Project Acura RSX Sleeper, Buttoning Up the Project With Suspension!

We left off in our last edition of Project DC5 RSX with some killer brakes by Stoptech that brought our cars stopping power in line with our fantastic 300 whp naturally aspirated 91 0ctane pump gas K24 engine. Since the goal of our car is to build a subtle and stock looking car with outstanding performance, we now have to piece together a suspension for our car that gives great performance but is totally driveable in daily use with as few as possible annoying characteristics. If you want to see what we have done so far in total to our car you can check it out here.

One of the issues for building the suspension of the DC5 is that the handling in stock condition is pretty horrible. The DC5 shares most of the suspension parts and flaws of the much-maligned Honda EP3 Civic. The biggest issue is the horrible bumpsteer caused by the unbelievably poorly designed front steering geometry and an odd center tie rod attachment point for the steering rack.  You can see how we fixed some of this on our EP3 project.

 

Most of the time, when improving the handling of a car, the best starting point is a good set of coilovers.  Not too many companies make good coilover for this platform but we found that KW Suspension makes a set of Variant 2 single adjustable coilovers for the DC5 chassis.  The KW part number for these is 15251001.  The damping for the Variant 2 has a single adjuster on top of the shock shaft which affects mostly the low-speed rebound.   In order to keep things smooth and quiet, we opted to retain the stock Acura rubber isolated upper mounts and simply replaced our old parts with fresh genuine Acura parts. The front spring rate is 5 kg, up from the stock 3.2 kg.

Since we are going to be running the stock upper mounts instead of an adjustable camber plate, the KW front struts have a great feature. The upper strut to knuckle bolt is slotted and has an eccentric so camber can be adjusted at this lower point.

The steering arms are welded to the strut body which is in our opinion a good feature. Some other RSX struts have the steering arms on a threaded collar which can come loose and cause wandering due to toe change and screwed up Ackerman.

 

 

The rear shocks are also single adjustable. Like the front struts, we will be using the stock rubber isolated mounts. The rear spring rate is 9 kg up from the stock 5.3 kg.

10 comments

    1. Ok so I’m not sure what your ask but I can explain what a rsx is a Acura RDX is a American version if the Honda Integra Dc5 there the same car with different badging.
      Hope this helps

      1. No – I mean that in the sense of… Honda built some of the best handling FWD cars ever from the factory… and then they built this? It’s just astonishing that Honda, of all companies, went backwards like this.

    2. From what I understand, to save development costs the firewall and front suspension module were taken from some Japanese van thing. Hence the front suspension geometry that has no thought to anything other than to attach the wheels too! This and the EP3 have the worst bumpsteer of any modern car that I have ever driven.

      1. The steering rack is interesting though, in the sense of I can think of a use for it, on something weird enough where the control arm pivots nearly meet in the center. Metro 6R4 inspired thing, if I ever get crazy enough to build something like that.

      2. it shares the same suspension and steering as a honda element. having owned both an element and an rsx, i have to say they handle pretty similarly.

        in the element community, this was awesome as you could use similar components from a “sportier” vehicle on your crossover SUV.

        conversely, as an rsx owner, it’s kind of unfortunately that your sport compact car shares a lot of components with a crossover SUV.

  1. Has anyone tried to develop a mounting section that is longer so that the inner tie rod pivot location would be more outboard? This might result in too high of a torsional force on the rack center I suppose.

    1. Yes, actually the guys at SHG Motorsports did exactly that for their race car. They were able to get the toe change to under 1/8 for the entire suspension stroke.

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