Rake i.e. relative front and rear roll height
Discussion
Just had some new front shocks on my Tam and the handling on the drive home suggested the front is too low in relation to the rear. Measured sill to floor and got 125mm at the front and 135 mm at the rear (slight variance nearside/offside at rear of 3 mm with rear nearside measuring 138mm from sill to floor). As the rear sping/dampers are orginal this may be due to 15 years of extra weight from driver on the offside.
First off, does anyone know the desired rake and secondly what sort of tolerance is acceptable left / right across the axle?
First off, does anyone know the desired rake and secondly what sort of tolerance is acceptable left / right across the axle?
Ok late reply. They were protech, so I'm matching the rear. The spring/dampers units are turning up circa Friday at my Dads (proven mill pond flat, horizontal garage floor) and I'll fit them. In the meantime I've been running the fronts down a few clicks.
Apart from ride height, inputting an offside bias (front and rear) for driver weight and a suirable rake (14 - 15 mm across the length of the sills?) Is there anything else i can consider?
Ps probably going for horizontal across the axles
Apart from ride height, inputting an offside bias (front and rear) for driver weight and a suirable rake (14 - 15 mm across the length of the sills?) Is there anything else i can consider?
Ps probably going for horizontal across the axles
Ok after weeks of fettling I’ve gone for 5 5/16 - 5 3/4 taken from the sills (happy that the chassis out riggers are consistent with the fibreglass). Weighted the car with 55 kg on offside seat and 20kg on nearside (I weigh 75 kg).
Looks right and am happy with the relative roll heights and their effect on the balance front to rear (with 2 - 3 clicks difference on the dampers). Tried a smaller rake and was less happy with the front end in a straight line).
Exploring the dampers settings and am pleased that a supple rear gives better traction and not to much wobble under stress, even though it feels a "bit bouncy'. Surprised that hard settings are causing resonance if not by the tighter response at higher speeds on smoother roads.
The higher road height suggest earlier is useful (thanks guys) and allows me to contemplate two damper settings, having fitted the rear shocks with the damper dial facing outwards, adjustment is a pop; the front face inwards (hummmm, not sure a 180 will help).
The fundamental situational problem is urban living and open road driving (track time is infrequent).........however I'm loving the journey in all senses.
Ps got my first ever ticket, an SP70 the other day, used to pride myself on keeping my eyes open........I blame complacency due to sh*ty curtesy car....not my driving obviously
Looks right and am happy with the relative roll heights and their effect on the balance front to rear (with 2 - 3 clicks difference on the dampers). Tried a smaller rake and was less happy with the front end in a straight line).
Exploring the dampers settings and am pleased that a supple rear gives better traction and not to much wobble under stress, even though it feels a "bit bouncy'. Surprised that hard settings are causing resonance if not by the tighter response at higher speeds on smoother roads.
The higher road height suggest earlier is useful (thanks guys) and allows me to contemplate two damper settings, having fitted the rear shocks with the damper dial facing outwards, adjustment is a pop; the front face inwards (hummmm, not sure a 180 will help).
The fundamental situational problem is urban living and open road driving (track time is infrequent).........however I'm loving the journey in all senses.
Ps got my first ever ticket, an SP70 the other day, used to pride myself on keeping my eyes open........I blame complacency due to sh*ty curtesy car....not my driving obviously
Gassing Station | Tamora, T350 & Sagaris | Top of Page | What's New | My Stuff