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Author Topic: Saggy Rear Suspension  (Read 1063 times)

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Pippin

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Saggy Rear Suspension
« on: 25 November 2008, 08:32:24 »

Hi All

Since having the LPG system fitted i have noticed that when going over some speed humps the mud flaps catch the floor and even when going round some corners...i was wondering if uprating the rear suspension would be a good idea and if anyone else had done it.....

What would be required to undertake this and is it something that i could possibly do myslef?

Look forward to your replies...
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feeutfo

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Re: Saggy Rear Suspension
« Reply #1 on: 25 November 2008, 09:49:07 »

Quote
Hi All

Since having the LPG system fitted i have noticed that when going over some speed humps the mud flaps catch the floor and even when going round some corners...i was wondering if uprating the rear suspension would be a good idea and if anyone else had done it.....

What would be required to undertake this and is it something that i could possibly do myslef?

Look forward to your replies...
Rear dampers are very easy to replace. Springs are more involved, but very doable, see the guides in maintenance section.
 Tbh im suprised the tank has made that much difference to the ride hight. What tank is it, 80 litre across/behind the back seats?

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Marks DTM Calib

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Re: Saggy Rear Suspension
« Reply #2 on: 25 November 2008, 10:02:20 »

Would be interesting to know how Martin Imber is getting on with his KYB gas adjusts?
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Martin_1962

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Re: Saggy Rear Suspension
« Reply #3 on: 25 November 2008, 10:39:27 »

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Would be interesting to know how Martin Imber is getting on with his KYB gas adjusts?


They are OK, don't seem to be that much better than good standard, but the car is a bit noisy when carrying adult rear passengers - could the shicks have bottomed out?

When the fronts are done I will be able to give a more detailed answer.

The drop was supposed to be 30mm - similar to tired and broken standard springs, but is nearer 40mm with the gas tank.

The car is about 5 to 10mm lower than with broken springs, but std fronts means the tow gear is pushed down by 10mm more than it should be.

They are stiffer, but slightly too low. Hence I want to see what the ride level is like with the fronts and if too low I will fit discs of steel 3-5mm roughly thick under the rubber mats on the trailing arms.

Getting WIMed during the Christmas break
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Pippin

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Re: Saggy Rear Suspension
« Reply #4 on: 25 November 2008, 11:19:59 »

It is an 80ltr tank, but i also have to carry loads of stuff for work too..... plus then when i've got the family in the back it's really low...
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Marks DTM Calib

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Re: Saggy Rear Suspension
« Reply #5 on: 25 November 2008, 11:25:14 »

Quote
Quote
Would be interesting to know how Martin Imber is getting on with his KYB gas adjusts?


They are OK, don't seem to be that much better than good standard, but the car is a bit noisy when carrying adult rear passengers - could the shicks have bottomed out?

When the fronts are done I will be able to give a more detailed answer.

The drop was supposed to be 30mm - similar to tired and broken standard springs, but is nearer 40mm with the gas tank.

The car is about 5 to 10mm lower than with broken springs, but std fronts means the tow gear is pushed down by 10mm more than it should be.

They are stiffer, but slightly too low. Hence I want to see what the ride level is like with the fronts and if too low I will fit discs of steel 3-5mm roughly thick under the rubber mats on the trailing arms.

Getting WIMed during the Christmas break

Ahhh...now I see the cause...

Your running a shock which is not ideal for use on a lowered spring setup.
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feeutfo

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Re: Saggy Rear Suspension
« Reply #6 on: 25 November 2008, 12:25:19 »

Quote
It is an 80ltr tank, but i also have to carry loads of stuff for work too..... plus then when i've got the family in the back it's really low...
Hmmm, asking a lot maybe? My geometry set up print out at home gives the ride hight setting. Ill have a look when i get in. But springs do sag and get tired with age, and they do brake the ends off quite  easily. Might be worth a check for breakages. You need to be thorough tho. They can be hard to spot. As said adjustable shocks are available.

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Martin_1962

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Re: Saggy Rear Suspension
« Reply #7 on: 25 November 2008, 13:23:04 »

Quote
Quote
Quote
Would be interesting to know how Martin Imber is getting on with his KYB gas adjusts?


They are OK, don't seem to be that much better than good standard, but the car is a bit noisy when carrying adult rear passengers - could the shicks have bottomed out?

When the fronts are done I will be able to give a more detailed answer.

The drop was supposed to be 30mm - similar to tired and broken standard springs, but is nearer 40mm with the gas tank.

The car is about 5 to 10mm lower than with broken springs, but std fronts means the tow gear is pushed down by 10mm more than it should be.

They are stiffer, but slightly too low. Hence I want to see what the ride level is like with the fronts and if too low I will fit discs of steel 3-5mm roughly thick under the rubber mats on the trailing arms.

Getting WIMed during the Christmas break

Ahhh...now I see the cause...

Your running a shock which is not ideal for use on a lowered spring setup.


I'll see how it as after a WIM visit - I have three outcomes

1) All OK
2) Shocks too long - Bylstein you said
3) Raise rear ride height slightly - with spacers - on rear arm.

They are stiffer, spring rate to me is fine, would be better for towing, but now I am not sure about shock length.

Jumping on towball - under 1" down rather than 2" or so from the originals. And I weigh more than 75kg
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Marks DTM Calib

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Re: Saggy Rear Suspension
« Reply #8 on: 25 November 2008, 13:51:19 »

I suspect that the Gas-A-Just shocks dont like the 30mm lowering.....hance they are not working with the springs and why you get a harsh ride (the springs wont be doing much)
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Martin_1962

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Re: Saggy Rear Suspension
« Reply #9 on: 25 November 2008, 15:35:01 »

Quote
I suspect that the Gas-A-Just shocks dont like the 30mm lowering.....hance they are not working with the springs and why you get a harsh ride (the springs wont be doing much)


Not harsh - just a bit noisy and was noisy with a rear passenger.

I haven't been able to bottom them out
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Martin_1962

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Re: Saggy Rear Suspension
« Reply #10 on: 27 November 2008, 11:04:10 »

OK I have tried everything but towing to bottom the back out - I haven't

hump back bridge - nope
One rear wheel on kerb and bounce on that corner - nope
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