Full size spare cover
 

I hate not having a full sized spare tire. The hassle of not being able to use it at the rear of the car, the speed and distance limitation, etc.

Does anyone know the part number of this trunk mat which makes room for a full sized spare? I'd like to see if my local US-based dealer can get their hands on one....and if not, any ideas where I could find one? Wasn't sure if this should go in cosmetic mods or here; I assumed this section would get more traffic...moderators, feel free to move if another section is better.

http://www.ft86club.com/forums/showp...35&postcount=6

Wait, wat?

If you get a flat, you don't want to put a spare donut tire on the drive wheels (the rears), only the fronts.

If one have full-size spare wheel it's also advisable to put it in front, as more then probable for it to have way different wear then those tires on car all the time.

Ah. Never really gave it any thought but that makes sense.

BRZyJ: Rationale being - on cars with limited slip diff on drive axle (including ours) different diameter wheels/tires will mean LSD working all the time, even when driving in straight line, to compensate different rotational speeds. Result = overheat / heavy wear, possibly even killing diff in not that long distances. Thus both in manual for ours (and for other cars with LSD, eg. FWD ones, but of course, regarding front axle then) it's mentioned to put different wheel (such as space saver) on dead axle, and move wheel from it to drive axle, if punctured tire happens to be there.
Actually if wheel and tire is of same size for full size spare, difference might not be that big, thus i might be overthinking things too much. I don't happen to have clear data of how big difference is "too big", and "how long one can drive in emergencies", so maybe being too cautious, wishing for everything in car to last longer. But f i have time, if it's not emergency, i'd probably try to put as similar as possible tires on drive axle. Full size spare one can be of different wear, different make, maybe even of different size (eg. - stock primacy, when you changed rest to some wider other tires) or underinflated by years unused, due forgetting to check it's pressures too). Front ones most probably will be more similar ones to punctured one. And it almost doesn't matter to have different sized wheels on dead axle or on car with driven axle with open diff (open = little to no friction / less heat generated), so even different wheels/tires can be safely be used there for long distances/several days.

More specifically, it's because of the Torsen-style diff we use. A clutch type LSD would be much more tolerant of a small variation in diameter for a short period of time, however the way a Torsen operates, any difference in rolling circumference would create a locked condition which really stresses the unit over any sort of extended distance, beyond what you'd see in just a corner, for example.

venturaII: same with clutch type diff. It works on different principle, but it will slip a bit => friction => heat, and here you get again overheat, degradation of oil, extra wear, failure. Think of driving for two hours with dragging brake. No time to cool off, just more and more heat buildup. Fluid long since boiled but you keep driving that way.
There is reason for diff cooling solutions to exist. Be those extra finned covers or even solutions with external rads. But constant dragging/heating for long time in my eyes seems even worse then race abuse.

The difference is that the clutch LSD has slip designed into it, whereas the Torsen is pretty much either locked or not. Driving for an extended period of time with the clutch LSD would still be a bad idea, but you'd run less chance of breaking something than with the Torsen. Would you rather replace a clutch pack or buy entirely new Torsen? I mean, neither is ideal, but I'd much rather just service the clutch LSD early.

Interesting. So unless you carry a jack stand around or want to assume the risk of potential damage, a space saver spare is next to useless in the event of a tire issue on a drive wheel.
:thumbdown:

Actually, you can get both tires on one side off the ground using the front jack point, but I've never tried it with the factory scissor jack...just a hydraulic floor jack. And even if the scissor jack would work, it's not something I'd want to do under the best of conditions, let alone on the side of the road at 2am, in the middle of January...

venturaII: whatever operating principle, there are such things as operating parameters outside designed in capabilities. Brakes are also designed to slip. You can cook them/damage rotors/pads/etc. Clutch is designed to slip. You can burn it by dragging too much/too long/or asking to handle too much torque. How clutch type diff would be any different, if you subject to permanent heating up to temps/heat build up it's not designed for?

