b44 gearing with 6.5
01-07-2010, 09:46 PM
#4
01-08-2010, 12:29 AM
#6
OCRC = 84/21 with a 6.5. I wouldn't run more than 10 minutes at a time with that gearing, but it's great for racing. Always keep an eye on those temps 
01-08-2010, 01:08 AM
#7
I run at OCRC and WCRC. I mainly bash, I don't race anymore... I have a 5700Kv Castle in mine, which is closer to a 9 to 10T motor. I honestly don't know how people are getting away with such tall gearing like 84/21, but I guess you have to remember that not all 6.5T motors are created equal. Some have more torque, some have more top-end RPM.
I would definitely stay on the safe side. If you're planning to race, I would time it for a 6 minute run (I think qualifier and mains are 5 minutes), but a 6 minute run would give you a good leeway in case you pull the trigger harder during one of the runs.
If you bash, then you might lose track of time, better to gear it low to keep the temp down...
It's a trial and error. Even if you have the same setup, same motor, same battery, same car, same gearing, both motors will come off at a different temp.
Of course you can do things like cut the front part of the body, primarily on the right side to let air in and cut the rear part along that same side to let air out. This will significantly reduce your temp but you will have a dirtier car as the front tires will kick the dirt up and into the chassis...
If you're good on checking your spur/pinion gear for debris and shoot your chassis with an air gun every run, then you should be ok with the dirt...
I would definitely start with a 84/16 and work your way up. I have no idea what motor someone is using to get a good running temp with a 84/21 with a 6.5T motor...
I would definitely stay on the safe side. If you're planning to race, I would time it for a 6 minute run (I think qualifier and mains are 5 minutes), but a 6 minute run would give you a good leeway in case you pull the trigger harder during one of the runs.
If you bash, then you might lose track of time, better to gear it low to keep the temp down...
It's a trial and error. Even if you have the same setup, same motor, same battery, same car, same gearing, both motors will come off at a different temp.
Of course you can do things like cut the front part of the body, primarily on the right side to let air in and cut the rear part along that same side to let air out. This will significantly reduce your temp but you will have a dirtier car as the front tires will kick the dirt up and into the chassis...
If you're good on checking your spur/pinion gear for debris and shoot your chassis with an air gun every run, then you should be ok with the dirt...
I would definitely start with a 84/16 and work your way up. I have no idea what motor someone is using to get a good running temp with a 84/21 with a 6.5T motor...
01-08-2010, 04:40 AM
#10
Tech Regular
Nevertheless, I totally agree you start geared low, then work your way up in gearing while checking the temps... It's the only safe way to do it!
01-08-2010, 06:21 AM
#11
Okay lets really twist this thread. Strictly speaking mod open motor racing. I gear for temps. 110 to 130 is the range I gear for. If I need more motor speed I throw in a faster motor and gear to these temps.
Now that said the chart in the link above says to run 23/84 with a X12 6.5 B44 I am currently running 130 with an 8.5 Novak LRP TC, I'm geared 22/84. And I should be 1 tooth lower to be at my perfect temp gearing to honest.
Now a 6.5 23/84 ??? The sponsored guys at our track are temping outrageous temps coming of the track. So my guess is this chart is touchy in gearing.
A fella at our track relativly small in size is running an X12 6.5 LRP TC and all is good. around 140 degrees.
16/15 is a good start for sure.
Now that said the chart in the link above says to run 23/84 with a X12 6.5 B44 I am currently running 130 with an 8.5 Novak LRP TC, I'm geared 22/84. And I should be 1 tooth lower to be at my perfect temp gearing to honest.
Now a 6.5 23/84 ??? The sponsored guys at our track are temping outrageous temps coming of the track. So my guess is this chart is touchy in gearing.
A fella at our track relativly small in size is running an X12 6.5 LRP TC and all is good. around 140 degrees.
16/15 is a good start for sure.
01-09-2010, 12:37 AM
#12
Tech Master
Maybe the sposored guys can run outrageous temps because they are sponsored and so just get more gear given to them?????
Heat will ALWAYS affect magnets, it's straight fact.
The real key is to make sure that gearing up and increasing temps is also increasing your speed on the track. Going faster on a straight isn't always getting you around the track in a lower time if you can handle the car.....
Heat will ALWAYS affect magnets, it's straight fact.
The real key is to make sure that gearing up and increasing temps is also increasing your speed on the track. Going faster on a straight isn't always getting you around the track in a lower time if you can handle the car.....
01-10-2010, 08:39 AM
#14
I've seen a 78 and 19 and that car was in the a-main, it was a b44 too.