Eibach Pro-Kit vs RCE Yellow
 

Looking for a subtle drop on my car. What's the differences between these two?

You're gonna get a lot of flak for this, springs are a commonly discussed topic and can quickly be searched for lots of info.

To prevent this from turning into another "OMG forum etiquette" thread, what are you looking to achieve besides a mild drop? Looks only? Track days?
The specs of each spring set are really easy to find, so what kind of comparison are you looking for?

Also a good idea to add if you plan on replacing shocks or not.
Having stock shocks vs, say, Koni Yellows. Will be a difference.

:search:

The RCE springs work great on the stock shocks/struts as would the Eibachs. Difference through is that the prokit is designed to lower the car without really increasing performance. The RCE springs will lower the car and increase performance dramatically.

Tony

Tony,
Would you say "increase in performance" at the sake of comfort? Is there a compromise on handling vs road comfort on poor road conditions between the two brands?

Thanks for your input.

I disagree with the Eibach springs not increasing performance. Both springs will increase performance...just in different ways. Not every driver will set up their cars the same way. It's like saying your car is wrong because it's painted blue and not black.

The RCE springs are more of a square set up with similar front and rear rates.

The Eibach springs have a rear biased spring rate like the OE BRZ and FR-S springs do.

The difference comes down to driver preference. Ironically, the RCE springs are made by Eibach as mentioned in their post below. You can't go wrong with either.

http://www.ft86club.com/forums/showt...?t=9936&page=2

I only went for a ride once in a car with RCE yellows but it was a very bumpy road. Seemed just like stock, maybe a tiny bit harsher but that's probably more placebo than anything.

@Phaedrus29 can chime in hopefully!

For your BRZ, the RCE Yellows are 66% firmer in front and 28.5% firmer in the rear, and the drop is roughly 3/4 of an inch all around.

The Eibach are about a full inch all around, and as Jackson stated, keeps a rear bias (33% firmer in front, 40% firmer in rear).

Personally, I liked that the Eibachs matched the stock setup's spring rate ratio more, and offered a tiny bit more drop. From what I remember reading about spring rates in RWD cars, firmer rear rates increase your ability to slide the tail, which is something I wanted after putting wider, stickier tires on my new wheels that I installed at the same time.

While I'm sure there's not a significant difference between the 2, my guess is that the RCEs would make oversteering a tad more difficult, which is probably better for speed on a track, but less fun when you want to get sideways.

For me and a couple other guys in my area the Eibach Pro-kit dropped the car 7/8", not a full inch. Pretty close though. :) I think the pro-kit is similar to stock handling wise as far as rear end kick out except it feels a hair bit better in a corner.

I found the same to be true for myself, though I did not measure the exact drop amount. I kind of wish there was an option for the back to be closer to a 1 1/4" drop, as I'm a sucker for symmetry and the rear still looks high compared to the front, but overall it's much better than stock.

That symmetry is something I notice with the wheels as well. While I wanted to go with the same wheels at each corner, I can't help but wonder if I should have gone +35s only in the rear, and dropping to +45s for the fronts..

I guess it really depends on what you want. If you are looking for outright grip and lap times on a road course I think the RCE would be a bit better. Lowering too much on a strut based car is never a good thing especially when strut travel is limited and non adjustable.

Tony

Again, this is all relative. I would love to hear your personal on track driving impressions of both kits. Have you driven and tracked both the RCE and Eibach springs?

Please explain how you came to that conclusion?