Eoin611
New member
I'm looking for advice or opinion on suitable spring rates for a motorsport destined X1/9. I've gone through any existing threads, some of which include input from myself several years ago regarding my last VTEC X1/9 and trawled through various other sites but can't seem to find information regarding standard production spring rates or suggestions for what might work best for racing. My last X1/9 ran with 160lb in front and 350lb at the rear and handled reasonably well, (felt a little soft in front though) I'm now using a Punto 1242 16valve engine and plan to install 250lb at the rear and 160lb again in front. My logic is that the reduced speed and weight of the 1242 engine compared to the 2.2 Honda will result in less stress under braking and so I conclude that the 160lb springs should be sufficient this time around. Trial and error will no doubt play a part so I'm hoping to use the Forum as a sounding board and hope somebody out there has ideas or suggestions that could help. Using X1/9 Konis in front and Group 4 Bilsteins at the rear, simply because they were in the shed and could be made to fit.