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Post by schercheeroo on Jun 3, 2018 14:08:06 GMT
Fitted an NB ARB to my NA over the week end. The ARB I removed was 20mm in diameter, the new NB ARB was 22mm in diameter. That's a 10% increase in diameter so I guess its at least 10% stiffer. I'm sure some suspension guru will tell us how much stiffer it actually is. The ARB does fit, but the geometry at the end of the bars is different, as shown below (NA lower bar, NB upper bar): Because of this difference the standard NA drop links wont fit. Also my car is lowered so the drop links are too long. My solution was to make the standard drop links adjustable (i'm too cheap to buy adjustable drop links) First, chop about an inch out from the middle of the drop link and thread the ends M10x1.5 Second fit the hardware. A long connecting nut (got them from screw fix) and some nylocs. I have two nylocs shown here, but found I only needed one to make it fit on the car. Third, fit it to the car. NB drop links are different to the NA items I modified here. The NB drop links have ball joints rather than bolt through bushes. In the future I may buy one, cut it in half and install a ball joint to the upper half of each of the drop links.
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Post by Rickster on Jun 3, 2018 17:25:54 GMT
I like maths so your 2mm extra adds up to a lot more than 10% in terms of cross sectional area (assuming they are solid) More than 20% stiffer I say
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Post by rhyswh on Jun 5, 2018 19:44:20 GMT
What effect would a stiffer ARB have on the roads? Would it improve body roll without effecting ride quality or would it stiffen the suspension in every aspect?
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Post by schercheeroo on Jul 11, 2018 11:50:52 GMT
What effect would a stiffer ARB have on the roads? Would it improve body roll without effecting ride quality or would it stiffen the suspension in every aspect? I got to test out the new ARB in anger at the Mighty5's track day the other weekend. I think if it did make a difference, it wasn't a big difference. Or at least not a big enough difference for me to see any benefit on track. I was hoping to improve the grip on the rear end with the stiffer front ARB so I could stiffen up the suspension and reduce body roll. There were a lot of cars running coil overs that weekend, and seeing how they were performing in relation to my vehicle I think I need to go coil overs and aftermarket ARBs to get the car to handle how I want it to.
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Post by wannabe on Jul 11, 2018 13:06:24 GMT
Suspension is a dark art lol
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Post by dadbif on Jul 11, 2018 13:08:42 GMT
I don’t intend fitting an NB roll bar, but I may pinch your idea and make my drop links adjustable, will help Get rid of some minor ride height variations.
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Post by MX5spares on Jul 12, 2018 6:07:38 GMT
Interesting.Are the mk1 droplinks not hollow in the centre?? therefore very little "meat" left after rethreading them to take nuts etc. Its not life or death as I have seen several cars with broken droplinks and drivers did not even notice. I am currently driving Corolla G6 1.6 with no droplinks on rear and yes I can notice that. (Incorrect ones supplied to me)so good luck, happy motoring.Nice idea.
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Post by dadbif on Jul 12, 2018 6:21:48 GMT
A good point. I measured an old pair last night to make sure there was enough “meat” to accept a dienut, there is, however I was assuming they were solid, if not I wouldn’t dream of threading a tube and then putting all the forces involved through such a thin walled section, weakened by the removal of metal when threading.
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Post by schercheeroo on Jul 12, 2018 7:24:50 GMT
Are the mk1 droplinks hollow in the centre?? No
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Post by MX5spares on Jul 13, 2018 16:52:07 GMT
Ah , good news then, solid.
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