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Wow this thread is... I don't even know what to say. drat. I want to see PCB designs! (And also more of everything else)Raluek posted:yeah this mentality really turns me off of lemons, tbh. it turns it into a popularity contest, instead of who can build the best car they can within the rules. and the organization being able to wipe out all that hard work with $500 in cash really sucks too. I think part of it is that they tend to give you more leeway if you aren't cheating to win. Like, cheating to make your extremely poor choice of a weird motor swap that you can't get parts for anywhere hold together for anything approaching an entire race is not going to bother anyone because you're just trying to have fun, but cheating specifically to make your super reliable engine in a super reliable car much faster, that's not cool.
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Feb 26, 2023 19:59
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| # ¿ May 9, 2024 23:18 |
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That all looks pretty great! Interesting idea making it kind of a backplane in a card cage, too. If you were to go to production with this I'd suggest moving the Arduino components directly onto your cards and stripping out any extraneous stuff you aren't using on them, but for one offs for racing this looks very solid. For telemetry I would consider a 900MHz link, either serial extender type or possibly ZigBee. I used this for a very similar application (flight testing an experimental aircraft) and we had pretty good telemetry coverage out quite a ways.
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Mar 1, 2023 23:13
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It looks like I totally brain farted and yeah ZigBee is 2.4 ism not 900 ism. Advertised range is up to about 100m, you might be able to extend that using a vertical collinear dipole antenna for the paddock base station and stick it on the tallest post you can manage. I see some products advertising up to 2km on ZigBee but never used them and can't vouch for them. If anyone on your team is a ham radio operator you could use the ham 900mhz band at basically any power level you could conceivably desire using 900MHz handheld radios along with some home brew FSK modulator/demodulator setups (mod should be easy, I may even have a circuit for it on hand, demod with an RTL-SDR?) as long as you don't encrypt, pause regularly, and identify regularly. That is, if you don't want to use the mid 3 figure price tag 900MHz rs232 extenders I'm seeing online, which seems like a waste of money to me.
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Mar 2, 2023 03:43
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Oh hey, a maxim max9924! I used its cousin, the max9927, on the transmission control unit I designed sometime between 2014 and 2017. I like them a lot more than the lm1815.
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May 6, 2023 15:50
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They're pretty much the same AFE wise, the only difference is some have more than one channel and some have a built in quadrature direction detection gate in them IIRC. I've never used that feature since I was monitoring input shaft and two output shaft speed sensors on a gearbox as well as a CVT output sheave speed sensor with them. Edit: just got back to my PC and it looks like a few also have fixed gain while a few others allow external gain resistor use and it's only the 9926 that has the quadrature output. kastein fucked around with this message at 08:07 on May 7, 2023 |
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May 7, 2023 03:57
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Oh hey an A340!
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May 22, 2023 08:06
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I'd definitely suspect battery. When the battery in my daily was dying a few days ago, it wouldn't start correctly because it's an old design with a variable reluctance ckp that doesn't really read very well till you have it going a few hundred rpm. And it couldn't maintain that RPM while also sufficiently powering the ECU unless I floored it straight into flood clear mode, so it would crank very slow and not start because the ECU and/or ckp were on strike from low voltage, I'd floor it to get it to spin fast enough to wake up, then release throttle to actually get it to start. The massive backfire sounds like it's waking up just enough to go huh??? And try to start right as it spins down, maybe. Put a new battery in it (or just jump it off something else with beefy cables or steal something else's battery, if you're lazy or cheap like me) and see what happens.
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May 29, 2023 08:49
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Wow! That would do it 
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May 30, 2023 08:53
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Maybe a harness issue? One broken wire could easily kill power to 3 injectors
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May 30, 2023 18:19
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That looks like alignment was bad enough that I have to ask, do you have both bellhousing to block alignment dowels? For the rear axle, consider a 97-01 Jeep XJ rear 8.25. the Dana 35 that came in some of them is garbage but the 8.25 is fairly solid. Not 8.8 solid but solid. Pinion is roughly centered, may actually be perfectly centered I'm not sure, 5x4.5 pattern, you can disc brake them with Jeep liberty KJ parts, or even use a KJ rear if you're coil spring anyways.
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Jun 14, 2023 07:07
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Oh no. My condolences. Wish I'd thought to bug you on the way by because I spent all day in Denver last Tuesday. You are far from the first person to make that mistake and I'm sure won't be the last either.
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Jun 16, 2023 04:04
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I really can't tell anything from that pattern, I'd leave it alone till your good marking compound arrives. The shim issue is actually a common thing in Dana Spicer land IIRC, many of their shims are like that and rely on the press fit bearings to push them up into the corner. Carl Jantz from Jantz Engineering talks about it a bit in one of his gear setup videos IIRC.
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Jul 2, 2023 19:45
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Holy poo poo, it's weird seeing a Raider. Those things are so rare now.
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Jul 23, 2023 05:50
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Oh poo poo! Honestly, what this tells me is your alt feed fusible link or fuse is not present or incorrectly sized. It should have blown well before any of that catastrophe got rolling. Typically I see them sized at 125% of alternator rated output.
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Aug 17, 2023 08:43
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Welds look fine but I'm a bit concerned about how you're going to get that flange onto the stud and put the nut on now.
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Aug 21, 2023 22:15
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Obviously the answer is LS swap it. Whether you take that to mean Lexus ls400 donor or GM LS engine is left as an exercise to the reader.
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Oct 20, 2023 07:18
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That looks like inverted 45 degree flare to me. Used on most of the brake systems I work on.
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Nov 14, 2023 01:28
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Oh wow, that transmission is loving done.
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Dec 11, 2023 21:12
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Fog it with oil, I see flash rust starting and you don't want the same thing to happen again when it sits for a few years because you got distracted.
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Apr 14, 2024 22:27
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| # ¿ May 9, 2024 23:18 |
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Well this thread jumped the shark in an amazing way, I didn't expect to see home brew supercharger intake casting planning today but here we are. Love it.Commodore_64 posted:Sorry to be coy / not explain fully. I was just wondering if it could be cast from the standard crucible a hobbyist electric furnace. Something like https://www.amazon.com/TOAUTO-Upgra...142&sr=8-2&th=1 Aluminum casting has been something I've been intending to get into one day for a while now, you're in the greater PDX area right? Lemme know when you have more solid plans and I'm down to be a second or third set of hands on the project, I'm only a few hours away now. I've done a bit of background research and a little very amateurish casting using scrap 6061 (not ideal, you want a356 or a357 or similar) decades ago but not really anything of note. Depending on Dr Rocksalt's interest in us derailing his thread we might want to move the discussion elsewhere though
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May 4, 2024 09:26
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