Suspension question 100 TD

Submitted: Sunday, Nov 07, 2010 at 16:43
ThreadID: 82351 Views:3199 Replies:4 FollowUps:4
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I have a cruiser 100TD.

it's currently running Bilsteins shocks and from the part numbers on the Tbars, looks like I have Iron Man springs.

I find the set-up Ok for on road and slow off road stuff but corregations and rocky stuff it terrible....always feels like I've got 60psi in the tyres no matter what pressure you run.

It's too stiff and I'm wondering if it is the shocks or the spring causing the issue. Bilstein are suppose to be pretty good stuff and I can't imagine the iron Man gear being so rigid, so I suspect the shocks are the issue.

Anyone know the answer? I don't really want to go to the expence of changing the shocks but maybe I have to???

Cheers
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Reply By: Patrol22 - Sunday, Nov 07, 2010 at 16:47

Sunday, Nov 07, 2010 at 16:47
There are probably a number of setups you can get Andrew the prince among which are the Rancho shocks with the in cabin adjustment. But before you go to the expense of changing out your suspension - have you tried varying your tyre pressures on gravel roads. I tend to run 40-45 psi in BFG AT on the bitumen but drop this to 25-28 when on corrugated gravel and find it works for me. Used to work on my Patrol with and OME setup and also works on the D40 Navara with a Ridepro setup.
AnswerID: 435273

Follow Up By: Member - Andrew (WA) - Sunday, Nov 07, 2010 at 18:07

Sunday, Nov 07, 2010 at 18:07
Yep tried all that...like I said...it feels like 60psi no matter pressure I run.
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FollowupID: 706447

Reply By: Ruffy-Dan - Sunday, Nov 07, 2010 at 22:23

Sunday, Nov 07, 2010 at 22:23
It could be either. How does the vehicle behave wih some load in it?
Bilstien are not known for there supple ride. They are an excellent shock but not valved as soft as some, how ever if the are rebuildable versions you could have this rectified.
Any good suspension shop or 4wd shop "should" be able to roadtest it with youj and tell you if it's shocks or springs.
AnswerID: 435301

Reply By: Member - Alastair D (NSW) - Monday, Nov 08, 2010 at 08:35

Monday, Nov 08, 2010 at 08:35
Andrew,
Since you mention Tbars I assume you have an IFS cruiser like mine.

I have Bilstein shocks on my 100 and HD TJM bars and coils. When unladen my ride is firm and would probably be harsh on corrugations but I have always been loaded so don't know. I played with my setup for a while changing a few things but decided that my current setup works well at my touring weight so am sticking to it.

Do you still have the original shocks? If so then I would make the effort of putting them back in for a trial. It should tell you if the shocks are the primary cause.

Frankly I think that it is near impossible to get a suspension that rides well under all loads. Perhaps a cab adjustable shock system may be the answer but have never tried it as I prefer to not have one more thing to go wrong in the bush.

cheers
AnswerID: 435314

Reply By: Crackles - Monday, Nov 08, 2010 at 20:52

Monday, Nov 08, 2010 at 20:52
In your rigpic your car seems to be sitting quite high in the front for a IFS 100 series that is empty. A possibility is your Tbars are too heavy for the weight or are wound too far up. Either way Iron Man & Bilsteins seem an unusual pairing & unlikely the spring rate was ever matched to the shocks. Billy's are a naturally firm shock giving a somewhat stiff ride but find mine to excell on high speed corrugated roads.
"...it feels like 60psi no matter pressure I run." Out of intrest what pressure do you run & speed you normally travel at on corrugated roads?
Cheers Craig....................
AnswerID: 435387

Follow Up By: Member - Andrew (WA) - Monday, Nov 08, 2010 at 21:07

Monday, Nov 08, 2010 at 21:07
Craig

it doesn't actually sit that high any more......sits nicely now with the nose slightly down.

I run 34 - 40 psi depending on road conditions and what I'm doing, much less sand driving of course. I've had plenty of off road driving experience, I live in the country, and used many different cars, towed stuff etc.

It's just a weird combo, and on the corrugations....Exmouth to Coral bay down the beach side track....I tried tyre pressures from @36psi down to 20psi. Running BFG's

There was little difference in the ride...felt like I had steel rims and no rubber.

Very disappointing, I'd like a little more 'glide' out of it.

Maybe I expect too much but maybe the Iron man stuff is crap.
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FollowupID: 706555

Follow Up By: Ruffy-Dan - Tuesday, Nov 09, 2010 at 21:52

Tuesday, Nov 09, 2010 at 21:52
Rather than the product being crap, i would suggest it's either not right for the application or mismatched.
Shocks and spring rates don't need to be matched so much as the weight the springs are carrying and the weight the shocks are trying to control.
Does it handle considerably better with a 100kg's or so in the back?
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FollowupID: 706678

Follow Up By: Member - Andrew (WA) - Thursday, Nov 11, 2010 at 01:08

Thursday, Nov 11, 2010 at 01:08
I've got draws in the back + about 20 - 30kgs of gear in them all the time. It handles ok in most conditions...it's just the extreme harshness of corregations that's got me stuffed...
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FollowupID: 706803

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