8 Speed Vs 6 Speed
#2
#3
Rookie
Thread Starter
Join Date: Mar 2013
Location: Toronto
Posts: 53
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Reason I'm asking is because RWD is350 can't have ML audio, AWD is350 can get ML audio but no 8 speed. But I really want the RWD is350. the packaging stinks in canada
#5
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Check out this link: https://www.clublexus.com/forums/is-...nvince-me.html
One of the members on the forum has described the difference in details between 8-speed vs. 6-speed. I hope this helps.
One of the members on the forum has described the difference in details between 8-speed vs. 6-speed. I hope this helps.
#6
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Personally I have RWD/8 Speed/ML Audio but I live in FL so it's complete different scenario.
![Thumb Up](https://www.clublexus.com/forums/images/smilies/thumbsup.gif)
#7
Lexus Test Driver
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
For me, the reason is I prefer the 8-speed as I have been driving the 2IS 350 RWD with 6 speed for nearly 7 years. Time to change.
Trending Topics
#8
The pursuit of F
![](https://www.clublexus.com/forums/images/ranks/rank-smod2.gif)
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
In my opinion, the 8-speed is superior from a performance standpoint!
From the Youtube videos you clearly hear the difference between the 8-speed and 6-speed tranny. 8-speed revs and shifts a little quicker. The 8 speed almost sounds like a (fast shifting) manual when shifting - you hear the throttle disengaging for a split second, then throttle kicks in again - it's that good.
The 6-speed sounds more typical - smooth power during the shift - not as exciting in my opinion.
IS350:
IS350 F-Sport (listen to the shifting at 1:40 to 1:46 WOW!!) :
IS250 AWD (same 6-speed as the 350 AWD to give you an idea):
From the Youtube videos you clearly hear the difference between the 8-speed and 6-speed tranny. 8-speed revs and shifts a little quicker. The 8 speed almost sounds like a (fast shifting) manual when shifting - you hear the throttle disengaging for a split second, then throttle kicks in again - it's that good.
![Big Grin](https://www.clublexus.com/forums/images/smilies/biggrin.gif)
The 6-speed sounds more typical - smooth power during the shift - not as exciting in my opinion.
IS350:
IS350 F-Sport (listen to the shifting at 1:40 to 1:46 WOW!!) :
IS250 AWD (same 6-speed as the 350 AWD to give you an idea):
#10
Lexus Champion
Join Date: Feb 2006
Location: San Diego, CA
Posts: 2,553
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
The 8 speed is better in that it has shorter shift times and rev-matching on downshifts. (I don't believe the 6 speed does, at least it doesn't on my 2006 IS) I don't think the 2 additional ratios are helping all that much though.
#11
Lead Lap
iTrader: (1)
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
The 8-speed transmission (by Aisin)is the same one found on the ISF. It is designed to respond exactly to what the driver wants. No delay when shifting (after 15MPH) and predictable. It has all of the characteristics that a manual box so why is it better? First, It's faster than any human will ever be. To give you a reference point, the Aisin 8-speed can shift in 0.1 secs... Formula-1 vehicles shift in 0.05secs. I don't care who you are out there, you CANNOT shift in less than on second let alone come close to a tenth of it. Secondly, it only shifts when you want it to (when its in Manual Mode) and yes it mimic's clutch lockup (2nd thru 8th gear only) so the gas is there when you want it to be, not like when the old transmission felt like it.. Thirdly, it throttle blips downshifts matching engine and gear speed to avoid engine breaking.
Not "racing"? Not a problem. Eight gears (on auto mode) only means you can run at a lower RPM during those long drives up and down the 101 making this IS a bit more gas efficient. In fact, ZF has just announced that they will be releasing a 9-speed G-box fairly soon so it seems that the 8-speed is the least amount of gears you should have going forward. IMHO.
So faster when I want it to be, and more gas efficient when I want it to be? sounds like a win/win.
Good luck...
Not "racing"? Not a problem. Eight gears (on auto mode) only means you can run at a lower RPM during those long drives up and down the 101 making this IS a bit more gas efficient. In fact, ZF has just announced that they will be releasing a 9-speed G-box fairly soon so it seems that the 8-speed is the least amount of gears you should have going forward. IMHO.
So faster when I want it to be, and more gas efficient when I want it to be? sounds like a win/win.
Good luck...
#13
Lexus Test Driver
Join Date: Jul 2013
Location: NSW
Posts: 1,019
Likes: 0
Received 0 Likes
on
0 Posts
#14
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Yes, but the final gear ratio of a differential makes a significant difference in how aggressive the transmission behaves.
Does anyone know if Lexus has published the final gear ratio of the 3IS IS350 differential yet? The spec details on the Lexus website lack this information.
IF the 3IS 8-speed transmission has the same final gear ratio in its differential that the IS-F uses (2.93), then that would explain why the current 0-60 times in the new IS350 are not near the 4.9 - 5.1 times of the previous generation IS that uses only a 6-speed transmission (besides the 66lbs of extra weight and Turanza tires). This would also explain why those that have owned a 2IS IS350 and switched to a 3IS have said that the new gen doesn't "feel" like it accelerates as fast as the previous gen does when flooring it from a dead stop.
The differential ratio in the 2IS is very aggressive (4.09) and is highly suitable for drag strip style racing. Some IS-F owners have experimented with swapping out their IS-F differential (2.93 final ratio) for the IS350 differential (4.09 final ratio) and noticed a significant improvement in acceleration but it also results in a lower top end speed.
Here's the IS-F thread:
https://www.clublexus.com/forums/is-...s350-diff.html
Does anyone know if Lexus has published the final gear ratio of the 3IS IS350 differential yet? The spec details on the Lexus website lack this information.
IF the 3IS 8-speed transmission has the same final gear ratio in its differential that the IS-F uses (2.93), then that would explain why the current 0-60 times in the new IS350 are not near the 4.9 - 5.1 times of the previous generation IS that uses only a 6-speed transmission (besides the 66lbs of extra weight and Turanza tires). This would also explain why those that have owned a 2IS IS350 and switched to a 3IS have said that the new gen doesn't "feel" like it accelerates as fast as the previous gen does when flooring it from a dead stop.
The differential ratio in the 2IS is very aggressive (4.09) and is highly suitable for drag strip style racing. Some IS-F owners have experimented with swapping out their IS-F differential (2.93 final ratio) for the IS350 differential (4.09 final ratio) and noticed a significant improvement in acceleration but it also results in a lower top end speed.
Here's the IS-F thread:
https://www.clublexus.com/forums/is-...s350-diff.html
Last edited by redspencer; 07-25-13 at 06:48 AM.