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Welcome!

Casting your own back plate is awesome. I love all the stuff you guys are trying. I'm not sure I would TIG that casting to the backplate for fear of warping it - maybe some sort of mechanical attachement method might avoid that issue and maybe give you room for a little adjustment?

I use fine sandpaper to clean the contacts before I bolt them on with noalox - something in the realm of 240-600 grit (usually whatever I can find first). There's about a half a volt difference between copper and aluminum on the galvanic scale, with copper being more noble than aluminum...

Awesome! I'm really impressed with the rpm you're able to hit. As for the battery, when you're internal resistance limited, it's better to have fewer cells in series. Do you have enough cells to do a 2p setup? That would in theory cut your voltage drop under load. LiFePo4 cells are a good...

I really like your crimp solution. I have a hydraulic crimper, but it's designed for metric wiring - so not all awg cables fit the dies well. You've given me a great idea on how to make the correct dies fairly easily. Thanks! Though the more I crimp heavy cables the more I like this...

Thanks for posting this - I wrote a long reply asking for this stuff in the battery thread, then I saw you were already doing it here. Can you post pics of the the car's engine and your surrent e-boost setup and your datalogs and stuff here? I feel they're getting lost in the battery thread...

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...