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Lowering Suspension

This is a discussion on Lowering Suspension within the Suspension forums, part of the Technical category; Here's one from left field: I am trying to work out how to drop down the suspension on my RZR LE. WHY? I hear you ...


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  #1  
Old March 27th, 2011, 09:53 PM
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Lowering Suspension

Here's one from left field:
I am trying to work out how to drop down the suspension on my RZR LE. WHY? I hear you say.Well , basically I will be racing on hard pack flat track,no bumps , no woops,just fast well packed sandy gravel type stuff akin to a really well groomed road base.The lower I can get the centre of gravity, the more stable it will be at a decent speed on tight windey circuits,where I can hopefully get the rear end swing'n with little fear of a roll-over. So, I figure if I can move the shock mounts so as to drop the chassis down,which will widen the track a little as well,this could be the answer. One issue I can see is drive shaft lengths,although there is a fair bit of forgivness in these I think. Bump stops will probably be in order too I would say. Basically I need to get it as low as possible,with still relatively stiff hard suspension.
Any thoughts or ideas would be greatly appreciated. I know it's a total reverse of what we generally try to achieve,but hopefully I can set this up as a relatively quick and easy change out for trail work.

Good on ya!
Mick
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  #2  
Old March 28th, 2011, 05:12 AM
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Re: Lowering Suspension

Well.... at least you have a good reason.

I personally would look for shorter shocks, with a very stiff spring. That way, you could just swap the shocks, and be back at regular ride hight in an hour or so.

Even though, you want to be low... I probably wouldn't go past the A-arms being level. If you need to be lower than that... get a smaller tire, with a stiffer sidewall.
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  #3  
Old March 28th, 2011, 03:31 PM
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Re: Lowering Suspension

Thanks DR, finding shocks and springs out here is like trying to find hens teeth, hence the idea of lowering the mounts.Can't see it should be a problem really,after all some of the lift kits do the same thing,but in reverse.Rally tyres are an option too,and maybe some thing to play with down the track,as you suggest,smaller dia and lower to the ground.iIm not sure what it's called in the US, but the events I am looking at are called,Motorkhana and Khanacross here......on dirt,not bitumen at this stage.
Thanks for your input....I have some experimenting to do!!
Cheers
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  #4  
Old March 28th, 2011, 05:05 PM
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Re: Lowering Suspension

quick thought would be to get 2" wheel spacers...bring your tires out more for more stability...stiffer shorter springs would be ideal ...maybe you can get a set of cheap springs and cut them down a little??? that type of racing sounds like a blast!
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  #5  
Old March 28th, 2011, 06:12 PM
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Re: Lowering Suspension

try making brackets that move the shock mounts further out on the a arm. other than that you could try searching ebay for snowmobile shocks or racing atv shocks, the rears are short and stiff but you will need to change out the bottom eye.... good luck to ya, we lowered a pair of Blasters ages ago and used slicks on the rear....man they were fun to ride!
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  #6  
Old March 28th, 2011, 07:48 PM
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Re: Lowering Suspension

I have been flat track racing my LE for a season now. Here is my setup.

2 inch spacers- all 4 corners.
4 steel stock rear razor rims turned around backwards ( you will need to put a washer on each wheel stud to take up for the dimple in the rim)
Turn all shocks down to the lowest setting except the front right. Turn it down to the third to last setting.
Strip off everything you don't need, pass seat, tool tray in front, pass grab bar, everything you don't need.
I went down to the tractor supply store and bought 4 23x12 Carlilse turf tires not the plain flat ones these had a little tread. Sipe them if you have access to a tire sipe.
12 lbs in front right, 10 lbs in right rear, 9 in left rear, and 10 in left front.
I ran VP 113 oxygenated fuel.

If its a standing start start in AWD then click into 2wd after you are up to speed. it should slide around some which will help corner entry.

