6S CRT.5 Neu motor question

[VintageMA]

Jeff - I'm using the MA 3S-5000mAh packs (about a year old now, but were strong when i first bought them).

I started out with the same motor as you B50 8L and was getting just about the same runtime as you. Then I got the 1930/6 and with the same gearing got a great speed boost and things were just in check (if maybe close to the edge).

With the RCM extended chassis and 30 series wheels it seems the current draw has gone straight through the roof.

I actually REALLY like your idea on re-configuring the LMT to a 1930/10 to lowe the KV - I hadn't even thought of that. I didn't want to have to ditch the LMT - I love their motors. Are you sure changing from a delta to a wye config will produce that end result?

[BrianG]

Originally Posted by VintageMA

...With the RCM extended chassis and 30 series wheels it seems the current draw has gone straight through the roof.

Well, the extended chassis added some weight, and the larger tires effectively increased your gearing, so that makes sense. I would've gone down at least 2 teeth on the pinion to keep close to the same roll-out ratio and to help compensate for the added weight. Of course, this assumes you don't mind losing a bit of top speed.

[VintageMA]

Originally Posted by BrianG

Well, the extended chassis added some weight, and the larger tires effectively increased your gearing, so that makes sense. I would've gone down at least 2 teeth on the pinion to keep close to the same roll-out ratio and to help compensate for the added weight. Of course, this assumes you don't mind losing a bit of top speed.

Unfortunately, when I put the larger wheels on, I did re-calculate for the larger diameter and went from 17/46 to 14/46. Still heavy current draw.

Running 3-10-1 for differential weight (even put in new oil when I broke it down and moved to the new chassis) to prevent too much unloading to the front wheels - wonder if that may be affecting things.

It's weighing in around 4.5lbs - is that consistent with you guys?

[jhautz]

I dont know the weight of mine, but Im sure yours is heavier. Im running stock chassis and tires with a smaller lipo.

I'll try and get a weight for you to comapre against tonight.

[VintageMA]

Jeff - that was an awesome idea with the reconfiguration of the LMT - thank you very much!!

A little tricky reconfiguring the solder joints but I got it done and made sure the solder was nice an thick to avoid creating a fuse as per your old thread from last summer.

Went back up to a 17/46 (~39mph) gearing and with 4S pack measured peaks around 30 Amps just boogying around the house (whereas I would hit high 40s with the previously described config).

I probably won't get out for a real run until the weekend, but I am very excited with a setup that may work great and save me ~$500+ in the long run.

The big bummer is that my order for a Neu 3900mAh 3S pack just came in - don't know what I am going to do with it now, but maybe hang onto it for some ~30mph running around - probably get some long runs with it now.

Once I get a full run and can check the amp peaks and am sure this setup will work I then ned to find a nice 4S pack that will balance out well with the vehicle. The motor (230g), servo (60g) plus heat sink and fan come out to ~300grams. I had gotten the Neu 3.9Ah 3S pack cause it weighs in at 306grams and almost balances out the motor side of the vehicle perfectly. Maybe a NEU3200XP 4S (337.5g) or a TP3300 eXtreme V2 4S (351g) - both rated 25C.

[lincpimp]

I am currently running a novah hv 6.5, with a MM on 3s lipo. I had a maxamps 4200 pack, and it puffed first run. Kind of disappointing, as I had a 15t pinion in it, and it was not that fast.

Having changed almost every vehicle over to 5s, and recently making a few 8s trucks, I can say that going back to 3s sucks. I would almost say that if you can, go to 5s lipo and an 1800kv-2000kv motor. Gear it for 45mph, and the performance will be great!

I have a LS10, which is almost identical size/weight to the .5 with the ext chassis and truck tires. I ran a hacker c50 14l on 3000 5s lipo thru a quark 65 and it was ridiculous.

I am sure just stepping up to the 4s and lower kv will make a huge difference. 3s just seems to run at the edge of what most appropriately sized batts can provide. I plan to run a 5000 neuenergy 3s 25c pack in my .5, but need to move some stuff around. Then I will gear up to a 17t pinion, as the 15t is a bit slow, but that may be my 2100 3s maxamps packs (2 wired in parallel) dropping voltage under load.

[jhautz]

Originally Posted by VintageMA

Jeff - that was an awesome idea with the reconfiguration of the LMT - thank you very much!!

A little tricky reconfiguring the solder joints but I got it done and made sure the solder was nice an thick to avoid creating a fuse as per your old thread from last summer.

Went back up to a 17/46 (~39mph) gearing and with 4S pack measured peaks around 30 Amps just boogying around the house (whereas I would hit high 40s with the previously described config).

I probably won't get out for a real run until the weekend, but I am very excited with a setup that may work great and save me ~$500+ in the long run.

The big bummer is that my order for a Neu 3900mAh 3S pack just came in - don't know what I am going to do with it now, but maybe hang onto it for some ~30mph running around - probably get some long runs with it now.

Once I get a full run and can check the amp peaks and am sure this setup will work I then ned to find a nice 4S pack that will balance out well with the vehicle. The motor (230g), servo (60g) plus heat sink and fan come out to ~300grams. I had gotten the Neu 3.9Ah 3S pack cause it weighs in at 306grams and almost balances out the motor side of the vehicle perfectly. Maybe a NEU3200XP 4S (337.5g) or a TP3300 eXtreme V2 4S (351g) - both rated 25C.

Cool. Hope it all works out well. Let us know.