MAX Update No. 76: Wheels Are Turning

| 6/29/2011 1:57:32 AM


Now that MAX is getting streamlined, we can handle taller gearing, but we’ve pretty well gone through the inexpensive options for the differential gears, and we already have an overdrive transmission, so what’s to do? Easy — we go to larger diameter wheels and tires.

Larger than the 13” wheels that came with the Corrode Warrior (the ancient Toyota wagon that contributed so many of the driveline parts) or the 14” “snowflake” wheels (equally ancient) saved from a foundry scrap bin. It’s time for 15” wheels.

The problem is, as wheels get bigger they tend to get heavier, and suitable fifteen inchers aren’t cluttering up the scrap bins. Fortunately we still have some budget left, so I decided we’d invest $400, and if we had to, up to $500 on a set of wheels.

Wow, that’s five percent of the whole budget, but wheels are important, and as we’re closing in on our 100 mpg line-in-the-sand, these are the details we need to address. So I put out the word: I was looking for the best 15” wheels I could find, to fit MAX and MAX’s budget.

Man, I scoured the internet, and found the aptly named, which sells wheels too and plenty of them.  The customer service guy picked up on my concept of “best” quite quickly, and didn’t seem to think my goals were weird at all (in fact he found it an entertaining break from the norm); I wanted lightweight, narrow wheels, that wouldn’t look so modern or flashy that they’d throw off MAX’s classic racer look, and if possible I wanted dual stud patterns so I could try some high mileage tire tests on more conventional cars too (my Miata in particular). Oh yes, and they had to cost less that $125 apiece, $100 preferred.

john m_3
7/23/2011 4:59:41 PM

how many mpg are you getting now. i never hear the progressive mileage gains from these improvements. fess up, how many mpg are you getting now after the larger tires have been installed?

Abbey Bend
7/8/2011 2:18:52 PM

Propane injection increases the Cetane rating of the fuel. This in turn allows the injector timing to be further advanced, producing more power at a given RPM. With your engine choice, it is unlikely you would actually have any boost in power and even less likely you notice an increase in fuel economy. Propane is good for modern computer controled diesel engines, but largely worthless for non-computer engines. So save the money when it comes to propane!

Jack McCornack
7/5/2011 2:34:39 PM

Oh yes, Jeff, I'm quite willing to spend over ten grand on the R&D aspects, and indeed have. For example, if you build your own MAX (or I build another one), we'll only need one body for it, right? I've read mixed results from propane injection. It does indeed seem to reduce diesel fuel consumption, but I don't know if it actually saves any money, resources or emissions, since I'm having some difficulty finding out how much propane is being used...does it actually increase efficiency, or is it just trading one fuel for another? The two stud patterns are 4 x 4.5" (early Toyota etc) and 4 x 100mm (Miata etc).

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