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Pajero Sport QE 2015 - 2019 The Pajero Sport new to Oz

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Old 6 Days Ago
xMAGNUMx xMAGNUMx is offline
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Default Rear suspension flex

Hey folks,

I've got a stock MY19 PS which serves as a family car and for weekend thrills. I'm trying to figure out how to get the best flex out of the rear suspension so I've done a lot of reading on here and have learned a lot (thanks!), but I haven't been able to find answers to all my questions.

First I took some measurements:
Rear EBH 550

Then I drove onto my homemade flex ramp:
Rear EBH at full compression 420 and rear shock 370
Rear EBH at full droop 690 and rear shock 465

I tried my best to ensure the EBH measurements on the flex ramp were accurate, but due to the circular motion of the rear axle under articulation they may be off by 10. Nevertheless, from what I understand, the OEM shocks travel range is 315 to 500. They are not being maxed out at either end based on my measurements.

Clearly MM have designed the rear suspension to avoid shock damage under compression and I noticed the axle was resting on the cone bump stop inside the rear coil under max compression. It is not my intention to increase up travel - I only want an increase in down travel. I measured the rear spring and on the long side it was 320 long at full droop. I understand OEM spring size is 380 so it's a long way from falling out.

So how do I get more flex out of the rear end? What is restricting down travel in the OEM setup? Is it the sway bar? I don't have a lift to measure the rear EBH when the car is lifted off the ground and the axle is level. This could help answer the question...
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The Pajero Sport rear suspension is identical to the PB/PC Challenger and I have spent a lot of time and money getting my rear suspension to do what I want it to do, which is to catrry heavy loads over rough tracks at speed and for extended periods of time.

The limiting factor in regard to down travel is firstly, spring rate to overcome the effect of the swaybar, if the sway bar is disconnected the you require lower spring rates. Then it is the shocker length, 525mm is the longest safest shocker length, Bilstein B6 are 530mm but unless you have low spring rates the coils can unseat off the lower coil pads. Then comes the brake line length, with Bilstiens the brake lines will go tight, so you need to fit extended length brake lines.

The limiting factor on compression are the articulation stops on the axles, even the replacement rubber cones springs that I recommend, which are longer and a greater spring rate, do not effect the compression travel.

OJ.
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2011 PB Base White Auto, Smartbar, Cooper STMaxx LT235/85R-16,TPMS, HR TB, 3 x Bushskinz, front +40mm Dobinson , rear +50mm EHDVR Lovells, Dobinson MT struts and shockers, Peddars 5899 cone springs, Windcheater rack, GME UHF, Custom alloy drawer system inc. 30lt Engel & 2 x 30 AH LiFePo batteries + elec controls, Tailgate hi-lift/long struts, Phillips +100 LB & HB, Lightforce 20" single row driving beam LED lightbar, Scanguage II.
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xMAGNUMx xMAGNUMx is offline
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Hmmm, cheers OJ. So get stronger springs to bend the sway bar. Then get longer shocks so they are not the limiting factor. Finally extend lines as required.

Based on what you've said, what would be a better pick: long linear springs (like the Dobinson C43-203 you've mentioned in another post) or a slightly shorter progressive one (like the KCRR-38)? Which one would provide better flex? I should note that I have no intention of loading up my PS for an outback trip anytime soon so load carrying ability is not part of my requirements.
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Quote:
Originally Posted by xMAGNUMx View Post
Hmmm, cheers OJ. So get stronger springs to bend the sway bar. Then get longer shocks so they are not the limiting factor. Finally extend lines as required.

Based on what you've said, what would be a better pick: long linear springs (like the Dobinson C43-203 you've mentioned in another post) or a slightly shorter progressive one (like the KCRR-38)? Which one would provide better flex? I should note that I have no intention of loading up my PS for an outback trip anytime soon so load carrying ability is not part of my requirements.
If you are not carrying any extra weight in the rear the a longer softer (lower spring rate) coils will give you more articulation if you disconnect the rear sway bar.

Some coil data to ponder over;

Factory 5 seater, 374mm free length, 2.36-3.54kg/mm spring rate.
Factory 7 seater, 380mm free length, 2.36-3.54kg/mm spring rate.
King KCRS-33, 375mm free length, 2.4 to 4.1kg/mm spring rate.
King KCRR-33, 395mm free length, 2.4 to 4.1kg/mm spring rate.
King KCRR-38, 400mm free length, 2.4 to 4.1kg/mm spring rate.
Dobinson C43-099, 385mm free length, 2.7kg/mm spring rate.
Dobinson C43-097, 405mm free length, 2.7kg/mm spring rate.
Dobinson C43-203, 425mm free length, 2.96kg/mm spring rate.

If you weigh your rear axle weight then I can do a comparison of calculated/predictive ride heights.

OJ.
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2011 PB Base White Auto, Smartbar, Cooper STMaxx LT235/85R-16,TPMS, HR TB, 3 x Bushskinz, front +40mm Dobinson , rear +50mm EHDVR Lovells, Dobinson MT struts and shockers, Peddars 5899 cone springs, Windcheater rack, GME UHF, Custom alloy drawer system inc. 30lt Engel & 2 x 30 AH LiFePo batteries + elec controls, Tailgate hi-lift/long struts, Phillips +100 LB & HB, Lightforce 20" single row driving beam LED lightbar, Scanguage II.
MM4x4 Auto Mate, Serial No 1 .
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