: [1] 2   
: Measuring for new shocks after lift.  ( 8751 )
Pierre Bester
All Bezels
Sr. Member
****
Offline Offline

: 365


« : October 05, 2009, 05:15:18 PM »

So, Stompie was fitted (Theo forced me.... and helped) with new HC springs and the lift was between 50-65mm. 8) We immediately saw the old shocks were to short and after I put her on a cross axle obstacle it was clear the travel is not what it should be.

After some discussion on Skype it was clear that there is more than one opinion on how to measure the new shocks.

- Do you remove the bump stop before measuring?
- Does the opposite wheel still travel downward after the BS is reached?
...............................

Jonathan Tee
Administrator
Hero Member
*****
Offline Offline

: 2073


V8 because some say "2 heads are better than one"


« #1 : October 06, 2009, 08:16:28 AM »

1. Yes I would  ;)
2. Yes there could be - the bump stop should act as a pivot point, also provided the movement is not hampered by the wheel (tyre and rim) on the compressed side, rubbing the inside of the fender.

One thing to note that to get the maximum from aftermarket suspension lift, and to be able to fit a damper with the longest usable stroke, one should ideally lengthen the stock shock towers.

Jonathan Tee
Administrator
Hero Member
*****
Offline Offline

: 2073


V8 because some say "2 heads are better than one"


« #2 : October 06, 2009, 11:10:20 AM »

On mud someone said:
Quote
The only way to be sure is to measure your own ride. No one else can answer this for you. To measure for shocks, do the following:

1. Remove your shocks. Make sure nothing is hanging up your suspension like brake lines.
2. Jack up opposite corners of your rig (i.e. right front and left rear) as far as they will go. Compress the suspension fully.
3. Measure the eye to eye distance on both the front and rear. This is your compressed length.
4. Drop the rig back to the ground.
5. Place jack under the frame and lift up the front until the tire comes off the ground.
6. Measure eye to eye. This is the extended length for the front.
7. Repeat 5 & 6 for the rear.
8. Call your favorite shock manufacturer and give them your numbers. They can recommend the right shock. You can also look up the measurments on the internet for some manufacturers. Remember that you want a shock with a slightly shorter compressed length and a slightly longer extended length than what you measure.

Pierre Bester
All Bezels
Sr. Member
****
Offline Offline

: 365


« #3 : October 06, 2009, 03:25:06 PM »

5.?????
Where under the frame? As close as possible to the tyre you are lifting?

Jonathan Tee
Administrator
Hero Member
*****
Offline Offline

: 2073


V8 because some say "2 heads are better than one"


« #4 : October 06, 2009, 03:57:43 PM »

Shouldn't matter, on the bumper ;)

Keith Richardson
All Bezels
Hero Member
*****
Offline Offline

: 824


40's Rule


« #5 : October 06, 2009, 09:48:39 PM »

Use a high lift jack or you wont be able to get it high enough

FJ40-1979 TARSUXGP
FZJ105-1999-TOY100GP
FJ40-1983-LX-ELLEX
FJ Cruiser 2011 BM81KT-GP
KTM 1190 Adv
Ducati Multistrada 1200
KTM 990 SMT
MV Agusta Brutale 920
Kawasaki Z1000J ELR
Honda CB900F

Grahame Burchell
All Bezels
Hero Member
*****
Offline Offline

: 665



« #6 : November 04, 2009, 06:34:27 AM »

Hi guys, If I fitted brand new HC's would it not be better to let them settle down a bit before I check the shock lenghts. In other words would it not be better to say take the 40 to AD for a little work out, (bearing in mind I have std shocks fitted) and then do the measuring after. That way the springs may have settled a bit and then retighten the U bolts - which could also make a diff. Or would the diff be minimal?