For starters, how much slip do you think there will be in a clutch type LSD if there's only, say, 5% difference between rolling circumference? That small amount of slip is much easier to manage/tolerate than the accumulative effect of that same difference with a system that is effectively locked. The clutches are in an oil bath which adds a significant amount of thermal mass and cooling, and it's not like one side is spinning wildly while the other is stationary. Driving 10 miles on a clutch LSD with slightly mismatched tires would be like taking 20K miles off a system that would otherwise have gone 150K. And even if you burn up the clutches 100% (which you won't), you still have a functional open diff. A broken spur/worm gear in a Torsen takes 100% of the miles off it's life and leaves you on the side of the road (again).


Want proof of the durability of Eaton type diffs? Look at how many are still driving around the roads after 15, 20, 30 years, and are still functional.

Hm, yeah, so wtf are you supposed to do when you get a screw in the driver's side rear tire and you want to put the spare on the driver's side front and move the front to the rear?

Best answer: Call a flatbed tow truck?

Seems like it, lol :/
If you're "lucky" and it's something easy like a screw not near the edge it'd probably be less hassle to use a plug and 12 volt air compressor rather than mess with the spare...can always get it properly patched later. :iono:

edit: tried to check out the part number for the full size spare trunk liner and it doesn't look like like it's readily available in the US? Figures.

I checked at my local dealer and Toyota's US parts system doesn't recognize it as a good part number. There's some on ebay Australia, and they're relatively inexpensive (around US $120), but the shipping is almost double that. So, end of search, for me. :(

Bummer. I didn't know this existed and now I really want one, lol. I've got two old wheels and an almost new set of OEM tires collecting dust in the basement :/

I still think that from all three available alternatives, tire repair kit, spacesaver, full size spare, spacesaver is best compromise. With own flaws/cons/limitations, but overall - best compromise.

How often do you get flat/punctured tires guys? From my experience once .. per 2 years. So for that one day for two years long each day i'll drive around extra weight of full-size & have reduced volume of already small trunk. Slight, not that bad .. but are pros enough outweighting cons?
Tire repair kit? After use of which most probably shop will refuse to fix it, and very probably depending on tire wear at least two tires or maybe full set will need to be bought sooner? I've also heard that these kits are unable to fix some type of damages, so don't know if i'd ever want to rely on it.
So my vote still is for space-saver. One of first things i changed for this car after purchase from stock repair kit. I had used sapcesaver donuts in past and know i can rely on it and to what extent to rely. Yes, LSD diff adds some extra remounting work in half of cases where it's bad luck of puncturing rear, but i like that i can save a lot by bringing in tire shop punctured tire, with great chance have it fixed, and then not having to buy new tire replacements, but i still can use one fixed tire with wear like rest in set. And i can use full trunk volume with flat floor all the time.
P.S.
There is one big con to spacesaver though. Not for me using stockers, but for some here. Most probably it's brake clearance if one has BBK installed, will SUCK. Making it not an considerable option. Some AMG/brabus mercs or Porsche may make specific alloy spacesaver wheels to clear even their big brakes, but most donut options for 5x100 comes from subary/toyota/VW generic cars partbin, not designed with non-stock part support in mind. That may mean that unless with some spacers one has to bring along, they might not even been mountable front with BBK.

I may be mistaken but I think the cover is also for 16" wheels, not sure if it would work with our 17" wheels?

How often does your house catch fire? Mine never has, but I still keep a fire extinguisher, even though water runs freely from the faucet.

venturaII: space saver IS what fire extinguisher is for your house example. Full size spare sounds more like asking firefighter brigade to live next to you. And having to hear their sirens during night when they have to go to work somewhere. But surely, it will add more fire safety to your house then fire extinguisher. And sirens.

I consider the water that runs out of my faucets the space saver. Might work for a minor issue, but you're better off having a fire extinguisher. With a full size spare, I can pop it on, and continue on my trip and have the repair done at my convenience. It's easier to change because I only need to change the actual flat tire, not perform the front/rear tire shuffle, and I don't have any speed/distance restrictions. I do a fair amount of driving in areas where 50 miles of nothing, let alone a tire repair shop, is quite common.

Anyone ever find this floor in the US?