Cheap L300 torsion bar upgrade

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Growlerbearnz
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Cheap L300 torsion bar upgrade

Postby Growlerbearnz » Thu May 03, 2018 2:41 am

After fitting air shocks to the rear of my van, which slightly stiffen the rear suspension, I've been thinking that the front suspension is way too soft.

The Japanese market L300 4WD wagon (P25/35W) has 20mm diameter torsion bars on the front suspension. Light springs like these make for a comfortable ride and good suspension flex offroad, but on the road they're a bit weak. Add some extra weight, and 20 years of sag, and you end up with a van that corners with the stability of a newborn giraffe, and cataclysmic nosedive under braking.

2WD L300s have 22mm torsion bars, which might be a decent upgrade. Dobinsons.com.au make 24mm bars, which are about perfect, but the AU$500 price is a little painful.

You know what else has 24mm torsion bars? A Hyundai H100 van. Like this 1998 one at the wreckers:
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The H100 is basically an L300 underneath, and the torsion bars are a perfect match... and they only cost $40 from the local wreckers.

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IMG_20180503_151859 copy.JPG (113.89 KiB) Viewed 903 times
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IMG_20180503_151909 copy.JPG (274.53 KiB) Viewed 903 times


Hyundai part numbers were written on the bars. LH side = 5415043160, RH side = 5416043160.

Hyundai don't fit rubber boots to protect the splines, but it's easy to swap your boots from your old torsion bars to the Hyundai ones. It's about a 45 minute job to swap both bars, and another 15 minutes to set the suspension height.

Results: I think it's just about perfect. It's still a big, floppy 4WD, but it feels a bit more modern to drive. Turn-in is sharper, and the nosedive under braking is less comical. Motorway driving has lost the slight floaty feel and wobble when changing lanes at speed.
Nothing says "poor workmanship" more than wrinkles in the duct tape.

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Sylquebec
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L300 torsion bar upgrade

Postby Sylquebec » Fri May 04, 2018 3:26 pm

thanks for the info

Envoyé de mon SM-G950W en utilisant Tapatalk

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Lapprentis
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Cheap L300 torsion bar upgrade

Postby Lapprentis » Sat May 05, 2018 5:55 am

GOOD FIND ! Any idea of the part number, from which model/year ? There seems to be a few options available: 5416043150, 5415043420, 5415043160. Partsouq seems to have some at less than 100CAN each but none in stock... Also on Alibaba, Chinese made, could it be the same ? Minimum 10 sets order, at less than 15USD a set ???????? (https://www.alibaba.com/product-detail/ ... 25390.html) ! Thanks again.

Lapprentis :M

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Growlerbearnz
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Cheap L300 torsion bar upgrade

Postby Growlerbearnz » Sat May 05, 2018 2:56 pm

I wouldn't trust a torsion bar from anyone but a reputable manufacturer- they're the sort of highly stressed component that can fail from one tiny flaw.

Hyundai part numbers were actually written on the bars, which was nice:
LH side = 5415043160
RH side = 5416043160

The H100 I got the bars out of was a 1998.
Nothing says "poor workmanship" more than wrinkles in the duct tape.

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Lapprentis
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Cheap L300 torsion bar upgrade

Postby Lapprentis » Sun May 06, 2018 9:11 am

Thanks Growler ! autopartmaster.com seem to be the best option for North American L300 Owners ! Will cost about 1/3 of Dobinson.

Lapprentis :M

Killbert
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Cheap L300 torsion bar upgrade

Postby Killbert » Mon Jun 11, 2018 6:55 pm

Genius. Thanks Growler.

K

sk66
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Cheap L300 torsion bar upgrade

Postby sk66 » Thu Jun 14, 2018 11:10 am

Be aware that the H-100/Grace is also equipped with 20mm torsion bars (i.e. 5415043151)... so make sure you get the right part numbers!




don't ask how I know this.... :?
Steven
1991 L300
Harrisburg, PA

sealica
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Cheap L300 torsion bar upgrade

Postby sealica » Wed Jun 20, 2018 3:37 pm

When looking to purchase used torsion bars are there any tests one can conduct to check that they're not worn out already?

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Growlerbearnz
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Cheap L300 torsion bar upgrade

Postby Growlerbearnz » Sat Jun 23, 2018 7:44 pm

When I pulled them out of the Hyundai I checked the mileage- 120,000km so probably fine. But I also figured they're thicker bars holding up a lighter (2WD) vehicle that only drives on the road, so they're probably not going to sag even at much higher mileage.
Nothing says "poor workmanship" more than wrinkles in the duct tape.

sk66
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Cheap L300 torsion bar upgrade

Postby sk66 » Thu Jul 12, 2018 1:22 pm

I did this mod today. But when I set the body height the same as before the bump stop measurement went from the 45mm spec'd to a little over the 51mm spec'd for the 2wd... I can't see why, and I'm not sure which I should use.
Steven
1991 L300
Harrisburg, PA

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Growlerbearnz
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Cheap L300 torsion bar upgrade

Postby Growlerbearnz » Thu Jul 12, 2018 3:38 pm

sk66 wrote:when I set the body height the same as before the bump stop measurement went from the 45mm spec'd to a little over the 51mm spec'd for the 2wd


Set the body height by measuring the bump stops; unwind the adjuster until the bump stop measurement is 45mm. If you set the adjuster to the length they were with the soft springs, the ride height will be higher because the new springs are stronger and won't flex as much as the old springs.
Nothing says "poor workmanship" more than wrinkles in the duct tape.

sk66
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Cheap L300 torsion bar upgrade

Postby sk66 » Thu Jul 12, 2018 6:20 pm

I was measuring the body line off of the axle hub... can't fathom why the same body height has a different bump stop spacing. I must have measured something wrong is all I can figure...
Steven
1991 L300
Harrisburg, PA

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Growlerbearnz
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Cheap L300 torsion bar upgrade

Postby Growlerbearnz » Thu Jul 12, 2018 7:10 pm

Ah, sorry, I totally misunderstood your post. You're right, the relationship between bump stop height and body height can't change unless you change the bump stops or alter the suspension pivot points. Your measuring must be as reliable as my memory ;-)
Nothing says "poor workmanship" more than wrinkles in the duct tape.


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