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Old 06-16-2006, 10:52 PM   #301
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Quote:
Originally Posted by SpeedyDad
What size are the bearings in the steering rack?
Tamiya 850 size = 5x8
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Old 06-16-2006, 10:57 PM   #302
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Thanks.
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Old 06-18-2006, 01:19 AM   #303
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A quick race report. Last night I ran the car again on the super-rough track where the DI made its debut. The layout had changed, there were some smoother parts - but the rough stuff was still bloody rough

Anyway, I'm pleased to report that I have managed to improve the cars handling quite a bit, though the biggest bumps were still too much for the car.

A few notes:

I can't recommend the DF-02 shocks for racing. I have had the small bushing in the rear shocks collapse on a few occasions - due to crashes or hard landings from jumps. I changed from the white low-friction ones to the black standard ones but still suffered the same problems. So far this has only occured on the rear, where the shocks have a greater load.

Some guys are running B4 shocks on their DI's - my advice is to do that.

I hope the new DF-03 shocks do not use the same seal components!

I have had a few issues with my rear diff slipping - I suppose understandable considering the roughness of the track and the fact that I dont have a slipper yet. I could also have a faulty locknut because I put some superglue on it and everything now seems ok.

Drivetrain otherwise seems super strong No gear wear, diffs still smooth, no stripped bevel gears (even when landing from jumps with the throttle on!).

Front shock tower seems to be a bit of a weakpoint. I fractured mine on the first meeting, but it's held together ok since then, mainly because I have bolted my carbon tower to it - which would add quite a bit of strength.

The Five-Stars or GPM towers should both fix this.

Rear shocktower is very strong - no doubt the flex in it is preventing any breakage. My 2-piece carbon tower worked perfectly, being both stiff and tough

I'm still not convinced about the jumping performance yet - with some jumps it seems very difficult to keep the nose up. I'll have to wait until I get to a smoother track with decent jumps before I can get a more accurate idea of how well it does jump.

I'll try and post a setup later.
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Old 06-18-2006, 01:35 AM   #304
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I also got a chance to do some practice running with my DI today at SRS (where they run the Cactus Classic) and the buggy did pretty good. I'm running the B4 shocks on mine and they work well. The rear springs I have on it are too stiff so the back end wanted to bounce up a bit more than it should. I'll correct that next time out. The track was pretty loose (not watered) and the back end kicked out in the loose stuff. I will probably add a little weight to the rear and the lighter rear springs may help this too.

As far as durability, I am a relatively new racer so I hit things more often than I should. So far the DI has held up with no broken parts. I've landed it square on the nose and smacked it sideways into brick walls with no damage so far. I have landed it upside down on the front tower with no cracking yet. I do have a spare just in case.

I really hope they get the one-way diff soon. It would really enhance this buggy. There were some turns that the buggy got sliding sideways, because the front end was still coupled to the rear, that would have been tamed by a free-wheeling front end.
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Old 06-19-2006, 04:49 AM   #305
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Ok, here's my setup.

Probably not much good to anyone unless you're racing on a tight, rough track but I thought that it at least shows what changes I've made so far
Attached Files
File Type: pdf DI_hobbystation_Jun17.pdf (49.0 KB, 242 views)
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Old 06-19-2006, 10:36 PM   #306
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At least one of the new Tamiya hopup parts has hit eBay from Japan:

http://cgi.ebay.com/53924-Tamiya-DF-...QQcmdZViewItem

I ordered one so we'll see how it is. Now I want the front one-way and a slipper. I still haven't heard back on the B4 one. Maybe I'll sent him another email.
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Old 06-22-2006, 07:04 PM   #307
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Just FYI - Wheels from a Kyosho ZX-5 fit the DI. The tire and wheel combo feels lighter than the DI combo. It does appear the offset is different. The ZX-5 wheels will make the buggy a little wider
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Old 06-23-2006, 01:02 AM   #308
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Then if you intend to race it, you need to check the overall width.
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Old 06-24-2006, 04:11 AM   #309
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According to IFMAR Rule Book page 12 (you can read the entire book here ) about general specification said that:

Maximum overall length should be 18 inches (457.2 mm), width should be 9.84 inches (250.0 mm), and height should be 8 inches (203.2 mm)

check if using Kyosho ZX-5's wheel makes DI still within IFMAR's width.
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Old 06-26-2006, 09:42 AM   #310
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Default any tips?

hi to all the dark impact players!

i just got my kit and am wondering what are the spare i should get? spare or upgrades... pls advise... very new to RC... :P

thank you...
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Old 06-26-2006, 09:55 AM   #311
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Slipper shaft, either the one from RW Racing which uses B4 parts or weight for the Tamiya one, DF-02 Tamiya CVD's (they got to be Tamiya as they are designed to work with shorter outdrives, aftermarket ones use a shorted driveshaft).

Thats about it for now.
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Old 06-26-2006, 06:38 PM   #312
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Does anyone know when Tamiya's "Coming soon" slipper clutch will arrive???? Thanks.
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Old 06-26-2006, 09:47 PM   #313
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Default DI Slipper Clutch

I thought that the slipper clutch for the Dark Impact was to be released on June 30, 2006. I actually got the car when it first hit the shelves in late April. However, I have been waiting for the slipper and some additional hop-uo parts to become available before building the kit. Has anyone raced the DI (stock gearbox) in competition? Just curious to see how it compared to the other 4wd race buggies.

Thanks
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Old 06-27-2006, 01:08 AM   #314
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It goes well in kit form but the rear diff takes quite a hammering without the slipper unit.
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Old 06-28-2006, 03:32 AM   #315
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Well I've had a few issues with dodgy ESC's but here is my Dark Impact - ready and waiting for some more bling - namely Tamiya's new shocks.

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