Nagare
Well-Known Member
- Joined
- Feb 1, 2017
- Threads
- 58
- Messages
- 4,023
- Reaction score
- 2,226
- Location
- Ft Lauderdale
- Vehicle(s)
- 2017 Lightning Blue V6
- Vehicle Showcase
- 1
- Thread starter
- #1
Wondering if anybody here has experienced/heard anything about a "phantom" shift happening from 5th to 6th gear.
My car is a 2017 V6 Automatic, so 6 gears. I swapped in a 3.73 Torsen diff and am tuned, I have experienced this issue on tunes from different companies (MPT and AMR, both good for the V6) and with the Forscan gear line updated (to account for the different tire size and gear change from 3.15) or stock. The tuners are aware of the 3.73 gears and stock 3.15 so the tunes should be good too.
Regular driveability is great in gears 1-4 and also no issues in 5 or 6 until I want to go faster than 95ish or 3k RPMs (here's a vid of me at 100 @ 3k trying to downshift). I can ride 4th gear at full throttle until 120ish no problem, but once I go to 5th, it'll shift to 6th on it's own. I call this a phantom shift because the gear indicator will still show 5th until I actually paddle up again then it shows 6th and absolutely nothing changes. After the phantom shift, the RPMs drop significantly (from 5th at 105ish at 4k to "6th" at the same speed but around 3k - here's a vid showing that) and the car won't move out of it's own way really. edit » just want to add that based on what I've seen the transmission ratios for 4th to 6th are 1.14 - .87 - .69, based on that it is a gear shift for the 5-6 I'm describing because 3.2k with a .69 ratio is right under 104 and 4k with .87 is 106.
Anything below 95ish shifting works just fine, I can drop from 6th to 5th to 4th with no issues and go full throttle after that. Happens in D or S. Regular driving at any speed there isn't really any issue aside from some low speed clunking sometimes but I believe that is normal Torsen behavior.
Anybody have any ideas?
My car is a 2017 V6 Automatic, so 6 gears. I swapped in a 3.73 Torsen diff and am tuned, I have experienced this issue on tunes from different companies (MPT and AMR, both good for the V6) and with the Forscan gear line updated (to account for the different tire size and gear change from 3.15) or stock. The tuners are aware of the 3.73 gears and stock 3.15 so the tunes should be good too.
Regular driveability is great in gears 1-4 and also no issues in 5 or 6 until I want to go faster than 95ish or 3k RPMs (here's a vid of me at 100 @ 3k trying to downshift). I can ride 4th gear at full throttle until 120ish no problem, but once I go to 5th, it'll shift to 6th on it's own. I call this a phantom shift because the gear indicator will still show 5th until I actually paddle up again then it shows 6th and absolutely nothing changes. After the phantom shift, the RPMs drop significantly (from 5th at 105ish at 4k to "6th" at the same speed but around 3k - here's a vid showing that) and the car won't move out of it's own way really. edit » just want to add that based on what I've seen the transmission ratios for 4th to 6th are 1.14 - .87 - .69, based on that it is a gear shift for the 5-6 I'm describing because 3.2k with a .69 ratio is right under 104 and 4k with .87 is 106.
Anything below 95ish shifting works just fine, I can drop from 6th to 5th to 4th with no issues and go full throttle after that. Happens in D or S. Regular driving at any speed there isn't really any issue aside from some low speed clunking sometimes but I believe that is normal Torsen behavior.
Anybody have any ideas?
Sponsored
Last edited:
