TC4 11.25:1 final Drive Ratio and Mamba 7700, to hot.
09-21-2007, 04:04 PM
#26
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RE: TC4 11.25:1 final Drive Ratio and Mamba 7700, to hot.
ORIGINAL: cheech4
mamba 6900 cannot be run with a 3S LIPO, sorry
mamba 6900 cannot be run with a 3S LIPO, sorry
Remember, theoretically you can not because when you do the math, you exceed the RPM SAFE LIMIT. However, when you factor gear ratio, wind resistance, drag, weight, etc, etc, you will find that you do not reach those numbers and it is possible to stay within the RPM SAFE LIMIT.
A prime example is actually advertised directly by Castle. The next time you see in the mags the ad of Castle showing Jim Schauer's 1/10 Top Fuel electric dragster that did 104mph in 132 feet, know that he used a Mamba Max 7700 with a 4S lipo.
Now, in LICO's case, that would not work as he is running the car over a great distance which would allow the motor to rev beyond the RPM SAFE LIMIT and cause plenty of damage. But this is to show that it is possible provided you have the adequate knowledge to set it up SAFELY!!!
09-21-2007, 06:41 PM
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RE: TC4 11.25:1 final Drive Ratio and Mamba 7700, to hot.
Ok Speedracer, I will look for your address online.
I probably will go to your shop tomorrow on the afternoon.
Thank you,
Lico
I probably will go to your shop tomorrow on the afternoon.
Thank you,
Lico
09-22-2007, 12:53 AM
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RE: TC4 11.25:1 final Drive Ratio and Mamba 7700, to hot.
i have a 7700 setup on my tc3 geared 17/72 and the temps dont go beyond 150 degrees on my motor and 130 degrees on my esc.
note: i also have a fan on my esc and a fan on my motor. i also installed the optional fan ducting kit....
note: i also have a fan on my esc and a fan on my motor. i also installed the optional fan ducting kit....
09-22-2007, 02:30 PM
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RE: TC4 11.25:1 final Drive Ratio and Mamba 7700, to hot.
SO, you have 4 fans? I just came back with my TC4 with new gears.
I am using now 18/75, the temps. got lower, 150 Esc. (with fan) 165 motor (7700MM).
How do you like the optional ducted fans? Do they help?
What is yor final speed? I haven’t timed my car yet.
Since I was able to bring the temps down, we have to agree with Access
about biger pinion helping to bring temps down, I had to much RPM…
Thanks Access for the help.
I am using now 18/75, the temps. got lower, 150 Esc. (with fan) 165 motor (7700MM).
How do you like the optional ducted fans? Do they help?
What is yor final speed? I haven’t timed my car yet.
Since I was able to bring the temps down, we have to agree with Access
about biger pinion helping to bring temps down, I had to much RPM…
Thanks Access for the help.
09-22-2007, 09:09 PM
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RE: TC4 11.25:1 final Drive Ratio and Mamba 7700, to hot.
i only have 1 fan on my motor and 1 on my esc. i clocked my 17/72 setup with my bushnell radar gun at 50mph with a 7cell 3500 pack. here are some pics.. i like the ducted fans. helps a lot with heat
