zheka130

Hey guys, curious what you think about the transmission settings in the GS (my experience is with the 6 speed only).
Even when driving at 50km/h, if you hit the paddle shifter, it downshifts to the 5th gear; therefore in auto mode it selects the highest gear.

I could understand this, if the car was in ECO mode, in Sport + you'd expect a very aggressive set up. I presume fuel economy was their goal.
I wonder if the same set up exists on the 8 speed ?

bclexus

It makes no difference which drive mode, including ECO, is selected, the transmission and engine will perform the same at WOT. Also, at WOT the transmission upshifts are not affected by using Manual/Paddle shifting as the transmission will automatically upshift to each higher gear at redline (see my information below) until the speed limiter is triggered. In other words, at a drag strip for example you can be in ECO mode and Drive, and it will be exactly the same results as S+ and Manual. Just stomp it and don't let up! It'll upshift in Manual for you automatically. And, of course you cannot over-rev the engine either. It's all setup to be foolproof...

Below are ground speeds at 6,500 RPM engine redline for all 6 gears (2013 - 2014) RWD - A760E 6-Speed Automatic:
(*Speed limiter is electronically governed at 142 MPH preventing a higher maximum speed. • **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

jgscott

iTrader: (1)

Is the GS350 the 2013 with 6 speed? Or 2014+ with the 8 speed Trans?

signdetres

2013 GS350 RWD = 6 speed
2013-2020 GS350 AWD = 6 speed

2014-2020 RWD = 8 speed

jgscott

iTrader: (1)

Yes I am quite aware. Do you know what year and model the op thread starter has?

zheka130

Thanks for the info bclexus.
I have the 6 speed A760E transmission.
What I meant by the original post was that I would expect the car to hold higher RPMs in every gear in Sport mode, instead it always finds the high gear and then downshifts, which is pretty slow to occur.

bclexus

Your post is a bit confusing, unless you are saying this happens at some degree of heavy throttle but just not at WOT, which in that case I understand.

At WOT the transmission will only upshift and that happens only at redline. The only time it will downshift while still accelerating is when less than WOT is used, such as with just light or medium throttle and typically coming up on the threshold of just coasting...or when literally lifting off throttle. In Sport and Sport+ modes it will indeed hold gears longer but once that threshold between acceleration and coasting comes about it will upshift (as is expected), but if then some degree of throttle is soon applied after the upshift it will downshift to provide an increase in acceleration. Oftentimes a driver's right foot can give mixed or confusing input when applying minimal amounts of pressure adjustments to the gas pedal.

signdetres

I don't know what year but he said it's a 6-speed in the original post so it's either a 2013 RWD or a 2013-2020 AWD.