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Old 10-18-2011, 05:03 AM   #2656
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Originally Posted by kmas View Post
is the gear diff or ball diff better, I noticed you cant get metal out drives on the ball diff, does everyone run gear diffs/front and rear?
Nope. I have the gear diff in the rear and the ball diff in the front. To get good rear grip you need to run the rear diff loose and in order to get the ball diff like that it's very close to slipping. Once it slips it starts to get crunchy feeling real quick. I use light coat of grease on the inside gears and a shorten spring. Clipped the spring so it just holds the 2 inside gears apart but no pressure on them like the stock setup. Only problem is the metal outdrives notch pretty fast. Pretty much on par for HPI's soft drive cups.
In the front I have the ball diff medium tightness.
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Old 10-18-2011, 05:11 AM   #2657
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Hey guys, we just picked up three Cup Racers for our local track to try and spark up a budget spec class. I also picked up three sets of EZrun/Tacon gear and 3000mah 2s hardcase packs for them. I went with the finned 540 size 2100Kv Tacon so we can keep the speeds low and try to keep them running well on our "bumpy" on-road style track which was originally built for RC18s.

I was wondering if we should have any durability issues with such mild setups which will only be geared for 18-20mph. I have read several posts about the drive cups, but it would be nice if we could run these stock.
I have not broken the drive cups at the wheels but I have broken the shock shafts twice. The orange rear hinge pin plate at the front end gets bent if you hit the front wheel so you should double it up.
The plastic center front drive cup can break the 3 interlocking fingers. Get the Exotek hard coated Aluminum one.

Btw I'm running 17.5t boosted so I think your choice of motor/esc should be fine.
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Old 10-18-2011, 05:18 AM   #2658
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Hi all, have been reading the thread with much interest. Got hands on the hpi cup racer drift version a while ago. Have added exotek carbon chassis, stood the front shocks up instead of laying down etc. Have now got it set up for racing, running 13turn brushless which runs well.
Am having an issue with the tail being really twitchy and wanting to spin out when running into corners. Not real sure what to do, have tried different springs, different shock positions etc
has anyone else had this issue?
Are you loose going into or accelerating out of the turn?
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Old 10-18-2011, 06:12 AM   #2659
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Are you loose going into or accelerating out of the turn?
tends to want to spin when turning in, so have tried to adapt by letting it roll though, but then when getting on throttle it also tends to loose the rear end. Its a bit perplexing, havent had anything like it before.
forgot to add am running the abc tyres and rims, sway bars etc
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Old 10-19-2011, 11:20 PM   #2660
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Try these:

  • More rear toe (3 degrees)
  • Stiffer front springs (pink)
  • Thicker front shock oil (70wt)
  • Softer rear springs
  • Thinner rear shock oil
  • Use outer most hole on optional front shock tower
  • Lay rear shocks down a hole
  • Lower rear rollcenter (upper hole for camber link in rear shock tower)
  • Raise front rollcenter (remover plate under front upper arm pin holder)
  • Looser rear diff
  • Tighter front diff
  • Remover the rear swaybar
  • If you sauce the tires do full for the back and inner 1/4 to 1/2 for the front
  • Use some front toe out
  • Use front anti-dive
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Old 10-20-2011, 03:22 AM   #2661
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Cheers, appreciate the assistance, will start working way through the list and see what can be done
thanks :-)
Quote:
Originally Posted by Sydewynder View Post
Try these:

  • More rear toe (3 degrees)
  • Stiffer front springs (pink)
  • Thicker front shock oil (70wt)
  • Softer rear springs
  • Thinner rear shock oil
  • Use outer most hole on optional front shock tower
  • Lay rear shocks down a hole
  • Lower rear rollcenter (upper hole for camber link in rear shock tower)
  • Raise front rollcenter (remover plate under front upper arm pin holder)
  • Looser rear diff
  • Tighter front diff
  • Remover the rear swaybar
  • If you sauce the tires do full for the back and inner 1/4 to 1/2 for the front
  • Use some front toe out
  • Use front anti-dive
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Old 10-20-2011, 10:14 AM   #2662
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I think its probably the first thing on that list.
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Old 10-20-2011, 12:58 PM   #2663
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Originally Posted by mingnon View Post
tends to want to spin when turning in, so have tried to adapt by letting it roll though, but then when getting on throttle it also tends to loose the rear end. Its a bit perplexing, havent had anything like it before.
forgot to add am running the abc tyres and rims, sway bars etc
Check droop.. If your front has a droop of 2, rear should have 1.

Also does it spin turning left and right?
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Last edited by Raman; 01-02-2012 at 12:32 PM.
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Old 10-20-2011, 03:40 PM   #2664
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Originally Posted by Raman View Post
Check droop.. If your front has a droop of 1, rear should have 2.

Also does it spin turning left and right?
Yes, it is consistant in its ability to spin.
changed shock oil, removed bay, moved shock position, raised rear roll centre, loosened rear diff and removed swaybar.
Heading out to give it a run and continue the tweaking
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Old 10-20-2011, 08:48 PM   #2665
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Whats your rear toe at?
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Old 10-21-2011, 10:59 AM   #2666
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Default diff pro4 mod

hey guys, I read about this (pro4 diff mod) some time ago, what is the over all feel of this, do you guys still to this? Just wondering if this is worth doing and maybe a little updated info on this...thx
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Old 10-21-2011, 06:10 PM   #2667
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hey guys, I read about this (pro4 diff mod) some time ago, what is the over all feel of this, do you guys still to this? Just wondering if this is worth doing and maybe a little updated info on this...thx
I run / race mine with stock diffs and it works just fine. I race using a ballistic 21.5.
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Old 10-21-2011, 11:54 PM   #2668
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I just got one from a friend of mine, runs great, but one problem. The front left tire will lock itself back when you turn it hard left. It will get stuck. I have to go to the car and turn the tire by hand than it is fine. Kinda hard to explain lol... Any ideas. It's almost like it has to much travel
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Old 10-22-2011, 12:01 AM   #2669
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Originally Posted by snoopyrc View Post
Whats your rear toe at?
am using the 3deg insert into the rear hub, have done just about everything else mentioned above except changing the springs, am ordering now and have also ordered the front shock tower as thats about the only part not i dont have (and spring)
im just wondering if it is something to do with this car being the drift version
will keep experimenting
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Old 10-22-2011, 11:55 AM   #2670
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I run / race mine with stock diffs and it works just fine. I race using a ballistic 21.5.
just curious if anyone was running the pro4 diff and how it performed.
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