If we replace the rear sway bar with a larger diameter version, the sway bar will develop more resistance to the dynamic forces that induce the body roll, so less body roll is the result. How do we help the chassis balance? If we increase the rear roll stiffness (larger diameter sway bar) and leave the front sway as is, the vehicle will have less understeer. So we did it, and it works well on this platform. It’s rare to make a chassis modification for better handling, and not have an obvious down-side show up somewhere. This mod just works! It’s not too much of a good thing, it’s just enough to polish the gem that Honda has crafted.
Although the sway bars look very similar, they perform very differently. The PROGRESS bar is 3.6mm larger in diameter, but increases the sway bar spring rate 96%. This big bump in sway bar rate is very noticeable, even within a few minutes of driving. You will feel it right away, even on moderate lane changes and highway sweepers during commuting. Of course it shines when you hammer it a bit harder on a good stretch of road. As you continue to ‘press’ the chassis harder, the body roll will initiate at first, then the chassis will ‘load up’ the sway bar, and you can feel the sway bar working to limit the roll. Cornering will be much flatter and steering inputs will be less as there is less overall understeer.
This rear sway bar installs quick and easy, just six fasteners hold it all in place. It may take longer to safely jack up the car and position the jack stands! You will need a torque wrench to tighten the fasteners and end links properly. Watch the install video here:
We discussed rates and bar diameters, and the feedback was ‘that’s just what we are looking for. How soon can you ship us two units?’ Why? It turns out that HRW was race-prepping two Tenth Gen race cars for the '25 Hours of Thunderhill', an epic NASA endurance race, and PROGRESS was able to support their suspension requirement in a very timely manner.
So enjoy the same sway bar that Honda Research chose for their race cars, and we can say:
“Team Honda Research West uses Progress product for 25 hour endurance racing.”
If you've been involved in any club or pro level endurance racing, you understand what it takes to race hard for 25 hours. The race cars require a high level of preparation and as many development miles as time and the budget will allow for. The crew needs to be sharp and to stay in the groove for hours on end. Problems come up on the track in seconds, and the crew needs to be ready for whatever comes their way. Drivers need stamina, patience and excellent concentration to stay on the edge and alert for the long stints through the event. Racing all night with limited vision and tired drivers is another challenge. It's rewarding and draining at the same time. Any racer that completes one of these all-night enduros has some stories to tell!