The thread where I ask dumb questions v. suspension - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Suspension, Brakes, Drivetrain discuss the wondrous effects of boost and your miata...

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 01-15-2010, 06:52 PM   #1
Ben
Supporting Vendor
Thread Starter
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default The thread where I ask dumb questions v. suspension

Assuming one were installing Tein Flex on an NB tomorrow, and further assuming that one has no practical experience adjusting coilovers...

This is the procedure I understand. Install assemblies. Set ride height by unlocking low collar and spinning assembly. Compress wheel into fender. Lengthen shock to no contact + 3 turns.

Next is adjust rear preload. Preload both raises ride height and increases bump travel, yes? It does this by limiting droop travel, yes? I adjust preload by measuring hub to fender with wheel on ground and subtracting that from hub to fender with wheel at full droop. What is the magic value, or range of values I'm looking for? I see the number 1.5" for the rears being thrown around.

Should turn out in the range of 12.25F 12.75R. Should be rake of .5-.75".

Assume NB, Tein twin-Flex, standard rate springs.
Shoot me some pointers, and make me less lost. KTHXBYE
Ben is offline   Reply With Quote
Old 01-15-2010, 07:30 PM   #2
Ben
Supporting Vendor
Thread Starter
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

Set front shock length with steering wheel turned. Measure rear exposed shock shaft. Add preload to front spring until exposed shock shaft is 90% of rear.

Verify rake. Adjust shock length as necessary.

At some point, corner weight car by adjusting preload only.
Ben is offline   Reply With Quote
Old 01-15-2010, 07:57 PM   #3
Elite Member
 
Join Date: Jul 2005
Posts: 6,454
Total Cats: 80
Default

Set rear "preload" (perch setting) as follows:
Difference in "ride height" between car at rest, and if you lift the rear by the diff and put the wheels in the air, needs to be 1.25 ~ 1.6". Any more, and you have too little bump travel.
JasonC SBB is offline   Reply With Quote
Old 01-15-2010, 09:48 PM   #4
Ben
Supporting Vendor
Thread Starter
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

Thank you, I understand.

Adjust out the rears to ~1.4", set front exposed shock shaft to 90% of rear, and then raise front ride height to ~.5" rake. That's it (for a good base set up), right? This should result in minimum ride height, and hopefully keep me out of the bumpstops.
Not bad.
Ben is offline   Reply With Quote
Old 01-16-2010, 03:07 AM   #5
Elite Member
 
Join Date: Jul 2005
Posts: 6,454
Total Cats: 80
Default

Yes that's a good procedure.
You can then lower the front and rear via the shock length, until your tires hit the fender liners on midcorner bumps.
JasonC SBB is offline   Reply With Quote
Old 01-17-2010, 12:20 AM   #6
Ben
Supporting Vendor
Thread Starter
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

Thanks for the guidance Jason.

Installed new shock on all 4 corners on an Altima. Owner could have purchased all 4 corners as complete assemblies for $100 more, but no, he purchased just the shocks and hats for the front. So we had to build them all up with the springs and small parts from the old assembles. Oh, and yeah by the way, he also needed a new axle, tie rod ends, and a sway end link. BTW, to do rear suspension on an Altima, you have to pull rear interior out... So that only took 8 hours.

After that, I wasn't fresh enough to really deal with the Flex. They're in there. They're not set up perfectly, but they're close. It's raining, so I couldn't really test them too much.

However I did immediately notice that they are firmer than the SS. I did not notice how much bump steer I used to have with the SS--I did however notice the absense of bump steer with the Flex now. They also feel much tighter than the Flex. I assume it's do to the better top hats, because there is also a little bit more noise.

Bad:
I twisted all 4 adjusters clockwise to full firm and backed off to the first click. Worked pefect on 3 of them. On the 4th, when I went to back of CCW past the first click, the knurled adjuster **** thing actually unthreaded from the shock.
Is this a real problem? Reinstall with loctite and be merry? Or is it time for a warm bath and razorblades?
Ben is offline   Reply With Quote
Old 01-17-2010, 02:13 PM   #7
Elite Member
 
Join Date: Jul 2005
Posts: 6,454
Total Cats: 80
Default

Dunno about the loosening ****.

Flexes tend to work best at or near full soft, assuming you're not sitting on the bumpstops.
JasonC SBB is offline   Reply With Quote
Old 01-17-2010, 10:24 PM   #8
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,037
Total Cats: 406
Default

+1 on running the flex full soft with the 7/6 rates or thereabout.
y8s is offline   Reply With Quote
Old 01-18-2010, 12:47 PM   #9
Ben
Supporting Vendor
Thread Starter
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

World is saved.

Called Tein's brand new service facility in Norcross GA (less than a half hour from my house ). The click adjuster can become dislodged with vibration. This is rare, but can happen. The Tein guy told me to reinstall and tighten up the little 8mm hex nut (under the knurled ****) with a wrench and see what happens. I honestly didn't even notice there was a hex nut below the knurled **** because the **** has a larger OD than the nut. He stayed on the phone with me while I did it. The adjuster is now in place, and I dialed down all 4 corners. He said if that didn't work, I could try swapping adjusters between the sides and/or go to their new facility and just pick up a new click adjuster. But it did work, so I'm done. Happy camper I am.

It is supposed to be beautiful tomorrow, so I'll take it for a ride then.
Ben is offline   Reply With Quote
Old 01-20-2010, 09:48 AM   #10
Ben
Supporting Vendor
Thread Starter
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

Wow these Flex make the car feel much more solid and connected. Definite increase in NVH, but the car feels much more stable whipping around a 30 mph clover leaf at 80.

Double edged sword though. So far, they're also harsher to live with and stiff. I'm at 8F 11R (clicks CCW from full stiff). I will try a softer setting next time I drive.
Ben is offline   Reply With Quote
Old 01-20-2010, 12:51 PM   #11
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,037
Total Cats: 406
Default

full soft ben!
y8s is offline   Reply With Quote
Old 01-20-2010, 12:56 PM   #12
Ben
Supporting Vendor
Thread Starter
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

I hear ya. I'll give it a shot.
Ben is offline   Reply With Quote
Old 01-20-2010, 12:56 PM   #13
Senior Member
iTrader: (3)
 
Join Date: Apr 2006
Location: Northern Michigan
Posts: 898
Total Cats: 0
Default

Thanks for asking, I just ordered my twin tube flex a minute ago. Very excited.
rotaryjunky is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1994 Spec Miata Race Car SM/SM2/SSM For Sale Quinn Cars for sale/trade 6 10-23-2016 08:58 AM
96 montego blue nOOb from Milwaukee Squiblez Meet and Greet 1 09-23-2015 02:50 AM
Suspension difference(s) between NA and NB d k Race Prep 11 09-09-2015 06:12 PM
I need some suggestions with Teins Rafa Suspension, Brakes, Drivetrain 21 03-15-2009 01:20 AM
Some suspension noise and clutch hydaulics questions NA6C-Guy Suspension, Brakes, Drivetrain 2 02-22-2009 04:44 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 10:26 PM.