DAMPER CONVERSION KIT REAR TR4A-6
The RevingtonTR damper inside coil rear suspension set-up gives better spring control than the original arrangement resulting in greatly improved road holding. The dampers are adjustable to suit your own preferences and have a longer useful life. When fitted correctly the bump and rebound travel is the same as standard.
With the Dampers fitted inside the rear springs, ground clearance and wheel clearance is maintained ensuring no interference with the tyres under compression. This is the definitive kit - not to be confused with inferior set up's with brackets off the chassis or the inner bodywork.
There is no need to change the trailing arm (aluminium part) that supports the car as the system bolts to it. 6 holes are drilled through the trailing arm to support the damper brackets.
It is not necessary to dismantle the car In order to install the damper kit other than to remove the old springs and dampers. Revington TR recommend taking off the trailing arms though to make the job easier and to change the trailing arm bushings for new Superpro polyurethane ones. Order SPF0077K. The job takes a little time to complete but it is not a difficult job for a competent mechanic.
We are flattered by the constant stream of positive feed back we get from customers with this kit fitted, especially when fitted as part of our integrated suspension packages.
A limited amount of welding is required to the chassis to add strengthening gussets and top support plates to the spring turret. The lower bracket is secured to the trailing arm with nuts and screws.
The kit comprises 2 dampers with Superpro lower and upper joints and all brackets.
The Superpro Polyurethane Lower Joint makes this version of the kit ideal for road cars where owners are likely to only use their car for normal or 'sporting' road use. Superpro Polyurethane Lower Joints transmit little or no NVH (Noise, Vibration and Harshness).
See RTR3003RJ1K or RTR3003RJ2K for versions of this kit, which use a spherical bearing lower joint. These kits are more suited to owners who intend to use their cars for fast road, track day and/or competition use.
Four images of the various lower arrangements are attached. The two spherical bearing arrangements are similar to look at but differ in the quality and construction of the bearing itself.
·The original lever arm dampers are an old design, and almost certainly were carried through from TR2 to TR6 on cost grounds alone. Changing to telescopic dampers brings the ability to adjust the damper to suit individual driving style and all the technological benefits of a more modern design.
·The original lever arm dampers have a link arm with rubber joints at both ends. These rubber ends allow wheel movement before the damper comes into effect resulting in a bouncy ride. These links are eliminated when our telescopic damper conversion is installed.
·Lever arm dampers are prone to coming loose as the action of the lever twisting in the body applies constantly reversing loads on the mounting screws.
·By putting the damper inside the spring all the forces are right where they should be; coincidental with the spring the damper is trying to control. Anywhere else is a compromise.
·Revington TR developed this rear damper conversion in conjunction with a reputable damper supplier and specialist damper builder. The installation design was undertaken by Neil Revington whilst the damper design and all its internal valve setting was specified by the damper specialist who had the benefit of the use of our TR5 for several weeks of testing and fine tuning of the system.
·All other telescopic damper kits on the market utilise a damper sat inside the wheel arch. Some of the disadvantages of these systems are; -
Similar twisting motion as lever arms, when the brackets are bolted to the original mount.
The space taken by the damper in the upper wheel arch is often the same space required by the tyre on full bump, resulting in the tyre rubbing on the damper and brackets.
To our knowledge none of these kits have been designed with the dampers being specifically developed for the application, rather the dampers have been chosen from a catalogue as 'near enough'.
· With the dampers set inside the spring, the hole in the rear of the trailing arm is vacated. This is a convenient place to site the links of a rear anti roll bar kit. Revington TR has developed such a kit. See RTR3006K below.
Replacement Superpro bush kits are available top and bottom. Order SPF2495K to service the top of two dampers and SPF2335K to service the bottom of two dampers
As the damper now sits inside the springs and acts as a rebound stop, the damper determines the travel. The bump stop acting between the upper face of the trailing arm and the tower inside the wheelarch still acts as the bump stop.
These adjustable dampers can be set to control a standard spring right up to ones with a rate of 650lb however the damper kits in our range which incorporate higher quality/performance dampers (which cost more of course) will control higher rate springs better.
We received this comment from Mike Osborne in Australia.
Having bought the "thru spring S/a" kit for my TR4A, some years ago,I finally got it fitted this month. I left the job to a local garage while I was away on holiday! Anyway, I thought I should let you know just how good it has turned out, making the car much nicer and comfortable to drive here on some pretty ordinary Australian roads!
22nd September 2016