Is there any kind of a chart/graphic that can show you the speeds that the two transmissions will generally upshift/downshift at? (6 spd vs 8 speed) I realize its not going to be the same thing every time, but it would be interesting to look at if such a thing exists.

-Mike

 

The 6 speed won't shift into 6th until you're over 42 mph. That's the only bit of help I can give you.

 

Here ya go...

Below are ground speeds at 6,500 RPM engine redline for all 6 gears (RWD - A760E 6-Speed Automatic):
(*Speed limiter is electronically governed at 142 MPH preventing max speed of ~170 MPH • **Engine will not reach redline in 5th or 6th gear)

1st Gear:
Tire Size: 265/35 x 19" = 82.6" Circumference
Final Drive Gear: 3.615
1st Gear Ratio: 3.52
Engine RPM: 6500 Redline = 41.6970892440055 MPH (Up-Shift Engages 2nd Gear @ 3940 RPM)

2nd Gear:
Tire Size: 265/35 x 19" = 82.6" Circumference
Final Drive Gear: 3.615
2nd Gear Ratio: 2.043
Engine RPM: 6500 Redline = 71.84226830097863 MPH (Up-Shift Engages 3rd Gear @ 4650 RPM)

3rd Gear:
Tire Size: 265/35 x 19" = 82.6" Circumference
Final Drive Gear: 3.615
3rd Gear Ratio: 1.401
Engine RPM: 6500 Redline = 104.76356469585963 MPH (Up-Shift Engages 4th Gear @ 4845 RPM)

*4th Gear:
Tire Size: 265/35 x 19" = 82.6" Circumference
Final Drive Gear: 3.615
4th Gear Ratio: 1.000
Engine RPM: 6500 Redline = *146.77375413889936 MPH

**5th Gear:
Tire Size: 265/35 x 19" = 82.6" Circumference
Final Drive Gear: 3.615
5th Gear Ratio: 0.717
Engine RPM: 6500 Redline = **204.7053753680605 MPH

**6th Gear:
Tire Size: 265/35 x 19" = 82.6" Circumference
Final Drive Gear: 3.615
6th Gear Ratio: 0.586
Engine RPM: 6500 Redline = **250.46715723361663 MPH

6th Gear - 50% of Redline:
Engine RPM: 3250 = 125.23 MPH

Maximum Torque: 277 ft-lb @ 4,800 RPM
Maximum Horsepower: 306 SAE net @ 6,400 RPM


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Below are ground speeds at 6,500 RPM engine redline for all 8 gears (RWD - AA81E 8-Speed Automatic):
(Speed limiter is electronically governed at 142 MPH preventing max speed of ~170 MPH • **Engine will not reach redline in 6th, 7th or 8th gear)

1st Gear:
Tire Size: 265/35 x 19" = 82.6" Circumference
Final Drive Gear: 2.937
1st Gear Ratio: 4.596
Engine RPM: 6500 Redline = 37.66565457305995 MPH (Up-Shift Engages 2nd Gear @ 3855 RPM)

2nd Gear:
Tire Size: 265/35 x 19" = 82.6" Circumference
Final Drive Gear: 2.937
2nd Gear Ratio: 2.724
Engine RPM: 6500 Redline = 63.55042159243155 MPH (Up-Shift Engages 3rd Gear @ 4440 RPM)

3rd Gear:
Tire Size: 265/35 x 19" = 82.6" Circumference
Final Drive Gear: 2.937
3rd Gear Ratio: 1.863
Engine RPM: 6500 Redline = 92.92074525914309 MPH (Up-Shift Engages 4th Gear @ 5110 RPM)

4th Gear:
Tire Size: 265/35 x 19" = 82.6" Circumference
Final Drive Gear: 2.937
4th Gear Ratio: 1.464
Engine RPM: 6500 Redline = 118.24545656952431 MPH (Up-Shift Engages 5th Gear @ 5465 RPM)

5th Gear:
Tire Size: 265/35 x 19" = 82.6" Circumference
Final Drive Gear: 2.937
5th Gear Ratio: 1.231
Engine RPM: 6500 Redline = 140.62660310136764 MPH (Up-Shift Engages 6th Gear @ 5280 RPM)

**6th Gear:
Tire Size: 265/35 x 19" = 82.6" Circumference
Final Drive Gear: 2.937
6th Gear Ratio: 1.00
Engine RPM: 6500 Redline = **173.11134841778357 MPH

**7th Gear:
Tire Size: 265/35 x 19" = 82.6" Circumference
Final Drive Gear: 2.937
7th Gear Ratio: 0.824
Engine RPM: 6500 Redline = **210.0865878856597 MPH

**8th Gear:
Tire Size: 265/35 x 19" = 82.6" Circumference
Final Drive Gear: 2.937
8th Gear Ratio: 0.685
Engine RPM: 6500 Redline = **252.717296960268 MPH


8th Gear - 50% of Redline:
Engine RPM: 3250 = 126.35 MPH

Maximum Torque: 277 ft-lb @ 4,800 RPM
Maximum Horsepower: 306 SAE net @ 6,400 RPM

 

Interesting answer to a not so dumb question. Thanks for asking it.

 

 

Thanks, this is exactly the kind of thing I was looking for!

 

BC, where did you find this. You're the Google for ClubLexus lol.

 

Once you have the (1) Final Rear End Drive Gear and the (2) Transmission's Gear Ratios for each gear, the (3) Rear Tire's Circumference Size, and the (4) Engine's Redline shift point, then it is just an easy matter of calculating the numbers to obtain (A) the Ground Speed at Redline (or for any particular rpm desired) (B) for each gear. And, it is also easy to calculate what the rpm will be when the transmission (C) engages the next higher gear at upshifts.