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Unless you are driving on or close to the limit (and i'm not discussing a speed limit here) a rear ARB makes little difference.
On a standard car, (Sprint or 1850) the rear bar is there to promote understeer under normal fast road conditions. Your original 1500 didn't have one for the simple reason that it wasn't considered powerful enough to need help controlling oversteer!
The race boys in the 70s deleted the rear bar (or replaced it with a bit of wire for homologation purposes) because they WANTED the cars to oversteer more!
You are now messing about with power output, weight distribution, spring rates, shox, geometry, etc, all of which have only semi predictable effects on handling. My advice to you is to try it both ways and see which YOU prefer! On the limit handling is very subjective, what suits you may not suit me and vice-versa. I've fitted and kept a rear bar on the Carledo because I prefer it with one. But I am not you, and the Carledo with its Vauxhall powerplant and only 2 doors is not even similar in setup to your 4 door Dolomite body. There is NO recieved wisdom here, it's all down to personal preference. And it's not exactly difficult or time consuming to remove it/refit it to try both choices! But leave the trial until you have finalised the rest of the suspension setup!
Steve
From what I have generally read about understeer and oversteer characteristics, DECREASING the stiffness of a FRONT anti-roll bar and/or INCREASING the stiffness of REAR anti-roll bar, has the effect of INCREASING oversteer or DECREASING understeer!?!
That said, when I retro-fitted just a Dolomite Sprint rear anti-roll bar to my 1974 Triumph Toledo 1300 (Cosmic alloy wheels, with 21 mm offset and 175 SR13 Kelly-Springfield tyres), I did not notice any adverse affects on the steering characteristics when negotiating tight bends. I later retro-fitted a Dolomite Sprint front anti-roll bar and decambered the front wheels by removing the upper wishbone-bracket spacers; again with no adverse affects on the steering characteristics or tyre wear.
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Regards.
Nigel A. Skeet
Independent tutor of mathematics, physics, technology & engineering, for secondary, tertiary, further & higher education.
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Upgraded 1974 Triumph Toledo 1300 (Toledo / Dolomite HL / Sprint hybrid)
Onetime member + magazine editor & technical editor of Volkswagen Type 2 Owners' Club