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Old 04-08-2004, 04:47 PM   #3226
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Happy BirthDay TROY! May you have many more Birthdays and a good R/c year
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Old 04-08-2004, 04:57 PM   #3227
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Happy BirthDay TROY! May you have many more Birthdays and a good R/c year
haha, thanks.

It's definately been one of the harder birthday's... Gary isnt the only one causing me trouble today.

I had two tests and a lab today. Major ouch..
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Old 04-08-2004, 05:12 PM   #3228
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Default Building the HPI Pro-4

Guys;

OK, I am at the Upper Deck installation phase and cannot stop the chassis from tweaking. I've tried all kinds of tightening sequences and as soon as I get a few turns on the screws, the Chassis is noticably tweaked.

Looking at the alignment of the holes in the Upper Deck to the mating holes in the lower Chassis assembly. You can see severe misalignment. No matter how I install the Deck Screws and tighten them, the Car starts tweaking.

I have never had this kind of problem before with any other double decked Car that I've owned.

Short of using a Sledge Hammer to fix the problem, anyone have some Ideas?

Thanks,
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Old 04-08-2004, 05:15 PM   #3229
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Default Re: Re: Building a Pro-4

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Originally posted by RCBuddha
Pops,

Don't forget, Tamiya's Clamping hexes work fine, and I've been using them for the last few races with no problems....SoCal had some blue ones if last I checked if you were interested.
I looked for them locally and So-Cal is further than I care to drive just for one part.
The Graphite Hexes worked out fine, just had to add an extra shim on the axles to take up the play.

Thanks,
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Old 04-08-2004, 05:20 PM   #3230
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Pops....where is it not lining up on the trans cases or the steering posts? If its the trans cases make sure that the case is fully closed and seated also that the two screws holding them together are not overly tightened leading to them pulling the holes out of alignment with the top deck. If its the steering post make sure that nothing is bent or that the they sit perfectly straight. Other then that maybe your top deck is off a little.
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Old 04-08-2004, 05:57 PM   #3231
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i have seen many pictures of cars with the upper deck turned over and using counter sunk washers and screws.

this supposedly eliminates some of the tweak.

worth a try i guess.
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Old 04-08-2004, 06:25 PM   #3232
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Default Re: Re: Re: TAMIYA ONE-WAY CF DIFF PLATE

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TeamPrP, I'd say to go ahead and start making the parts. Just be sure to send one my way for additional testing...
Good one!
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Old 04-08-2004, 07:46 PM   #3233
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Hey PRP
When are you guys gonna start making those chassis?
can we buy diffplate protoypes?
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Old 04-08-2004, 07:48 PM   #3234
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Default Upper Deck Tweaking

Guys;

I purposely bought the countersunk washers along with this Car just because I had read that there may be a problem .

I have tried it both ways and neither seems to make any difference. Seems like no matter what pair of screws I start with, as I tighten them down past 1/2 in, the Chassis starts lifting somewhere. If I try a cross pattern, it's even worse.

I am thinking that maybe the Upper Deck is defective. Both gearboxes fit together very nicely. I don't see where else the problem could be and the Chassis lays nice and flat without any screws in the Deck.

Even my flexable Pro-3 was very easy to keep straight when I installed an Upper Deck on it.
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Old 04-08-2004, 07:49 PM   #3235
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pops how about shimming it somewhere?
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Old 04-08-2004, 07:55 PM   #3236
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Quote:
Originally posted by Super Steve
Hey PRP
When are you guys gonna start making those chassis?

Yeah.....



Pops....I dont know then something is not right thats forsure. See if your LHS has another top plate instock and try it out and see if that fixes the problem. If it does send the defect one back to HPI.
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Old 04-08-2004, 09:44 PM   #3237
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super steve, thanks for asking. I had a little delay but will be getting the chassis kit prototypes back from machining by Wednesday hopefully sooner. Then it's off for fast and furious track testing on carpet with foams- MOD!!!

Sorry, I can't sell the prototype backing plates, unless you want to spend $65 on it
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Old 04-08-2004, 09:48 PM   #3238
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Pops I dont seem to have "this" tweaking problem with my Pro4,I guess I'm just one of the lucky few..
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Old 04-08-2004, 10:01 PM   #3239
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whaaaaaaaaaaaaaaa?
65 for the proto? I think i will wait

i hope the price of the production model to be much cheaper!
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Old 04-08-2004, 10:12 PM   #3240
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Default Re: Upper Deck Tweaking

Quote:
Originally posted by popsracer
Guys;

I purposely bought the countersunk washers along with this Car just because I had read that there may be a problem .

I have tried it both ways and neither seems to make any difference. Seems like no matter what pair of screws I start with, as I tighten them down past 1/2 in, the Chassis starts lifting somewhere. If I try a cross pattern, it's even worse.

I am thinking that maybe the Upper Deck is defective. Both gearboxes fit together very nicely. I don't see where else the problem could be and the Chassis lays nice and flat without any screws in the Deck.
Pops,

After tightening the screws down all the way, does the chassis sit flat on your setup board? Or is it tweaked? I've noticed that my chassis moves a little like your describing, but it always ends up flat on my setup board, once i'm done tightening.
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