I am not sure if the issue of L-tuned=Eibach was ever resolved. After performing a side by side comparison, I came to the conclusion that they are not exactly the same set of springs regardless of whether or not Eibach made the springs for Lexus.

Test #1. The springs were weighed on a professional scale. Result:

L-tuned front, 10.0625 lbs.
Eibach front, 9.8125 lbs.

L-tuned rear, 10.00 lbs.
Eibach rear, 10.00 lbs.

Test #2. Downward force applied. This is with the use of a lever using a constant weight. Result:
The Eibachs provided a bit higher spring rate than the L-tuned. Not day and night difference but conclusive enough to suggest the findings.

Test #3. Physical observation. Result:
Fronts: The Eibach has two small winds of coil towards the end whereas the L-tuned has one small wind of coil. That is proof of why the L-tuned has less spring rate.

On the picture below, the Eibach is on top of the L-tuned.

 

Test #4.
Rears: Almost the same, although it appears that the base of the L-tuned coil is slimmer than the Eibach.

See pictures below.

 

Wow, great post and information, thanks!

A mystery that's been around for a long time! I always thought my old Eibachs felt different than the L-tuned in other's cars, but wasn't sure if i was just the shocks being different... Guess it was both

 

Very informative post!

I haven't followed the discussion so excuse my ignorance here....but the missing data to prove one way or another has been a lack of published spring rates for the L-tuned set?

 

L-tuned (on bottom of the pic) and Eibach Springs, for the front. Note the two small coil windings on the Eibach versus L-tuned's single.

 

Note the base of the coils....the L-tuned has a slimmer spring base.

 

This is GREAT info. As this questioned is asked hella time. READING NEWB???

 

Another FYI. Stock OEM springs weigh approximately 3 lbs LESS per piece when compared to both Eibach and L-tuned springs!!!!

 

L-tuned (on top) next to the OEM spring, both rears. Now you know why the OEM dieted by 3 lbs ;-))

 

so....the Eibachs are more stiff?

how about Eibach Pro kit + Ltuned shocks combo?

Will that be stiff?

Pete

 

That should be more comfy than Eibach/Bilstein, or a hair stiffer than full L-tuned.

 

I have the Bilstein/Eibach Pro Kit combo and the ride is excellent! Not that stiff at all...best of all the ladies can't tell the difference!!!

 

What do you mean ladies (plural)? We know you're a married man!

 

What tires/rims are you running?