I am going with 892 lb/inch (16kg/mm) now for front and rear

 

Strang etaht Mugen has such a difference between front and rear rates.

Also the go the inverse way than SPOON ?!

Could it be that the spring rates don't affect the ride THAT much than we think?!

 

I've tried these different springs on my JRZ's:

Front/Rear:
425/550
500/550
500/650
550/650
550/750
650/750 and probably a few other permutations

You can definitely feel the difference in ride and handling, but this probably varies (greater?) depending on the shocks too.

 

psst google is your friend.

http://www.google.com/search?q=14kg%2Fmm+in+lb%2Fin

 

I could have done the conversion myself (I'm an ex-scientist ya' know ) if I had known that it was Kg/mm (which I didn't). But I live by Google also.

 

I found this thread and wondering on the 02-03 spring rates if they are correct. I have an 01 and have suspension that I pulled off a 02 when installing Tein kit. I wanted to play with the rates if in fact this is a correct calculation of spring rates. I was thinking of putting the 02 springs in front and leaving the 01 raers alone. Any insight will be very helpful.

 

I would put the Tein springs on with the Tein kit. I suppose the Tein springs are MADE FOR the kit and the suspension geometry of the car. I would NOT recomend swopping OEM springs of different years. Those springs are there for the purpose of the respective year; and there for a specific reason from Honda engineers. Go with the Tein.

 

I understand what your saying but in order to stay in my stock class I have to use factory springs. The Honda engineers changed spring rates for a reason, so if I have the newer springs and shocks I would think going with the 02 setup will be better for handling. No? Most setups run about a 50lb difference front to rear.Looking at 00-01 to 02-03 running 02 fronts and 01 rears there is 51lb difference.

00-01 - Fr: 218(3.9) - Rr: 291(5.2)
02-03 - Fr: 240(4.3) - Rr: 230(4.1)

 

Spring Rate Changes


Modification Effect on Suspension
Increase front and rear rate Ride harshness increases; tires may not follow bumps causing reduced traction. Roll resistance increases.

Increase front rate only Front ride rate increases. Front roll resistance increases, increasing understeer or reducing oversteer.

Increase rear rate only Rear ride rate increases. Rear roll resistance increases, increasing oversteer or reducing understeer.

Decrease front and rear rate Ride harshness decreases; tires follow bumps more effectively, possibly improving traction. Roll resistance decreases.

Decrease front rate only Front ride rate decreases. Front roll resistance decreases, decreasing understeer or increasing oversteer.

Decrease rear rate only Rear ride rate decreases. Rear roll resistance decreases, decreasing oversteer or increasing understeer.

 

A few months back I took a set of MY 04 OEM springs to Turner Motorsports in MA and had them measure the spring rates with their equipment. Two days and $85 later gave me a printout 5 measurements made on each spring.

Fr(Ave) = 250lbs/in +/-5%

Re(Ave) = 255lbs/in +/-5%

These numbers pretty much agree with the known values for the 00-01MY and the "percent changes" that can be found in the literature.

Cal