Stock/Lowering Spring Rate Compilation

[Ma70.Ent]

Here's a list of lowering spring rates that have been found over the net. I recently found out the rates of the Stock MKIII Pre-89s and the Whiteline Springs, so I've added them here along with the other list. I'll try to find out the spring rates from various companies in the future. I got the Whiteline Spring Rates from an email from a Whiteline Customer Service person, so it's reputable. And as for the Stock MKIII Pre-89s, they seem plausible as a site said they are 16% softer than the Stock MKIII 89+. Before anyone says Tanabes are linear, they are not. While I have no personal experience with them, I emailed Tanabe and a rep said they are progressive in some areas, and linear in others. This means its progressive since its not one set spring rate, as far as I can tell.

There are some debate about the stock MK3 springs. Some manufacturers who give out rates say the rates are 15-30% more than stock which would actually lead the 89+ springs to be around 390 lb/in in the front and the 87 springs to be around 330 lb/in in the front. But most really wouldn't care about the stock spring rates because it's still 4x4 height and stuff.

* Stock MKIII Pre-89
* Front: 461 lb/in
* Rear: 180 lb/in
* Drop: It's higher than the Stock MKIII 89+
* Type: Linear

* Stock MKIII 89+
* Front: 461 lb/in
* Rear: 215 lb/in
* Drop: 0
* Type: Linear

* Stock MKIV
* Front: 430 lb/in
* Rear: 219 lb/in
* Drop: 0
* Type: Linear
* Notes: Only the front MKIV Springs will fit our cars.

* Eibach
* Front: 343-628 lb/in
* Rear: 126-257 lb/in
* Drop: 1.3" - 1.0"
* Type: Progressive

* Suspension Techniques
* Front: 442 lb/in
* Rear: 147-175 lb/in
* Drop: 1.3"
* Type: Linear Front, Progressive Rear

* H&R
* Front: 575 lb/in max
* Rear: 285 lb/in
* Drop: 2"
* Type: Progressive

* Tanabe
* Front: 442 lb/in
* Rear: 207 lb/in
* Drop: 1.1" - 0.6"
* Type: Progressive

* R*SR Race
* Front: 677 lb/in
* Rear: 335 lb/in
* Drop: 1.4" - 0.8"
* Type: Linear

* R*SR Sport
* Front: 503 lb/in
* Rear: 262 lb/in
* Drop: 1.2" - 0.8"
* Type: Linear

* Tokico
* Front: 395 lb/in
* Rear: 198 lb/in
* Drop: 1"
* Type: Linear

* Whiteline
* Front: 381 lb/in
* Rear: 218 lb/in
* Drop: 1.0
* Type: Linear

* Intrax
* Front: 700 lb/in max
* Rear: 220 lb/in
* Drop: 1.6" - 1.3"
* Type: Progressive

* B+G Suspension
* Front: ?? lb/in
* Rear: ?? lb/in
* Drop: 1.3"
* Type: Progressive
* Notes: Said to have similar spring rates to Eibachs.

* Apexi
* Front: 626 lb/in
* Rear: 240 lb/in
* Drop: 1.3"
* Type: Progressive

* Aerospeed
* Front: ?? lb/in
* Rear: ?? lb/in
* Drop: ?
* Type: ?

[7Mboost]

For the spring rates listed that vary, when/why do they vary?

[toy fanatic78]

How would you test/find out spring rate for springs that aren't listed?

[Doward]

How about the JDM TTR Spring rates?

[toy fanatic78]

I was wondering about the TRD's I have.AFAIK there are at least 2 different rates for the MK3 springs they made too.
I think they are different than the re-badged Enkei's too,'cause they dropped the car almost 3" from stock

[Ma70.Ent]

For the spring rates listed that vary, when/why do they vary?

If I understand your question correctly, some are progressive, some are not...which causes them to have a spring rate "range".


How about the JDM TTR Spring rates?

Unfortunately I do not know. They're probably stiffer than the stock springs since they're paired up with Bilsteins.

[Piratetip]

Thanks MA70!

I have been trying to find the rates of the whitelines for awhile.
You must have found someone intelligent there, when I contacted them, they had no idea.

[Ma70.Ent]

Thanks MA70!

I have been trying to find the rates of the whitelines for awhile.
You must have found someone intelligent there, when I contacted them, they had no idea.

Hah, this lowering spring rate compilation has been up for awhile. You must have been waiting for a LONG time. :P

[Piratetip]

Hmm, haven't noticed until now. :dunno:
Either way, still good. :D

[Canuckrz]

H&R's site says it lowers 1.6" in the front and 1.3" in the back. Is the figure on their site incorrect? Because it seems you certainly did your homework.

Here's the link to the specs on the H&R site: http://hrsprings.com/scripts/appguide.php?Mode=Application+Guide&SubMode=Find2&Year=1986&ModelID=438&q=1986%20|%20TOYOTA%20|%20Supra

[Mk3runner]

Any updates to listed spring rates and such or was this a general list??

[Doward]

I'm still curious as to the TTR springs. I may just test mine, even though they are used.

[Neodeuccio]

Does anyone know of a thread that touches on which spring rates are better for which applications? I know there has to be one out there, but I couldn't find it. I know you would want different springs for a drag setup than you would for a road course set up, but I don't know how to determine which ones do you want.