Bp51 settings

Bp51 settings

Postby sonof8pies on Mon, 31 Aug 2020 5:28 +0000

Gday all just wondering what settings people are running their compression and rebound at? Just had this suspension fitted to my 2017 sr5 dual cab. The reason was to try to eliminate the shuddery feeling front end on crappy bitumen roads or those small sharp potholes. Have tried a bunch of different setting combinations but so far have been disappointed with the results. Performance on bush tracks is awesome but i do a lot of hwy km's and the shaky front end does my head in.
Im running 265/65/18 tyres at 32psi all round and have the arb summit bar, no winch. Just have the standard tub with no weight in the back most of the time.
Any help or ideas would be much appreciated.
Cheers

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Re: Bp51 settings

Postby TOYZX on Tue, 01 Sep 2020 8:52 +0000

When I set one up on the hoist I usually start at around 3/4compression and 5/6 rebound then test drive. It's hard to know what you are feeling and even harder to fix it on here lol. What did they set them to when you picked it up? and what preload have they set the front springs to?

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Re: Bp51 settings

Postby sonof8pies on Wed, 02 Sep 2020 3:23 +0000

Gday Toyzx it came set at c3 r6 all around and current have it set at c2 r7 which is about as good as i can get it so far. The feeling is hard to describe bit it feels like the front is sort of jittery. The sort of bumps that give you bullbar wobble. I dont know how the preload in the front is set, how do i tell?
After the 500k check the height has settled to 55mm lift in the front and 65mm in the rear. I assume it will settle a bit more yet?
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Re: Bp51 settings

Postby Myralga on Wed, 02 Sep 2020 7:08 +0000

Interesting [emoji848]
Toyzx I always set the opposite way around to what you have stated. I’m interested to hear why you set like that as it doesn’t make sense to me but happy to hear your thoughts?

For me though compression is high on mine and rebound is low. (Can’t remember the exact specs but I’m a lot heavier then you as I’m near GVM).

Compression is how much it doesn’t want to collapse.
Rebound is how quickly it returns to open position.

I always found if rebound is set too high and compression too low. the tire doesn’t float as nice. IE in bad conditions like heavy corrugations etc you can have a collapsing effect on the shock.

You want your tire to remain in contact with the ground ideally 100% of the time. By keeping rebound low it will help this happen and possibly resolve your issues.

Try something like 4-5C 2R front 3-4C 1-2R rear see what it feels like. I’m usually a lot higher then this I think I run at the moment 7-8C 2-3R Front and similar rear spec but I drop the rears right back to counteract my constant 300kg springs when it’s unloaded then boost it right up what loaded camping/touring.


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Re: Bp51 settings

Postby NZMarkb on Wed, 02 Sep 2020 7:48 +0000

Interesting read guys
Funny thing a mate of mine brought a Hilux with BP51's already fitted
When we checked they were all still set at 0/0

My 10c's worth
Every shock will be slightly different as will be the load of your ute
Start in the middle and make bold adjustments to start with (rebound or compression not both) that way you will feel the change, remembering they affect each other
If you find yourself chasing your tail then look at spring rates
Then make your fine adjustments
Just what I've learnt with dirt bikes and race cars over the years
They are a very nice shock
Good Luck
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Then try standing in front of them
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Re: Bp51 settings

Postby TOYZX on Wed, 02 Sep 2020 4:12 +0000

The way we were told and from we have found is like what I mentioned. Turning the rebound up to the higher end slows the rebound down otherwise in corrugated roads they get a slap up because the wheel is returning too fast. I like to get them set so when you hit a bump or causeway the car settles quickly. I've found with less rebound they tend to continue bouncing a few times after a bump. We've had 200series getting around with 1comp and 10reb. Weird I know but they say the customer is always right lol. As mentioned if ya can't get it rite then maybe look at springs. Another thing to add is that you'd be surprised how much the back can affect the front if not srung rite. Front spring preload is measured from the top of the spring adjustment collar to the top of the threads. Essentially measuring how much thread is exposed above the collar.

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Re: Bp51 settings

Postby sonof8pies on Wed, 02 Sep 2020 4:17 +0000

Thanks a lot for the replies I will measure the preload. What should it be roughly? Heaps of good info there, much appreciated. I will continue to make some adjustments and see how it goes.
One thing I did wonder was how to tell if it's the front or back thats upsetting the ride.
I'm a bit out of my depth when it comes the this stuff.
Cheers

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Re: Bp51 settings

Postby TOYZX on Wed, 02 Sep 2020 7:35 +0000

I think the lux, bar only setting is 15mm from memory.

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Re: Bp51 settings

Postby sonof8pies on Thu, 03 Sep 2020 1:00 +0000

So have measured preload, a touch over 20mm can anyone tell me if this is correct for bullbar only??.
Just have the arb summit bar, no side rails or anything.
CheersImage

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Re: Bp51 settings

Postby TOYZX on Thu, 03 Sep 2020 8:24 +0000

Will check the manual tomorrow unless someone beats me to it.


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Re: Bp51 settings

Postby Myralga on Thu, 03 Sep 2020 8:50 +0000

Interesting Toyzx I might play a little next time I’m on the tracks.
From memory 20mm is bar and winch. (This is how they come from factory) 15 is bar only and 5 is nothing. But that’s memory.

Then you get a rig like mine where I have max load. And I have a heavy LH Side. So I have LH preload maxed out. RH has 10mm less then that measurement plus in the rear I have a 10mm packer in the LH spring set. It’s a mess but it’s as good as we can get it.


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Re: Bp51 settings

Postby TOYZX on Fri, 04 Sep 2020 8:13 +0000

15mm is bar only preload. For future reference, keep an eye on them lower bushes lads!Image

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Re: Bp51 settings

Postby sonof8pies on Fri, 04 Sep 2020 5:55 +0000

Cheers Toyzx. Is that a failure from a seized bush or one thats flogged out?

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Re: Bp51 settings

Postby sonof8pies on Fri, 04 Sep 2020 5:57 +0000

Never mind just saw your other post

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Re: Bp51 settings

Postby Autorres on Thu, 08 Oct 2020 11:02 +0000

I'm on 25mm preload front C2 R6, rear c4 r6.
With an arb bar and no winch until last week
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Re: Bp51 settings

Postby sonof8pies on Fri, 09 Oct 2020 3:59 +0000

Cheers autores did you find adding the winch made much of a difference to the ride quality?

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Re: Bp51 settings

Postby Autorres on Wed, 14 Oct 2020 11:46 +0000

sonof8pies wrote:Cheers autores did you find adding the winch made much of a difference to the ride quality?

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Hi, I actually did the ride is somewhat softer up front but not much, also there is barely no drop in the suspension after fitting the winch. I fitted a smittybuilt x20 12000lbs winch.
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