Are those light bars?
Also, how would one mount a fridge slide on top of the battery in this arrangement?
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Are those light bars?
Also, how would one mount a fridge slide on top of the battery in this arrangement?
This is a drawing from Toyota's patent application for this layout about 7 years ago. Toyota knows. They chose to put it inside for some reason. I don't know what the reason would be though. It really screws up the cargo layout. The sequoia is probably the worst offender. IMO it would be less bad to stick it under the middle row like the tacoma/Tundra. At least in that case it's somewhere you're not using as often.
* side note - I really appreciate the patent art having the arrows designating up and front. I had no idea from the profile of the vehicle what direction was up or down.
The point is to protect the battery when off-roading?
TheLCProject
SILVER Star
In the patent drawing, it's still between the frame rails. Couldn't accomplish the same thing by getting it below the body, but still between the frame rails? Perhaps with a skid plate? Plus! You could buy an overpriced piece of sheet metal from one of our many vendors here to replace the cheapo Toyota peice.
In other markets, they do somehow put fuel additional fuel tank in that same spot and there's hasn't been an issue that I know of. I'd suspect a ruptured fuel tank is a bit more hazardous than some roughed up NiMH batteries.
Additionally, there's usually either a frame crossmember or a rear axle between that spot and the ground anyway.
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Battery need temperature conditioning to work properly. Also the spare tire is taking the room below the rear deck.
To put the battery below the body would need a lot more complex heating and cooling system like electric vehicle. Losing the spare might not be such a big deal. Although putting in the rear for vehicles with swing up tailgate are a pain. This is where the barn door like GX460 are actually make sense.
To put the battery below the body would need a lot more complex heating and cooling system like electric vehicle. Losing the spare might not be such a big deal. Although putting in the rear for vehicles with swing up tailgate are a pain. This is where the barn door like GX460 are actually make sense.
TheLCProject
SILVER Star
I'm sure there are others that know more about this than I do, but doesn't the OEM aux tank sit above the factory undermounted spare? I think that was the case for 80, 100, and 200, depending on model, of course.
forum.ih8mud.com
Pretty interesting (but old) paper/testing on Prius hybrid batteries: https://attachments.priuschat.com/a...l_Evaluation_of_Toyota_Prius_Battery_Pack.pdf
I'm sure temperature management has come a long way. I'd bet there's coolant involved in certain cases instead of the old forced air system. I'd be surprised if the temperature concerns can't be mitigated both inside and outside the cabin. I'll do some more reading and research.
They could also make a cutout in the body and put in a tub for the battery, still in the body but between the rails like a sedan's spare tire depression or the 70 series cargo area underfloor storage.
Factory sub tank - sourcing and fitment discussion
forum.ih8mud.com
Pretty interesting (but old) paper/testing on Prius hybrid batteries: https://attachments.priuschat.com/a...l_Evaluation_of_Toyota_Prius_Battery_Pack.pdf
I'm sure temperature management has come a long way. I'd bet there's coolant involved in certain cases instead of the old forced air system. I'd be surprised if the temperature concerns can't be mitigated both inside and outside the cabin. I'll do some more reading and research.
They could also make a cutout in the body and put in a tub for the battery, still in the body but between the rails like a sedan's spare tire depression or the 70 series cargo area underfloor storage.
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Which then takes up the space for the spare tire...
TheLCProject
SILVER Star
You're right. I reviewed a handful of old BaT listings and if it's got a tire on the back the sub tank is equipped, but if not, there's not a switch on the dash for the sub tank and the spare is underneath.
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Not correct. The factory subs occupy the space above the spare tire.
Aftermarket oversize subs require relocation of the underslung spare.
TheLCProject
SILVER Star
Now I'm confused.
Thanks for the help!
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Doesn’t it also result in the spare tire being lower?
No.
TheLCProject
SILVER Star
Ok, so you were saying my correction to come inline with M1911's opinion was incorrect and that my initial recollection was correct?
So certain overseas 80s, 100s, and 200s (maybe even 300s) can have both undercarriage sub tanks and spare? But in some cases the spare gets tossed on the back?
What about 90s, 120s, and 150s?
I know that the oem subtanks are quite a bit smaller than the aftermarket ones and that's precisely why I had the impression that the OEM subtank and spare could all reside underneath.
The 80/100 factory subs are 50 liters and they occupy the open space above the factory spare.
Factory rear-mounted spares are independent from subtanks. I do not know the capacity of the 200 sub. I don't believe Prados have been offered with subs.
Factory rear-mounted spares are independent from subtanks. I do not know the capacity of the 200 sub. I don't believe Prados have been offered with subs.
TheLCProject
SILVER Star
At least one example:
For at least the 2023 Prado (150), it appears that yes it can have a subtank, but only if the tire is on the door. I'd presume the same situation for the 90 and 120 as well.
For at least the 2023 Prado (150), it appears that yes it can have a subtank, but only if the tire is on the door. I'd presume the same situation for the 90 and 120 as well.
I'm not clear what you are trying to convey.
What I am stating is that factory subs do not lower the location of the underslung spare tire mounting.
What I am stating is that factory subs do not lower the location of the underslung spare tire mounting.
TheLCProject
SILVER Star
We are good and on the same page. You are supporting my initial claim (that I later doubted myself when I saw some examples and couldn't quickly find the parts diagrams) that the OEM subtank and underslung spare can coexist.
I retro-fitted a factory 50 liter sub to my 80 ~20 years ago. It clears the factory spare tire crossmember. I have a very early first generation Slee rear bumper so my spare is on the back. The space below my sub is now occupied by an in-frame receiver trailer hitch.
SUMMIT CRUISERS Jr
SILVER Star
Assuming the battery pack takes up roughly the same amount of space as this auxiliary tank, I’d be absolutely surprised if someone were getting that area hung up and scraped by rocks on a new 250. Even if that were the case, it would be an easy area to protect. Maybe the 250 has more exhaust components in that space.
Knowing how hot the floor of my 80 gets back there, I’d be more worried about batteries sitting on top of that versus suspended between the frame rails with some heat shielding in places and either airflow or coolant circulating to cool the batteries.
bjowett
Supporting Vendor
Sub tank on the 300 is up in front of the rear axle next to the muffler, which is turned sideways to accommodate it. Also the reason for the small 8 gallon size.
