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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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12-03-2014, 05:19 PM | #15 | |
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W=f*d Where f is Force and D is Distance. Where the wheel spin is the W. More teeth = less force but more distance traveled to produce the same amount of Work. To go the same speed, your engine needs to spin faster with a gear that has more teeth...... I really don't understand the confusion. Your wheels are not bolted on your crankshaft.....
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12-03-2014, 05:29 PM | #16 | |
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Its all miniscule though in retrospect. 4.1-4.667 = .567 .567/4.100= .138 so a 13.8% increase over stock. So every RPM you cruise at, add 13.8% to it. Im assuming subtract 13.8% from the normal MPG, given all conditions are the same.
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Last edited by cdrazic93; 12-03-2014 at 05:43 PM. |
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12-03-2014, 08:21 PM | #17 | |
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12-03-2014, 08:25 PM | #18 |
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Gear display on the dash can be out. I know it was with the 5.1. It can be fixed via a tune. Everything else is fine.
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12-03-2014, 08:27 PM | #19 |
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BTW, driving from California to the SCCA Nationals in NE with a full set of race tires and wheels in the car as well as tools, jacks, luggage, popup, etc...I got at least 30MPG on the highway at 70MPH on cruse control, supercharged with the 4.556 final drive.
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12-04-2014, 12:07 AM | #20 | |
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12-04-2014, 01:00 AM | #21 |
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I assume he meant that at a given speed, small wheels will be rotating faster, so it sounds like you're both on the same page.
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12-04-2014, 03:05 AM | #22 | |
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Totally makes sense, he was absolutely right.
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12-04-2014, 06:19 AM | #23 |
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i have a 4.56 i thought i would have affected my speedo but it didnt, still accurate to my gps. so im assuming speed isnt taken from the driveshaft. fuel econ isnt a noticeable difference, 6th gear at 70 is like a 600 rpm difference i think.
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12-04-2014, 05:30 PM | #24 |
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I have a 4.67. GPS is dead-on against the speedo at a +1MPH delta at 60MPH with stock tires at 32F/35R PSI (61MPH indicated / 60MPH GPS). That number didn't change with the FD, only after changing wheels/tires.
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12-05-2014, 04:51 AM | #25 |
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FWIW, there is a table for gear determination thresholds in the map; I'm assuming that's specifically dealing with the gear indicator on the dash for manual cars, because it doesn't seem to do anything on my A/T.
Theoretically you could just calculate the percent increase between your new final drive ratio and the stock 4.1, then increase the values by that percentage. Someone with a manual should test that out to see if it actually works that way. |
12-05-2014, 04:53 AM | #26 | |
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