CF G2 with low CoG
 

After six years I decided to start tinkering with my old CF G2 Gorilla Maxx chassis.
I really never liked how the Plettenberg Bigmaxximum sat hi and off center so I decided to go the Center Diff way after much reading on this forum and bugging the hell out of Mike :whistle:

In the end after having spent hours designing a weak mount, Mike convinced me that his universal mount was the best (easiest and most effective) way to go.

Here is the (almost) final product geared way too high but hey, if ain't broke...break it.

Looks good and a Sexy motor !!!!

Ralf

As they say...age makes you sexy ( I think I just made that up for my own benefit).

Here are some more pics of the (almost) final product...

PS. The gearing is WAY too high, I barely hit 8,000 RMP and look at the ballooning.

Gearing Calculation
 

As I said earlier....way too high... 102 MPH???

Differential Ratio: 2.85
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 42
Pinion Tooth Count: 15
Total Voltage: 19.50
Motor KV: 2600
Tire Diameter (inches): 4.7
Tire Ballooning (inches): .35
Motor Current Draw: 100
Motor Coil Resistance: 0
Spur/Pinion Ratio: 2.8 : 1
Total Ratio: 7.98 : 1
Tire Circumference (inches): 16.96 inches (430.9 mm)
Rollout: 2.13:1
Total Motor Speed: 50700 RPM
Vehicle Speed: 102.07 mph (163.95 km/h)
Effective KV Value: 2600
KT constant: 0.52 oz-in/A
Motor Torque: 0.27 ft-lbs
Final Torque: 2.16 ft-lbs
Final Power: 1950 watts (2.6 HP)

Nice to see people are still using that setup! I remember when that idea was the latest and greatest.

Maybe you should instal truggy diffs to get the ratio up? Or just run that motor on 4S??

Daf

Good point but at this point I think I'm going to strap a GPS to it and see how fast it really goes until something explodes! Then try again...

I'm looking for smaller wheels/tires for a straight run on asphalt; does anyone have any suggestions?

if you have 17mm hexes, you can use wheels/tires intyended for the Inferno Gt and similar buggy-based road cars.

Nice to see your still kickin' Dafni!

Good idea Mike. Thanks for the tip.

Looking great. Cool truck with a cool setup.

I like the prolines road rage but they are too wide.
Better going with something like this as Mike suggested:
http://www.amainhobbies.com/product_...ith-Inner-GT-2

BTW I took the truck for a test run and there was a little cogging but barely perceptible. Went up to 11,000 RPM which was about 23 MPH and felt crazy fast but I loved how the front was lifting without loosing contact with the ground.

Good looking truck.:yes: Is that a schulze controller?

Yes it is. 18.97KW with a BEC attached on top. Somhow I have not yet been able to "fry" it...I'll keep trying :diablo:

With a setup like yours I think the Schulze is doomed.

Stay away from the roadrage tires on a highspeed setup like this. Pizzacutters was the word back then.
I would go the way Mike suggested, 17mm hex and buggy wheels/tires.

Yo, cheers Mike, good to know we're still here.

Since today I was able to take the truck out for a spin (video to be posted after edit) I was also able to un-glue the front tires after a couple of wheelies...:party:

The wheels I have now are all 14mm hex, could I just get a 17mm hex wheel with the appropriate pin or would that not work for some reasons?
I believe the CVD I have are MIP (old original not spline).

I run Traxxas 17mm hex's with Proline Badland, on the original shiny 2,5 MIP cvd's. I had to mod the Traxxas hex's a bit by drilling from the backside, to make them go far enough into the cvd.

http://billeder.rcgalleri.dk/galleri...llamaxx-e-maxx

Understood, thank you.

At this point I'm thinking of going XO-1 but I'm not sure on which wheels. I really like my aluminum ones but I'm not sure I want un-glue the rest of my tires and reuse them.

Nice looking truck!

I ended up getting HPI 17mm Hex which use the same size pin I already had (2.5 X 12) and a set of Sweep belted tires already mounted on black wheels. Not as nice looking as the aluminum ones but they feel really solid. I doubt the would balloon at all.

Given the smaller radius, the new theoretical speed is now 71 MPH. Let's see how hot the Schulze gets before I hit 50mph

Here is another option if you go with a 17mm hex. Monster truck/ Truggy belted slicks.

http://ipanemasports.com/MonsterSlicks.aspx
(stolen from snellemin)

Nick

That page didn't come up for me.
Can you repost it, I'm curious about the 17mm belted slicks.

Thanks,
- Justin

Good looking truck by the way

Try this one,

http://www.ipanemasports.com/Pages/M...uckSlicks.aspx

^^thanks nastety:yes:

Those monster slicks are perfect for monster speed runs. I sent ipanema an e-mail, just double checking that the Monster Slicks are indeed belted. If they are I am getting a set!

They look cool but at 139mm they are just about the size of the stock emaxx tire which would be way too high for the gearing I'm stuck with.

I may get a pair for my other Gmaxx though. Let's see what they say about being belted or not.

They are belted. All of the ipanema tires are belted.

If they Monster slics are to big look at the buggy slicks. They also make buggy size belted street tires, not slicks.

Nick

Yes, I saw those as well but I have to say, just got back from trying out the Sweep Slick 55 and I had a blast. No ESC overheating, a good degree of drifting until they warmed up a bit, much easier to drive.

Meanwhile I lost a wheel because the nuts are not right and the nylon part does not reach so they come loose easily. I'm waiting for the HPI nuts and hopefully they'll work better otherwise I'll need different CVDs.

I took an on board video which I'm hoping to find the time to edit.

You can spin those nuts and put the nylon part on first. If it's a flanged nut just use a washer for the flange. Also, loctite is your friend:yes:

Not a bad idea at all but it turns out that the flanged nuts I was using were just too big. I switched to the same M5 I had before and put a little washer instead. Now I have no problem...well not that problem anyway...

Must find a large parking lot with no cars...:whip:

first run of tires not belted
 

hope they fixed them
http://www.rctech.net/forum/monster-...-slicks-3.html
150 a set of 4