Keith Richardson
All Bezels
Hero Member
*****
Offline Offline

: 824


40's Rule


« #7 : November 04, 2009, 10:31:51 AM »

Grahame

Chances are the standard shocks will be too short for the lifted vehicle and you stand a good chance of damaging them completely on articulation (not compression only on rebound)

FJ40-1979 TARSUXGP
FZJ105-1999-TOY100GP
FJ40-1983-LX-ELLEX
FJ Cruiser 2011 BM81KT-GP
KTM 1190 Adv
Ducati Multistrada 1200
KTM 990 SMT
MV Agusta Brutale 920
Kawasaki Z1000J ELR
Honda CB900F

Pierre Bester
All Bezels
Sr. Member
****
Offline Offline

: 365


« #8 : December 06, 2009, 10:41:04 PM »

So, I removed all 4 (too short) shocks and put the car in a cross axle. I little pressure on the right of the front bumper lifted the left rear wheel off the ground. I guess this could be called fully extended on the one side while fully compressed on the opposite side. The bump stops never came into play and yes I was not happy with the articulation at the back. :(

The measurements (eye to eye) was:
Front: Min - 395mm and max - 545mm
Rear: Min - 545mm and max - 586mm

The car was unloaded. How much do I allow for load?

How many mm do I add to the travel for safety when ordering shocks?

The shocks I removed were Monroe; Front 15-1590     D30AP078, Rear 15-1592    D 29MR07A.



I measured the rear shocks travel (340 compressed to 565 extended) and wondered if it could be used for the front. ???

One thing is for sure. The breather pipes need to be extended. :o

Oh yes, I was able to drive out of the obstacle without the help of a winch!! :jt:

Jonathan Tee
Administrator
Hero Member
*****
Offline Offline

: 2073


V8 because some say "2 heads are better than one"


« #9 : December 07, 2009, 09:04:20 AM »

I would load and measure rear again, 40mm is not enough  :o

You could use something like a OME N89 or N42 in the front... Max-594 Min-359 Stroke-235   
« : December 07, 2009, 09:10:24 AM Jonathan Tee »

Theo Marx
All Bezels
Hero Member
*****
Offline Offline

: 1718



« #10 : December 07, 2009, 09:22:55 AM »


You could use something like a OME N89 or N42 in the front

Or rather N30 that were designed for a vehicle which weighs about the same as a 40   ;)
« : December 07, 2009, 09:32:18 AM Theo Marx »

11/83  UZJ 42 LX with some goodies :  Olive
06/99  HZJ 75 RV

Jonathan Tee
Administrator
Hero Member
*****
Offline Offline

: 2073


V8 because some say "2 heads are better than one"


« #11 : December 07, 2009, 09:33:43 AM »

overkill for 2.5" of lift with max-618 min-368 stroke-250

 PB - max-545, min-395, stroke-150, midpoint-470
N89 - max-594, min-359, stroke-235, midpoint-431.5, unused travel-85
N30 - max-618, min-368, stroke-250, midpoint-493, unused travel-100

Quote
The bump stops never came into play
this part worries me, without shocks you should be able to touch the bump stops.

Jonathan Tee
Administrator
Hero Member
*****
Offline Offline

: 2073


V8 because some say "2 heads are better than one"


« #12 : December 07, 2009, 09:35:36 AM »

designed for a vehicle which weighs about the same as a 40   ;)

The rear of a Mistu pickup?

Theo Marx
All Bezels
Hero Member
*****
Offline Offline

: 1718



« #13 : December 07, 2009, 09:42:51 AM »

Yep, much better than that of a F250  ;D

11/83  UZJ 42 LX with some goodies :  Olive
06/99  HZJ 75 RV

Theo Marx
All Bezels
Hero Member
*****
Offline Offline

: 1718



« #14 : December 07, 2009, 09:46:16 AM »

overkill for 2.5" of lift with max-618 min-368 stroke-250

 PB - max-545, min-395, stroke-150, midpoint-470
N89 - max-594, min-359, stroke-235, midpoint-431.5, unused travel-85
N30 - max-618, min-368, stroke-250, midpoint-493, unused travel-100
 this part worries me, without shocks you should be able to touch the bump stops.


yet the diff in Max & Min between the 2 shocks is almost nuffing and the price is the same  ::) For the same price I would rather overkill than underkill while getting a more comfortable shock at the same time  ;D
« : December 07, 2009, 09:48:31 AM Theo Marx »

11/83  UZJ 42 LX with some goodies :  Olive
06/99  HZJ 75 RV

: [1] 2   
 
: