i have OME light/medium springs
rears: CSO38R x2 using OME013 Shocks (they are long enuf fully open/cl)
front: CSO12FA+B thinking of using OME027(490mm open 297mm close)
i was recommended OME015 for the front but they are not long enough when the springs are fully open. (470mm fully open)
what OME shocks have ppl used with the above springs.
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Which OME shocks to use with OME leaf springs
How are you generating the figure of 490mm "open length" for your springs?
with every OME kit I have ever fitted (quite a few) the front shock length matches spring open length pretty closely.
You will not be able to realistically fit a longer shock than the OME fitment without bumpstop spacers or moving the mounts.
PS you are quoting about 8" of shaft travel on your preffered shock. this is far more than is in the stock front springs (about 6", tops.) Also, OME pretty carefully match their shock rates to the spring rate they build. Knowing that the OME027 shock is not for a sierra, I would say it will be not good in your application.
Steve.
with every OME kit I have ever fitted (quite a few) the front shock length matches spring open length pretty closely.
You will not be able to realistically fit a longer shock than the OME fitment without bumpstop spacers or moving the mounts.
PS you are quoting about 8" of shaft travel on your preffered shock. this is far more than is in the stock front springs (about 6", tops.) Also, OME pretty carefully match their shock rates to the spring rate they build. Knowing that the OME027 shock is not for a sierra, I would say it will be not good in your application.
Steve.
[quote="greg"] some say he is a man without happy dreams, or that he sees silver linings on clouds and wonders why they are not platinum... all we know, is he's called the stevie.[/quote]
well with the wheels off the ground i measured from the inside top of shock mount to the middle of the bottom shock pin. i get a measurement of 470mm
ARB recommended OME015 which only open to 415mm.
so theres no point in putting the 15's on when it will bottom out on the shock.
i think ill prob have to modify the bump stop. to reduce the travel. do u know where i can get some bump stop spacers or do i just make them up from a bit of steel.
the other strange thing is the sway bar wont fit when the wheels are off the ground. its too short. i have to lower the car to get the sway bar on. i dont even have extended shackles, just stock.
ARB recommended OME015 which only open to 415mm.
so theres no point in putting the 15's on when it will bottom out on the shock.
i think ill prob have to modify the bump stop. to reduce the travel. do u know where i can get some bump stop spacers or do i just make them up from a bit of steel.
the other strange thing is the sway bar wont fit when the wheels are off the ground. its too short. i have to lower the car to get the sway bar on. i dont even have extended shackles, just stock.
As part of the complete suspension kit, OME supply plates that lower the top mounting point of the sway bar.
I am a bit confused by this situation. Obviously you are fitting this gear yourself. Normally, ARB supply a complete kit, based on your needs. For the springs to be 65mm over length, something wierd is going on. As I said, with every OME kit I fitted, the shocks are really close to the right length.
that figure on 64mm over will almost be what you will have if you try and put rears on the front- it quite a lot too long.
In any case, regardless of where the spring sits "free" its really more important where the car sits when the load is back on it. Sure, you can look into lowering the bumpstops, but as I said, if you choose another OME shock from another application, you are on you own when it comes to ride and handling.
The extended length of the shock is pretty much irrelevant. The important measurement is the collapsed length. As a rule of thumb, you need to leave 1" for bumpstop compression, so you will tend to find that the recommendation from OME is based on this collapsed length.
I have just done some quick measurements. A OME rear shock is 470 fully open. The front shock (I don't have one lying around) will need to be around 250mm collapsed to fit.
Working with your 290mm figure, you are going to need a 40mm bumpstop spacer. Based on 2" of lift, you will only have 10mm more compression travel than a stock sierra, so most of the ride advantage of the OME kit will be gone.
Put the car together, cross it up, get it to settle down and then check the heights. My guess is that you have the wrong springs. The car should sit tail high (just) I think, with what you are describing, the nose will sit high.
Steve
I am a bit confused by this situation. Obviously you are fitting this gear yourself. Normally, ARB supply a complete kit, based on your needs. For the springs to be 65mm over length, something wierd is going on. As I said, with every OME kit I fitted, the shocks are really close to the right length.
that figure on 64mm over will almost be what you will have if you try and put rears on the front- it quite a lot too long.
In any case, regardless of where the spring sits "free" its really more important where the car sits when the load is back on it. Sure, you can look into lowering the bumpstops, but as I said, if you choose another OME shock from another application, you are on you own when it comes to ride and handling.
The extended length of the shock is pretty much irrelevant. The important measurement is the collapsed length. As a rule of thumb, you need to leave 1" for bumpstop compression, so you will tend to find that the recommendation from OME is based on this collapsed length.
I have just done some quick measurements. A OME rear shock is 470 fully open. The front shock (I don't have one lying around) will need to be around 250mm collapsed to fit.
Working with your 290mm figure, you are going to need a 40mm bumpstop spacer. Based on 2" of lift, you will only have 10mm more compression travel than a stock sierra, so most of the ride advantage of the OME kit will be gone.
Put the car together, cross it up, get it to settle down and then check the heights. My guess is that you have the wrong springs. The car should sit tail high (just) I think, with what you are describing, the nose will sit high.
Steve
[quote="greg"] some say he is a man without happy dreams, or that he sees silver linings on clouds and wonders why they are not platinum... all we know, is he's called the stevie.[/quote]
That looks fine to me. Yes, it is sitting high ATM. It will settle a little, but OME are designed for some load and your car looks pretty light.
I would not install any other shock than the recommended OME fitment for you application. the 60mm you are referring to that is in the springs is not "lost" travel- the travel your car has us set by the chassis design (i.e bumpstop and shock mounts) and you will open a whole can of worms up if you try and "recover" it. Bascially, you are goig to have to do a fair bit of fabrication work. Leave well enough alone for now.
Ps are they "Dakar" springs or genuine OME? I have heard that Dakar springs have a little more initial arch.
PPS - no, you won't have much droop in the front end with the car at that height. It's pretty much the nature of the beast.
Steve.
I would not install any other shock than the recommended OME fitment for you application. the 60mm you are referring to that is in the springs is not "lost" travel- the travel your car has us set by the chassis design (i.e bumpstop and shock mounts) and you will open a whole can of worms up if you try and "recover" it. Bascially, you are goig to have to do a fair bit of fabrication work. Leave well enough alone for now.
Ps are they "Dakar" springs or genuine OME? I have heard that Dakar springs have a little more initial arch.
PPS - no, you won't have much droop in the front end with the car at that height. It's pretty much the nature of the beast.
Steve.
[quote="greg"] some say he is a man without happy dreams, or that he sees silver linings on clouds and wonders why they are not platinum... all we know, is he's called the stevie.[/quote]
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