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GTHound - you can start taking voltage measurements at various parts of the battery during a run and comparing it with what the ESC is seeing. Like 88fiero says, you may have a bad connection somewhere. Even if you're only using 8 gauge wires (for example), at 18 inches long, you'd still see...

Hi Mateen - I was looking at your datalog and was puzzled, until I re-read your post. 3 car batteries - I assume lead/acid - well, that answers that question, lol. Thanks for posting that data.

I think you're pretty much spot on with everything. Running more cells than necessary has two advantages and two primary disadvantages. The advantages are that you can compensate for voltage drop. The other advantage is you don't have to charge them all the way - if you look at a typical...

There are two main issues - both related. The brushless controllers you're referring to typically can't handle the sort of eRPM we're looking for. There are a few controllers with ultra-high eRPM options (Kelley is one, but I'm not sure how you'd buy one); and that adds substantially to the...

Golf cart stuff is too heavy, big, slow and inefficient. You probably could get something to work but it would be huge and heavy, and still be less powerful than the smaller stuff (and probably more expensive).

You are literally right in the sweet spot for the P2 hobbywing Castle setup. It will make somewhere between 350 and 400 horsepower on your engine and probably more torque than your engine could handle. Of course you could dial it back:

Here's the video - it's worth noting that to run these times, the car made over 800 crank horsepower: On a mineshaft air day, it might get to 850 hp. But I think that's all the compressor's got. Without another power adder (i.e. second electric supercharger or nitrous) it won't hit 1,000...

Sorry about taking so long to respond. They poured my foundation incorrectly in Texas, and dealing with that from over 1,600 miles away is extremely difficult and frustrating; I'm also packing up stuff from my house for my next trip down. I can't wait until all this other stuff is in the...

LMT 30100 and yes. Haven't pulled the ESC logs yet though.

I'm really eager to see how those cells work out - please keep us posted. My own experience tells me that until you put the compressor on the engine, you won't know how fast the motor will actually turn - not one motor I've tried has been able to hit it's rated kv in actual use, though some...

No - it's a hex drive. It's actually a billet Si wheel in the Sledgehammer - not much of a difference, but a difference none the less.

Thanks for taking the time to model all that. I spent Thursday prepping the car and Friday I took it to the track. Of course, there'll be a video, but here's quickest slip (fastest was 136 mph):

That sounds closer. Those programs always seem to get you in the ballpark, but they're only as good as the input data. I know when I'm in the building phase of a project I can't help but do whatever simulations I can because I'm excited to see the result. I appreciate you running that through...

The valve sizes are close - 2.02 and 1.60. The seat to seat duration (0.006") is more like 280 and 292. The engine makes about 520 flywheel hp - with the other converter I saw a 26% loss through the trans and converter; and it has a BSFC of about .47, which is actually not great because of the...

Sorry for the delay - I've been having major issues with the place in Texas - the contractors poured the foundation incorrectly (and it passed 3 inspections before it was poured, somehow). It's been all I can do to work, try to fix that, keep tabs on my mom (she's 81 now) and kid, pack up the...

Here's the video:

Low rpm boost will blow up pistons. I have a collection of pistons to prove it, and have even cracked a block (SBF) down the middle as a result. What will happen is your tuning window gets real small, because your cylinder pressure gets really high. RPM is easier on parts (up to a point, of...

I would say 12s should be a minimum requirement for any ESC one would consider for any full-size automotive application. Also, while kv and torque constants can be used as a guide, I wouldn't go by them. Too many variables. In practice you'll find things change. Sometimes by a lot. That's...

I think you could come close to 17kW from the Castle/Hobbywing setup. I'm sure you could get to 14kW fairly easily (you just need to make sure duty cycle on the motor is maxed - which means finding the pulley sweet spot (one advantage of a belt/pulley setup)). Basically you want phase current...

It made 17 more peak hp, but as you mention, the area under the curve is huge. Another thing to consider is the weather was horrible last thursday - it was around 90*; the time before, the ambient was around 65 degrees. Even with dyno corrections, it would've made even more - probably another...