Post by vtR1k on Mar 12, 2012 8:02:48 GMT
During my testdrive I found out that the rear of my tR1ke is much too low. At the front I have about 12 cm play but at the rear it is about 11 cm and about 4 cm with only me and with a passenger it is 1 cm or so. Needless to say I already scraped the powdercoating off at the rear...
So, I must raise it a lot and I only can raise it about 3 cm max, because the swingarm touches the frame if raised higher.
Next step is to mount a harder spring. The one installed has a spring rate of 83,4 N/mm.
Do I understand correct if I say:
83,4 N/mm and the maximum load is inside = 10 cm stroke.
If I want about 3 cm stroke, with the maximum load, can I say that 10/3=3.333 so the new hardness must be 83,4*3,333= approx. 280 N/mm max?
According to this calculation at the end I should have a free play of 3 cm extra for mounting the absorber on another point = 14 cm with no load.
With max load, the vehicle will drop for 3 cm again, this will come to 11 cm.
Because the spring preload is adustible, I think a spring somewhere between 170 (approx 5 cm stoke) and 280 (approx 3 cm stroke) should be sufficient. If I mount a 170N/mm spring, I can always adjust it, I suppose.
The front will still be higher and for aerodynamics this is unwanted. At higher speeds the air underneath will create an overpressure, which can cause the front to lift. For a light vehicle like the tR1ke, I think this effect can be felt really good. This is why all the racing cars have a diffuser at the rear, to make sure the air can flow freely away, causing a sucking effect called downforce. The way my tR1ke is set up, I only have upforce...
So, once I raised the rear, I also have to adjust the front to make sure the vehicle is as parallel to the road as possible, with the driver inside.
This is all theoretical which I reasoned myself. Does anybody know more about this?
So, I must raise it a lot and I only can raise it about 3 cm max, because the swingarm touches the frame if raised higher.
Next step is to mount a harder spring. The one installed has a spring rate of 83,4 N/mm.
Do I understand correct if I say:
83,4 N/mm and the maximum load is inside = 10 cm stroke.
If I want about 3 cm stroke, with the maximum load, can I say that 10/3=3.333 so the new hardness must be 83,4*3,333= approx. 280 N/mm max?
According to this calculation at the end I should have a free play of 3 cm extra for mounting the absorber on another point = 14 cm with no load.
With max load, the vehicle will drop for 3 cm again, this will come to 11 cm.
Because the spring preload is adustible, I think a spring somewhere between 170 (approx 5 cm stoke) and 280 (approx 3 cm stroke) should be sufficient. If I mount a 170N/mm spring, I can always adjust it, I suppose.
The front will still be higher and for aerodynamics this is unwanted. At higher speeds the air underneath will create an overpressure, which can cause the front to lift. For a light vehicle like the tR1ke, I think this effect can be felt really good. This is why all the racing cars have a diffuser at the rear, to make sure the air can flow freely away, causing a sucking effect called downforce. The way my tR1ke is set up, I only have upforce...
So, once I raised the rear, I also have to adjust the front to make sure the vehicle is as parallel to the road as possible, with the driver inside.
This is all theoretical which I reasoned myself. Does anybody know more about this?
