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Old 07-01-2009, 11:58 AM   #646
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I can't believe how much of a difference the diff really makes... so underrated!

I had been budget racing and re-using some clearly shot rings, thinkin it'd be no big deal, but after pulling my hair out all day looking for rear grip@ the track I rebuilt my diff w/ some new rings (bfast of course) and my car went from loose all over the damn place to pushing to the wall!

so after un-doing everything I had previously done to look for more rear grip my car felt the best it had in MONTHS! (diff rings were about 2 1/2 mo old)

I was on the stand with a shizzle eating grin for the rest of the day.

so does anyone have advice on how to keep their diff from getting blown out? or is this just a suck-it-up and rebuild it regularly kinda thing?

ps... just ordered more rings, and figured I'd try the lubes too for the shootout @ HRH next weekend... send me some lucky ones pleeez!
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Old 07-01-2009, 07:31 PM   #647
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Originally Posted by bpspeed View Post
I can't believe how much of a difference the diff really makes... so underrated!

I had been budget racing and re-using some clearly shot rings, thinkin it'd be no big deal, but after pulling my hair out all day looking for rear grip@ the track I rebuilt my diff w/ some new rings (bfast of course) and my car went from loose all over the damn place to pushing to the wall!

so after un-doing everything I had previously done to look for more rear grip my car felt the best it had in MONTHS! (diff rings were about 2 1/2 mo old)

I was on the stand with a shizzle eating grin for the rest of the day.

so does anyone have advice on how to keep their diff from getting blown out? or is this just a suck-it-up and rebuild it regularly kinda thing?

ps... just ordered more rings, and figured I'd try the lubes too for the shootout @ HRH next weekend... send me some lucky ones pleeez!
Proper break-in and slipper settings are the best way to have your diff last the longest. With the B-Fast diff parts you will definately get a lot more use from the diff between rebuilds.
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Old 07-02-2009, 05:18 PM   #648
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Thanks Brian, you nailed it. Break-in and the slipper are your diffs best friend. Well.............. other than me
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Old 07-02-2009, 05:59 PM   #649
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Quote:
Originally Posted by bpspeed View Post
I can't believe how much of a difference the diff really makes... so underrated!

I had been budget racing and re-using some clearly shot rings, thinkin it'd be no big deal, but after pulling my hair out all day looking for rear grip@ the track I rebuilt my diff w/ some new rings (bfast of course) and my car went from loose all over the damn place to pushing to the wall!

so after un-doing everything I had previously done to look for more rear grip my car felt the best it had in MONTHS! (diff rings were about 2 1/2 mo old)

I was on the stand with a shizzle eating grin for the rest of the day.

so does anyone have advice on how to keep their diff from getting blown out? or is this just a suck-it-up and rebuild it regularly kinda thing?

ps... just ordered more rings, and figured I'd try the lubes too for the shootout @ HRH next weekend... send me some lucky ones pleeez!
Come by the Kyosho tent and ask for Kevin King I will introduce myself to you!
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Old 07-02-2009, 06:02 PM   #650
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How do you guys break your diffs in?
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Old 07-02-2009, 06:13 PM   #651
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Originally Posted by porkey View Post
How do you guys break your diffs in?

Here ya go!!

B-FAST R/C PERFORMANCE
Differential Break-In Procedure
1) Clean all parts and work area

2) Follow owners manual for assembly instructions

3) Lightly Coat Diff Balls with Pro Diff Lube, thoroughly lube Thrust Bearing with
Pro Thrust Bearing Lube. (or equivalents)

4) Snug diff screw just until gear will not turn while out drives are held.

5) Assemble transmission per manual

6) With assembled transmission in car and car on a stand, hold one rear tire while lightly applying the throttle for about 20 seconds (about 1/4 throttle, No tire swell). Repeat while holding opposite tire.

7) Tighten diff screw about 1/16 of a turn and repeat step 6

8) Repeat step 7 at least two more times.

9) Slowly loosen diff screw a little at a time so rear tire turns with little or no resistance while holding the opposite tire.

10) Slowly re-tighten diff screw a little at a time until resistance is felt while turning one tire and holding the opposite.

