A new toy for me!

[lincpimp]

Check this out:






Woot, woot!

Boua! boua! I would hope to see a Baja SS

[sikeston34m]

^5 High 5 Linc!

Hey that looks just like what the UPS guy brought me!

[phildogg]

not so fast guys, I have one on the way!!
phil

[lincpimp]

The 5b ss kit is not far behind! I really need to thin out my collection.

thats nice man.

so how long befor it goes brushless?

[Pliska]

Looks good, cant wait for my new E :)

[mkrusedc]

Linc,
How is the bulk chassis junction? It was supposed to have been strengthened. What does it look like?

[lincpimp]

Originally Posted by mkrusedc

Linc,
How is the bulk chassis junction? It was supposed to have been strengthened. What does it look like?

I have left the truck at work, but the chassis has a ton of extra webbing where it attaches to the bulks. I will have a good look at it tomorrow and get back to you.

[gixxer]

looks good, my lhs said they should have them on monday.

[sikeston34m]

It really looks to me like this chassis would hook right up to an older E maxx front and rear.

I haven't tried it yet, so there might be something different.

[suicideneil]

Nice man! Not that Im worried anymore since I love my new Gmaxx motor mount (old version), but can you get some measurements of the tranny mounts- I wonder how different the mounting pattern is. By all accounts though, the chassis and braces should bolt up perfectly to an older style Emaxx, as should the steering mech (so long as its 3.3spec).

[sikeston34m]

Hey Linc,

I'm Brain Storming again. LOL

Correct me if I'm wrong, but since the new E maxx has a Revo Style Slipper, won't the Revo Mod 1 Spur fit this?

Let's go with the 40 tooth Mod 1 Revo Spur. I notice Mike has those in stock. While we're ordering, let's get us a 25 tooth Mod 1 Pinion gear and maybe a 20 tooth Mod 1 as well.

Then let's turn to AXI for a 2826/10 Outrunner motor. The motor shaft length is exactly 20mm! Perfect for this. Let's get a motor cooling fan too.

I know this is a bigger heavier truck than the Redcat but now we've got gears AND a good slipper.

Here's some gear figures that I put together.

Stock E maxx

68 tooth spur 19 tooth motor pinion 3.58:1 gear ratio

If the motor spins 20,000rpm, the tranny input shaft is spinning 5587rpm

Revo

AXI 2826/10 GOLD LINE 920kv 3-5 Lipoly current capacity=42amps/60s

40 tooth Mod 1 spur 25 tooth pinion 1.6:1 gear ratio

4S Lipo = 14 volts under a load 12,600rpm @ 900kv

7875 input shaft rpm with a 25 tooth pinion.

6300 input shaft rpm with a 20 tooth pinion

I'm really tempted to try this setup.

I wonder what the gear ratio is inside the tranny from input shaft to output shaft?

I'm thinking gearing it high like this will be best because the outrunner will make so much more torque than both the Titans. Then add the 2 speed kit to the equation. We've got Gears!

What do you think Linc?

[lincpimp]

Originally Posted by sikeston34m

Hey Linc,

I'm Brain Storming again. LOL

Correct me if I'm wrong, but since the new E maxx has a Revo Style Slipper, won't the Revo Mod 1 Spur fit this?

I wonder what the gear ratio is inside the tranny from input shaft to output shaft?

I'm thinking gearing it high like this will be best because the outrunner will make so much more torque than both the Titans. Then add the 2 speed kit to the equation. We've got Gears!

What do you think Linc?

Revo spurs will fit, not sure if the tranny has enough clearance for the out runner with the 20t pinion, so i stuck with the 25 for my number crunching.

Ok, intelligent guess says that the internal ratio is 33/18, or 1.83:1. All guesses referenced from the new emaxx parts list on the traxxas website, hope it is correct.

This appears to be slightly lower than the old emaxx second gear. That coupled with the use of 14 cells would account for the higher speed while still using the same diff ratio, tire height and motor kv.

Traxxas is smart, they reused the idler gear, still 20t but steel now. Good cheap way to up grade an old emaxx tranny!

Motor kv on the titans must be arround 2200, yeilding 35mph on 14 cells. This sounds too high, as most belive the motors to run around 20k rpm on 14.4, which would be 1400kv or so. Heres the speed calc for the stock setup, my best guess on motor kv:

Differential Ratio: 2.8461538461538462
Transmission Ratio: 1.83
Other Ratio: 1
Spur Tooth Count: 68
Pinion Tooth Count: 19
Total Voltage: 16.8
Motor KV: 2200
Tire Diameter (inches): 5.75
Spur/Pinion Ratio: 3.58 : 1
Total Ratio: 18.64081 : 1
Tire Circumference (inches): 18.06 inches (458.83mm)
Total Motor Speed: 36960 RPM
Vehicle Speed: 33.92 MPH (54.48km/h)

Now here is your proposed setup with the 25t pinion:

Differential Ratio: 2.8461538461538462
Transmission Ratio: 1.83
Other Ratio: 1
Spur Tooth Count: 40
Pinion Tooth Count: 25
Total Voltage: 14.8
Motor KV: 900
Tire Diameter (inches): 5.75
Spur/Pinion Ratio: 1.6 : 1
Total Ratio: 8.33354 : 1
Tire Circumference (inches): 18.06 inches (458.83mm)
Total Motor Speed: 13320 RPM
Vehicle Speed: 27.34 MPH (43.92km/h)

Looks to be a bit slow on 4s with that combo, but most likely not too far from stock. Would be better on 6s, at least for me.

Give it a try Sike, and let me know what you think. My math may be wrong, but I checked it a few times?!

[sikeston34m]

If the Mesh will line up right, we could use a 36 tooth spur instead.

The would give a 1.44 ratio instead of a 1.6

This outrunner will make about 900 watts, so I'm thinking the acceleration should be there.

Another option would be to go with the 2826/8 motor. It's a higher kv at 1130kv.

The mod 1 gears are alot tougher than the 32 pitch gears aren't they?