[Nagz]

Has anyone got any info and or pic on how they extended there rear bump stops. I plan to extend the top plate that the bump stop hits. Is this correct?

WT sierra
2" body
2" spring
31's
and 1 inverted spring on the drivers side rear = massive lean

cheers guys

Pete

[JrZook]

Nagz wrote:

Has anyone got any info and or pic on how they extended there rear bump stops. I plan to extend the top plate that the bump stop hits. Is this correct?

WT sierra
2" body
2" spring
31's
and 1 inverted spring on the drivers side rear = massive lean

cheers guys

Pete

Yea some have done it by just tacking on a few pieces of RHS to the top plate. May I ask why you need these extensions on the rear? Im assuming you have issues with your shock lengths....

[Nagz]

im not really sure as to what shock are in the rear but i think they are commodore's and i dont want any more inverted rear spring.

[JrZook]

Nagz wrote:

im not really sure as to what shock are in the rear but i think they are commodore's and i dont want any more inverted rear spring.

What springs you runnign mate? Any pics of whats happening?

[31zook]

front


rear

[Nagz]

thats awesome, exactly what i needed.
I am running 2" lifted OME and if you for some reason you bounce when the wheel is at full compression it will invert and possible bent your spring.
sorry no pics i live in th city so i cant even got take some

[31zook]

sounds like your bushes are flogged out.....

[Gwagensteve]

Nagz wrote:

thats awesome, exactly what i needed.
I am running 2" lifted OME and if you for some reason you bounce when the wheel is at full compression it will invert and possible bent your spring.
sorry no pics i live in th city so i cant even got take some

Swap your springs left to right.

Adding bumpstop spacing isn't the right way of correcting this problem. All that will happen is you'll bottom out on the bumpstop all the time, which is not only uncomfortable, it's bad for handling.

You should have no need for bumpstop spacing for your setup. I'd agree, check the condition of the shackles, bushes and springs. The rear springs are designed to slightly invert when fully compressed.

Not being funny, are you really heavy? heavy drivers can exacerbate the sierra lean and the D/S rear spring will flog out more quickly.

After checking shackles and bushes, I'd try the left to right spring swap. If that doesn't work, you need new springs.

Steve.

[Nagz]

what bushes?

[Gwagensteve]

Spring and shackle bushes. As these wear you'll loose height.

Check the condition of the shackles - I've seen lots of them heavily worn and cracked. As they wear you loose ride height.

Steve.

[Nagz]

springs, bushes and shacles are only 2 and a bit yrs old and in onl 65kg lol feather weight lol. Its the rear spring thats definatly bent, its over an inch lower. the car has never been a daily and does about 6000km per yr it happend after a run at menai

[Gwagensteve]

Ah, now a bit more information - A bent spring is a bent spring. An inch low on the driver's side isn't unusual though- search "sierra lean"

I'd take both rear springs out and compare their free arch (or how much arch they have out of the car) If you actually have a bent spring, it needs replacement. If the driver's side spring doesn't have a noticeable kink or bend but does have less free arch than the passenger side, swap them over side to side.

I'll reiterate though - bumpstop spacers aren't a fix for this problem. The stock suspension design is sound and the springs cannot be damaged by overcompression with the bumpstops as they came from the factory.

Steve.

[JrZook]

Gwagensteve wrote:

Ah, now a bit more information - A bent spring is a bent spring. An inch low on the driver's side isn't unusual though- search "sierra lean"

I'd take both rear springs out and compare their free arch (or how much arch they have out of the car) If you actually have a bent spring, it needs replacement. If the driver's side spring doesn't have a noticeable kink or bend but does have less free arch than the passenger side, swap them over side to side.

I'll reiterate though - bumpstop spacers aren't a fix for this problem. The stock suspension design is sound and the springs cannot be damaged by overcompression with the bumpstops as they came from the factory.

Steve.

Yep!

[Nagz]

Gwagensteve wrote:

Ah, now a bit more information - A bent spring is a bent spring. An inch low on the driver's side isn't unusual though- search "sierra lean"

I'd take both rear springs out and compare their free arch (or how much arch they have out of the car) If you actually have a bent spring, it needs replacement. If the driver's side spring doesn't have a noticeable kink or bend but does have less free arch than the passenger side, swap them over side to side.

I'll reiterate though - bumpstop spacers aren't a fix for this problem. The stock suspension design is sound and the springs cannot be damaged by overcompression with the bumpstops as they came from the factory.

Steve.

but wouldnt that theory cancel out when you lift the car up and put bigger tyres on as they hit the guards well before the bumpstop hits, therefor wouldnt you need to extend them to have the "stock effect"

[SierraDan]

That's a different fix. He wants to stop his shackle inverting.

[Gwagensteve]

Nagz wrote:

but wouldnt that theory cancel out when you lift the car up and put bigger tyres on as they hit the guards well before the bumpstop hits, therefor wouldnt you need to extend them to have the "stock effect"

Correct, but that's a different problem. Bumpstop spacing is an important part of fitting larger tyres, but that's not a problem for you as your 2" body lift is allowing your 31's to clear.

Spacing the bumpstops, without changing anything else, reduces wheel travel by the height of the spacer, so you don't do it unless you have to.

Steve.

[Nagz]

SierraDan wrote:

That's a different fix. He wants to stop his shackle inverting.

No i dont.


And so what your saying is that extended bump stops are only for when you dont have enough lift.

[Teracis]

Nagz wrote:

SierraDan wrote:

That's a different fix. He wants to stop his shackle inverting.

No i dont.


And so what your saying is that extended bump stops are only for when you dont have enough lift.

The extended bump stops are for exactly what they say, extending the bump stop and therefore restricting upward movement by an amount equal to the added extension.

In other words, if you put a 50mm block in to extend your bump stops, it will hit the stop 50mm lower than it previously would, so yes you could use it when you don't have enough lift, but you are then lowering the upper limit of travel.