Never lost a race hope some of it works for you.
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Old March 28th, 2011, 08:27 PM
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Re: Lowering Suspension

Thanks Guys for the posts so far,all good stuff. The ideas just keep coming.
I have on order some 14" 5" outward offset wheels for the rear and spacers on 3" outward fronts. this will widen me up a bit further,although not as much as the "S" with whome I will be competing also. The shorter harder spring idea will not work I think on std shocks as it will run out of travel on the shock compressed.I don't like the chances of finding a shorter shockie here,but I will keep an eye out.Harder springs I can have made here no problem,so I think I am down to shifting mounts as suggested. I have a spare set of steelies too,I will give the reverse wheel thing a go as well.They are 12" and they guys at the track said rally tyres are easy to find in size second hand to give things a go.If not I will give the turfies a go.I gather a sipe is what we call a tyre iron.A hot iron for tyre tread cutting? I have one here.
Sounds like you have sorted your lot out Dirtmod, would be good to get a little video of what your up to over there. I am pushing poo up hill with the way mine is set up,mudlite xl's are not the tyre to be using for this stuff, but it's early days,and I will get it together eventually.
Thanks again guys,It is a lot of fun to race this stuff,just opens another form of racing for these beaut machines. Cheers,Mick
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  #8  
Old March 29th, 2011, 06:33 AM
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Re: Lowering Suspension

Quote: Originally Posted by smitty View Post
Thanks Guys for the posts so far,all good stuff. The ideas just keep coming.
I have on order some 14" 5" outward offset wheels for the rear and spacers on 3" outward fronts. this will widen me up a bit further,although not as much as the "S" with whome I will be competing also. The shorter harder spring idea will not work I think on std shocks as it will run out of travel on the shock compressed.I don't like the chances of finding a shorter shockie here,but I will keep an eye out.Harder springs I can have made here no problem,so I think I am down to shifting mounts as suggested. I have a spare set of steelies too,I will give the reverse wheel thing a go as well.They are 12" and they guys at the track said rally tyres are easy to find in size second hand to give things a go.If not I will give the turfies a go.I gather a sipe is what we call a tyre iron.A hot iron for tyre tread cutting? I have one here.
Sounds like you have sorted your lot out Dirtmod, would be good to get a little video of what your up to over there. I am pushing poo up hill with the way mine is set up,mudlite xl's are not the tyre to be using for this stuff, but it's early days,and I will get it together eventually.
Thanks again guys,It is a lot of fun to race this stuff,just opens another form of racing for these beaut machines. Cheers,Mick
Its all good man. I come from dirt racing I currently race dirt latemodels. So I had some things that transfered. The tire sipe is different from the tire iron. The sipe cuts slits in the tire to let heat out and keep the tire from glazing or sealing over in extreme heat. I am not sure this is a problem with RZR racing but it seemed to allow grip even when the track got the blue groove. I think my buddy has some video he is a member on here too. I will see if he will load it up. Yeah mudlite's are going to roll the sidewalls too much you need something wider with less agressive tread.
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Old March 29th, 2011, 06:37 AM
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Re: Lowering Suspension

Quote: Originally Posted by smitty View Post
Thanks Guys for the posts so far,all good stuff. The ideas just keep coming.
I have on order some 14" 5" outward offset wheels for the rear and spacers on 3" outward fronts. this will widen me up a bit further,although not as much as the "S" with whome I will be competing also. The shorter harder spring idea will not work I think on std shocks as it will run out of travel on the shock compressed.I don't like the chances of finding a shorter shockie here,but I will keep an eye out.Harder springs I can have made here no problem,so I think I am down to shifting mounts as suggested. I have a spare set of steelies too,I will give the reverse wheel thing a go as well.They are 12" and they guys at the track said rally tyres are easy to find in size second hand to give things a go.If not I will give the turfies a go.I gather a sipe is what we call a tyre iron.A hot iron for tyre tread cutting? I have one here.
Sounds like you have sorted your lot out Dirtmod, would be good to get a little video of what your up to over there. I am pushing poo up hill with the way mine is set up,mudlite xl's are not the tyre to be using for this stuff, but it's early days,and I will get it together eventually.
Thanks again guys,It is a lot of fun to race this stuff,just opens another form of racing for these beaut machines. Cheers,Mick
Sorry I didn't notice the first time you are from Australia. In that case let me get the tire model I am using so you have a better idea what we are running. About how long is the longest straight you run down. I dropped tire sizes by two sizes. It jumps out of the hole on the start but you may be concerned with running out of steam by the time you hit the first corner.
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Old March 29th, 2011, 01:23 PM
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Re: Lowering Suspension

