Hmm! suspension eh!. shockers and the settings have a lot to do with it. I am also about to query the roll bars that I bought, these are alloy and claim to be 35% stiffer!!
My calcs tell me the opposite. after all the alloy has a much lower shear modulus than steel, so although slightly bigger in diameter they will lift the opposite wheel in cornering with less force. The suspension then becomes more independent and therefore more even footed.
I may be wrong on these calcs so interesting to see what anyone else thinks. but if correct my car used to skip about on one particular high speed bend and with the softer dampers and alloy roll bars now goes round with ease and comfort…
I have konis on the front, adjusted 1 turn off soft and am about to fit the same on the rear.
Everyone said that these bars give better performance but it may not be that they are stiffer, it may be they less stiff and the independence of the suspension is the gain.
Roger
Original front bar 21mm o/d 2mm wall steel tube. now 22mm 7000 series alloy solid Note change it is actually a 2.5mm wall steel tube
My car, a Eunos 1.6 RS Roadster had roll bar fitted across the engine, as standard as far as I can make out, and my car drives around corners especially as if it was on rails. Never taken it off to see what the difference would be if it wasn’t fitted tho’.
Funny place for a rollbar. Usually, there is a shock tower brace across the engine bay, but never a roll bar Also no such thing as a 1.6 RS. Your car looks all the world to be an S-Special, which means (essentially) STB, Bilsteins and matched springs (10mm lower), modified track rod ends to correct the steering geometry, 14" BBS. And a front ARB that is 1mm thicker than stock.
OP is referring to Anti-Roll Bars. Other use of the term “roll bar” refers to the things fitted in the cockpit to stop your head from being slimed in the event of turning the car over.
Come on guys…its not about words…you know what I am talking about…has anyone done the numbers?? can anyone do the numbers?? its not hard but it would be nice to have confirmation…
You have both bars you need to compare so get them on the bench and clamp one end and hang a big weight on the other end and then measure the deflection. The more deflection per weight equals softer.
Hi M Mac
Yes afraid the new ones are on the car and their not coming off!
Your right though thats the way to test them.
I had to do it by calculation assuming a length and a load I took 800mm long and a 20kgm load and used a standard torque tube calc.
Thats why I posted the dimensions, twist in this case was front Hollow steel original 9.5 deg. solid alloy new one 15.5 deg. solid steel rear 34 degrees, solid alloy new 42 deg.
Alloy has shear modulus of 26.79 Gpa and steel 79.3 Gpa. Alloy is a lot more flexible.
R
Ah and just for ref and for SAZ9961
I Have a MK3 2006 with Kumos and Konis all round. standard springs as the roads in devon have grass growing down the middle and big ditches down the side!!