Possible to change gear ratio in a losi 8ight truggy?
 

I have a Neu 1515 1.5d and I've found myself in a pickle.. this motor is way too much with the given gearing options in my soon to be built 8ight-t electric (tekno v3 based). Anyway the motor is perfect on 4s lipo, but being 2700kv rated it puts the truggy at over 59mph at it's slowest. I can't find any smaller gears for this setup... so I was wondering if there is a way to change the overall gear ratio to help here or does anyone know where I can find a 10t clutch bell for the e-clutch.

Thanks

Actually when calculating it out I would need a 9t or 10t clutch bell, do all mod1 clutch bells work on the tekno v3 electri-clutch?

anyone want to trade a Neu 1515 2d or 2.5d for my Neu 1515 1.5d? It actually just got back from Neu and was a full rebuild so it's like new on the inside, new bearings and all. :)

You can run the 1.5D on the Tekno, I think your estimated top speed is a little high.
Differential Ratio: 4.3
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 48
Pinion Tooth Count: 13
Total Voltage: 14.8
Motor KV: 2700
Tire Diameter (inches): 5.8
Tire Ballooning (inches): .2
Motor Current Draw: 0
Motor coil Ω: 0.004
Spur/Pinion Ratio: 3.69 : 1
Total Ratio: 15.87692 : 1
Tire Circumference (inches): 19.48 inches (494.74 mm)
Total Motor Speed: 39960 RPM
Vehicle Speed: 46.42 mph (74.57 km/h)
Estimated Adjusted Speed: 44 mph (70 km/h) - 6% loss
Effective KV Value: 2700
KT constant: 0.5 oz-in/A
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified...
Final Power: Amperage not specified...

That's what I got when I put it in the calculator. Also, you can get the 50T spur gear that Losi makes, that will also lower the top speed a bit.

But if you are looking to get a different motor to run on 4s don't get the 2.5D, that will be too slow. The 1Y or the 2D will work better, but you'll prolly have to go to a 14t bell with the 2D.

Also, only Revo type bells work with the Tekno kit.

Yeah, going with a 50T spur and a 12T pinion would bring the speed down to a more reasonable 40ish mph. Not sure if 12T is an available tooth count for the clutch setup, but, you can always use an actual pinion instead.

Also, a little bit smaller tires can make a difference.

hmm I was using the wrong ratio on the diff's I was using the calculators stock 1/8 numbers... that makes it much much better :)

Stum,

My LOSI running the following:

18/44
5S FP 5000mah
Mega 22/30/1 3500kv

All day long, 57mph max on radar. You will not hit 50's with your planned setup. You should be fine!!

I beg to differ with that statement! A 1515 2.5d actually gears up pretty nice on 4s. Running one on my E-REVO with 25t pinion and any spur from 54-68. I would say to ditch the electric clutch deal, get a RCM mount and use a 5mm MOD1 pinion.

I run the 2.5d in my erevo racer as well.. it's very nice. I do beg to differ though there is no way you can fit that 25t pinion and 68t spur :P I had to cut out a ton of material just to make a 26t/58t fit no way no how any larger spur would fit on there w/ the 26t. W/O cutting away 58t is prob the biggest you can fit w/ the 25t pinion, if you removed some material you may squeeze the 62t on but I really doubt it. With a 25t pinion on the erevo you true options are 54, 56, 58. I will say pushing it with these larger pinions does keep the temps pretty high, I would love to run a 5s config but it would throw off the weight and it's just not worth the $$$'s for the lipo's. You can get great 2s 30c packs for just over $100 now (polyquest etc) hard shell and all. Expect reduced prices as makers such as Losi dump their offerings to the masses as well.

Back on the 8ight-e Truggy... the electri-clutch is awesome and really gives you some nice control on the track, if you bash the pinion direct drive is great but if you race the clutch is sweet. I already have the electri-clutch in my 8ight-e buggy and I've run it both nitro and direct.. again the clutch is best.

Id take the pinion over going back to nitro though ;P LOL

To each their own but I tried the elektriclutch as well and direct drive is much better. The clutch acts somewhat like a slipper and reduce the current draw from your motor but eliminates most of the other advantages of an electric system (brakes & instant power). I'm also not really a fan of metal to metal pinion and spur. Metal to metal is fine in a sealed static transmission but not good where chassis flex is involved.

You'd be served well using between a 16-18T pinion and 51T spur.

I sold my 8ight-e a while ago but I still have an aluminum spur adapter for the 8ight that fits the ofna 51t plastic spur.

PM me if your interested.

Power is still pretty instant with the clutch, it just takes slight edge off when you take off and lets you have better traction, effectively making you faster which is exactly why it works so well on dirt race tracks. Again at times slower is faster.. expecially racing. If I were on carpet or asphalt I would go w/ the pinion to drive. PS this system is using mechanical brakes.. Which is a ton better than motor braking, not only for the motor and esc but it allows much better adjustment including front to rear.

Stum the racing bug did'nt just bite you it ripped a chunk out of your ass." Again at times slower is faster.. expecially racing" :gasp: From the guy that once wanted to go as fast as possible.

You can say that again... to the point I don't even bash anymore :P