Crt ?

[rchippie]

To anyone that has a crt not the mini but the full size crt. I'm trying to use brian's calulator but i need to know the diff ratio for the FR & RR diffs . Thank's

Originally Posted by rchippie

To anyone that has a crt not the mini but the full size crt. I'm trying to use brian's calulator but i need to know the diff ratio for the FR & RR diffs . Thank's

IIRC it's 3.31:1

Bye:018:

[Serum]

Yeah, the stock crt uses 43/13 diffs.

[rchippie]

Originally Posted by Serum

Yeah, the stock crt uses 43/13 diffs.

Thank's guys. What size spur are people running in the CRT ?. I would like to use mike's CRT truggy mount .

Originally Posted by rchippie

Thank's guys. What size spur are people running in the CRT ?. I would like to use mike's CRT truggy mount .

Well, you could look at is this way:

Situation #1

Stock 3.31:1 diffs + stock steel 62 spur + 14-16 pinion= worn out pinions every other run.:035:

Situation #2

HB LSP r&p 4.3:1 diffs + kyosho plastic 46 spur + 14-16 pinion= happy pinions:018:

Hope this helps!

Bye:027:

[rchippie]

Originally Posted by cemetery gates

Well, you could look at is this way:

Situation #1

Stock 3.31:1 diffs + stock steel 62 spur + 14-16 pinion= worn out pinions every other run.:035:

Situation #2

HB LSP r&p 4.3:1 diffs + kyosho plastic 46 spur + 14-16 pinion= happy pinions:018:

Hope this helps!

Bye:027:

Im definetly not gonna buy new diffs . The CRT im getting sunday is brand new & unused. What about the ofna 51t spur ?.

This is what i got using the ofna 51t spur & stock diffs.



post:

Differential Ratio: 3.3076923076923075
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 51
Pinion Tooth Count: 12
Total Voltage: 14.8
Motor KV: 1853
Tire Diameter (inches): 5.5
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0.0092
Spur/Pinion Ratio: 4.25 : 1
Total Ratio: 14.05769 : 1
Tire Circumference (inches): 17.28 inches (438.88mm)
Total Motor Speed: 27424.4 RPM
Vehicle Speed: 31.92 MPH (51.28km/h)
Effective Speed Rate: 2.16mph/V (3.46kmh/V)
Effective KV Value: 1853

[BrianG]

Originally Posted by cemetery gates

Situation #1

Stock 3.31:1 diffs + stock steel 62 spur + 14-16 pinion= worn out pinions every other run.:035:

Not necessarily. The key to long-lasting pinion is a solid and consistent mesh. Both Mike and I (and maybe others) have run steel on steel with very good results. I've run my Hyper8 for about 10-12 packs' worth and the pinion still looks very good. The only downside to steel pinions is the cost compared to regular pinions.

Originally Posted by BrianG

Not necessarily. The key to long-lasting pinion is a solid and consistent mesh. Both Mike and I (and maybe others) have run steel on steel with very good results. I've run my Hyper8 for about 10-12 packs' worth and the pinion still looks very good. The only downside to steel pinions is the cost compared to regular pinions.

Yes, I know that, but not everyone has got the money for hardened steel pinions and can achieve an absolutely perfect and consistent mesh.

@rchippie
- you would only need the ring and pinion gears, not complete diffs....

Bye:018:

*EDIT* Brian, actually when I had a dual HV-maxx e-maxx I ran a RRP 65t hardened steel spur with kyosho pinions and had no ill effects at all over many, many runs. But, when I put RRP pinions on (just to change ratio) the pinions lasted maybe 3 runs at most. Weird:confused:

[rchippie]

Originally Posted by cemetery gates

Yes, I know that, but not everyone has got the money for hardened steel pinions and can achieve an absolutely perfect and consistent mesh.

@rchippie
- you would only need the ring and pinion gears, not complete diffs....

Bye:018:

*EDIT* Brian, actually when I had a dual HV-maxx e-maxx I ran a RRP 65t hardened steel spur with kyosho pinions and had no ill effects at all over many, many runs. But, when I put RRP pinions on (just to change ratio) the pinions lasted maybe 3 runs at most. Weird:confused:

here are the results with a 60 amp load using a 51t 12 gearing.
Differential Ratio: 3.3076923076923075
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 51
Pinion Tooth Count: 12
Total Voltage: 14.8
Motor KV: 1853
Tire Diameter (inches): 5.5
Tire Ballooning (inches): 0
Motor Current Draw: 60
Motor coil Ω: 0.0092
Spur/Pinion Ratio: 4.25 : 1
Total Ratio: 14.05769 : 1
Tire Circumference (inches): 17.28 inches (438.88mm)
Total Motor Speed: 26401.54 RPM
Vehicle Speed: 30.73 MPH (49.36km/h)
Effective Speed Rate: 2.08mph/V (3.34kmh/V)
Effective KV Value: 1783.89

[BrianG]

Originally Posted by cemetery gates

*EDIT* Brian, actually when I had a dual HV-maxx e-maxx I ran a RRP 65t hardened steel spur with kyosho pinions and had no ill effects at all over many, many runs. But, when I put RRP pinions on (just to change ratio) the pinions lasted maybe 3 runs at most. Weird:confused:

Were the pinion teeth shaped the same? Remember, some have different pressure angles, which can make a HUGE difference in pinion longevity.

Originally Posted by BrianG

Were the pinion teeth shaped the same? Remember, some have different pressure angles, which can make a HUGE difference in pinion longevity.

Yup, shaped the same, standard 32p. Maybe the RRP pinions were aluminum and not steel? IIRC, I thought they were steel, I think traxxas ones are at least...

Bye:018:

[rchippie]

After talking with mike & brian this is what im going with. The motor is a 9XL

post:

Differential Ratio: 3.3076923076923075
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 62
Pinion Tooth Count: 16
Total Voltage: 14.8
Motor KV: 1853
Tire Diameter (inches): 5.5
Tire Ballooning (inches): 0
Motor Current Draw: 60
Motor coil Ω: 0.0092
Spur/Pinion Ratio: 3.88 : 1
Total Ratio: 12.81731 : 1
Tire Circumference (inches): 17.28 inches (438.88mm)
Total Motor Speed: 26401.54 RPM
Vehicle Speed: 33.7 MPH (54.14km/h)
Effective Speed Rate: 2.28mph/V (3.66kmh/V)
Effective KV Value: 1783.89

[BrianG]

Actually, I told hippie he needs to send me his truck, but he didn't like that idea. :)

[rchippie]

Originally Posted by BrianG

Actually, I told hippie he needs to send me his truck, but he didn't like that idea. :)

Dont be made :005: . Brian what do you think of my last post about yor calculator ?.

[BrianG]

Sounds good to me - nothing looks bad. I just want to see it finished; that's the true test. :)

A little off-topic, but have you figured out your buggy delimna, or are you going to scrap it to do the truggy?