Spring rates

[Superooo]

What are your spring rates, damper setup, and what do you use your Supra for?

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[Vtec13]

this is the perfect thread to start. i was looking for answers before ordering my dampers and did not find a good answer.

 

[razorlab]

650 ft/lb front
600 ft/lb rear (true coilover)
MCS 2 way Non-Remote dampers
Whiteline 24mm solid front sway bar
OEM rear sway bar
Verus UCW rear wing
Verus "low df" front splitter
Verus canards

I drive with my eyes closed on the track.

 

[Wetherman]

@razorlab - any fitment or chassis issues using ther true coilover in the rear? Do you know the OD on the springs you selected? Was looking at Nitron NTR R1 and a true coilover in the rear as well. I believe they offer a 2 1/4" and 2 1/2" and maybe a 60mm OD spring - not sure th reason for the metric/English measurement inconsistency but its what they told me. It is a little tight in there but I assume you have had no issues? Thanks in advance.

 

[Andrew4Supra]

Started by swapping to the eibach euro Z4 springs (prefer the .8" even drop) but felt the rears were a bit soft for my liking (characteristics of the cars rear dump under hard acceleration).

The oem rear springs and eibach euro springs were both determined to be 500 ft/lb springs. I swapped to 600 lb rear and finally landed on a 700 lb rear with an adjustable spring perch. Via TC Kline Racing.

I really like the firmer ride and less dump in the rear. The front springs remain the eibach Z4 euro springs. I also added a eibach front sway bar set to the softest setting. This may not be preferred for the track but it's perfect for the street and accomplished just what I was after.

I'm still running the factory struts and shocks.... defaulting to the sport setting at start up.

Hope this is helpful to others.

 

[BA9092]

Started by swapping to the eibach euro Z4 springs (prefer the .8" even drop) but felt the rears were a bit soft for my liking (characteristics of the cars rear dump under hard acceleration).

The oem rear springs and eibach euro springs were both determined to be 500 ft/lb springs. I swapped to 600 lb rear and finally landed on a 700 lb rear with an adjustable spring perch. Via TC Kline Racing.

I really like the firmer ride and less dump in the rear. The front springs remain the eibach Z4 euro springs. I also added a eibach front sway bar set to the softest setting. This may not be preferred for the track but it's perfect for the street and accomplished just what I was after.

I'm still running the factory struts and shocks.... defaulting to the sport setting at start up.

Hope this is helpful to others.

Awesome!

Any links to the rear springs and adjustable perches?

 

[Andrew4Supra]

Any links to the rear springs and adjustable perches?

~ https://www.tcklineracing.com/

 

[BA9092]

I wonder what the (ft/lb) rates are for the front Euro Eibachs? Can't seem to find that anywhere.

 

[Rocksandblues]

nitron r3- 150- 750

 

[concept]

I wonder what the (ft/lb) rates are for the front Euro Eibachs? Can't seem to find that anywhere.

Maximum Load Front:	865 kg
Maximum Load Rear:	995 kg
Weight:	About 11.8 kg
Reference:	E10-20-046-02-22

Eibach Pro-Kit Lowering Springs E10-20-046-02-22 for BMW Z4 Roadster | eBay

Maximum load is probably not what you're looking for, but I thought I throw this out there.

 

[BA9092]

Maximum Load Front:	865 kg
Maximum Load Rear:	995 kg
Weight:	About 11.8 kg
Reference:	E10-20-046-02-22

Eibach Pro-Kit Lowering Springs E10-20-046-02-22 for BMW Z4 Roadster | eBay

Maximum load is probably not what you're looking for, but I thought I throw this out there.

Yeah, this is the only reference I found as well. But it doesn't make sense. For the front at least.

Most aftermarket springs range between 200-270 lbs/in for the front and 580-700 lbs/in for the rears.

995 kg for the rears make sense since it would be roughly 550 lbs/in - just barely above stock.. However, 865 kg for the fronts sounds way off as that would make them more like 480 lbs/in.

I'm expecting a number around 340 kg for the fronts.

Are the max loads read differently?

 

[concept]

Yeah, this is the only reference I found as well. But it doesn't make sense. For the front at least.

Most aftermarket springs range between 200-270 lbs/in for the front and 580-700 lbs/in for the rears.

995 kg for the rears make sense since it would be roughly 550 lbs/in - just barely above stock.. However, 865 kg for the fronts sounds way off as that would make them more like 480 lbs/in.

I'm expecting a number around 340 kg for the fronts.

Are the max loads read differently?

I found this (Motortrend):
"Spring rate is the amount of force required to compress a spring 1 inch, while spring load is the force required to compress a spring to a certain height. For example, a 350-lb/in spring requires 350 pounds of force to compress 1 inch. A spring that compresses 2 inches under 200 pounds of load will compress 4 inches under 400 pounds of load."
The question is, how many inches does each spring compress?

 

[razorlab]

Yeah, this is the only reference I found as well. But it doesn't make sense. For the front at least.

Most aftermarket springs range between 200-270 lbs/in for the front and 580-700 lbs/in for the rears.

995 kg for the rears make sense since it would be roughly 550 lbs/in - just barely above stock.. However, 865 kg for the fronts sounds way off as that would make them more like 480 lbs/in.

I'm expecting a number around 340 kg for the fronts.

Are the max loads read differently?

Those aren't spring rates, those are the load ratings. What concept shared with you is worthless to what you are trying to find.

 

[i3igpete]

if you have a set of digital calipers/tape measure and measure the following, you can calculate the spring rate:

wire diameter
coil diameter
coil count
end/dead coils at installed height
material you can assume generic steel, the exact alloy is mostly irrelevant for rate

I can go further down the rabbit hole but I'll stop there.

 

[Nugs]

I'm running Mfactory coilovers with swift springs
Front: 10kg (560 ln/in)
Rear: 16kg (895 lb/in)
Still a part time road car, but mostly focused on track performance.
No aero, 295 A052s, 680whp.

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