How to Set Zero Preload on Coilovers 

FYI you are NOT increasing spring rate or stiffness with increased preload. You are just reducing droop travel. And you want to measure preload by measuring the spring, not the shock body. Also, with zero preload, a new spring will settle a bit after driving so you will end up with a lose spring and will have to adjust again and add some preload. This is why most coilover manufacturers recommend a very small amount of preload when installed new.

Spring rate only changes if you have a progressive spring not a linear spring. So adding 4mm of preload to the spring doesn't change that in your case. BC does that for sag or settling of the coil so that you dont lose preload and have it loose and rattling. Pretty standard setup.

Truly thanks

Good video buddy thanks learning for I will purchase first set of coils godspeed. Now it says for 10mm do I have to do 10mm or can I do it at 0 or should I do like 5 . Thanks buddy.

In my opinion ,this is the best best system of coilover sunspension.The lower and the spring "hardness" is is absolute independently of each other ,

The- preload is gone when lowering the car down on ground with them mounted. So "pre-load" adjustment would for final be to stop the down movement before the car slams the tarmac on speed bump. You can really preload those coilovers when you have the height adjustment on lower end. But the preload must be so tight that car stands on the ground with fully expanded shocks. It will get uncomfort dince the car can’t move upwards. And downwards are restricted much. On mine i have notised that rear coulovers are adjusted so it can’t touch the ground with load. Better with springs banging than bashing the car in the ground(as ling as upper shock mount handle it. But i have noticed some range problem in uneven roads. So i are going to check if there is more margin downwards to the ground. If it is already close enough i let it be that way. Driving normally might cause 1-3 bashes( bottoming) a year up in the shock mount. But 180-200kph can raise consentration levels and conserns on uneven roads. There should have been a stopper with a coenic shape absorbing the bottoming. I am going tho compare the measurements between the right and left side on my rear. Because its on the left side it bottoming in the spring. So im going to match the right side. So there are some more things to think about with those coilovers . But its better than groundslamming. Cars might have different groundclearance with same coiloveradjustments. Design/weight differences😊👍🏻

Video a little bid old, but tell me if I am right. For example I have bc racing coils aaaand for example my overall front spring lenght is 200mm. Bc racing says that preload is 4mm, after preload compressed spring lenght should be 196mm?

Does the shock have to be fully extended before hand tightening the ring?

Great video.. you couldn’t of explained it easier.. thanks

You are definitely a child of all ages. Hahahah. Happy to see ur channel growing man. But you gonna have to come visit Florida!!! And I’m definitely telling ur wife 😂

Alsome video thanks

does this also work on used coil overs? my friend gave me his set after having them for 3k+ miles and I noticed the spring were moving freely up and down on all fours, should I also adjust it or just leave it alone?

With Swift springs, you are NOT increasing spring rate when you compress the spring, that is literally the benefit of Swift, as they are not a progressive spring, they are a linear spring.

Bro just throw this whole video away🤣

Is it possible to but the bottom tread tube couple inches to get it lower rear ? My car sits to high in the rear, If I drop it without preloaded . It was way more bouncer

Thank you for this video. I think I'd use a high precision ruler instead of tape measure which is not accurate for precise measurements especially if we need only a few mm.

What does the preload do? If not dampening available, can the pre load AFFECT the ride?

Shaddap.

Thanks for the vid! This mirror setup is disturbing

U need a right amount of SAG. Each spring can be preloaded to certain extent above which u should change spring rate to higher one.