Progress!

[Wooders28]

Finally made some progress with the Dark Impact project.

Specs so far:-

Shocks upgrade,

Cooling bars,

Main shaft hardened gear (machined out of helicopter pinion)

Yeah racing rear diff joint,

Yeah racing ceramic diff balls,

Yeah racing UJ's/rear shafts,

Slipper clutch,

Futaba S3010 servo

Castle Mamba max pro set up with 5700 Brushless motor,

3S Lipo Orion Rocketsport Battery.

She absolutely flies!!

Could do with a larger spur gear and small drive pinion,Castle recomend a 12-17t and the smaillest i can find is a 23t!

Only run on road so far as i know grass/off road will put extra strain through the motor running a high gear ratio.

Can anyone give me an idea as where to get large spur and pinion gears to suit a DF03 with a slipper?

At last!

Managed to get the on road shell painted:-

Although the airbrush gave a slatter as the aircan ran out it came out ok!!

[TA-Mark]

85 tooth spur and 19 tooth pinion is the limits of the DF03 gearing (13.67:1). That recommended pinion may not be aimed at a Tamiya, as different brands/models have different internal ratios.

From my gearing chart, with the 5700Kv, 21/85 (12.37:1) or 20/85 (12.99:1) should be about right.

The smaller 0.5 module pinions are from vintage models. Hard to find, but I've bought them before. #53080, #53081 and #53082.

[Will16]

Looking good !! The On-Road set up look cool!! What is your on-road body??

[Wooders28]

Cheers!

Its a parma gravedigger body.Masked off and then airbrushed the colour in.

Kind of cheated with the pic though,not finished making the body mounts (No holes or R clips) and had to use a pair of front wheels on the one side (you can see the mini spikes on the far side),as the rears are out of stock and aint arrived yet,but you get the idea!

Not sure if i like the Truggy look now i have done it though,have a Willys body also,so may paint that up and use that.This one may look better on my fusion.

Thanks for the ratio info.Will see if the parts are available,if not i need to have a proper look about and see what fits.There must be something available somewhere,even if it involves a bit of cutting,drilling or surface grinding!

Loving the 3s lipo though.Had to cut some of the chassis to get the cables nice and its a tight fit.but worth the effort.

[Wooders28]

85 tooth spur and 19 tooth pinion is the limits of the DF03 gearing (13.67:1). That recommended pinion may not be aimed at a Tamiya, as different brands/models have different internal ratios.

From my gearing chart, with the 5700Kv, 21/85 (12.37:1) or 20/85 (12.99:1) should be about right.

The smaller 0.5 module pinions are from vintage models. Hard to find, but I've bought them before. #53080, #53081 and #53082.

Thanks for your replies

Managed to get the #53080 pinion set,now the problem is the motor wont get close enough to the spur for the teeth to engage!!!

The spur is an 82 tooth,as supplied with the slipper set,not sure if i can get bigger spur gears?

Back onto the 23t now.

Now having an issue with the ball diff since the upgrade!

Does anyone else have the issue of the bolt coming loose that holds the diff unit together?

All of a sudden i have a Front wheel drive car,which now its brushess,just means balloning tyres and not much go!

Should there be a thrust bearing at the cap head side to allow it to turn?

[TA-Mark]

You must use the 85T spur that would come in the DF03 kit in combination with the smaller pinions. DF03 kit comes with a 78T and 85T spur gears, the slipper set has the 82T spur. All three size spur gears work with either the kit mainshaft or with the slipper clutch. The smallest pinion that fits with the 82T spur is a 22T (11.39:1). 22/82 is the right ratio for the 4600Kv Mamba systems.

The diffs do have a thrust bearing (MA21 in the instructions). If your diff adjustment screw is coming undone, the thrust bearing is either damaged or blocked up with debris. I've had one crack after a side impact from another car while racing. Size is 620 or M2 x 6mm, Tamiya #49300.

Looks like this:

The slipper clutch must be set very good for running such power. 5700Kv Mamba and 3S is pretty extreme. The clutch must be able to slip before the ball diff willl slip, or you will melt the centres from the ball diffs.

[RS2RSR]

A 21t pinion will fit also. Atleast with Ezrun 8.5t motors.

I use Team Durango 81spur with a bearing. Thats 48 pitch so pinions are alot easier to get.

I use carbide balls for the rear diff and ceramic balls for the front. Some have problems with ceramic balldiffs slipping. Using carbide balls you can set the diff looser and still not slip. A front diff should be tighter so ceramic balls are fine.

[Wooders28]

The diffs do have a thrust bearing (MA21 in the instructions). If your diff adjustment screw is coming undone, the thrust bearing is either damaged or blocked up with debris. I've had one crack after a side impact from another car while racing. Size is 620 or M2 x 6mm, Tamiya #49300.

Looks like this:

Cheers Mark,

Embarrassingly,it turns out that in my haste to get the thing up and running again i didnt do 2 things.

1- Didnt bother with the manual

2- Didnt check the parts that came off

In my defence,i knew it needed a Thrust bearing,just not that i had left it still attached to the old diff joint!

I have not done a thing with the front diff,

Do i need to add Carbide balls to my list and put the ceramic's in the front?