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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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12-28-2015, 08:28 AM | #71 | |
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12-28-2015, 09:19 AM | #72 | |
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Not sure if I'm interpreting you correctly, but a shorter FD will not keep the revs higher. Gear spacing is the same - regardless of your FD, shift from 2-3 at redline will drop your revs to the same point in the rev band. FD will help you get through the torque dip a bit quicker though when starting from low RPMs. Our torque band is slightly stronger above the dip, but you're right it's pretty flat aside from the 'dip'. But you still have to get it above the torque dip and keep it there (5k and up). Are we talking about modded cars or stock? Yup a decently designed header will help greatly or eliminate the torque dip, effectively giving the car a much more useable torque curve - probably would benefit AT cars even more than MT cars. Sent from my iPhone using Tapatalk |
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12-28-2015, 11:02 AM | #73 | |
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12-28-2015, 11:29 AM | #74 |
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Hmmm that's really odd - your gear ratios determine the rpm spacing, not your FD. Maybe it's something weird with the 'play' in an automatic transmission. See attached image of spreadsheet calc to illustrate
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12-28-2015, 11:38 AM | #75 | |
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You're trying to use a gearing difference between two cars as a horsepower calculation. This is a gearing and mechanical advantage calculation, not horsepower. |
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12-28-2015, 12:07 PM | #76 |
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New FD is as old school mod as it gets, hot rodders do it all the time.
Want more acceleration, higher numerical ratio. Want more top end, lower numerical ratio. Its not that complicated.
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12-28-2015, 12:20 PM | #77 | |
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It is difficult to convince them. Many people will never get it, because they focus on the feeling. It is easier to feel acceleration, than to feel speed. They see that all gears accelerate stronger, so they believe that their car is overall faster. |
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12-28-2015, 12:26 PM | #78 | |
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You know what you're right it doesn't change. After 1st you sit at 5k rpms even with the 4.1. |
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12-28-2015, 12:29 PM | #79 |
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Yah and I totally get it - it's one of those more counter-intuitive things. Not trying to bash anyone over the head about it - in the end it doesn't really matter, as long as everybody's happy with the mods. As I mentioned before, I'm thinking upping my FD ratio too
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The Following User Says Thank You to bfrank1972 For This Useful Post: | nikitopo (12-28-2015) |
12-28-2015, 12:37 PM | #80 |
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I understand him and you. My point is there is more left on the table for the auto. I'm not arguing for the manual. The auto was intentionally screwed over because Toyota focused on MPG and the manual. If a manual FRS had a 3.3 FD it wouldn't be able to get to 60 in 6.3 seconds and 100 in 16.4, so therefore it would be much slower with a higher theoretical top speed. In the ND Miata the auto is .5 seconds slower because it's geared more economy.
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The Following User Says Thank You to SUB-FT86 For This Useful Post: | new2subaru (12-28-2015) |
12-28-2015, 01:20 PM | #81 | |
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12-28-2015, 06:39 PM | #82 |
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