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locking a F1 diff

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Old 05-27-2018, 11:38 AM
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Hows the best and or easiest way to lock a diff up for black carpet?
I'm building a Serpent F110 SF3
Looking for pics on how to mount or pin the spur gear, and right side hub together to the left diff half / axle shaft.
Not worried about it not be reversible as I'll probably only run indoor carpet with this car
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Old 05-27-2018, 11:49 AM
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Easiest and best way is to buy a spool from High velocity RC. Check their FB page. It will be the lightest and cleanest setup. You'll need another clamping hub too. Not the cheapest setup but meets your criteria of easy/best.
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Old 05-27-2018, 12:00 PM
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Tamiya part 54424, 3x3mm bushings - for ball diffs. Just replace your diff balls with these. Works perfect. Couldn't find these in the US.
Bought on Ebay, came from Japan.
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Old 05-27-2018, 07:36 PM
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Could someone explain how locking the diff in a 2wd car makes it handle better? I don’t understand this?
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Old 05-27-2018, 08:09 PM
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Traxxas slipper friction pegs Part # TRA4685
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Old 05-27-2018, 08:23 PM
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Originally Posted by theproffesor View Post
Could someone explain how locking the diff in a 2wd car makes it handle better? I don’t understand this?
If traction is super high, in a fast corner the inner wheel lifts off the ground slightly while the outer wheel maintains contact. So, no diff means power directly on the gripping rear wheel without any differential action thus maintaining full available power. Generally, from what I understand, the rest of the car needs to have a soft setup to maintain stability on straights and slower turns.

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Old 05-27-2018, 09:02 PM
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I drove someone else's Xray F1 a week ago and I drove it pretty hard (had lots of steering and was diffing out or lifting slightly like mentioned) but still was planted and the best f1 I have driven as far as it can actually steering when I want. I asked him If I could try a locked diff and I went 2-3 tenths constantly quicker after the change It was perfect for me be he couldn't drive it with out some set up changes after. Def give it a shot F1 crowd, on the black carpet and see if it's for you.

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Old 05-28-2018, 12:07 AM
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Would this be any good on asphalt?

Originally Posted by DaSilva3525 View Post
I drove someone else's Xray F1 a week ago and I drove it pretty hard (had lots of steering and was diffing out or lifting slightly like mentioned) but still was planted and the best f1 I have driven as far as it can actually steering when I want. I asked him If I could try a locked diff and I went 2-3 tenths constantly quicker after the change It was perfect for me be he couldn't drive it with out some set up changes after. Def give it a shot F1 crowd, on the black carpet and see if it's for you.
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Old 05-28-2018, 12:23 PM
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Don't think the car handles better, just a little different. I don't run on asphalt, but on a high traction surface like CRC black carpet, the car comes out of the corner harder. And you never have to mess with the diff again!
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Old 05-28-2018, 01:42 PM
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Stick to the ball diff for asphalt.
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Old 06-01-2018, 12:13 PM
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Originally Posted by Quinny45 View Post
Traxxas slipper friction pegs Part # TRA4685
I finally remembered to pick up this part at the hobby shop. What is the setup to use this in the differential? IE, replace all or some of the balls with the pegs? This will be in a F1R3.
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Old 06-01-2018, 07:07 PM
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you need to cut the peg the same seize of the balls and if the inner ring of the spurgear touch the diff plate put it in the center. you play with the number of peg if you want just harder than a ball diff or nearly locked

and if only one ring of the spur touch the diff plate you need to remplace the balls by peg ( dont put grease the peg will slip ! )
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Old 06-05-2018, 09:04 AM
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Pegs are still not as good as a locked diff.
Just tap the inner diff ring pinned to the axle for 3mm and then screw the spur Gear to it.
Might have to unpin it and flip it to get it right but it’s not hard.
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Old 06-05-2018, 11:01 AM
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A quick and easy way to do it is to remove all balls, then put some 3M double sided tape on the both diff rings and tighten it down. May not be as light as other solutions, but it works, it's quick to perform and 100% reversible.

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Old 06-05-2018, 11:46 AM
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Originally Posted by Antimullet View Post
Pegs are still not as good as a locked diff.
Just tap the inner diff ring pinned to the axle for 3mm and then screw the spur Gear to it.
Might have to unpin it and flip it to get it right but it’s not hard.
Ths point of the pegs are not necessarily full lock. I like the fact that i can back off 100% lock and get a "heavy" diff if traction is not conducive to a full spool. Many club races are like this.

Horses for courses......
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