And what spring rates are you at?Well, the Tractive suspension saga has finally got an outcome. The key figures are:
1/ The tractive shock has 124mm of piston travel from top of stroke to when it just kisses the bump rubber. The bumper rubber is 50mm long and progressive.
2/ When installed to tt suspension specifications the piston sits at 62mm of stroke (that is, mid travel).
3/ When installed as standard, the tractive coil over suspension seems to ride at 602mm, as opposed to 588mm standard. In other words, it is ~14mm higher than the standard front struts.
4/ There is a limited safe range by which the spring perch can be raised to raise the car. The limit is when the inverted strut is no longer supported by the third bearing. This happens at about 20mm raised from standard recommended perch height (i.e. 62mm mid travel for piston). If the strut is not supported by the third bearing it will fail. The safe raising limit is 10mm - no more!
5/ Lowering the perch height (i.e. moving the piston towards the bump rubber) is much safer. The limit is avoiding hard contact on the bump stops when riding ripple strips or compressions. Lowering by 15mm still leaves ~ 47mm bump travel before kissing the progressive bump stop. This is the figure I will be aiming for as an initial attempt.
So, we have made a 15mm spacer. This gives the following ride height figures when perch height is adjusted - having measured the bearings etc this should be safe but YMMV:
Track: 15mm spacer with perch height lowered 15mm from standard height. Net result = standard ride height as recommended for Tractive (which is ~14mm higher than ford standard).
Street/Gravel: 15mm spacer + 10mm lift = standard Tractive ride height + 25mm (which is 39mm higher than ford standard).
So the track configuration is what we will be running at the Whiteline tarmac rallysprint (17th November) check it out here, and the gravel configuration at the next Khanacross (15th). I'll report back on how much toe changes between the two settings. The initial take is to set toe for track use and live with what we get for gravel provided it is not too far out. If it is, it will be a matter of counting turns on the tie rod ends to adjust and checking with a measure.
I think 16 Ford Focus RS Grey
Eibach Sways /Catless Dp /Adamtuned Auxfuel Kit/ Cobb AdamTuned/ Dsc Sport Controller/ Radium PcV CC./K+N air filter /Tema 4x4 30mm spacer/e85/massive sway endlinks//
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