Hey Brian,Thanks man . The two different events.Khanacross is like a small rally course with the longest straight stretch being 120yds.There are plenty of twists and turn though through about a 2-3mile track.Motorkhana is really short and tight, around a series of flags,different layouts and different routes through at each stage.You would fit a course inside two basketball courts.It's a blast to watch folks driving their daily drives through this stuff.Great training for teenagers.It is a good idea for them I recon.Of course we go a whole heap faster,but it sharpens you up for sure! The tyre size I think will not be an issue. There is a rally sprint series as well, but I think it will be too long for us.It is generally run in the forrest,and guys are running at 100mph plus as they have the room on a full size course. Thanks again for the info.
Cheers, Mick
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Old March 29th, 2011, 07:10 PM
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Re: Lowering Suspension

Quote: Originally Posted by smitty View Post
Hey Brian,Thanks man . The two different events.Khanacross is like a small rally course with the longest straight stretch being 120yds.There are plenty of twists and turn though through about a 2-3mile track.Motorkhana is really short and tight, around a series of flags,different layouts and different routes through at each stage.You would fit a course inside two basketball courts.It's a blast to watch folks driving their daily drives through this stuff.Great training for teenagers.It is a good idea for them I recon.Of course we go a whole heap faster,but it sharpens you up for sure! The tyre size I think will not be an issue. There is a rally sprint series as well, but I think it will be too long for us.It is generally run in the forrest,and guys are running at 100mph plus as they have the room on a full size course. Thanks again for the info.
Cheers, Mick
With the 120 yrd straight you may be in trouble on the top end with the 23 inch tires. Might want to go with something with more roll out. With the little course I def suggest the smaller tires. You will jump off the tight turns. If you run into questions give me a shout I would be glad to give any info I can. We have a couple of Ideas we are going to try this year I will pass on what I find out. Best of luck to you bro! I hope you win it all.
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Old March 29th, 2011, 09:16 PM
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Re: Lowering Suspension

Thanks Brian, I will play with it.I have found some tyres off of a Mini.12".They were a very popular rally vehicle in their day,and they still run in the classic series.I did the shock lowering deal today ,on the rear so far(A big storm shut me down)I will throw some pics your way when I can.It might help.I managed to drop 4" with the suspension still above horizontal,Just.It will be an easy change out back to the original mounts,ten minutes with a floor jack and battery driver.I will try the smaller tyres in the Motorkhana, and run the Bajas(when they show up) on for the Khanacross as you suggested. Trial and error no doubt.Thanks man, will be great to see how things pan out with your ideas.Hopefully I can dish you something worthwhile too.
Cheers,Mick
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Old March 29th, 2011, 09:24 PM
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Re: Lowering Suspension

Quote: Originally Posted by smitty View Post
Thanks Brian, I will play with it.I have found some tyres off of a Mini.12".They were a very popular rally vehicle in their day,and they still run in the classic series.I did the shock lowering deal today ,on the rear so far(A big storm shut me down)I will throw some pics your way when I can.It might help.I managed to drop 4" with the suspension still above horizontal,Just.It will be an easy change out back to the original mounts,ten minutes with a floor jack and battery driver.I will try the smaller tyres in the Motorkhana, and run the Bajas(when they show up) on for the Khanacross as you suggested. Trial and error no doubt.Thanks man, will be great to see how things pan out with your ideas.Hopefully I can dish you something worthwhile too.
Cheers,Mick
Here is a pic of mine with the smaller tires.

Last edited by Dirtmod15jr; May 22nd, 2012 at 07:06 AM.
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  #14  
Old March 29th, 2011, 09:47 PM
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Re: Lowering Suspension

you may want to pm 4Nines here on the forum. his was set up stiff and low for his pikes peak run

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Old March 29th, 2011, 09:53 PM
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Re: Lowering Suspension

Man that looks sharp!! I can see why you get a bit of slip with those tyres.Very Nice!
Here's a couple of pics from todays project.will work on the front tomorrow.
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Last edited by smitty; March 29th, 2011 at 10:20 PM. Reason: add photo
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