2017 diff swap

[ermax]

Originally Posted by nikitopo

You are missing an important point. With a lower final drive you can use a lower gear and you have more power.


Example:
My car can reach 225km/h on 5th gear. If I swap to a 4.55 final drive, then I'll need 6th gear to reach the same speed. Even with the changed ratio, the 6th gear will provide less torque comparing to 5th gear.


So, it depends in which gear the car could achieve the top speed. Was it on 5th gear? Then, you don't have a higher top speed with the changed final drive ratio. Was it on 6th gear and you didn't hit redline? Then, yes chances are that you 'll have a higher top speed.

I understand your argument. But it would only really be a problem if 6th gear was also swapped for a super tall gear causing RPMs to drop way bellow the power band causing it to not have enough power to pull 6th back into the power band. But we are only talking about the final drive. RPM drop between gears wouldn’t be any different between a 4.1 and 4.3.

Recalling from memory the 4.1 runs about 130 at redline in 5th. The 4.3 would drop that to about 127. If your car has enough power to overcome the drag at 130 in 6th (which it does) then what makes you think the same car with a 4.3 wouldn’t be able to overcome the drag at 127? Especially considering it would have the extra mechanical advantage of the 4.3 rear.

[ermax]

Originally Posted by Tcoat

95 MPH = 154 KPH

65 MPH = 104 KPH



If he wrote a ticket for 95 in a 65 he would HAVE to impound you car since it is greater than 40KPK over the speed limit. No matter how nice he was he would have no choice.

Different laws here in the states. I remember when I first got my license I got a ticket at 113mph in a 45mph zone. He knocked it down to 95 and I drove away.

[Tcoat]

Originally Posted by ermax

Different laws here in the states. I remember when I first got my license I got a ticket at 113mph in a 45mph zone. He knocked it down to 95 and I drove away.

They can knock it down but his math doesn't work. If he was given a ticket for the 95 mph (154KPH) as claimed the cop would have to impound the car. The cop can't register a ticket issued for 40KPH over the speed limit without issuing a "stunt driving" charge. The cop would have to knock it down to a max of 84 mph to avoid the larger charges.

[ermax]

Originally Posted by Tcoat

They can knock it down but his math doesn't work. If he was given a ticket for the 95 mph (154KPH) as claimed the cop would have to impound the car. The cop can't register a ticket issued for 40KPH over the speed limit without issuing a "stunt driving" charge. The cop would have to knock it down to a max of 84 mph to avoid the larger charges.

But you are in Canada are you not? The laws are different in the US and it varies from state to state.

[Tcoat]

Originally Posted by ermax

But you are in Canada are you not? The laws are different in the US and it varies from state to state.

Yes I am. I get that the laws are different. For some reason I thought he was in Canada.
He is excused.

[Tokay444]

Originally Posted by Tcoat

They can knock it down but his math doesn't work. If he was given a ticket for the 95 mph (154KPH) as claimed the cop would have to impound the car. The cop can't register a ticket issued for 40KPH over the speed limit without issuing a "stunt driving" charge. The cop would have to knock it down to a max of 84 mph to avoid the larger charges.

I got a ticket for 49km/h over in Cornwall. No stunt driving.

[ermax]

Originally Posted by Tcoat

Yes I am. I get that the laws are different. For some reason I thought he was in Canada.
He is excused.

He was using MPH and his profile said USA. I didn’t realize he was in Canada.

[Tcoat]

Originally Posted by Tokay444

I got a ticket for 49km/h over in Cornwall. No stunt driving.

The cop would have some explaining to do. They are mandated to automatically give the stunt driving charge to anything over 40. It is supposed to be outside of their discretionary abilities.

[Tcoat]

He isn't. I was confused. It happens once in a while.

[Somerandom18]

In Ohio where I living over 30 is impound speed. He put me right at the limit.

Sent from my Pixel XL using Tapatalk

[ZDan]

Changing diff gearing is IMO overrated. Power/weight is unchanged, overall performance largely unchanged. You will see modest improvements in 0-60 time, but acceleration from a given speed will either be modestly better or significantly worse if you have to be in a taller gear. At the track, it totally depends on how fast critical corners are. 4.3 could be better or could be worse vs. 4.1.

Also, the difference between 4.1 and 4.3 is so minor there's no way it's worth the effort anyway.

https://www.caranddriver.com/reviews...al-test-review
Predictably, a 5-hp gain and marginally shorter gearing do little to improve measured performance. Our 2017 test car hit 60 mph in 6.2 seconds and covered the quarter-mile in 14.8 seconds—improvements of 0.1 second across the board relative to the last manual BRZ we tested, a 2016 model. Trap speed remained the same at 95 mph.

[Tokay444]

Originally Posted by Tcoat

The cop would have some explaining to do. They are mandated to automatically give the stunt driving charge to anything over 40. It is supposed to be outside of their discretionary abilities.

You're thinking of 50 over...

[Cole]

Originally Posted by Tcoat

The cop would have some explaining to do. They are mandated to automatically give the stunt driving charge to anything over 40. It is supposed to be outside of their discretionary abilities.

Quite vehement in the defence of your reasoning while being wrong.

[Tcoat]

Originally Posted by Cole

Quite vehement in the defence of your reasoning while being wrong.

Meh. I can be wrong once in a while. I can live with it. No idea why I was thinking Some was Canadian.