SSM Build - Weight addition strategy/location - LotusTalk - The Lotus Cars Community
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post #1 of 21 (permalink) Old 05-25-2017, 06:45 AM Thread Starter
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SSM Build - Weight addition strategy/location

I'm slowly building into SSM. At this point I'm classed locally, but I can't do any bigger events because I'm underweight.

Others in SSM, where did you add weight? What material did you use? I believe I'll need to add at least an extra 100-150.

I was thinking of building some kind of cross brace for under the passenger seat and putting some steel plates on it as a start. Where else do you add?

Thanks, all comments welcome.

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post #2 of 21 (permalink) Old 05-25-2017, 06:58 AM
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Why not just bolt the plates right to the floor pan there? Big washers and done! I know fred told me he has his under his passenger seat, but not sure how much or how attached.

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post #3 of 21 (permalink) Old 05-25-2017, 07:50 AM Thread Starter
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I was worried about putting so much weight on the floor pan. Just bolting it down would definitely make life easier; I was trying to limit the number of new speed holes I needed to create.

What material did you end up using? Any resources for finding them?

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post #4 of 21 (permalink) Old 05-25-2017, 08:25 AM
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Do you have a stereo in the car yet? I am adding weight under the custom made sub box I am putting in the Passenger foot well. This also distributes weight to the front of the car a little more.

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post #5 of 21 (permalink) Old 05-25-2017, 08:40 AM
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I only have to put 30 lbs in mine for Nasa TT3 so I wasn't as worried about the weight. Mine is under the carpet on the passenger side and you can barely tell it is there!

For the metal I used 1/2 in plate cut to 1' square and 12x6" from the local welding supply house. They weigh 20 and 10 lbs. If you used 2" and placed it in the same location you could put 120 lbs there. If its safe to put that much on the floor pan is beyond my knowledge, but I know that I can stand on the pan from experience at 210 lbs...

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post #6 of 21 (permalink) Old 05-25-2017, 09:01 AM
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https://www.lotustalk.com/forums/f99/...52/index2.html

dunno anything about this but was curious....
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post #7 of 21 (permalink) Old 05-25-2017, 10:03 AM
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I think you just need to eat more!
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post #8 of 21 (permalink) Old 05-25-2017, 10:54 AM Thread Starter
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Quote:
Originally Posted by Tazicon View Post
I think you just need to eat more!
If only they weighed the car with me in it, I'd be all set! From what I understand, you're allowed to refuel up until the last run. After the last run, you pull off and straight onto the scales.

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post #9 of 21 (permalink) Old 05-25-2017, 11:13 AM
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Steel beams with melted lead shot poured into them in a cage bolted to the the passenger footwell where the footrest use to be in my car. Don't have any pics handy but its relatively easy to add/remove weight as we run the car in SSM with the weight and XP without.

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post #10 of 21 (permalink) Old 05-25-2017, 12:21 PM Thread Starter
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Quote:
Originally Posted by dallasreed View Post
Steel beams with melted lead shot poured into them in a cage bolted to the the passenger footwell where the footrest use to be in my car. Don't have any pics handy but its relatively easy to add/remove weight as we run the car in SSM with the weight and XP without.
Ideally, I'd like for it to be easily removable like that. Smelting lead shot and pouring it into a cage might be a bit beyond my abilities yet, but I'm definitely interested! Do you have any photos of your setup?

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post #11 of 21 (permalink) Old 05-25-2017, 12:32 PM
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I have a few items that act as ballast.

1) I used double stick tape to attach two 5lb weights to the floor directly under the passenger seat.
2) I drilled through the passenger seat and used carriage bolts to attach a 30lb bar of lead to the seat. I pulled back a bit of the cushion to gain access. You can't see it.
3) There is a collection of steel bar and angles weighing 35lbs that's bolted to angles that go under the front sway bar. The angles replace the spacers between the bar clamps and the car.
4) E153 trans
5) turbo and supercharger, 2 intercoolers and 3 heat exchangers and fans.
6) splitter
7) wing

I'm going to move the 30lb bar to the underside of the crash structure to get some more weight on the nose.
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post #12 of 21 (permalink) Old 05-25-2017, 01:44 PM
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Quote:
Originally Posted by glagola1 View Post
I have a few items that act as ballast.

