Where to remove weight from a track only car?
#341
Here is another cheap battery I found:
A123RC 16 Cell 4S4P 13.2V9.2AH motorbike battery starter in a hard plastic case_26650_A123 start battery_A123 RC Battery|High Quality Battery|Wholesale Ebike Battery
Research shows that the cells are either b grade a123 or some decently performing knockoffs. $180, free shipping, and they take paypal. The deltran and ballistic 16 cell batteries are ~$300.
A123RC 16 Cell 4S4P 13.2V9.2AH motorbike battery starter in a hard plastic case_26650_A123 start battery_A123 RC Battery|High Quality Battery|Wholesale Ebike Battery
Research shows that the cells are either b grade a123 or some decently performing knockoffs. $180, free shipping, and they take paypal. The deltran and ballistic 16 cell batteries are ~$300.
#342
Another thread bump of battery research. These companies don't share much information about what is actually in the box, so I have to infer a lot of this based on the stats. Also, LOL at voltfreaks. Cheaper prismatic pouch cells and they charge $649. It would also be interesting to find out if all of these companies are using legit a123 products or sourcing their cell from china/grey market alternatives.
Alien Motion looks like a good cheaper alternative to ballistic.
https://i.imgur.com/k64Qhpy.png
Also, I would like to point out that the braille battery posted earlier is rated at 7 amp hours but is made for a 2p4s array of 2.3AH cells- It's at best a 4.6AH battery and they make no attempt to refer to it as PbEq AH. It's basically exactly the same as this battery but with terrible contruction and no balance port: http://www.ballisticparts.com/produc...roducts_id=425 And they still offer it at $400: https://www.braillebattery.com/index...batteries/ml7t
Alien Motion looks like a good cheaper alternative to ballistic.
https://i.imgur.com/k64Qhpy.png
Also, I would like to point out that the braille battery posted earlier is rated at 7 amp hours but is made for a 2p4s array of 2.3AH cells- It's at best a 4.6AH battery and they make no attempt to refer to it as PbEq AH. It's basically exactly the same as this battery but with terrible contruction and no balance port: http://www.ballisticparts.com/produc...roducts_id=425 And they still offer it at $400: https://www.braillebattery.com/index...batteries/ml7t
Last edited by asmasm; 10-17-2015 at 11:58 AM.
#344
SADFab Destructive Testing Engineer
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You have issues. vbands are worth any weight penalties just in ease of use.
#346
Thanks. Fasteners and gasket for a 2 bolt flange came in at almost exactly 4oz. The V-band is ~ .4lb lighter. If you have two clamping areas in your lightweight exhaust saving almost a full pound while using easier to take apart Vbands is a win win.
My current exhaust plan is:
20 gauge burns 2.25" with a scrubble packed burns stainless muffler in the middle. The far end of the tail section would be a vibrant 2.5" aluminum muffler.
Weight breakdown looks like this:
5 feet of 2.25 20 gauge - 6.64lb
Burns muffler SM-225-450-14-SC - 3.4lb
Vibrant 2.5" aluminum muffler - 2.5lb
2 sets of vband clamps- 1.6lb
14.14lb without including weight for hangers. Realistically 5 feet is more tubing than needed.
My current exhaust plan is:
20 gauge burns 2.25" with a scrubble packed burns stainless muffler in the middle. The far end of the tail section would be a vibrant 2.5" aluminum muffler.
Weight breakdown looks like this:
5 feet of 2.25 20 gauge - 6.64lb
Burns muffler SM-225-450-14-SC - 3.4lb
Vibrant 2.5" aluminum muffler - 2.5lb
2 sets of vband clamps- 1.6lb
14.14lb without including weight for hangers. Realistically 5 feet is more tubing than needed.
