I bought some clean 4Runner doors off someone recently, and he was talking about LC torsion bars giving better IFS flex (no he said he wasn't confusing them with LC coils). Anyone ever heard of using longer LC torsion bars (100 series) on a IFS 4Runner. No, I don't mean the rear coils. The longer T-bars would allow for less progressiveness in the front suspension.

This would require remounting the t bar adjuster-end on farther back on the frame.

PLEASE don't tell me about how you've heard that LC coils flex well, because that has nothing to do with this question.

 

I heard that landcruiser coils DO flex quite a bit more than the stock springs...

EDIT:

 

hmm.. I would imagine that they would be pretty stiff since the 100 series front end is much heavier than ours, but I could be wrong.

 

^^ i'm with him

 

and if i had to guess "relocating" the tbar mount isnt as easy as it sounds

 

I was really wondering if anyone else had heard of this as well, or if the guy was just mixed up.

I would assume they would be stiffer as well, yet the fact that LC rear coils' spring rate works suggest the front spring with their respective spring rate may work as well.

 

Sorry I can't help with the question but if you have to start relocating things why don't you do an SAS. I can guarantee you it will flex more than your IFS. A bit more work and expense but if it's flex you want.....

 

Hes not saying he wants more flex ( of course he might buuut), im pretty sure hes simply asking if anyone has heard of this.

 

I'm guessing that the rear weight of an 80series is closer to our 2nd gen's rear weight compared to the front 100 series vs our 2nd gen's fronts.

HOw will it flex more? The bumpstops are still in the same place.

 

Flex more readily would be a better way of putting it. Notice usually, the rear flexes out before the front starts flexing? Coils are just wound up torsion bars really, but instead of a short fat torsion bar (pre-95 IFS), its a long narrow torsion bar (coil). The LC t-bar is apparently longer, and should flex better.

I have no intention of doing this. I was merely asking if anyone has heard of it.

 

It may be longer, but is it really smaller diameter? I guess maybe if you looked on mud, you may be able to find out the stock diameter. I'm guessing there are probably aftermarket ones available that give the diameter.

It would be cool if you found out the stock dimensions on them compared to our stock tbars. If they are close, I could possibly see it helping for LT kits that keep the tbars, it may releave some stress on the tbar caps that seem to be a weak link for the lt kits.

 

OEM 100 series:
Diameter- 28.87 mm
Length- 1160mm or 45.67"

Ours:
Diameter-22.8 MM (Old man emu ones are 23.4mm, swayaway are 25mm, Downey's are 26mm, swayaway 300M race series are 27mm)
Length- 41 7/8"

 

Added the stock length above. Without knowing the spring rate of the LC100's and just going by the diameter, I'm thinking they would be pretty stiff. They are almost 2mm's more than the 300m race applications for ours.

When you look at them, I wouldn't call ours short/fat and theirs long/skinny when compared to each other.

It would be interesting to find spring rates on all these and whether a longer tbar would mean less stress on the end caps for LT applications.

 

The long/thin was in reference to coil springs. Coil springs = long thin wound up torsion springs.

 

^^^^Ah... sorry about that, I must have read through it too fast.


Any thoughts on a longer tbar having less stress on the end caps? I think that is what they are called. (Although, it looks like it might be a total PITA to move that whole thing back a few inches, it would still be interesting to know.)

 

If by end caps, you meant the splined piece that connects the tbar to the UCA, then no, it would have the same force exerted on it no matter the torsion bar. This is because it takes a given about of force to support the weight of the truck (as determined by gravity).

 

Are the splines the same?

 

x2...

 

They wouldn't be as the LC tbar is larger O.D. But, the so called "end caps" from the LC could be redrilled for the Hi Trac IFS perhaps.


Once again, I was mostly wondering if anyone had heard of this before and secondly this was a little mental exercise as the board has been boring lately.

 

I'm not sure if it's that end or the other end. I just know that with the long travel tbar kits they suggest that the 4cyl's upgrade to the V6 ones and for race applications there is chromoly ones. Like I said, I'm not sure which end, I always assumed it was the rear end.

Edit: Yes it is the front sockets they are talking about.
http://www.chaosfab.com/95000BJ.html

You never know that splines may be the same, as just because the bar itself is a bigger OD doesn't mean the end necessarily is. Just like all our aftermarket tbars are bigger OD they still fit the same sockets. More than likely, I'd guess they are not the same though.