Drive car and adjust diff to suit your driving style.
Do Not let the Diff Slip at anytime!!
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Old 07-02-2009, 07:33 PM   #652
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Hi Fred.
I got a new ride, I have a Losi XXX 2wd buggy. I will be needing some new parts.
See you at Classic tomorrow.
2wd seems to be the new hot class.
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Old 07-03-2009, 01:15 AM   #653
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Hi Fred.
I got a new ride, I have a Losi XXX 2wd buggy. I will be needing some new parts.
See you at Classic tomorrow.
2wd seems to be the new hot class.
Hey there Doug

Congrats on the new buggy. I will see you at Classic.

Fred
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Old 07-06-2009, 07:02 AM   #654
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Good Luck to the "regional" locals, Dan Griffin and Brian Mills, who are going out to Hot Rod this coming weekend.
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Old 07-06-2009, 07:11 AM   #655
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Quote:
Originally Posted by porkey View Post
How do you guys break your diffs in?

I'm still trying to find the perfect method for this. Fred's explanation above is pretty solid but I'm trying to improve it a bit. I break my diffs in with a drill before I put them back in the car. I used to tighten the screw all the way down and then back it off slowly, running the gear with the drill between every 1/8th to quarter turn of the diff screw. Lately, I've been starting with the screw just tight enough to where it won't slip and then running it in the drill for about 30 secs, then tightening it a little at a time until it feels right. This seems to work better than tightening it down all the way first which could start you off with flat spots right off the bat and seems to be a little more forgiving on the thrust bearing as well. By the way Porkey, I like the Megan Fox picture! HA!
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Old 07-08-2009, 10:44 AM   #656
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hey, just wanted to reiterate what I know I've read on here previously...

you probably need to keep an eye on your spring in the diff under the t-nut.
I built a new car about 6 mo back, so it isn't that old, but having read it, and having recently realized how little love my diff had been getting, I decided to go ahead and new it all up, new thrust bearings, rings, tnut, and spring

my old diff spring was about 1/8 -3/16th of an inch shorter than the new one even after I had compressed it a few times with some pliers...

the thing looked like it was completely compressed just sitting on my table!

any idea what a regular time frame for replacement on this little puppy is?

by the way, I'm talking about an AE diff.
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Old 07-09-2009, 02:56 PM   #657
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Good Luck to the "regional" locals, Dan Griffin and Brian Mills, who are going out to Hot Rod this coming weekend.
I second that!!
Good luck to two other B-FAST team members that will be at Hot Rod, Brian Kinwald and Kevin King.

Go get'em boys!!
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Old 07-09-2009, 02:58 PM   #658
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Originally Posted by scott54 View Post
I'm still trying to find the perfect method for this. Fred's explanation above is pretty solid but I'm trying to improve it a bit. I break my diffs in with a drill before I put them back in the car. I used to tighten the screw all the way down and then back it off slowly, running the gear with the drill between every 1/8th to quarter turn of the diff screw. Lately, I've been starting with the screw just tight enough to where it won't slip and then running it in the drill for about 30 secs, then tightening it a little at a time until it feels right. This seems to work better than tightening it down all the way first which could start you off with flat spots right off the bat and seems to be a little more forgiving on the thrust bearing as well. By the way Porkey, I like the Megan Fox picture! HA!

Please keep us updated when possible Scott.
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Old 07-09-2009, 03:02 PM   #659
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Quote:
Originally Posted by bpspeed View Post
hey, just wanted to reiterate what I know I've read on here previously...

you probably need to keep an eye on your spring in the diff under the t-nut.
I built a new car about 6 mo back, so it isn't that old, but having read it, and having recently realized how little love my diff had been getting, I decided to go ahead and new it all up, new thrust bearings, rings, tnut, and spring

my old diff spring was about 1/8 -3/16th of an inch shorter than the new one even after I had compressed it a few times with some pliers...

the thing looked like it was completely compressed just sitting on my table!

any idea what a regular time frame for replacement on this little puppy is?

by the way, I'm talking about an AE diff.
Keep an new spring handy and check out the old one when you do a clean and relube of the diff/thrust.
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Old 07-09-2009, 04:31 PM   #660
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Fred I got the new kit today and man it looks really nice!

Too bad my old Bfast kit is still running so smooth! Wait....did I just type too bad?!?!?!? Hmmm,

I will put it in on the next rebuild. Time for a new spring here too I think.

See ya a the track soon!

Chris
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