Sway Bar question.
 

I'm looking for a recommendation on which stiffer bar selection (front and rear) for a MY13 FRS would keep the balance the same but stiffening things up a bit. When I lowered and went to sticky tires the roll increased which was expected.
Thanks in advance

What spring rate are you running?


Sent from my iPhone using Tapatalk

Are you on standard springs?
I had the Eibach set on my car with 6k/6k springs. Yeah, the car kept quite flat cornering but I could feel the cross talk at the front through bumpy corners. I ended up taking them off and not using any sways.

Because compromise.

H&R not sure of the numbers

I have Hotchkis adjustable bars, which I like, because you can tune with them.

Keep the stock sway bars and upgrade the springs to reduce body roll. It’ll allow each corner of the car to operate independently of the other.

What rates are you running now?

When I was in CS (a class in autocross ) I had the TRD springs that I *think* increased rates front and rear by the same amount. (So they would not have changed the balance)

When I went with the TRD sway bars, the car's balance tilted heavy toward understeer. I ended up going with a an ST front bar on the softest setting and kept the rear TRD bar. This got me back to stock-ish balance.

Springs or coilovers? Which kit...that'll tell others what you have?

I have the Eibach Pro Kit (1'' drop) and larger, stickier tires, so extra roll like you described is there. I have been considering a thicker front sway bar too, especially after adding front weight with my supercharger. From everything I read people have said to leave the rear alone and just slightly increase the front, yet everyone also says that a sway bar is a BandAid that would be better fixed with some good coilovers. I haven't decided if I will do a sway bar because coilovers are not on my budget at this time.

Right however I'm inquiring about front rear bars that keep the handling basically balanced. Front bar stiffer then you increase push. Need thicknesses for front rear that keep things the same but just less roll. Probably will just increase both in equal thickness percentages

But the more you stiffen the rear, the more the suspension moves away from an independent rear suspension behavior to a solid rear axle behavior, which isn't good for any car that is a RWD track car. If you want to drag the car then stiffen up the rear. Now, to what extent you will be three-wheeling around the autocross track based on a two millimeter diameter increase in the size of the sway bar is speculative at best; you will probably be fine with small changes, but just in case, you could get an adjustable bar. It is more expensive, but if you decide you overdid it then you can at least make adjustments instead of being SOL.

20/16 will slide more than stock but 21/16 will push more than stock. I don’t think anything can replicate the 18/14 exactly.

I've got MCA coils with stock bars, the car is on rails.

Spring rates are 6kg front 4.5kg rear.

Point of note is that MCA recommendations are to keep the OEM bars as the suspension is designed to give best performance with the OEM bars.

You really need to look at your handling package as a whole, otherwise you end up chasing your tail and may end up sacrificing grip.

7k/6k.