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Old 10-26-2007, 04:16 PM   #16
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this is a 2 cell 20c:http://www.e-rc.co.uk/shop/evo-1800mah-2s1p-p-60.html

not too far over what I have flightpower evo lite(2100 2cell 18c $41.99US)
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Old 10-27-2007, 08:51 AM   #17
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Originally Posted by Nuno Gancho View Post
Hello, we here also race with mabuchi for endurance, what is the final ratio that you use for lipos? Thanks.
I run 4.30-4.50:1 It's a fairly large and sweeping track.
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Old 10-27-2007, 09:56 AM   #18
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yeah i want to use 3 cell for my rally because its slow otherwise. but the 2 cell one would be good for 1/10.
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Old 10-27-2007, 10:00 AM   #19
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This car is amazing, I look foward to racing with it today
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Old 10-27-2007, 10:00 AM   #20
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This car is amazing, I look foward to racing with it today
lucky bugger...
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Old 10-27-2007, 10:23 PM   #21
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It finished second in the mod sedan a main "very close racing" today and I got third so yes it kicked my A$$ again
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Old 10-30-2007, 06:02 PM   #22
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This is a project with the goal of taking down big prey like modified sedans with the equipment thatís least expected. I hope this thread will show that low budget, low weight, and a high degree of finishing skill can take the place of high dollar, high powered cars in a race environment. Some liberties will taken, when it suits me; at my home track we donít weigh and we allow LiPo; check with youíre local club before trying some of this.

This is already a successful formula for me, because I have out-qualified (at least for one heat) a good driver that was using LiPo and the new Tekin R1/Redline combo. The great part about that was that it was only the first step, on the first carpet race of the season (for me), and it only gets better.

Initially I started with:
Xray T2R
Dynamite Tazer 12T esc
GreatPlanes Electrifly 3200 2 cell LiPo
Futaba s9550 servo
Spektrum micro rx
Mabuchi motor
foam tires
DNA body

If youíre counting, thatís a $40 ESC, an $11 motor and $80 battery. Later that battery was exchanged for a $42 battery. No $200-$300 investment in brushless/brushed gear, $200-$300 in batteries and their gear and lots of saved time too.

This combo came in at 1186 grams, which is very, very light. I have a goal to get the car under 1000g so as to have an unfair advantage in terms of power to weight and handling.

The next step was to take out the GreatPlanes LiPo because at 190g, it was just a pig. For comparison, a normal 3800-4200 NiMH pack is 360-400g+. The new pack that has shown itself to be a winner is the FlightPower EVO LITE 2100mah 2 cell LiPo. It only weighs 106g and is a little longer than a NiMH 4 cell pack and much narrower. For some perspective, this would be a good pack for an Associated RC18T/B/R car, and never considered for 10th scale. This about getting crazy light though and the low draw of the Mabuchi will make this work.

Balancing this took very little work, and going along with the light theme, no chassis weights are used. The AMB transponder and Spektrum rx are tucked up next to the steering rack on the right side of the chassis opposite the servo. The Dynamite ESC is right behind those, followed by the LiPo sitting over the back four battery slots. Only the Mabuchi and the servo live on the left side of the chassis. When the car is on the tweak station it takes very little weight jacking with the springs to level it out.

Also changed was the Mabuchi motor. Earlier in the year, I got the club to purchase 20 Duratrax 540 motors very similar to Mabuchiís. It looks just like a Mabuchi except for fan blades attached to the top of the stack to cool it. The hope was to make this a handout motor for Novice and maybe even stock class type racers. This did not work out though because the motors do not fit without modification in JRXS and TC4 cars that currently make up most of those entries. Anyway, after testing on the cheeseball dyno, I guessed that this motor was actually faster than the Mabuchi

In the second week of racing I chose to maximize track time, and race in stock/rubber and modified/foam. To make this work with a short race schedule the rubber tire setup stayed on the car the entire time. This combo was top qualifier by 3 laps in stock, and 3rd qualifier in modified by 1.5 laps. No follow through though, because I left early for a previous engagement. The Duratrax motor was fast, fast, fast, only the guy with the Xray T2/fresh 4200ís/LRP ESC/4.5 motor was much faster.

Next week I will race modified/foam only class to take advantage of the foam tires. The rubbers weigh in at 122g while the foams are 69g. Thatís over 50g of rotating, unsprung mass, and the car will be much faster for it. Also, Iím going to take Protoform lightweight Status carpet body and paint it with a very thin coat of paint to try to eke out some more grams.

Please feel free to ask me about it, and tell me what you think.
Gary

Absolutely AWESOME....I'm making plans for the same too, but using the t2'07....hopefully the weight will be similar.

Thanks for the great initiative, very inspiring!

regards
Marcus
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Old 11-02-2007, 04:56 PM   #23
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Thanks shadow!

12L3 and T2R lipo/mabuchi pair!
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Xray T2R,  2100 mah 2c LiPo, and Mabuchi power: Tech tips and Tricks-modded-pair.jpg  
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Old 11-03-2007, 04:54 AM   #24
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gary,

What the final weight after the 'improvement' initiatives? <1000g?
What else have u done specifically?

Also, what size pinion have u tried?

regards
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Old 11-03-2007, 07:48 AM   #25
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about 1100 with body,
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Old 11-04-2007, 07:43 AM   #26
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Currently running 27/84.

No real new weight loss steps.

Race lap times vs a T2/lrp-4.5/fresh 4200's, he finished 1st I finished 2nd:
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Old 11-04-2007, 08:58 AM   #27
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Quote:
Originally Posted by gacjr0 View Post
Currently running 27/84.

No real new weight loss steps.

Race lap times vs a T2/lrp-4.5/fresh 4200's, he finished 1st I finished 2nd:

Was it because of my lucky pinion gear
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Old 11-04-2007, 06:04 PM   #28
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Awesome project and great results. I'll have to go dig up my notes, but I'm pretty sure that the Duratrax 540 motor with the fan (the one from the starter box) is actually a 20 turn with about 8 degrees of timing. Much faster than a Mabuchi/Johnson, which is a 27 turn with a little negative timing. The internal fan helps it run somewhat cooler and last longer.
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Old 11-04-2007, 07:59 PM   #29
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No wonder its faster that a mabuchi!

It's still slower than a stock motor though.
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Old 11-04-2007, 11:48 PM   #30
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Quote:
Originally Posted by gacjr0 View Post
Currently running 27/84.

No real new weight loss steps.

Race lap times vs a T2/lrp-4.5/fresh 4200's, he finished 1st I finished 2nd:
I can see why you finished so high, the other drivers were very inconsistent. It doesn't matter how much power you have, you won't be fast if your not consistent.
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