New hi-speed project

[aqwut]

Do 12S Brian... . go go go.... 12S1P 6000mAH 25C would be just Wicked...

[lutach]

Kong Power and Air Thunder are somewhat cheap compared to TP and FT. You can even use the small capacity packs and I can assure you they will deliver 120A spikes when needed. I have proof .

[BrianG]

lol, 12s is a bit much. I test-fitted two of my 14-cell NiMH packs for weight/size, and it's a bit unbalanced. And I would need to dial in tons of shock preload. 28 NiMH cells is roughly the same weight as a 12s/5Ah pack weight-wise. Besides, that would be spinning my 1515 Neu to over 73k rpm!

As far as lipo price, I would need 10s @ ~5Ah, which would be ~$600. But I have ideas to keep it well under $600.

[lutach]

Originally Posted by BrianG

lol, 12s is a bit much. I test-fitted two of my 14-cell NiMH packs for weight/size, and it's a bit unbalanced. And I would need to dial in tons of shock preload. 28 NiMH cells is roughly the same weight as a 12s/5Ah pack weight-wise. Besides, that would be spinning my 1515 Neu to over 73k rpm!

As far as lipo price, I would need 10s @ ~5Ah, which would be ~$600. But I have ideas to keep it well under $600.

Brian, I totally forgot about the motor you're using. My fault. If you are really going to try and make it to 100mph and if you ever do get 12S lipos, I'll be more than happy to lend you my 1521/1.5Y, but you must return it as soon as you are done .

[Arct1k]

How about moving the brake servo to the other side?

[BrianG]

Yes, that would work, but still have the issue about the weight and over-revving of the motor. Besides, I don't wanna make yet another servo tray.

[BrianG]

I'll keep that in mind... IF I ever get this done and IF the car survives the first few runs.

But, you really must more clearly define "you must return it as soon as you are done", because "when I'm done" could be a very, very, very long time.

[lutach]

Originally Posted by BrianG

I'll keep that in mind... IF I ever get this done and IF the car survives the first few runs.

But, you really must more clearly define "you must return it as soon as you are done", because "when I'm done" could be a very, very, very long time.

I meant to say when you are done with the speed runs . You will survive the first few runs for sure. Those 1/8 scale cars are tough.

[jzemaxx]

Looks awesome. What rpm are you shooting for to turn the motor?? What KV is that 1515?

[BrianG]

Thanks!

Kv=1700. Running 10s, rpms are ~62k, but the amp draw will lower the kv and the drag won't let the motor spin that fast, so I am thinking it will actually only be going ~57k.

[jzemaxx]

That will be plenty of RPM's then.

[BrianG]

Does anyone use a Spektrum DX3/3.0 and HV-110 in your setup?

I'm curious how to set up the controller and radio so they work together; things like EPA, trim, etc. I got CH3 mixing for the rbake working on my setup, but the ESC does not want to arm. I have the ESC set to auto-range on startup, but no-go. I can also get into programming via the radio (just to test the radio), but cannot change settings. So, I assume the ESC is not seeing the low throttle point. I'm trying to think of how an air radio would work and emulate that, but that's obviously not working.

I currently have the forward EPA set to 125%, and the reverse EPA set to 0. Trim is at the default 0. TBH, I didn't spend too much time trying this, but wanted to get a test run with 28 Ni cells just to see.

[jzemaxx]

I have the 2.0 which is the same.....I had to use the pix stix convertor. Works like a champ after that.

[BrianG]

Hmm, I know there are those who did not need the Pistix. I might just call Castle and see what they say if I don't see any responses here in the next hour or so...

[jzemaxx]

I know it made it a snap to program.