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Old 02-18-2006, 01:48 PM   #1
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Default Do you think GTB 4.5 will be too fast for offroad?

I ordered the GTB 4.5 motor but i was wondering if anyone thinks this will be just too fast for offroad? I run a xxxt MF2. The 5.5 is super fast and they say that the 4.5 is for touring cars. so what do you guys think?...
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Old 02-18-2006, 02:06 PM   #2
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If you were good on your throttle and were running a 4wd, try it out. Since you're running a truck, I wouldn't. I'd even consider the 6.5 for that. The world champion motors for offroad are typically 11-14 turns.
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Old 02-18-2006, 02:07 PM   #3
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Why not use it in the truck?
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Old 02-18-2006, 02:31 PM   #4
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You can never be too fast
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Old 02-18-2006, 05:25 PM   #5
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I race a high grip surface and the guys who have 5.5's in their Stadium trucks turn down their throttle endpoints. I run a 6.5 and it's plenty for trucks, borderline too much for 2wd buggy (I turn the expo down 20% and throttle endpoint down 10%)
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Old 02-18-2006, 05:40 PM   #6
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doesnt adjusting the EPA only limit the top speed? You still have MASSIVE torque you just dont go as fast right?
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Old 02-18-2006, 06:15 PM   #7
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Yes and no. If you limit the EPA because you couldn't control the power than you won't miss any of the torque since it was getting you in trouble in the first place. When you limit EPA you are clipping the peak voltage that you send to the motor and that limits power all across the range.
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Old 02-18-2006, 09:17 PM   #8
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I would definetly say the 4.5 equivlant to 6 or 7 single would be way to much for truck. Probably even too much for 4 wheel drive. The 5.5 equivlant to a 9 or 10 single would also be too much. But great for 4 wheel drive. The 6.5 equivlant to around an 11 or 12 would be plenty of power with extra power in reserve.

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Old 02-19-2006, 01:46 AM   #9
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I would have to agree with Crash. We had 2 guys today at my local track try out the 5.5. one was running a bk2 on offroad. we run pink slicks so the bite is very very good. anyways it was out of control fast pull the trigger and flip over backwards. On the oval with the same dirt a friend of mine put one in his sprint car and it was even to much for that. I usually run quite a bit of motor but I will say i was pretty impressed with brushless systems I have yet to own one myself but from 1/10th scale down to the mini's those things seem to be getting better and better
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Old 02-19-2006, 09:12 AM   #10
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the 4.5 is definitly overkill in offroad, whether it's truck or buggy or even 4wd, speed is not the key, clean, consistent driving is the best way to go faster.
Remember slow is fast.
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Old 02-19-2006, 10:30 AM   #11
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You can never have too much power. If you are afraid to get out of control with too much torque off the line then don't give it gobs of trigger. Those escs are very very smooth if you are smooth it will be smooth and fast. As far as popping wheelies goes, that just means their slipper was too tight. You want the slipper set so that it slips right before your car starts to wheelie so you can keep it straight. Any good mod will flip a car, I mean. Take a look at off road nitro. An os cv-r still creates gobbs more power then a 4.5 does.
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Old 02-20-2006, 10:21 AM   #12
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Hi,
Yesterday i ordered a GTB 6.5 for my losi XXX BK2. What gear ratio should i use ? Can the 78th spur gear still be use ?
Thanks
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Old 02-20-2006, 10:24 AM   #13
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your gonna get a gear ratio recomendation chart. Make sure you follow it in the beginning because "if" anything were to go wrong you want your warranty to hold up. Novak has the ABSOLUTE BEST customer service i have ever experienced. Buy a temperature guage and monitor the temperature of your GTB for the first couple of runs to make sure it isnt overheating at the gear ratio you have set.
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Old 02-23-2006, 12:46 PM   #14
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Default About gear ratio selection

I received my GTB 6.5. I read the notice and i have a question about gear ratio selection.
First it is written to start with a final gear ratio in this range 10.5 and 11.0 (for velociti 6.5 on off-road buggies). And next in the chart it is written for a XXX-BK2, using a 82T spur gear, to start with a 17T or 18T pinion gear. After calculate final ratio, it is 11.66 or 12.35 !

See the notice :


What starting ratio should i use ?
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Old 02-23-2006, 12:50 PM   #15
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well i have one in my ST truck and i love it,, i have the 5.5 i couldnt imagine going faster.. but it would be nice if it were on a large open track
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