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MrDangerUS

Anti Roll Bar Stiffness

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Could anyone tell me what is the spring rate of Esprit17mm dia ARB ?

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Don't know, but you can stiffen it up a bit by using poly bushes in the two middle ones and the two on the sides.

Apart from that, a better suspension. SOme modern one, that can react differently on slow and fast input in the suspension travel.

 

Kind regards,

Jacques.

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I calculated it using  Fred Punh algorithm (pg 150 of his book "How to make your car handle")

The spring rate for 17.5mm ARB = ~ 140 lb/in

For 15 mm ARB =~ 85 lb/in

 

THEREFORE: I was able to fill the blank spots in this matrix.

 

OE LOTUS SPRINGS:

 

85/86/87/(and 88 Federal?)  http://esprit.driestone.com/index.php?pagename=Esprit.TechnicalData

 

 

(88 Federal ?), Non-SE 89: (17% anti-dive geometry),

Front: Rate– 22.8 N/mm / 130 Lb/in, Free Length–369mm (14.5”), Static Length– 203mm (10”), 585# preload, ride hgt 170mm

          Total With ARB= = 270 lbs/in

Rear: Rate– 27.5 N/mm / 157 Lb/in, Free Length–334mm (13.15”), Static Length– 205.7mm (8”), 808# preload, ride hgt 170mm

ARB: 17.5 mm dia. front anti-sway bar, confirmed! Rate: 140 lbs/in

 

89+ SE (22% pro-dive geometry)

Front: Rate– 29.1 N/mm /166 Lb/in, Free Length–372mm (14.6”), Static Length– 219mm (8.62”), 992# preload, ride hgt 190mm

          Total With ARB= 306lbs/in

Rear: Rate– 27.5 N/mm / 157 Lb/in, Free Length–347mm (13.7”), Static Length– 218mm (8.6”),  800# preload, ride hgt 170mm

ARB: 17.5 mm dia. front anti-sway bar Rate: 140 lbs/in

 

S4

Front: Rate – 36 N/mm / 205 Lb/in

          Total With ARB= 290 lbs/in

Rear:  Rate – 39 N/mm / 225  Lb/in

ARB: 15 mm dia,  Rate: 85 lbs/in

 

S4s

Front: Rate – 41 N/mm / 234 Lb/in, Free Length - N/A, Static Length– 214mm (8.43”) (From Jeremy Walton’s book “The official story”)

          Total With ARB= 319 lbs/in

Rear:  Rate – 45 N/mm / 257 Lb/in, Free Length - N/A, Static Length– 227mm (8.93”)

15 mm dia. front anti-sway bar, Rate: 85 lbs/in

 

The front damper platform height for each of these measurements is 59mm. The rear platform height is 115mm. The extended/compressed length for the front is 12in./10in., and the rear is 16in./12in.

 

Sport 300

Front: Rate – 43.2 N/mm / 280 Lb/mm

          Total With ARB= 365 lb/in

Rear:  Rate – 48.8 N/mm / 320 Lb/in

ARB: 15 mm dia, Rate: 85 lbs/in

Edited by MrDangerUS
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