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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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06-01-2012, 10:42 PM | #43 | |
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New diff: 5% improvement New mpg: 31.5 mile / gal Premium fuel cost: $4.00 / gal Base gas cost: $0.133 / mile New gas cost: $0.127 / mile Savings: $0.00635 / mile Payback mileage (miles to break even, every mile after is actual savings): 157.5 miles per $1 spent modifying the gear ratio. In other words, if you spend the $1106 mentioned earlier, it would take 174,195 miles before you broke even on the cost of the differential. And for a little sensitivity study... Payback mileage as premium fuel cost changes: $3.00 / gal : 210.0 miles per $1 spent modifying the gear ratio $3.50 / gal : 180.0 miles per $1 spent modifying the gear ratio $4.00 / gal : 157.5 miles per $1 spent modifying the gear ratio $4.50 / gal : 140.0 miles per $1 spent modifying the gear ratio $5.00 / gal : 126.6 miles per $1 spent modifying the gear ratio |
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06-01-2012, 11:02 PM | #44 | |
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06-03-2012, 07:01 AM | #45 |
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06-03-2012, 12:32 PM | #46 |
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Currently most A/T models get better mileage than their M/T equivalents. The computer has more control of what the transmission is doing and they are much more efficient than they used to be.
Jeff
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06-03-2012, 03:24 PM | #47 | |
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However, hypermilers all drive stick, even though the ratios are usually shorter |
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06-03-2012, 03:43 PM | #48 |
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Didn't bother reading thread, but has the OP considered how much acceleration will be impacted?
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06-04-2012, 12:51 AM | #49 | |
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I like the idea of a sixth gear that drops RPMs down to AT level and for the type of money we're talking about here (perhaps ~$1200 installed) then maybe waiting for a third party to come out with a different sixth gear is an option. Sure, install of a different sixth gear should be more expensive but the actual gear itself should be relatively reasonable (although that is a wild ass guess). |
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06-04-2012, 01:27 AM | #50 | |
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On ecomodder.com someone swapped their last gear and apparently it wasn't too bad to install, but it might be different on this transmission. That person's gear was I think made by taking 2nd gear from another transmission and flipping the cogs around to get a really low ratio, and since they had to TIG weld something on the gears I think the parts were weakened and so they failed after about 15k miles. |
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06-04-2012, 12:17 PM | #51 | |
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06-22-2012, 12:49 AM | #52 |
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Anyone source anything higher than 4.3? AutoFactory is using a 5.11.. That's what I'm after for the circuit.
Edit- nevermind.. Found it |
06-22-2012, 04:40 PM | #53 |
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The 6MT is geared quite low.....but the spacing between the gears, even overdrive 6th is actually quite tight..... for more relaxed cruising the AT rear end or the lexus rear end would drop rpms a bit, at a cost of acceleration down low..... My suggestion..buy the TOYOTA or Subaru part....literally the same part as Lexus, but without the premium price markup......assuming the lexus part is $1100, it wouldn't surprise me if the Scion part was 1/2 that.....
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06-22-2012, 04:47 PM | #54 | |
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I imagine getting a Lexus IS diff is the cheapest way to change final drive. Might be able to sell the 4.1 to some unhappy IS250 owners too lol. |
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06-22-2012, 05:41 PM | #55 | |
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I'd actually be most interested in what Subaru sells the diff for. Anyone have the Subaru part number for the LSD and complete pumpkin on a BRZ? Jeff
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06-23-2012, 05:20 AM | #56 | |
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