Hussydabomb Member 81 Member For: 9y 4m 2d Posted 13/01/16 02:23 PM Share Posted 13/01/16 02:23 PM Hey guys I've converted my BA XR6 turbo form a 4 speed to a 6 speed manual and it goes great mid range 3,500rpm to high making 300rwkw.It feels VERY sluggish down low before boost hits not because of a mechanical problem or anything like that it just seams not as responsive or jumpy off the line and I'm thinking this could be dew to the STOCK BA 4 speed turbo diff gears being a 3.45 and the 6 speed being a 3.73.It wheel spins like a boss off the line or bogs down can not find an in-between (may be dew to my driving but still feels like the car is asleep down low in normal driving)Thoughts on diff gears to waken the thing up a bit or any other ideas?I've read the other threads but nothing really specific to my situation. Link to comment Share on other sites More sharing options...
arronm Dropping a turd Gold Donating Members 9,520 Member For: 16y 5m 29d Gender: Male Location: Perth Posted 13/01/16 02:45 PM Share Posted 13/01/16 02:45 PM 3.45 I think is stock on xr6 with six speed. 3.73 is FPV Link to comment Share on other sites More sharing options...
Hussydabomb Member 81 Member For: 9y 4m 2d Posted 13/01/16 02:53 PM Author Share Posted 13/01/16 02:53 PM My mistake then, I must have 3.23 ratio. And that makes it even more sluggish down low than the 3.45 haha Thoughts? Sent from my SM-G900I using Tapatalk Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 18y 7m 1d Gender: Male Location: Perth Posted 13/01/16 02:56 PM Share Posted 13/01/16 02:56 PM Both are 3.73 stock. If you go lower you'll get more wheel spin when it comes on boost but it will be larger coming on. Got higher and you place more load on the driveline so it will build boost quicker but may result in wheel spin. 3.73 is the best compromise, that and working on your driving style. 1 Link to comment Share on other sites More sharing options...
Hussydabomb Member 81 Member For: 9y 4m 2d Posted 13/01/16 02:59 PM Author Share Posted 13/01/16 02:59 PM Both are 3.73 stock.If you go lower you'll get more wheel spin when it comes on boost but it will be larger coming on.Got higher and you place more load on the driveline so it will build boost quicker but may result in wheel spin.3.73 is the best compromise, that and working on your driving style.thanks, ill put some more effort in my footwork and see how I go Link to comment Share on other sites More sharing options...
velocityxr6t Member 122 Member For: 15y 5m 12d Gender: Male Posted 13/01/16 03:33 PM Share Posted 13/01/16 03:33 PM 4 speed auto ba xr6 turbo is 3.45. Six speed manual is 3.73. Link to comment Share on other sites More sharing options...
sixman Donating Members 593 Member For: 19y 9m 2d Gender: Male Location: Hills District, NSW Posted 13/01/16 11:43 PM Share Posted 13/01/16 11:43 PM Anyone try 4.11 - does it work with the turbo engine or would it limit boost build up? Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 18y 7m 1d Gender: Male Location: Perth Posted 14/01/16 12:27 AM Share Posted 14/01/16 12:27 AM 4.09 is the closet you'll get in the gear sets for these diffs (although most sell these as 4.11) I had them in my old ute. After swapping out the 4spd Auto for a T56 the 3.43 was waaaaaaaaay to tall. Could do 80+kph in first. I changed the ratios to 4.09. Was laggier off the line than the 3.43 and would light the tires once it came on. Roll's at speed where fantastic though. A touch of brake to load it up and off she would go.IMHO 3.73 is the spot on ratio for the T56. Especially if you can find a T56 from an F6/GT that has the closer 2/3/4 ratios. 2 Link to comment Share on other sites More sharing options...
bamk2f6tornado Bronze Donating Members 777 Member For: 10y 4m 21d Gender: Male Location: Rockhampton Qld Posted 14/01/16 12:41 AM Share Posted 14/01/16 12:41 AM I noticed no difference swapping to 4.11's from the 3.73's. I did order 3.73's when I rebuilt my diff, they sent the wrong ones but I honestly can't tell the difference Link to comment Share on other sites More sharing options...
Hussydabomb Member 81 Member For: 9y 4m 2d Posted 14/01/16 04:50 AM Author Share Posted 14/01/16 04:50 AM 4.09 is the closet you'll get in the gear sets for these diffs (although most sell these as 4.11) I had them in my old ute. After swapping out the 4spd Auto for a T56 the 3.43 was waaaaaaaaay to tall. Could do 80+kph in first. I changed the ratios to 4.09. Was laggier off the line than the 3.43 and would light the tires once it came on. Roll's at speed where fantastic though. A touch of brake to load it up and off she would go.IMHO 3.73 is the spot on ratio for the T56. Especially if you can find a T56 from an F6/GT that has the closer 2/3/4 ratios.I'll look into getting 3.73's thrown in Sent from my SM-G900I using Tapatalk Link to comment Share on other sites More sharing options...
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