Before:
I had Eibach springs with stock wheels and tires, 20mm spacer in the front and 25mm rear. the car handled fine for me.

now After new setup:
Still Eibach in the front, Tanabe rear, Vossen 082 +25 +30 offset 255 285 tires.

car does not handle the same (feels Weaker, softer), I did get an alignment done after switching from eibach to tanabe in the rear.

So I though of different reasons this could be:

Tire pressure? (Currently set as 35 PSI)
Tanabe rear softer than Eibach?

I just need to know if my assumptions are kinda right?

Also does hotchkins sway bars help in this situation?

I though tanabe and eibach have the same spring rate or pretty close.

Please just give me some ideas. I was even looking into getting s-techs for the rear. but by now I should have just bought coils (BUT PLEASE NO COMMENTS ON THAT SINCE ITS TOO LATE ALREADY) I AM SIMPLY ASKING HOW I CAN MAKE THINGS BETTER WITH CURRENT SETUP, THANKS.

 

uhh which tanabe springs did you use?

I seen someone mixed and matched coilovers... but springs? Is that a new trend or something? Putting two different suspension set up on a car...

 

what tires are you running

 

Check what the spring rates are on each of the springs you're using and see if the Tanabes you installed are softer.

It should feel stiffer if you have a lower stance and shorter tire sidewalls. And yes, the stiffer sway bars will stiffen up your handling when tge car is in transition. Underbody braces will too.

 

The tanabe and eibach springrates should feel pretty similar, although the tanabes are a tad softer IMO.

I had eibachs on and put on tanabe fronts to even out the fender gap. The front felt just a tad softer after I put them on, which i actually liked. I only noticed it going over bumps but when taking corners fast, I didnt notice a difference at all. Same with when entering and exiting corners when one side of the car was under load and it transferred to the other side, I didnt notice a difference at all either.

The springrates of the NF210s are 7.6 front and 7.2 rear. I think the eibachs are just a tad stiffer.

Im not 100% sure on this, but judging from how my car felt with the springs, I believe the Eibach's are progressive and the tanabes are linear. Driving with the eibachs, when the spring compressed, the ride felt much stiffer whereas the tanabes were much more comfortable. I dont think you would be able to tell the difference driving in a straight line, but when taking a turn and the car is under load, you would feel the increase in the eibachs because of the progressive spring whereas the tanabe would still feel soft.

What tires do you currently have on the car? Some tires can make the car feel softer.

And as BB said, if you feel the rear is soft and you want to stiffen it up a little bit, bigger sways would do that.

 

I got the nitto Invo with NF210 Springs, I cant find anything on Eibach spring rates. I read somewhere that the nitto invos do need to be compressed to around 40 PSI. I am going to try that.

 

^ A lower tire pressure might have something to do with it.

Also, Eibach springs are progressive, so they will have a lower springrate at first, and then a firmer springrate. Its not a constant springrate. Each coil is spaced differently and can have a different springrate.

The lower springrate is for minor bumps and normal driving to give the car a more stock like feel, and the firmer springrate is for when theres more load put on the suspension.

Heat posted this in another thread:

https://www.myg37.com/forums/brakes-...ing-rates.html

Eibach spring rates are 228 to 548 lb/in front and 371 to 531 lb/in rear. So converting to kg/mm for comparison, the Eibach fronts are 4 to 9.8 kg and the Eibach rears are 6.6 to 9.6.

When the Eibach springs are on your car and your car is sitting, the springs are compressed, so the actual springrate is higher than the 4 kg front and 6.6 kg rear. After driving on Eibach's for a few months, the 9.8 and 9.6 springrates feel accurate.

The tanabes are linear and are 7.6 kg front and 7.2 kg rear.

So when the suspension is fully compressed, the Eibach's will feel stiffer vs. the tanabes. Although for normal driving around on little bumps and turns, the springrates of the eibach and tanabes will feel very similar. However, when the spring is under load and compressed, you will feel a difference.

 

Thanks alot, This helps, I guess I gotta go for the sway bars now, that should over the couple kg spring rate difference.