initial

X mm = 1 turn of Bilstein HD thread
What is X?

In regards to lowering the front of a 993 with Bilstein HD's (RoW M030). Lowering the spindles by one turn of the threads results in lowering the car by how many millimeters?

I'm looking to lower the front by 11mm and would like to be as close as possible on my first try.

PorscheDoc

Rule of thumb is about 2mm a turn.

axl911

There is also a difference between the front and rear. In my experience, 1 turn of the rear lowers the equivalent to 2 turns of the front.

initial

That's great. Thanks.

For the search engine:

1 Bilstein HD thread turn = approx 2 mm of height adjustment in the front

nine9six

This would indicate different thread pitches of the adjustment from front to rear...

If you know the thread pitch of the threads on the adjusting nut; one turn is equal to the distance in raising or lowering, depending on direction of the turn. (minus spring sag)

In SAE terms, if the thread pitch was 12; this indicates 12 threads per inch. If you devide 12 into 1000 (which are how many thousandths of an inch are in 1 inch) you get .0833. So one complete turn on an adjusting nut, on a 12 pitch thread, results in .0833 rise or lowering, depending on the direction of the one turn.

The same applies in metric terms for say a 1.0 thread pitch on an adjusting nut; or a 1.25 thread pitch on an adjusting nut...Only you're dealing in mm instead of inches.

In the quotes above, I'd venture to say its not so much, "rule of thumb" as it is the likelihood of a 2.0 thread pitch on a Bilstein HD adjuster.

HTH,

initial

If we want to get scientific, you would also need to factor in the angle of the shock as I dont think the shocks are installed at 90 degrees from the ground. If they were, I could of just used a caliper as I adjust the lock rings or base it on thread pitch.

911F1

Reviving this thread. So 1 turn on the Bilstein HD front equals 2mm. Does anyone know what the rear Bilstein HD one turn measurement is? Thanks

Tlaloc75

I did this recently and found it was easy to use a tape (like used to measure fabric when sewing) to measure the distance from bottom of threads to bottom of perch. Measure at start, move as much as you need, measure again and you get the delta. Was able to get a 10 mm change easy peasy.

911F1

I have a digital caliper. I'll measure the distance for one turn when I'm adjusting it. I have new rear toe links on the way. I figure I would find tune the height in the rear at the same time.

95_993

If anyone knows what thread is used, easy to calculate

uniquenamehere

So easy that you refuse to post the details?

95_993

Yup....because I don't know what the thread spec is.

Mike J

Just measure 10 threads with a caliper and calculate it ... best way. If changing the heights, mark the current position on the ring and then count the turns.

Cheers,

Mike

911F1

Delete

driveline

Mine are 1.5mm, a standard metric pitch. When i ordered new nuts from Bilstein that's what they were.