ignore that bit you have already answered it several times .....

Hey "I was elected to lead , not to read"

My Ohlins just happen to be on the garage floor

Front

13.8mm wire

7.5 Coils

92.5mm od

Rear

13.2mm wire

9.25 Coils

92.5mm od

In my opinion , they are hard ...

:P

Edited by RS581

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