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Old 07-17-2005, 07:15 PM   #1
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Default Spool benefits?

Read an article
http://www.off-road.com/toyota/tech/other/4_axles.html

Spools
A spool is carrier setup that turns both wheels on an axle the same speed as the ring gear. Spools are lousy on pavement because there is no differential action, and they eat tires (especially if you ever turn corners . But you can always count on power to both wheels. Spools are common in drag racing. I don't know of any manufacturer that makes spools for Toys - but there's an easy way to fabricate one: Just take your open diff, and weld your spider gears to the carrier. This is often referred to as a "Lincoln Locker" because there is a good chance your welder was built by Lincoln Electric. I can't think of many situations where a spool would be a preferable modification to a Toyota 4x4, except maybe on a trail-only rig. Don't put it on the front anyways; not if you ever want to steer.


What does a spool do in an RC car?
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Old 07-17-2005, 10:11 PM   #2
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Spool is the most consistant and easy to drive of all front diffs. You can race closely, and use breaking efficiently. Works great on asphalt. I've never tried one on carpet.
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Old 07-17-2005, 10:34 PM   #3
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Quote:
Originally Posted by KillWency
What does a spool do in an RC car?
Gives good corner exit power down, and allows you to brake.

Can cause understeer going into a corner also, because the wheels are locked togeather and fight each other.
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Old 07-17-2005, 11:53 PM   #4
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Quote:
Originally Posted by KillWency
Read an article
http://www.off-road.com/toyota/tech/other/4_axles.html

Spools
A spool is carrier setup that turns both wheels on an axle the same speed as the ring gear. Spools are lousy on pavement because there is no differential action, and they eat tires (especially if you ever turn corners . But you can always count on power to both wheels. Spools are common in drag racing. I don't know of any manufacturer that makes spools for Toys - but there's an easy way to fabricate one: Just take your open diff, and weld your spider gears to the carrier. This is often referred to as a "Lincoln Locker" because there is a good chance your welder was built by Lincoln Electric. I can't think of many situations where a spool would be a preferable modification to a Toyota 4x4, except maybe on a trail-only rig. Don't put it on the front anyways; not if you ever want to steer.



What does a spool do in an RC car?

While,I usually use a spool in really tight tracks.With all those slow corners,that you need to break into corners and acclerate hard out of them.This is usually the time to use a spool.
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Old 07-18-2005, 05:59 AM   #5
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SPOOL!!! i just love it... it allows you to late-break on turns which is sort of an advantage especially if you are being tailed by a one-way(er), it distracts his driving coz definitely he has to release throt earlier than you and some tend to forget that they have a different line than yours(one-way-ers). also, it gives you the advantage of being able to accelerate hard upon exiting a turn as Ben.C has mentioned. disadvantages however are minimal like understeer, but by adding anti-dive in the fronts that would sort it out. tire wear suffers more when using spool than using one-way... and belts too with the Mi2 it isn't such a problem coz we use belts made by GATES hope i'm right on this...
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Old 07-18-2005, 06:11 AM   #6
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Spool is very easy to drive, easier than a one way or diff. On small carpet tracks its slower than a one way because the car always is a bit understeerig, especially entering the corner. In modified racing it's also nice to drive because the car accelerates very stable...
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Old 07-18-2005, 06:15 AM   #7
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marcel: nice avatar hehe... you definitely beat mine haha
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Old 07-18-2005, 06:17 AM   #8
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You should see my others.....
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Old 07-18-2005, 06:31 AM   #9
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one big advantage is you dun have take care about it...like ceramic diff balls....tighteness....new diff plates.......diff lube....etc, etc, etc

install a spool, and end of story
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Old 07-18-2005, 06:38 AM   #10
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If you use an spool made of aluminum you'll have to take care of it, otherwise you may have problems removing the ball bearings. This depends on the mold of the spool of course, but for example the Pro4 spool has this problem.
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Old 07-18-2005, 06:39 AM   #11
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You may not have to look after a spool as much as a diff or one-way but it greatly increases loads on your drive train. Outdrives, dogbones/universals, axles and more can all suffer from spools, especially on a very high grip surface where the wheels are fighting each other through every corner. I built a spool for my car by locking up an old balldiff but prefered to use a diff in the end as it better suited me. The spool tended to make the car push far too much through the corners for my style of driving.
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Old 07-18-2005, 06:43 AM   #12
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....One Way....
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Old 07-18-2005, 11:32 AM   #13
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I tried a spool for the first time last week, I followed precisely the setup listed on Losi site (Losi XXX-SGreg Hodapp,I believe) the car was tough to drive and had horrible oversteer.

I went to an old RC Car Action Magazine and read an article by their main tech guy; who says a spool is much harder to drive and gives minimal if any benifits.

I come here and people say a spool causes some under steer but is easier to drive than a diff or a one way.
Someone says don't use a spool on asphalt yet all the spool setups on the Losi site are for asphalt races.

I hear people say a one way is very difficult to drive because you only have rear wheel braking, and then I hear someone else say that with stock on larger asphalt you don't use brakes.

Well which is it?
Is a one way difficult in general or only if you are used to not driving a one way. Is a spool easier or harder to drive than a diff?

If you are just starting out are you better off with a diff and the stock setup in the instructions?

Are the race winning setup sheets you see on maufactures web sites for the pro drivers primarily and not necessarily best for the novice driver?
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Old 07-18-2005, 12:17 PM   #14
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Spool is very easy to drive with the right setup. I mailed with Andy Krämer today, he said (for the pro4) you should remove the rollbars in front, use softer springes and lower the rollcenter.
One Way should be the fastet at nearly every track. You don't have to brake if you use a one way, because your car will have enough steering and a stable rear....
I don't like racing with a diff, the car doesn't accelarate as fast and stable as with an spool or oneway. You will loose a lot of speed out of the corner if one wheel starts to spinn free, maybee if you hit a curp or your car istoo soft...
Time for a beer....
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Old 07-18-2005, 01:27 PM   #15
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People have different opinions on the diff/spool/one-way thing because of different driving styles.Let's examine what each does and how it relates to actually driving the car.

One-way= Ok, one-ways increase off-power steering...They also help turn-in.So ask yourself...does my car turn-in well? Do I need more? Is my off-power steering adequate? Do I use the brakes alot?

Spool= The spool gives you massive on-power steering, but hurts turn-in.The spool also gives you back the use of your brakes, Biggest downsides are understeer early, a lil tight mid-corner, but blazing speed off the corners.
So again ask...is my on-power steering good, or do I need more? Do I like to use the brakes?

Diff= The diff is the middle ground..Not as much turn-in as the one-way...not near as much exit speed as the spool.However the diff can be adjusted.Need more on-power...tighten the diff...need better turn-in response..loosen the diff.It will never have all the good points of either the one-way or spool, but it won't be horrible either.

Now PRO level racer's have styles, they know how to adjust their style to any particular track using the above tuning aids.The average racer doesn't have the knowledge to adjust in the same manner so it's best to examine your own track and your own style before making a decision on which way to go.

I run a PRO4 with a spool on asphalt.I tried the one-way ,but the car had too much turn-in and plus I like brakes.I was willing to give up some turn in to get my brakes back + I needed better exit speed. I went to the spool and I have never been happier.

Most modern sedans can be adjusted to compensate for the weakness of the spool or one-way.The goal is to make the car solid and easy to drive.Ask yourself what you want the car to do better.Then decide,,,drive it,,and adjust from there.Always fix the worst problem first, then move to smaller concerns.
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