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-   BRZ First-Gen (2012+) — General Topics (https://www.ft86club.com/forums/forumdisplay.php?f=23)
-   -   topspeed difference between manual transmission and automatic transmission (https://www.ft86club.com/forums/showthread.php?t=5553)

torquemada 04-30-2012 09:38 PM

topspeed difference between manual transmission and automatic transmission
 
I´m searching for some facts.
I´ve read that the topspeed with manual will be 230 kph, with automatic only 210 kph :(
Any confirmation :iono:

matt30 04-30-2012 10:03 PM

Well if the car is not electronically limited the auto should have a higher top speed.

Final drive ratio: 4.100
MT top gear: .767
AT top gear: .582
and wheel size of 24.8 inches

That's a limit of about 170mph for the manual and 200+ for the auto.

old greg 04-30-2012 10:08 PM

I seriously doubt it.

The auto has almost exactly the same gear ratios for 4th and 5th as the manual has for 5th and 6th, and it has the same final drive ratio so gearing isn't a factor. So for those numbers to be accurate, the auto would have to be putting 24% less power to the wheels than the manual (ie. not likely).

ayau 04-30-2012 10:10 PM

will the 200hp engine be enough to even push the car to those top speeds?

eikond 04-30-2012 10:17 PM

Quote:

Originally Posted by ayau (Post 196366)
will the 200hp engine be enough to even push the car to those top speeds?

No! Definitely not. No way this car could hit 170mph even though the drag coefficient is very good.

140 would most likely be top speed.

matt30 04-30-2012 10:25 PM

Yeah the car is definitely drag limited.

old greg 04-30-2012 10:29 PM

Quote:

Originally Posted by eikond (Post 196374)
No way this car could hit 170mph even though the drag coefficient is very good.

IDK about that. ;)

http://www.zillamag.com/wp-content/u...-4-490x250.png

blu_ 04-30-2012 10:30 PM

I bet mine will do 200+

torquemada 04-30-2012 10:32 PM

I´m talking about kilometer per hour, not miles per hour (don´t know what you guys are arguing about)

Dizz1e 04-30-2012 10:36 PM

Quote:

Originally Posted by torquemada (Post 196388)
I´m talking about kilometer per hour, not miles per hour (don´t know what you guys are arguing about)

130 to 140 mph = 209 to 225 kph

(*Just converting for ya, not saying this is the top speed of the BRZ*)

matt30 04-30-2012 10:41 PM

Quote:

Originally Posted by old greg (Post 196364)
I seriously doubt it.

The auto has almost exactly the same gear ratios for 4th and 5th as the manual has for 5th and 6th, and it has the same final drive ratio so gearing isn't a factor. So for those numbers to be accurate, the auto would have to be putting 24% less power to the wheels than the manual (ie. not likely).

Actually the gear ratios do matter. The car wont do above 130 in 5th gear in the MT and 4th gear in the auto. The .767 in the MT in 6th is producing 7%+ more torque than the auto with a gear ratio of .713 in 5th.

It will be higher in the rev range and presumably closer to peak torque.

Turbowned 04-30-2012 10:45 PM

It's definitely not a highway car, that's for sure.

matt30 04-30-2012 10:50 PM

Fun fact: a human's terminal velocity while skydiving is about 120-170mph depending on body position.

TheRipler 04-30-2012 11:23 PM

Quote:

Originally Posted by torquemada (Post 196340)
I´m searching for some facts.
I´ve read that the topspeed with manual will be 230 kph, with automatic only 210 kph :(
Any confirmation :iono:

Makes sense. Many manufacturers electronically limit the auto trans version to a lower speed. I know this has been true for at least some Subarus in the past.


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