Space saver spare |
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Space saver spare |
Montreal914 |
Aug 8 2020, 12:28 AM
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#1
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Senior Member Group: Members Posts: 1,684 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California |
In the quest of increasing the space in my front trunk to integrate an oil cooler, I came across this piece of information that I thought was worth sharing.
Mercedes has been using Vredestein Space Master 165-15 collapsible spares on their smaller models like the C230 and the SLK. After looking at the pictures and comparing them to my 911 space saver on steel wheel, I think they are the exact same tires. The difference is that it is mounted on a 4.5" alloy wheel, not 5.5" like the Porsche. So, one though to gain trunk space would be to mount the space saver tire on a ~$100 4.5" Fachs from cip1. Lighter and narrower wheel, win win. The goal would still to have it laying flat for impact absorption, yet probably allowing a lower trunk floor and giving room for the front mounted cooler to vent out. Now the challenge is finding a place that will want to remove the collapsible Space Master tire and mount it on the Fachs... (IMG:style_emoticons/default/dry.gif) Below is the MBZ space saver wheel/tire. |
Montreal914 |
Aug 8 2020, 04:28 PM
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#2
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Senior Member Group: Members Posts: 1,684 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California |
Right! And i believe some later 911 also have alloy 15x5.5 with collapsible but not sure. Looking at the 4.5" Fachs, the offset makes the wheel center protrude a fair amount outward going against my goal of thinning the wheel... (IMG:style_emoticons/default/dry.gif)
So my current 3 options are: 1- 986/996 spare: 3.5",light, full diameter, inflated. Below is a mockup with a Mesa style cooler with a fan on top. The trunk floor is lower that the stock one. (IMG:style_emoticons/default/smile.gif) To achieve that, I would need to cut a ~9x9" opening in the floor though... (IMG:style_emoticons/default/sad.gif) Inlet would be front plugs. 2- 911 or alloy collapsible: 5.5", heavier than 986/996, small diameter, requires compressor. (IMG:style_emoticons/default/dry.gif) Below is the mockup using a Mercedes Diesel oil cooler, the narrower one, which fits under the arched shelf. This doesn't require any body cutting, just remove front 5 plugs and 2 rear access ports. As for area, 5 ports = 11.1 sq.in., and 2 outlet opening = 25.1 sq.in., so Ratio is good! (IMG:style_emoticons/default/smile.gif) The trunk floor is pretty much at the same position as the stock setup or even a little lower or without angle. 3- Fachs 4.5" with temporary donut (125/70-15): 4.5" anrrower than 5.5" (but center protruding), light, OD 22", inflated. Unfortunately, I don't have the wheel setup to validate this option but I think either cooler configuration could be used but there probably wouldn't be any gain in trunk space vs. option2. So, at the moment for more of a "bolt on" setup, I am leaning towards the collapsible option but I definetly need to either find an alloy collapsible spare, or find someone that can swap the tire, which as mentioned earlier, can be very difficult... (IMG:style_emoticons/default/headbang.gif) All of these options will require a custom trunk floor that would seal all around to create a plenum. Air path would be pretty turbulent compared to the beautiful work below but that would be my first step. @Mark Henry : This is McMark's setup! (IMG:style_emoticons/default/pray.gif) And this is the integration done in PMB's recent build (IMG:style_emoticons/default/pray.gif) |
drem914 |
Aug 9 2020, 12:19 PM
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#3
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Senior Member Group: Members Posts: 1,042 Joined: 16-May 08 From: Trabuco Canyon, CA Member No.: 9,062 Region Association: Southern California |
Beautiful setup |
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