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Discussion Starter #1
Yes, I'm that Bolt owner who would lower the suspension. Not slam it, I'd like to see it down about 1-1.5". Would likely help aerodynamics (=range) and handling a bit, along with some better handling tires (I'm really hoping that no season, low rolling resistance tires improve!). Not especially concerned about the batteries vs road hazards as the Bolt seems to sit quite a bit higher than the Volt and Teslas. Hoping someone comes out with an inexpensive and sane aftermarket solution. And maybe a replacement rear spoiler with a slight lip or incline (instead of decline)?
 

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Hm.. It would be interesting to see a bolt lowered to a close to flush fitment lol. I can guarantee someone will get around to making it happen but you may have to wait a while
 

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I can't see why the aftermarket companies won't come out with some kind of Bolt lowering kit if there are lowering springs for the Volt which sits lower than the Bolt. Would be interesting to read a mileage comparison review from you after the suspension changes.
 

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If we can see some coilovers, not only will the vehicle sit lower, it'll be lighter in components which will aid as well theoretically
 

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Discussion Starter #5
I've really liked the coilovers in my TT, (H&R), but have not taken advantage of raising and lowering the suspension for winter/summer, more of a set it and forget it kind of thing. Went with a good sport spring/shock combo for our family wagon (A4) and have been very happy. A coordinated combo like that would be the best combo for economy vs. performance in the Bolt, imho. That is, if I can find a decent set of LRR tires that I can live with.
 

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Try the system that uses airbags to lift and lower the suspension on other GM vehicles. Maybe they will have a kit for the Bolt EV, so you can lower it when needed and also lift it when traveling over rough roads and climbing curbs.
 

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I've really liked the coilovers in my TT, (H&R), but have not taken advantage of raising and lowering the suspension for winter/summer, more of a set it and forget it kind of thing. Went with a good sport spring/shock combo for our family wagon (A4) and have been very happy. A coordinated combo like that would be the best combo for economy vs. performance in the Bolt, imho. That is, if I can find a decent set of LRR tires that I can live with.
The enclosed underbelly of the Bolt might present some challenges with suspension changes, but won't likely know until you get your hands on one to check it out. It'll be plastic and easy to cut/modify, but might sacrifice some aero.
Re: LRR tires. If performance is your priority, ditch them completely and buy what you want. Teslas don't come with them, and on the owners forums those that have switched get about 2-4% more range (over the OEM). But only at the beginning of tire life. As tires wear, rolling resistance decreases and by the end of the tires life they are very similar. When fitting new tires (OEM), they report a drop in range from the worn out ones.
 

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I tried to look for a picture of the chevy bolt's undercarriage to see if thee's enough uncovered space for suspension access but it's like trying to find a unicorn. Guess we'll have to wait and see.
 

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Discussion Starter #9
Very interesting thoughts, you two, thanks. I'm sure they'll do some aero work underneath, yes, but hopefully not so much in the wheel well/suspension areas? Eventually the springs and shocks would have to be replaced, so they have to be able to come out. A little lower (again, not looking to slam it, maybe 1-1.5" lower) would probably help the Cd anyway. I know the suspension engineers know their stuff better than me, but they're also beholden to the wish to try to present this car lifted as a "CUV", and I just want it to handle as good as it can. Use that nice low center of gravity for handling more like a Tesla. Springs, shocks, ?thicker rear stabilizer bar

Wonder when a repair manual will come out for this car? I'll be looking carefully at available space in the rear end of the car anyway to look for additional cargo area space for a small subwoofer (and additional cargo). From the cutout / chassis pics I've seen, it's not clear to me that all available space behind the rear axle has been captured in the cargo bay. We will see! : )
 

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I'm sure you're familiar with the black airflow deflectors under the front of most cars (front bumper and partway under the engine compartment). Imagine that extending to cover the entire underside of the car and you'll have a pretty good idea of what you'll find on the Bolt (and many other EV's).
It's a 2 piece job on the Fit EV - parts diagram:

You can see the notches for the rear suspension near the back and the channel for the drive shafts in the front section.
 

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I like how protected the underside is going to be fully covered. No worries of any road debris damaging the underside of my car. Happened to me one on the highway at night and it loosened a plastic panel on the underside of my car.

Probably going to block off access to the areas you need to make suspension changes.
 

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That will help a lot come winter time. The only issue is we have to keep an eye on where salt could get in and linger around. I will NOT like having to remove the covers just to ensure i'm proactive against corrosion and that's something all of us northerners need to do. Also not exactly the easiest thing to do on your own.
 

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That looks like more unused volume than I expected. Don't know why they didn't square off the spare tire tub.

I'm still hopeful the chassis can handle a real rear suspension for a future variant.
 

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I was able to snap a couple pictures of the rear suspension. It appears that there is quite a bit of room as the battery stops several inches forward of the rear springs.
Thanks for the pics. Quite a simple suspension design that seemingly returns good handling characteristics based on what has been published about the Bolt's driving prowess. It looks like a torsionbar/swingarm design.
 

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Discussion Starter #16
About that wasted cargo space...

That looks like more unused volume than I expected. Don't know why they didn't square off the spare tire tub.

I'm still hopeful the chassis can handle a real rear suspension for a future variant.

I've been looking at this apparently unused volume as well on the drawings and photos I've seen. Not sure why there's so much wasted space in a compact CUV where space utilization should be (and otherwise seems to be) king.

Aero considerations maybe? Allowing pressure out from under the car to avoid rear lift?

Any reason not to cut out and mold in a lower floor that better utilizes the space?? Yes I realize this is being a little adventurous, but I want the cargo space, potentially a spare tire, and subwoofer.
 

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Aero considerations maybe? Allowing pressure out from under the car to avoid rear lift?

Any reason not to cut out and mold in a lower floor that better utilizes the space?? Yes I realize this is being a little adventurous, but I want the cargo space, potentially a spare tire, and subwoofer.
As far as aero, the best aero could come from filling that space. I expected to see a plastic rear valance that went from the rear lower battery area to the rear bumper. That would cover the spare tire tub.

Here's a view of this area from a GM promo video:

There's a video somewhere of the Chief Engineer lamenting having to have the spare tire tub in the car. It could be for rear crash protection, or for markets that mandate a spare tire. I'm not sure. The tub in the Premier has the L1 EVSE, tire inflator and subwoofer. Cutting out that round tub for a square one doesn't appear to add enough volume to be worth it.
 

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That's definitely a great deal of space and making suspension changes would be a breeze. With all of that room though, I'm pretty sure building a nice diffusor for underneath would be fairly simple to aid ?
 

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From the Chevy Bolt EV site:
ENCLOSED, FLAT UNDERBODY
Because batteries do not require air for combustion, an enclosed, flat underbody streamlines airflow and improves aerodynamics
Stops short of the rear wheels?
Many EV's carry it all the way back to the rear bumper.
In photo number 2 from astricklin, it almost appears like the underbody panels were not installed on the car at the show for some reason. You can see some of the metal framework holding the batteries.
 

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In photo number 2 from astricklin, it almost appears like the underbody panels were not installed on the car at the show for some reason. You can see some of the metal framework holding the batteries.
I didn't notice that, but you are correct. I wonder if they had them removed to be able to disconnect the battery. All of the ICE vehicles have to have their battery disconnected so that it doesn't get run down, people aren't blasting the radios, locking the doors, ect.
 
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