Hey everyone,
I thought this plot deserved to have its own thread to get more exposure and to show everyone the IFS leverage ratio at work.
The plot below shows lift (inches) vs droop for struts with different open lengths.
The dashed lines have been created by using the leverage ratio of 1:2.12 (measured on my Prado). As such, a 10mm increase in strut open length translates to 21.2mm increase in droop. I've assumed that the coil seat location doesn't change between different struts, which I cannot presently confirm. If the seat position does change, then this will change the coil pre-load and the resultant lift, however, I don't think there will be much difference in seat position, perhaps only a few mm.
These lines are also for factory UCA's only, which will typically contact a coil at full droop on long struts. Using after market UCA's will improve the droop, and on fully open 570mm struts, you may get very close to binding the CV.
The solid circles are real lift and droop data points measured from different struts.
As the most popular lift is typically 2", to maintain a minimum droop of 60mm, you need to run a strut with open length of 558mm.
I personally believe the widely quoted figure of minimum 60mm droop is misleading, as I can get my short open length 712 struts to top out on roundabouts/speedbumps with 75mm droop at 1" lift.
To maintain close to 75mm droop at 2" lift, you need to run around a 564mm strut. The OEM strut/coil has 95mm droop at 0" lift at 750mm ride height.
Best
Mark
I thought this plot deserved to have its own thread to get more exposure and to show everyone the IFS leverage ratio at work.
The plot below shows lift (inches) vs droop for struts with different open lengths.
The dashed lines have been created by using the leverage ratio of 1:2.12 (measured on my Prado). As such, a 10mm increase in strut open length translates to 21.2mm increase in droop. I've assumed that the coil seat location doesn't change between different struts, which I cannot presently confirm. If the seat position does change, then this will change the coil pre-load and the resultant lift, however, I don't think there will be much difference in seat position, perhaps only a few mm.
These lines are also for factory UCA's only, which will typically contact a coil at full droop on long struts. Using after market UCA's will improve the droop, and on fully open 570mm struts, you may get very close to binding the CV.
The solid circles are real lift and droop data points measured from different struts.
As the most popular lift is typically 2", to maintain a minimum droop of 60mm, you need to run a strut with open length of 558mm.
I personally believe the widely quoted figure of minimum 60mm droop is misleading, as I can get my short open length 712 struts to top out on roundabouts/speedbumps with 75mm droop at 1" lift.
To maintain close to 75mm droop at 2" lift, you need to run around a 564mm strut. The OEM strut/coil has 95mm droop at 0" lift at 750mm ride height.
Best
Mark
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