1) I used double stick tape to attach two 5lb weights to the floor directly under the passenger seat.
2) I drilled through the passenger seat and used carriage bolts to attach a 30lb bar of lead to the seat. I pulled back a bit of the cushion to gain access. You can't see it.
3) There is a collection of steel bar and angles weighing 35lbs that's bolted to angles that go under the front sway bar. The angles replace the spacers between the bar clamps and the car.
4) E153 trans
5) turbo and supercharger, 2 intercoolers and 3 heat exchangers and fans.
6) splitter
7) wing

I'm going to move the 30lb bar to the underside of the crash structure to get some more weight on the nose.

What are your thoughts on weight placement at center of mass vs at the nose like that. I was told to get close to COG, but it seems to make sense to me to put it farther forward? I just put mine in the passenger seat floor for now cause it was easy.

2007 Exige S with almost every track mod...
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post #13 of 21 (permalink) Old 05-25-2017, 07:39 PM
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I think the person meant center of polar moment not center of Cg. You want it as low as possible though. Moving it forward or rearward is not the end of the world? if you get any other weight benefits you are looking for. However, no exceptions to as low as possible.

Last edited by fzust; 06-14-2017 at 03:43 PM.
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post #14 of 21 (permalink) Old 05-26-2017, 10:18 AM Thread Starter
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Great advice guys. I appreciate it.

Glagola, that is great use of weight. Anything that has a dual purpose resonates with me. Adding weight just for the sake of weight hurts me.

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post #15 of 21 (permalink) Old 05-26-2017, 11:03 AM
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my personal favorite multipurpose is Fred having multiple heavy batteries in his car as ballast. Were I to do things over or redo I'd probably do the same. The lightweight batteries aren't the most reliable
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post #16 of 21 (permalink) Old 05-26-2017, 11:07 AM
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Quote:
Originally Posted by dallasreed View Post
Steel beams with melted lead shot poured into them in a cage bolted to the the passenger footwell where the footrest use to be in my car. Don't have any pics handy but its relatively easy to add/remove weight as we run the car in SSM with the weight and XP without.
An internet post with "melt" and "steel beams" in one sentence and no mention of "jet fuel?"
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post #17 of 21 (permalink) Old 05-26-2017, 11:52 AM
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I found some cheap weights on amazon [ free shipping ! ] and used those in my Elan. We built a frame and bolted them into the seat bolt holes [ and some additional hole were made as well ]
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post #18 of 21 (permalink) Old 05-26-2017, 06:47 PM
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This thread makes baby Jesus cry.
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.
d.a..v...i....d

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post #19 of 21 (permalink) Old 05-27-2017, 10:58 AM Thread Starter
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Quote:
Originally Posted by dallasreed View Post
my personal favorite multipurpose is Fred having multiple heavy batteries in his car as ballast. Were I to do things over or redo I'd probably do the same. The lightweight batteries aren't the most reliable
Now that I'd love to see. To be able to leave my car for more than a few days without having it completely discharge AND help with my weight issue? That sounds perfect

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post #20 of 21 (permalink) Old 06-14-2017, 11:20 AM
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heres what I'm working with for reference

2005 Lotus Elise turbo k20a2 757whp 536wtq 31psi [email protected]
2005 Lotus Elise 2zz supercharged 'streetable' race car
2007 Lamborghini Gallardo Spyder
2010 Ford F350
2004 Mazda RX8
2007 Mazda Mazdaspeed 3
2010 Ford Fusion Hybrid
I passed my license test in a 3cyl 70hp Geo Metro
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