Strength rating on TJ coils

RatLabGuy

RatLabGuy

You look like a monkey and smell like one too
Joined
May 18, 2005
Location
Churchville, MD
I'm trying something, sliipin gsome coils under my '89 4Runner (zuk style). Understand that TJs are the easiest to do.
Does anybody know the approximate weight per inch on these? I'll probably have to cut 'em short, but it'd be nice to get a approximation on how much. Don't want 'em jackin' my backside way up.
 
Check some of the PBB threads on coilover springs, I BELIEVE i remember it being mentioned that stockers were ~150lb-in, with the aftermarkets getting up in the 175 range?
 
FYI...there is also a lot of variance among TJ springs...

a 4-banger with a soft top usually has a lot lighter springs than a Rubicon with the I6 and hard top...

there's no set formula as to which springs came with which combo, but you can usually find the tag on the spring and go from there...

the difference between the "softest" and firmest" can be up to an inch of lift for a TJ...

Greg
 
I'm pulling this out of the Jeep performance handbook.....

97 - 98 TJ
Front - 120
Rear - 160

The book does not specify engine/top, they have a pretty good point about the engine/hard top. I figured the heavier duty spring would be in the front not the rear, that could be a typo? This was also published in 98 - before the Rubicon - Unlimited models.
 
rbo1577186 said:
I'm pulling this out of the Jeep performance handbook.....

97 - 98 TJ
Front - 120
Rear - 160

The book does not specify engine/top, they have a pretty good point about the engine/hard top. I figured the heavier duty spring would be in the front not the rear, that could be a typo? This was also published in 98 - before the Rubicon - Unlimited models.
Click to expand...


maybe has something to do with the fronts being twice as tall as the rears? really don't know...

Greg
 
This is what I have been told about coil spring rates from race car guys....

Wire diameter (the diameter of the coil itself) - thicker = stiffer
thinner = softer

Number of coils per foot - The more coils per ft the softer, less coils the stiffer. The fewer the coils the more a spring resembles a straight piece of steel, thus the less give. More coils = more lateral stress.
 
I'd also heard the fronts were lighter. And thinner?
The intention of this is just to help prop up my back end a little, maybe only a little hwne empty, more so so when loaded. Basically in place of adding leave to the spring pack, as this just makes the ride stiff and reduces vertical wheel travel.
 
you had mentioned cutting them down, but be aware that doing that raises the effective spring rate, so it could get much stiffer depending on how much you cut
 
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