SakeBomb Garage

Can't give away every secret but yeah basically. Softer springs need a bit more compression travel than stiffer ones so they shift a bit towards more compression travel. Stiffer springs need less compression travel and as such get extra rebound travel. The rear DFV has 52mm of pre-bumpstop stroke and has 80mm of total available stroke.

SakeBomb Garage

That's the goal! We love helping out the community with setup advice but if we spent enough time to answer all the questions we are asked we wouldn't have time to make cool parts. We figured this was the best way to help the most people as efficiently as possible.

SakeBomb Garage

Based on this graph bumpstop contact happens at 1.24" of drop. So if you look at a given cell, 1.24 - (the cells magnitude) is the pre-bumpstop compression stroke available at the wheel. Damper travel is 0.6 * wheel travel.

S2000_916

dang sounds like awfully short amount of travel.

andrewhake

As Sakebomb mentioned above: "Damper travel is 0.6 * wheel travel." So important to keep that in mind. With the car lower (and the wheel/tire moved more into the wheel well) you can only get so much wheel travel before the tire comes into contact with the body. You definitely don't want your tire to be your bump stop.

circuitclub

SBG - thanks for the informative posts. Just to clarify, the green boxes and "maximum ride height change" inside each cell is limited by Ohlins lower damper mount and spring length correct? I am saying this because, I would expect a higher rated spring would reduce damper travel (while also reducing static compression) and therefore allow an overall lower ride height. Therefore, a large benefit of stiffer springs is the ability to be set the car at a lower static height. Correct?

SakeBomb Garage

Yes the values are the lowest the damper is capable of going. In general the stiffer your springs the lower you are safe to go because there is less vertical movement due to the stiffer ride. However because the spring compresses less from the weight of the car the ride height on stiffer springs cannot be lowered as much for a given set of hardware. This is were our billet lower mount comes into play, because the design is more compact you re-gain the adjustment that is required.

flanders

Would stiffer sway bars affect the recommended preload?
I'm going to try and ad some since I'm only at 2mm with the 8kg rear springs.
But I also got Tanabe sways front and rear which I think are a lot stiffer than stock and I'm thinking this should have some affect as well.

SakeBomb Garage

It will have some effect while cornering but pretty minimal effect while driving in a straight line.

andrewhake

Yep definitely. But the spring rate and ability to adjust ride height to a specific point needs to be considered as well. On my car with 13kg/mm springs F + R I am just able to get to the rear ride height I was after, because I also have 12mm J's Racing rear roll center adjusters, which offset the knuckle up 12mm (which also lowers the ride height). If I was running stiffer springs like 16kg/mm or so and wanted to achieve the same ride height, I would height more roll center adjustment or lower mounts like this that allow for more ride height adjustment. 13kg/mm springs work very well for me with my setup. I have them at just a little more than 0mm preload and the compression travel is more than acceptable.