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Old 06-02-2005, 12:04 AM   #11491
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Mostly with medium or low grip and fast motor tight diff would tend to lose traction. Check it yourself and you'll get the point. It's much harder to describe than to feel what it does.
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Old 06-02-2005, 12:58 AM   #11492
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if you have the rear diff ultra tight, you can do donuts going into and coming out of corners. Something else you can try, tighten the diff some more.

Get someone who has a Pro4 that handles well and see if they can drive yours and see what they suggest.
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Old 06-02-2005, 01:04 AM   #11493
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Quote:
Originally Posted by dontfeelcold
if you have the rear diff ultra tight, you can do donuts going into and coming out of corners. Something else you can try, tighten the diff some more.
so thats the pro's speed secret
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Old 06-02-2005, 03:34 AM   #11494
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How do you solve diff nut loosening up?
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Old 06-02-2005, 03:37 AM   #11495
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Quote:
Originally Posted by Geetoo
How do you solve diff nut loosening up?
If you rebuild your diff all the time, replace the little lock nut regularly
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Old 06-02-2005, 03:37 AM   #11496
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TC3 diff rebuild kit comes with a special nylon nut with a metal nut inside the nylon. never comes loose.
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Old 06-02-2005, 03:52 AM   #11497
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seconded
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Old 06-02-2005, 09:19 AM   #11498
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or just buy the new diff nut and screw kit
HPI #73522 should be in the states in a few weeks.

installing mine today.
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Old 06-02-2005, 09:21 AM   #11499
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I installed the HPI version yesterday and it works great! No more loose diff!
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Old 06-02-2005, 10:45 AM   #11500
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My '05 Spec / Hara edition:
with new 2.25mm upperdeck, motor mount, and new flourine coated Pro shocks.
Attached Thumbnails
Hpi Pro 4-pro4-spec-001.jpg   Hpi Pro 4-pro4-spec-002.jpg   Hpi Pro 4-pro4-spec-004.jpg  
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Old 06-02-2005, 10:49 AM   #11501
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Zombie, how much thicker is the motor mount, I remember reading they made it thicker to push the motor towards the front a few millimeters to help the front to back balance.
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Old 06-02-2005, 10:54 AM   #11502
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new motor mount is approx 2mm thicker.
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Old 06-02-2005, 11:07 AM   #11503
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I'm sure it's been mentioned in this thread somewhere already, but what is the 05 spec. I don't see that on the HPI site anywhere? How is it different from the original?
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Old 06-02-2005, 11:09 AM   #11504
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Quote:
Originally Posted by DOTMAN
I'm sure it's been mentioned in this thread somewhere already, but what is the 05 spec. I don't see that on the HPI site anywhere? How is it different from the original?
it's on the HPI Japan website

The USA/ Europe 2005 Spec Pro 4 will have the following:
All standard Pro 4 features
+2.5mm main chassis (original main chassis)
+new upper deck (as shown -- more lateral flex, same fore to aft stiffness, reduced chance of tweaking on impacts, with cone washers and o-rings over the steering posts as used by Hara)
+new motor mount (as shown)
+new shocks (fluorine coated, new bladders, new pistons, new shafts, as shown)
+Delrin diff out drives
+new 1 piece aluminum rear input shaft (combines spur adapter and shaft, with solid pins, much more rigid gear mounting, different than Japanese spec parts)
+new aluminum front input shaft
+new diff nut and new diff screw (larger screw size + T-nut)
+aluminum steering servo mounts
+Spool and One Way will be included
+full range of pivot block spacers to adjust block heights
+0, 2.0, 2.5 and 3.0 degree pivot blocks included
+Heavy Duty, Self Lubricating Ball Cups are also included
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Old 06-02-2005, 11:11 AM   #11505
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Quote:
Originally Posted by dizzy1
Zombie, how much thicker is the motor mount, I remember reading they made it thicker to push the motor towards the front a few millimeters to help the front to back balance.
I think that was only half the reason for moving it forward. the other reason was that the pinion grub screw would not make contact with the flat portion of the motor arm.
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