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diff question full spool ?
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kanks Offline
#1 Posted : Thursday, 27 August 2009 6:05:59 PM(UTC)
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hi could anyone please explain the differance between a lsd/half spool/full spool looking for a vl for my hg 304 is a full spool driveable for a street car thanks in advance
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Utility8 Offline
#2 Posted : Thursday, 27 August 2009 8:03:54 PM(UTC)
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Any spool arrangement turns your 2 axles into one by connecting the ends of each axle together. This removes the differential component of the rear axle, the ability of the wheels to rotate at different rates.
A Limited Slip Differential allows for the two axles to rotate at different rates. When cornering, this is quite necessary for drivability. What a Limited Slip Differential achieves is drivability & the ability of the rear axles to work together. When one wheel looses traction, the power is transferred to the wheel that is not loosing traction. There are a number of different designs, clutches & gears, that achieve this.
I have had a clutched 9" & found that it slowly looses its ability to function as the clutches wear. 10 years ago I fitted a Detroit Locker Truetrac product to a 9" & it is superb. Check out this link. http://www.locked-drive.com.au/tt.php
From what I have seen of any spool fitted to a street car, it is bound to snap axles, of any quality. When cruising, each time you go around a corner, the inner tyre will skip as it keeps the same revolutions as the outer tyre. Each time this happens, the axle is being wound up & released, continuously. I assume big rubber on the rear is a certainty too. No skipping, axle is twisting. After a while, the axle will have had enough & snap due to fatigue. Often it will snap regardless of driving hard at the time or not. The damage is being done every time you turn the steering wheel.
Funnily enough, if you thrash the car on every corner, the inner tyre will slide on the asphalt, and the axle will last longer. The hoon laws then let the copppers take your car though.
In short, full spool for strip work, quality for LSD for street practicality, mini spool for tight arses.


Utility8

Edited by user Thursday, 27 August 2009 8:12:51 PM(UTC)  | Reason: Not specified

utility8
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gts308 Offline
#3 Posted : Friday, 28 August 2009 10:20:56 AM(UTC)
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I agree with Utility8, its pointless having a full spool in a street vehicle.

"We are but a grain of sand on the beach of life"
"We are but a grain of sand on the beach of life"
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Dr Terry Offline
#4 Posted : Friday, 28 August 2009 7:09:25 PM(UTC)
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quote:
Originally posted by gts308
I agree with Utility8, its pointless having a full spool in a street vehicle.
Its not just pointless, its dangerous & probably illegal.

Is there anyone on the forum here who has used a spool in their daily driver? I knew one bloke who did & he found it terrible to drive & nearly impossible to reverse park.

Dr Terry.
If at first you don't succeed, just call it Version 1.0
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Utility8 Offline
#5 Posted : Friday, 28 August 2009 7:27:24 PM(UTC)
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Ive noticed quite a few over the years Dr.T. Generally at weekday cruise nights during the summer months. I always chuckle to myself as the crowd is expected to go OOH & AAH as the inner wheel skips on the road. Its got a spool! My head is saying snap you mother, snap. As I mentioned previously, its all the fatigue from winding-up & releasing that the axle is exposed to that snaps it, not the one burn-out when it lets go. At a couple of hundred bucks for a mini spool, its only the next stage up from an agricultural CIG Locker. As much as I reckon we are all in this sport for the wow factor, I put them in the same category as monster tachos & steel rims on the back of Commodores.
If you gunna have a crack, have a decent one. Go Detroit.

Utility8

Edited by user Friday, 28 August 2009 7:28:40 PM(UTC)  | Reason: Not specified

utility8
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Dr Terry Offline
#6 Posted : Friday, 28 August 2009 10:38:47 PM(UTC)
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quote:
Originally posted by Utility8
As much as I reckon we are all in this sport for the wow factor, I put them in the same category as monster tachos & steel rims on the back of Commodores.
If you gunna have a crack, have a decent one. Go Detroit
Are you saying that steel rims on the back of Commodores is done deliberately?

I always though that they did it because they were so p@#s poor & couldnt afford to replace their 19" or 20" rear tyres after doing burn-outs, so they just fitted their old steel rims & standard tyres, while they were saving up the required cash. It looks crap, I cant believe they are doing it for looks.

I agree with you on the Detroit Locker, they are the only locker for the street if you really need one.

Dr Terry.
If at first you don't succeed, just call it Version 1.0
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Jim5.0 Offline
#7 Posted : Saturday, 29 August 2009 12:35:47 AM(UTC)
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You can also buy ARB electric switchable lockers for most 4WD diffs as well as the Borg warner/BTR diff. Ford Factory fitted a switchable locker to RTV utes.

Best of both worlds. An open diff for the street and a locker when you want it. I would imagine that the electric locker has a small degree of slip otherwise Ford would be forever replacing snapped axles under warranty.

One of my brothers mates had a Mazda RX3 with a CIG locked diff years ago it was a pig of a thing on the street. To get it through each annual rego test he had an axle with the splines machined off that he could slip in to make the car 1 wheel drive. Whoever built that diff deserves the stripy apron award on two counts.

I have done a CIG locker on a mates diff purely so he could enter a burnout comp in a local show (on the Summernats pad). The car held together and he won the 6 cylinder class outright.

If at first you dont succeed then skydiving is not for you.
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bronsonHX Offline
#8 Posted : Saturday, 29 August 2009 8:23:02 PM(UTC)
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terry, i think they do it for when they are doing burnouts so they dont run the risk of blowing a $350 tyre. A VN to VS with cut springs on stockies has got to be one of the uglier sights. especially with an aero kit.
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Utility8 Offline
#9 Posted : Saturday, 29 August 2009 10:13:07 PM(UTC)
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Dont forget the Monster tacho that sits in the cabin next to the factory one.......on a maniac revving V6.
I really think it is the pose factor. Look at me, I have steel rims with burnout tyres on. I can do a burnout whenever I want to. (preferably in the wet)
Looks lazy & cheap.
I reckon a couple of mates pool their money & buy 1 set of tyres & wheels, to share. then fit em to the front of their Commodores. Pretty clever really.

Utility8
utility8
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HQforme Offline
#10 Posted : Sunday, 30 August 2009 12:55:25 AM(UTC)
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As i see it, the steelies are the burnout look. It was said before "look at me, i can spin my tyres with ease" ...well lah-dee-dah, thats not because of the immense grunt your tired old V6 has, but rather due to skinny, cheap rubber and a loose road surface. Its an easy way to spot a hoon.

With the diffs, even a tight LSD will skip around sharp corners, as witnessed in my mates 10bolt equipped HZ and another mates...brace yourself...twin turbo soarer. Both have since reset their to drivable levels.

As for me, i cant even spin my 245s in the dry without thrashing the thing, and im ok with that. Id rather not wreck these expensive tyres!
"Silly modern cars"
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Jvanner Offline
#11 Posted : Sunday, 30 August 2009 9:21:58 AM(UTC)
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and alot of V6 drivers are puttin chev badges on their cars. but leaving the holden and commodore badges on the boot lid.
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bronsonHX Offline
#12 Posted : Tuesday, 1 September 2009 2:06:19 AM(UTC)
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i was getting a ride in a mates mates car, it wasnt such a bad car (at least it was a v8) but on top of his dash he had this 5", 10,000rpm tacho with shift light. the car already had a tacho, and it was an auto that changed at around 2700 revs. waste of $300?
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Utility8 Offline
#13 Posted : Tuesday, 1 September 2009 3:20:21 AM(UTC)
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Yep, it would appear so.

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