#347
I am planning a prepreg NA hood with integrated headlight covers. I don't know how much the stock hood latch and hinges weigh so I am assuming zero for them. The actual savings would be this number + the weight of those parts. Also, the materials cost would be about $500 + cost of mold making:
https://i.imgur.com/EUOcJ5L.png
There is probably 15+lb to save from stock.
https://i.imgur.com/EUOcJ5L.png
There is probably 15+lb to save from stock.
Last edited by asmasm; 02-18-2016 at 01:05 PM.
#348
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Just make sure it's rigid; use a core, don't go single sheet. There's a lot more force acting on the hood than some realize.
I have a dry carbon hood here with integrated headlight lids, foam core. 10.9 lbs. Lighter than stock, but it could've been better if whoever made it hadn't used an unnecessarily liberal amount of epoxy or similar bonding agent between the top skin and the perimeter frame on the underside. That frame is also about twice as many layers thick as it needed to be.
I have a dry carbon hood here with integrated headlight lids, foam core. 10.9 lbs. Lighter than stock, but it could've been better if whoever made it hadn't used an unnecessarily liberal amount of epoxy or similar bonding agent between the top skin and the perimeter frame on the underside. That frame is also about twice as many layers thick as it needed to be.
Last edited by ThePass; 02-19-2016 at 03:11 AM.
#355
I had my tub sandblasted, but not dipped. I didn't think about having it dipped to get the rest of the crap off. So whatever the sandblasters didn't get I scrapped off, wire wheeled off, and cussed off. I will weigh the tub when it gets back from powder coat, and then see how much crap I add in the car for a total dry weight once I am finished with it.
#356
I had my tub sandblasted, but not dipped. I didn't think about having it dipped to get the rest of the crap off. So whatever the sandblasters didn't get I scrapped off, wire wheeled off, and cussed off. I will weigh the tub when it gets back from powder coat, and then see how much crap I add in the car for a total dry weight once I am finished with it.
- Is that 1.75 tubing for the whole cage? Looks fat but maybe that's an illusion.
- With the extensions into the engine bay, what class/org is this being built for?
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#357
It is indeed 1.75" that's why it does look a lot heftier than any 1.5" rollcage. There are 1.5" gussets in the rollcage. This is going to be a car I run in any type of unlimited class. SU/TTU with hopes of going and doing things like Pikes Peak next year and eventually try and make some Bonneville runs with a real tall gear. This is a turbo V8 car, so being 1.75" and a little over built is really fine with me. I realize most if not all sanctioning rules only require 1.5" .120" mild steel for up to 3000lbs I really want to walk away if/when I wad this thing up in a wall at 150mph. And with it being an iron block and all the other crap it'll probably be 2500lbs without me in it.
#359
My front crash bar was all bent up and I was looking for something to test out my new carbide tipped metal cutting blade on:
The plan is to cut out most of that front structure and then drill the spot welds to get the heavy stuff off of the frame rail. Then a 1.5x.095 tube with some gussets kind of like this:
I was disapointed to find out the center section of the crash bar was flimsy and only weighed about 3lb. All the thick stuff is in the area where the tow hooks mounted and where the crash bar ties into the frame rails.
The plan is to cut out most of that front structure and then drill the spot welds to get the heavy stuff off of the frame rail. Then a 1.5x.095 tube with some gussets kind of like this:
I was disapointed to find out the center section of the crash bar was flimsy and only weighed about 3lb. All the thick stuff is in the area where the tow hooks mounted and where the crash bar ties into the frame rails.
#360
Front crash bar is a total of 6.61lb if you remove all the tow hook reinforcement like this:
It looks like my replacement bar will be just under 4lb if I use 1.5x.095 and 9 square inches of 12 gauge. Not a lot of weight to be saved here.
Those tabs, are they just for mounting AC stuff? No aftermarket radiators use them?
It looks like my replacement bar will be just under 4lb if I use 1.5x.095 and 9 square inches of 12 gauge. Not a lot of weight to be saved here.
Those tabs, are they just for mounting AC stuff? No aftermarket radiators use them?