Race Tracking Your Supra - Information exchange

[FLtrackdays]

You can try and do the math to figure out the % increase in stiffness. But good luck finding the bar dimensions.

I’ve given up on products that don’t disclose this kind of information. If you’re not going to help me make an informed decision, then I’m not going to consider your product. Same goes for aero downforce v friction charts, brake pad friction charts, ect.

You might like the Eibach sway bars. They have 3 different settings. You can dial in your feel, what you like

Sponsored

 

[razorlab]

OEM sway bars:
Front: 24mm
Rear: 18mm

Cusco sway bars (non-adjustable) for the MK5 Supra are:
Front: 28mm (194% Stiffer than Stock)
Rear: 22mm (178% Stiffer than Stock)

Eibach (3 way adjustable) is:
Front: 29mm
Rear: 23mm

AFE (3 way adjustable) is:
Front: 29mm
405 lbs/in (134% Stiffer than Stock)
455 lbs/in (163% Stiffer than Stock)
510 lbs/in (195% Stiffer than Stock)
Rear: 22mm
130 lbs/in (155% Stiffer than Stock)
145 lbs/in (184% Stiffer than Stock)
160 lbs/in (214% Stiffer than Stock)



*I found all these stats on their respective websites after a 2 min google search.

 

[Joker328]

Has anyone done any testing to see if they are actually any faster after installing sway bars? I know in general there is an assumption that stiffer = better/faster, but is there any evidence of it on our cars?

 

[kyle9]

OEM sway bars:
Front: 24mm
Rear: 18mm

Cusco sway bars (non-adjustable) for the MK5 Supra are:
Front: 28mm (194% Stiffer than Stock)
Rear: 22mm (178% Stiffer than Stock)

Eibach (3 way adjustable) is:
Front: 29mm
Rear: 23mm

AFE (3 way adjustable) is:
Front: 29mm
405 lbs/in (134% Stiffer than Stock)
455 lbs/in (163% Stiffer than Stock)
510 lbs/in (195% Stiffer than Stock)
Rear: 22mm
130 lbs/in (155% Stiffer than Stock)
145 lbs/in (184% Stiffer than Stock)
160 lbs/in (214% Stiffer than Stock)



*I found all these stats on their respective websites after a 2 min google search.

Also worth noting that the Eibach rear sway is solid and thus a bit stiffer than the hollow aFe. Cusco are hollow as well.

Whiteline make solid sway bars in the same size as oem (oem is hollow) iirc. They have info on the stiffness of their swaybars if you call them. I took notes at one point but am not sure where they are. It was about halfway between aFe and OEM.

In terms of stiffness its:

Eibach (adjustable) > aFe (adjustable) ~ Cusco (fixed) > Whiteline (adjustable) > oem (fixed)

 

[kaj]

Has anyone done any testing to see if they are actually any faster after installing sway bars? I know in general there is an assumption that stiffer = better/faster, but is there any evidence of it on our cars?

I asked a few posts back and the answer is mostly "no". Feels better? Yes, of course. Flatter always feels quicker, but lap times sometimes tell a different story.
**Edit: unless you are doing AutoX. Giving up a bit of lateral grip in favor of quicker transitioning is 99% going to be the right choice.

 

[FLtrackdays]

Has anyone done any testing to see if they are actually any faster after installing sway bars? I know in general there is an assumption that stiffer = better/faster, but is there any evidence of it on our cars?

That would be a cool test if anyone has only done sway bars to their car.

What I’m looking for is quicker input & control when counter steerIng out of a sticky situation. I don’t want the car to be “loose” while accepting input from the steering wheel. Even in just milliseconds, if the car is still ”swaying”, your input can lag behind. If that makes any sense. Stiffer is the key word and why after market sway bars help so much. Well put @kyle9

 

[Eyelise]

Yup, Eibach just need to release their information so people can make an informed decision on which product they want.

It is nice to know the range from least to highest but considering every set-up is so different the adjustable nature of the Eibachs is certainly helpful. The hope is that you could find a setting empirically that works for your tires, suspension, and driving style.

 

[kyle9]

I guess I’ll share my 0.02 here as well after having a lot of setup challenges, researching sway bars, and driving at modest speeds at a few tracks (2:22 at cota, 1:31 at road Atlanta, 1:33 at barber etc)

If you want a stiffer set up and are running aero then aFe is the best option.

If you like a stiff rear end and oversteer, eibach may be even better.

If you’ve got no aero or stock power/less aggressive tires, or are street driving only, then white line might be best. aFe also works well if you’re on soft springs and want to eliminate some of the body roll. I don’t see eibach as being best here. Staying oem is an okay option as well, particularly with the rear bar if you’d like to maximize rear grip when cornering.

I don’t see a scenario where Cusco is the best choice given its lack of adjustability.

 

[decodeddiesel]

I don’t see a scenario where Cusco is the best choice given its lack of adjustability.

My main reason for the Cusco bars is that I knew for a fact that they play nice with the SPL adjustable LCAs without having to mess with my caster.

 

[FLtrackdays]

If you like a stiff rear end and oversteer, eibach may be even better.

Me

My main reason for the Cusco bars is that I knew for a fact that they play nice with the SPL adjustable LCAs without having to mess with my caster.

This I was having that exact same problem. My mechanic and race alignment shop had to call SPL. They were helpful, I was told. But it did cost me more time/money to make it work.

In terms of stiffness its:

Eibach (adjustable) > aFe (adjustable) ~ Cusco (fixed) > Whiteline (adjustable) > oem (fixed)

Bottom line if you’re going to track your car more than once a year, they’re really nice to have. Feels better too. Which is a very objective.

Haven’t heard from @Todday1 in a while & wonder which ones he chose. Appreciate him starting this fantastic thread

 

[Rocksandblues]

The trap w spl in front is you can start off w too much adjustment and the tie rods no longer ride under the nice designed in arch on control arm

 

[kaj]

Okay, fine. When I get beat by someone with sway bars, THEN I'll look into installing some. ?

 

[Rocksandblues]

Okay, fine. When I get beat by someone with sway bars, THEN I'll look into installing some. ?

come down to VA.

 

[kaj]

come down to VA.

That's just a biiiiiiiiiiiiiiit outta my way ?

 

[Supra_UK_]

Hi all - hope this is the right thread as I'm looking for information exchange as the thread suggests regarding driving technique and/or setup.

I drive a 3.0 Manual, 100% stock, not track driven but I do enjoy a spirited drive on a quiet twisty road.

When I brake hard from high speeds approaching a corner i.e. 90-100 mph and I feel the rear end get loose and slightly want to "rotate", what are the key dos and donts in that situation to ensure you keep the car stable in terms of foot inputs and steering inputs?

I must admit, I realized I set my Sport mode to sport exhaust and steering but I left suspension on comfort, so perhaps that is a factor as well. Issue is the roads are not greatly surfaced here.
Would stiffer sport suspension mode reduce this?

I have no track experience and this is my first fast rwd car so looking to hear from experienced track drivers here please ✋️

Sponsored