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hispls

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About hispls

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  1. How many alternators? Also the weight of that bank. Ouch. You'll probably get smoked with taxes too, for now the tariff on batteries from China is only a few percent for us (though there's talk of 25-27%). Then again, I reckon you're paying high just for AGM and everything else there. I'm really happy with these cells and it seems a lot of people are starting to order them. We have already had a couple 30 degree mornings with no loss of performance. So far so good.
  2. Working on getting my brother's Civic hooked up. Not sure if the am is going to fit end to end between those hinges mounted vertical which was rather my plan, but I don't think he cares about trunk space here. I had run some wire from the trunk to the front with the intent of setting up a voltage display up there. He never ordered one when we did the build and now that we finally got one I can't remember where I left the front end of it so I'll need to do some digging. Hopefully I have time to wire this all up and mount the amps this weekend. Winter is coming quick; short days and very soon to be uncomfortable temperatures for working outside.
  3. Next on my agenda is more subs (somehow). My subs get pretty warm before I can drop more than .2V. Lack of battery reserve is probably why these subs have survived as long as they have for me. By the time subs got stinky before I'd need to give it a rest because my voltage would get so low. This will be done cleaner at some point whenever I'm caught up with work and get the second amp back.
  4. They are the YingLong brand. I was looking into LTO and saw some fellas in Russia using these claiming very good results. I bought mine through Shenzhen Baiguan Battery Co., Ltd off of Alibaba. I was very happy with service and communication and everything arrived as described. As an update I think the guys at Wolfram organized the recent group buy of these cells also through that vendor.
  5. 6S banks are useful at high 14V, a couple guys using them charge at 15.5 7S banks should be excellent for 18V. Get you an 18V bank, charge @ 18.5-18.9 and pull a terminal at 5S to power vehicle and other stuff that won't be happy with high voltage LTO is considered even safer than LiFePO4. a quick google search will provide videos of them being grossly abused with no catastrophic (read fire) type failures. Toshiba cells can be found used scrapped out of EVs, but as you say, not only will they not sell to anybody who isn't using tons of them in big scale manufacturing they won't sell them to you until you send someone to Toshiba to be trained! Altairno cells are a little easier to obtain though and there's a couple Chinese companies making them. That said, I bought some cells from China recently and just installed them this weekend. There's some other folks using these now and apparently a group on Faceberg just made a large order for them. I'm super impressed so far. I have a very large Korean amp here. Replaced 3 110AH and 5 55ah AGMs with these. Previouisly bass race for 30 seconds would drop me from 14.4 to 12 or below, these drop barely .2V (240AH bank).
  6. Neodymium motors have been around 10 years anyway, I like em for the weight savings mostly. They'll give the top tier competitor an edge (most importantly with extreme power levels) but for practical purposes 1dB or so that they gain is still nearly inaudible. I'll have to agree that all around subs that'll handle huge power mechanically are a lot more accessible, as is cheap power. Lithium I still think is the biggest win for pretty much everybody. Sacrificing so much space and carrying the weight of AGM batteries has been a very big limiting factor. That is very much the sort of thing I'd try to build in a trunk if I were to try to build up a trunk car.
  7. One thing to consider is if OP plans to compete putting wood on the roof would put him into extreme modified class. Otherwise, it'll almost definitely help get louder and prevent destroying things.
  8. hispls

    Can bad box make subwoofers get hot?

    Warm sounds pretty normal. Port length should be measured along the center of the port, then add half a port width for any opening that has one side part of a wall.
  9. So looking at DB Drag records, there's a fella from Brazil doing crazy trunk numbers with 1st and 2nd place world records and the next guy in line is almost 6B behind that. The point being, the list of guys doing 155+ out of a trunk has to be very short. If I'm wrong, I'd love to see what these guys are doing. Not like I'm going to try to get a trunk loud but I'd be fascinated to see who is doing what.
  10. hispls

    Help Needed Pls

    If you plan to run 2 15s in a Honda coupe you'd better be planning a wall build. How to avoid making a box that won't fit in your trunk (yep, we've all done it).
  11. Meh, not really. TC 4hp (TRF, TSNS, etc.) Shocker Sig, RE MT, DD 95XX came out @15 years ago and any of those will hang with anything in production now and most of the Korean class D amps are still basically the same circuit they have been, Brazilian amps have been around a decade anyway. The only real game changer for trunk builds by my estimation is battery technology which is really huge. Seems like OP is set on that bandpass. I guess because they look more complicated people think they are better? There's no bandwidth for efficiency trade you can't do the same with traditional ported design and by the time you make a very wide flat response you're down to the efficiency of a sealed box. The real drawback I see is the extra complexity making more places for things to go wrong, and the issue of being able to audition new subs. Most modern high output subs are designed to function best in ported alignment.
  12. Made my personal best SPL score this weekend.  158.7  (DB drag style)  Waiting on batteries now that should get me to 160

  13. Every one I've seen has been like Thor's.... sealed off at the rear seat and ported. I've seen Thor's 10's, I've seen a couple similar with 12s and there was a guy up my way who had a single 15 and a big slot port that did 150 and change on 5K (he used both the AB 500.1 and Atomic 5K) out of his Civic trunk, he owned and tested most of the big boy SPL subs at the time: DC LV5 and 6, DD9515, Shocker Sig, TRF, Sundown Zv2 all got him 150 and small change. IIRC he did 151 and a bit on two AB 500.1s. Downside was that none of those subs really liked 5K. One hard bass song would make them stinky. AFAIK Terry Brocks isn't sealed off but a fart box with a huge forward firing port all the way to the back of the trunk subs up. He is an anomaly and likely has a lot more tricks up his sleeve to get to where he is out of a trunk. Spend a decade building and tweaking trunk boxes like it's your job and you can probably get where he is.... I wouldn't even mention him in a trunk build discussion because what he does is just so far ahead of the pack it's scary. Anyway, single 15 on 5K should get you there if you build a good box, seal off the trunk 100%, and do some tweaking and testing. Pair of 12's may have been better for the sake of double the thermal power handling all things being equal.
  14. Accelerator or no, it is very brittle. CA glue is unbeatable for some applications but I wouldn't trust it for what OP is doing. I also would expect it to shatter under vibration. JB weld is very good for metal on metal and is very solid when cured. Might give that a whirl. That said, I think something else is going wrong if the rivets are spinning, specifically slightly too large hole.
  15. Why not just use two of the 7500s? The difference between 15,000W and 20,000W real world would be <1dB and inaudible. If you're chasing 10ths you could probably invest your money better into going up to 18V (assuming those amps will take it) or otherwise beefing up your electrical system. You really can't over do it on electrical upgrades.
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