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Old 04-19-2004, 12:14 PM   #3706
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Unhappy Tweak

Hi guys, ive been following this thread and most of you have said your car has tweaked out fine. Im having a few probs with tweak on my Pro4 tho, if I take the body posts off and rest the car upside down on a flat surface, 3 of my shock towers will touch the glass, the other one wont
I have tried undoing the topdeck and screwing it back up again on my glass, and I have treid to fiddle around with the diffcase screws on the bottom of the chassis but I still cant get anywhere with it. The main chassis and updeck on their own seem perfectly flat its when its all screwed up tight that I have the problem.
It is very noticable too, when I accelerate the car pulls to the left, when i lift of the throttle it pulls to the right.
Could it perhaps be the diffcases or even mis aligned holes in the chassis?
I am no expert at this and any advice as to un-tweaking would be a great help.
Thanks.
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Old 04-19-2004, 12:28 PM   #3707
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Try tightening the screws down with the wheels off whilst applying pressure to the car to keep it flat.

I have done this method, and although it is pretty tricky it seems to solve the problem.

My Pro 4 is on rails around my local indoor carpet track, only broken a few bits so far...however I did break a C-Hub and steering block in a rather tame crash
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Old 04-19-2004, 12:32 PM   #3708
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I have tried it, but will try again.
Thanks anyway.
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Old 04-19-2004, 12:35 PM   #3709
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Is it fine without the top deck attached?

It could be that the holes are slightly out on the top deck, do they all line up when you just place it on the top?

Also, you could try turning the top deck upside down and using countersunk washers, I know a few people have done that to solve the tweak problem...including Hara.
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Old 04-19-2004, 01:01 PM   #3710
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Quick question...

Just got a Pro4, what do I need to drop a diff in the front instead of the one-way?

Does HPI sell a full diff kit or do I have to buy the parts individually? If there is a diff kit, whats the part #?

Thanks...
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Old 04-19-2004, 01:12 PM   #3711
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HPI do a ball diff set which includes everything you need to build up a ball diff for the front. You also get spare outdrives for the main shaft and a spare plastic pinion bevel gear.
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Old 04-19-2004, 01:28 PM   #3712
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Anyone know a shop in the USA that has arms in stock?
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Old 04-19-2004, 02:09 PM   #3713
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Quote:
Originally posted by Skill
HPI do a ball diff set which includes everything you need to build up a ball diff for the front. You also get spare outdrives for the main shaft and a spare plastic pinion bevel gear.
Thanks Skill.

If anyone has a part no. please share it. If not, I'll start the search with the Pro4 manual and other included sheets.
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Old 04-19-2004, 02:15 PM   #3714
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HP75141 Is the complete Ball diff kit. KThobbies has them in stock.
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Old 04-19-2004, 02:32 PM   #3715
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Quote:
Originally posted by cHckbOY5
u didnt even file the slots for the batts?
no, no...I just didn't file down the slots where the tape passes through.
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Old 04-19-2004, 03:04 PM   #3716
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Quote:
Originally posted by rayhuang
HP75141 Is the complete Ball diff kit. KThobbies has them in stock.
Thanks...
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Old 04-19-2004, 04:13 PM   #3717
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SpeedTech R/C may also have them.. I know they did at one time..
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Old 04-19-2004, 04:16 PM   #3718
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Tower Hobbies has them in stock.
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Old 04-19-2004, 04:31 PM   #3719
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The HPI diff kit does NOT come with bearings so you will need to pick up 2..
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Old 04-19-2004, 04:34 PM   #3720
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Can anyone Post a setup for foams on Med/ bite asphalt. any help would be greatly appreciated.
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