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Old 08-15-2016, 05:53 PM   #11236
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The gear diff makes it easier to drive the car more aggressively and helps if traction starts to go away. I also run 13.5 exclusively at our track and our lap times are only just slightly slower than the guys who run Mod.
100% I run center diff at every single track. In fact when i built my 16 spec I put the center diff in from my 15 right from the start. I did try the new slipper once for a round and I hated it. took it out and put the center in and boom the car was back on rails.


P.s I have a xb8e 16spec on the way. saying goodbye to the kyosho mp9e which was a great great car and hope the xb8e lives up to what the mp9e was.
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Old 08-16-2016, 07:07 AM   #11237
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Recently picked up a used 15 with centre diff plus slipper. First kit I've had that has a centre diff

Is it crucial to use xray screws because when I got this kit it didn't have 3x5 screws for the centre diff. I had some from another kit but Im thinking the xray button head screws are a lower profile than other brands. When I'm turning the diff it seems at one point it's possibly catching the motor mount screw (also some random button head screw I'm using). Of the 4 screws on the diff, I had two screws with a lower profile and it doesn't seem to always catch on something when I'm turning the diff by hand

Also is it normal when meshing a centre diff by hand that it sounds a bit louder due to the locked feel of a diff? Not sure what oil was previously used but the slipper definitely has a smoother mesh plus also the centre diff is the 78t versus 81t (slipper)

Ok went back a few pages and saw others with the same problem.
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Old 08-16-2016, 11:12 AM   #11238
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I don't. I've only seen him drive an xb4 1 time. Regarding the 4dot 3dot or 3dot2dot setup, those both worked for me on high bite running slicks. On medium bite, I was way better off with softer springs and the higher oil with alittle rebound. No more chassis slapping. I chassis slapped more with 4 dot front 3 dot rear. Must be the rebound
which cups do you use with the avid springs?
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Old 08-16-2016, 11:49 AM   #11239
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which cups do you use with the avid springs?
The stock cups work fine.
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Old 08-16-2016, 11:50 AM   #11240
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The stock cups work fine.
i thought you had to use either the avid cups or the AE mid sized ones?
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Old 08-16-2016, 12:51 PM   #11241
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i thought you had to use either the avid cups or the AE mid sized ones?
Not that i am aware of. The avid springs work just fine with the stock cups.
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Old 08-16-2016, 01:00 PM   #11242
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Not that i am aware of. The avid springs work just fine with the stock cups.
hmm weird i heard they were different lengths than the stock xray
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Old 08-16-2016, 01:13 PM   #11243
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think the ride height may be hard to get low with the stock cups... in any event the ae cups are so cheap and work great.

BTW - why is the gear diff such a necessity. How does it help in low bite? Especially in 13.5 . You'd think if this were the case a lot of 2wd would use them. Just trying to save on an unnecessary expense if at all possible
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Old 08-16-2016, 01:22 PM   #11244
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think the ride height may be hard to get low with the stock cups... in any event the ae cups are so cheap and work great.

BTW - why is the gear diff such a necessity. How does it help in low bite? Especially in 13.5 . You'd think if this were the case a lot of 2wd would use them. Just trying to save on an unnecessary expense if at all possible
even on high bite clay and anything looser the center diff helps lock in the rear and allow the car to rotate smoothly like its on rails.

for me the slipper on clay or looser the rear was very hitchy. once i put the center diff in it allowed the car to rotate fast and smooth! make sure to use 500k cst oil at least. these cars like to remain balanced.
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Old 08-16-2016, 03:25 PM   #11245
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even on high bite clay and anything looser the center diff helps lock in the rear and allow the car to rotate smoothly like its on rails.

for me the slipper on clay or looser the rear was very hitchy. once i put the center diff in it allowed the car to rotate fast and smooth! make sure to use 500k cst oil at least. these cars like to remain balanced.

Ive ran as low as 100k in the center diff and it worked great. actually it was so easy to drive it wasnt even funny. I will say that I have better fast lap times with 300k or 500k in but sometimes my overall time for a round is better with a low weight simply because its just easier to drive more consistent.
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Old 08-16-2016, 03:56 PM   #11246
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Ive ran as low as 100k in the center diff and it worked great. actually it was so easy to drive it wasnt even funny. I will say that I have better fast lap times with 300k or 500k in but sometimes my overall time for a round is better with a low weight simply because its just easier to drive more consistent.
i prefer 500k-1mil

i also run the steel internal diff gears too which i think makes the oil feel a tad thinner.
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Old 08-16-2016, 05:34 PM   #11247
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Thank you! Sold. I'm getting one.
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Originally Posted by lyons238 View Post
even on high bite clay and anything looser the center diff helps lock in the rear and allow the car to rotate smoothly like its on rails.

for me the slipper on clay or looser the rear was very hitchy. once i put the center diff in it allowed the car to rotate fast and smooth! make sure to use 500k cst oil at least. these cars like to remain balanced.
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Old 08-16-2016, 06:06 PM   #11248
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Thank you! Sold. I'm getting one.
you wont regret it! definitely one of my favorite setup changes to the car on dirt.

carpet i prefer the slipper but clay, wont run it without the center diff. enjoy!

also, try the steel internal diff gears for a smoother car as well, it keeps the inirtia moving and just kinda adds to how the car already handles like it's on rails. it also feels a little less twitchy with the steel diff gears. i run the steel in the front center and rear.

also like i said i think the diff oils act more true with the steel diff gears, with the graphite, sometimes it just feels kinda different, not as preferable IMO. i know all the team drivers use steel gears on all surfaces.
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Old 08-16-2016, 06:25 PM   #11249
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Looks like my 4wd game is about to get more expensive. Been driving stock 2wd with my xb2 so am trying to duplicate as much of a planted rear end feel as i can get coming from stock 2wd with no 4wd experience. thx
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Old 08-16-2016, 06:38 PM   #11250
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Originally Posted by lyons238 View Post
you wont regret it! definitely one of my favorite setup changes to the car on dirt.

carpet i prefer the slipper but clay, wont run it without the center diff. enjoy!

also, try the steel internal diff gears for a smoother car as well, it keeps the inirtia moving and just kinda adds to how the car already handles like it's on rails. it also feels a little less twitchy with the steel diff gears. i run the steel in the front center and rear.

also like i said i think the diff oils act more true with the steel diff gears, with the graphite, sometimes it just feels kinda different, not as preferable IMO. i know all the team drivers use steel gears on all surfaces.
When changing out the gears to the steel ones do I need to change out the the cross pins to steal to or can I leave it at the graphite plastic one
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