Question about Spring rate - Toyota Yaris Forums

window_lee · 10-13-2009, 10:43 PM

I am look for coilover since I am tired of my lowering spring. they are just not hard enough. however, there are many different types of coilover in the market and they all have different spring rate. I am just wondering if a greater spring rate in the front will give u a better handle or the other way around.

plz give me some advices

Loren · 10-18-2009, 09:57 PM

Typical FWD car (Yaris) likes higher rear spring rates to help combat the problems inherent with front wheel drive.

I'm running nearly twice as much rate in the rear vs. the front. The balance is nice. The ride quality from running 7kg/mm springs in the rear is not nice.

rob323 · 10-19-2009, 11:17 PM

Quote:

Originally Posted by window_lee

I am look for coilover since I am tired of my lowering spring.

With what shocks?

Quote:

they are just not hard enough. however, there are many different types of coilover in the market and they all have different spring rate. I am just wondering if a greater spring rate in the front will give u a better handle or the other way around.

plz give me some advices

My view is that there is not much point talking about spring rates with talking about shocks at the same time. A stiff spring on a comfort orientated shock will still probably not give you the response you are after.

In saying that, I have 175 pound fronts and 220 pound rears on my rally suspension, but I can adjust the dampening from soggy soft to bone jarring hard to suit the surface.

ddongbap · 10-20-2009, 12:30 AM

IDK what 220lbs translates to in KG, but you should always match the shock to the spring rate, and vise versa.

rob323 · 10-20-2009, 12:37 AM

220 lbs per inch = 8.66 lbs per mm = 3.93kg/mm.

(so I'm running 3.1kg/mm fronts and 3.93kg/mm rears - stupid Aussie spring manufacturers still stuck in the dark ages

).

Agreed, shock valving should be ideally matched with the spring.

window_lee · 10-20-2009, 04:31 AM

Thanks for the answer. I am using stock shocks with Tanabe lowering spring
I think i will get the coilover which can adjust the dampening

rob323 · 10-20-2009, 04:22 PM

Just buy better shocks which are more suited to stiffer springs.

10-13-2009, 10:43 PM	#1
window_lee Drives: Yaris RS 2007 Join Date: Oct 2006 Location: Canada Posts: 124	Question about Spring rate I am look for coilover since I am tired of my lowering spring. they are just not hard enough. however, there are many different types of coilover in the market and they all have different spring rate. I am just wondering if a greater spring rate in the front will give u a better handle or the other way around. plz give me some advices

10-18-2009, 09:57 PM	#2
Loren What? Drives: 2007 Yaris LB Join Date: Nov 2008 Location: Safety Harbor, FL Posts: 1,006	Typical FWD car (Yaris) likes higher rear spring rates to help combat the problems inherent with front wheel drive. I'm running nearly twice as much rate in the rear vs. the front. The balance is nice. The ride quality from running 7kg/mm springs in the rear is not nice. __________________ ----------------------- Loren@InvisibleSun.org -----------------------

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10-20-2009, 12:30 AM	#4
ddongbap Banned Drives: yw calls me douche and racist. Join Date: Aug 2007 Location: hay Posts: 2,183	IDK what 220lbs translates to in KG, but you should always match the shock to the spring rate, and vise versa.

10-20-2009, 12:37 AM	#5
rob323 Don't drive it, RALLY it! Drives: 1999 echo PRC rally car Join Date: Oct 2008 Location: Joyner, Brisbane Posts: 321	220 lbs per inch = 8.66 lbs per mm = 3.93kg/mm. (so I'm running 3.1kg/mm fronts and 3.93kg/mm rears - stupid Aussie spring manufacturers still stuck in the dark ages ). Agreed, shock valving should be ideally matched with the spring.

10-20-2009, 04:31 AM	#6
window_lee Drives: Yaris RS 2007 Join Date: Oct 2006 Location: Canada Posts: 124	Thanks for the answer. I am using stock shocks with Tanabe lowering spring I think i will get the coilover which can adjust the dampening

10-20-2009, 04:22 PM	#7
rob323 Don't drive it, RALLY it! Drives: 1999 echo PRC rally car Join Date: Oct 2008 Location: Joyner, Brisbane Posts: 321	Just buy better shocks which are more suited to stiffer springs.