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Old 12-01-2007, 02:35 AM   #1
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Default Pinion size for 7.5brushless on a b4...

whats a good pinion starting point on a b4 with a lrp 7.5, thanks in advance (indoor track, dirt, not clay)

Thanks in advance
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Old 12-01-2007, 06:38 AM   #2
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I'm running a 21 pinion with the stock spur on my B4 with an orion 7.5. I would start with a 18 and go up from there since the LRP doesnt use a sintered rotor.
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Old 12-01-2007, 06:56 AM   #3
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Going from novaks suggestions on gearing, it should have a FDR of 9.5 . Using their formula, and using stock spur, they suggest 22 pinion. What has worked for me is starting at the point they suggest and then go up and down from their testing different ones. But, I have found sometimes the formula is pretty close to what I actually go with.

good luck.
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Old 12-01-2007, 06:57 AM   #4
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Whoops, forgot to mention also, alot of racers at my track go by the rule, go up on the pinion until your motor gets hot. I dont' know how true it is, but, another suggestion.
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Old 12-01-2007, 10:52 AM   #5
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so the rotors in the vector motors arent sintered? on the back it says " New military spec neodymium magnet" i had problems with the neos' last year b/c they kept gettin warm on me, hope these are better...thanks for the replys
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Old 12-01-2007, 10:57 AM   #6
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so the rotors in the vector motors arent sintered? on the back it says " New military spec neodymium magnet" i had problems with the neos' last year b/c they kept gettin warm on me, hope these are better...thanks for the replys
No they are not sintered. I was running a 22 tooth on my RB5 with the 7.5 LRP motor with a sintered rotor and the same gearing with the 7.5 Novak Velocity.
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Old 12-01-2007, 11:04 AM   #7
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Ok, thanks for the info, i checked around and looks like u can buy a sintered rotor for em, though i only found it at stormerhobbies, and it looked like they were on order...part number is LRP 50610 is this a new item or do you know of a place online that stocks them? Thanks in advance!
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Old 12-01-2007, 11:23 AM   #8
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Ok, thanks for the info, i checked around and looks like u can buy a sintered rotor for em, though i only found it at stormerhobbies, and it looked like they were on order...part number is LRP 50610 is this a new item or do you know of a place online that stocks them? Thanks in advance!
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Old 12-01-2007, 01:42 PM   #9
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it all depends on how big or small ur track is really on the gearing. at my local track i run a b4 with the lrp 6.5 and gear it at 20, one of the pther guys run the 7.5 and he runs his at 21 or 22 depending on what track we built for that month. with mine geared at a 20 its just over room temp after a 6 min race.
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Old 12-01-2007, 01:45 PM   #10
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At the race I was at last weekend guys were running from a 19 to a 22/81 ratio with novak 7.5Rs.
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Old 12-01-2007, 01:55 PM   #11
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any of those would be good all around choices cuz your not starving for power by any meens.
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Old 12-01-2007, 02:06 PM   #12
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I've run 18/81 on a small high bite track... up to 21/81 on other tracks. I have the original Reedy 7.5... if you gear it on the high side you will lose a lot of hte drag brake. So if you drive with drag, and can't get enough.. gear down.
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Old 12-01-2007, 02:51 PM   #13
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thanks for all the info guys, really appreciated!

Mike
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Old 12-02-2007, 12:01 PM   #14
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one more reason you should ditch the LRP motor and get a Novak one.
And sell the buggy and get a truck like the rest of us.
BTW, happy b-day bro.

Nate
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Old 12-02-2007, 01:07 PM   #15
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I dont think ill ditch the motor, ill give it a try, and i hate trucks, u know this thx for the happy bday!

Mike
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