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Triumph TR 2,3,3A and TR4
TR2,3 and 3A have similar front and rear suspension. The TR4 has wider track front and rear, and is the same front and rear suspension, except that the front suspension has some caster built in, vs zero caster for the earlier cars. The TR4 has a steering rack and pinion. TR2/3 have a steering box, although many have been converted to steering rack (see below).
You can't do the suspension set up on a car from a parts catalogue. Our TR set ups are developed in the Weight Transfer Worksheet (WTW), and tested in the the many TR suspension set ups we have done, both for road and racing. (see sidebar)
The TR suspension was designed around bias ply tyres. With such low grip tyres, the thinking behind critical handling issues was not fully developed. The latest radial ply tyres are the single biggest contributor to better handling, but only if the suspension is set to take advantage. Therefore whatever race or rally setups were used in the 60's and 70's will not be optimized - in fact, probably not even close. The theory hasn't changed, but there is greater understanding about the role of the tyre, as described in detail in the Technical Pages of this web site.
If you follow F1, or V8 supercars, you will be aware how important the set up is in professional racing. Likewise, our classic sports cars benefit from suspension set up technology.
Let us know your intended use for your car, and we will put together a suggested package.
Front (Prices incl. GST)
Coil Springs $330.00 pair
Shock Absorbers, gas pressure over oil. $200.00 pair.
Very reliable. two years warranty. Better performance, better ride than
a hydraulic oil only shock. The gas pressure helps the shock
consistency on the change of direction, bump to rebound.
Front Anti-Roll Bar Kit (ARB) $395.00
20mm or 22mm
Steering mods required OR use steering rack and pinion with ackerman and
bump steer correction, which we can advise on.
8mm main leaf, for spring pack
No longer available
Coil Springs and Front ARB
Springs and anti-roll bars determine the ride stiffness, or suspension frequency, and the degree of roll. The 300lb/in standard front coil spring already gives a firm "ride rate" compared to other sports cars and is a good choice for performance road cars.
But "roll rate" of the standard car, causes the car to be unbalanced - too much oversteer on modern tyres. We recommend a 20mm dia. ARB with the standard springs. Any road going TR will feel remarkably improved with this ARB. The 9/16 inch period anti-roll bar is way too soft to be of value.
For fantastic ride and handling in any road going performance TR2-4, fit the "soft ride" springs. Exclusive to Racing Car Technology. For a description of what these springs are all about, refer to the photo, top of the centre column, and caption, and below in this column.
We also have tarmac rally and race spec coil springs. For competition cars, we recommend to do a Weight Transfer Worksheet (WTW), as per the front page of this web site.
We recommend modified lower control arm spring plates (see picture). The cutout is important. It helps to be able to get the springs in and out of the car easily, so as to be able to adjust ride height.
Depending on the ride height of the vehicle it may be necessary to
adjust the spring seat angle (see picture). We have test data that shows excess
bending of the spring will increase spring stiffness up to 20%.
Refer the picture at the top of the page. This chassis is fitted with our softer than standard front springs (250 lb/in) and also used on Bill's TR shown at the right. These springs are always mated with our 22mm front anti-roll bar. The advantage of such a stiff anti-roll bar is that, as well as giving the car the right balance of oversteer/understeer, it gives better initial turn in. This is a characteristic of anti-roll bars that is not generally well known. The TR responds very well to the extra roll stiffness, and proves the theory in this regard.
There are no over the top modifications on this car. It is just a great balance of good power, handling and braking, with aftermarket seat and seat belt to keep the driver held while it's all happening.
There no dip, shake rattle or roll and the car tracks
flawlessly, with good ride quality. At the wheel, you get good
feedback from the road. It's a nice track day car. For
racing, it needs quicker response (stiffer springs and competition
shocks) and quick ratio steering rack.
Soft ride front coils can only be fitted if the lower control arms have been modified (see below).
The combination soft ride
coils, heavy duty anti-roll bar controlling roll, with Comfort Gas
shocks delivers unbelievable ride and handling for any
To order any TR parts and kits you see here, contact us
This is the cutout that allows the spring plate to swing down further, and allow easy coil spring removal. This is for TR2-4. TR5-6 do not have the same problem. The spring seat angle has been changed as well, so as to push the spring straighter. Our tests show that bending of the spring in the front suspension can add around 20% to spring stiffness.
Bill's TR in road trim, with chrome wires and Pirrelli P600 tyres. Car also has Compomotive alloys and 205 50 15 tyres to improve on track performance.
Steering and suspension geometry has been optimized along with our suspension components. The car has the "soft ride" front springs and our rear panhard bar. Engine power is increased - flowed cylinder head and spec camshaft, that allows high compression without pinging. Does require premium unleaded fuel.