[KCLe90]

Hello everybody, I'm looking for an answer to a problem I have. I have the Quaife LSD which has been in for quite a while and I also have many other mods in my car, including the JB4 running the latest firmware and the latest BMS backend flash (pump). My car used to lose traction with ease on my old Dinan stage 2 tune, but now I can't lose traction at all. Tried both settings to lose traction and multiple scenarios to get it to lose traction, but no success. I run 15 psi so the car shouldn't have a problem with losing traction. I tried to spin the rear end out, but the car would just understeer. I gunned the car in first and never lost traction. I need help identifying the issue, and any ideas for testing out the car would be helpful. Thanks.

[Silent9n54]

Originally Posted by KCLe90

Hello everybody, I'm looking for an answer to a problem I have. I have the Quaife LSD which has been in for quite a while and I also have many other mods in my car, including the JB4 running the latest firmware and the latest BMS backend flash (pump). My car used to lose traction with ease on my old Dinan stage 2 tune, but now I can't lose traction at all. Tried both settings to lose traction and multiple scenarios to get it to lose traction, but no success. I run 15 psi so the car shouldn't have a problem with losing traction. I tried to spin the rear end out, but the car would just understeer. I gunned the car in first and never lost traction. I need help identifying the issue, and any ideas for testing out the car would be helpful. Thanks.

well lsd helps with traction so you should be happy that you dont break loose. traction off ?? you are not supposed to break traction with dsc activated, thats what its for

did you code out your diff in inpa or protool ??? it could be that its interfering

with my lsd and mickey thompsons and 21.5 psi i cant break traction in 2nd on the street, it will just hook and go, so 15 psi is not much at all

[KCLe90]

Originally Posted by Silent11N54

well lsd helps with traction so you should be happy that you dont break loose. traction off ?? you are not supposed to break traction with dsc activated, thats what its for

did you code out your diff in inpa or protool ??? it could be that its interfering

with my lsd and mickey thompsons and 21.5 psi i cant break traction in 2nd on the street, it will just hook and go, so 15 psi is not much at all

The previous owner had a shop install the LSD, so I don't know. What I mean by DSC is everything deactivated. Both tires will spin no problem on dirt and gravel, even easier with the assists shut off. The rear tires are also very new so that could also play a part.

[nicky dj]

Just curious why you would want to break traction? I run a 20PSI MHD map and I can't hook for the life of me on takeoff, and with our cars can't do launch control. I'm actually jealous of your LSD etc. btw 15PSI may not be enough with the LSD.

[KCLe90]

Originally Posted by nicky dj

Just curious why you would want to break traction? I run a 20PSI MHD map and I can't hook for the life of me on takeoff, and with our cars can't do launch control. I'm actually jealous of your LSD etc. btw 15PSI may not be enough with the LSD.

It's sorta nice having it be able to just hook but it won't break traction when I need it/want it to. It used to on much lower power in similar conditions.

[Emilime75]

Originally Posted by KCLe90

The rear tires are also very new so that could also play a part.

Ya think?

Did you change brand/model/size when you got new tires? I know when I went from a 255 MPSS to a 275 PS4S, rear traction improved immensely.

[KCLe90]

Originally Posted by Emilime75

Ya think?

Did you change brand/model/size when you got new tires? I know when I went from a 255 MPSS to a 275 PS4S, rear traction improved immensely.

Same exact tires as before. Pilot sport A/S 3+ 265/35ZR18

[Silent9n54]

Originally Posted by nicky dj

Just curious why you would want to break traction? I run a 20PSI MHD map and I can't hook for the life of me on takeoff, and with our cars can't do launch control. I'm actually jealous of your LSD etc. btw 15PSI may not be enough with the LSD.

not sure if you are 6AT or 6MT but xhp just released a "launch control" option.. basically lowers the torque in first ...still gotta brake boost it, but i can finally launch in first and make it hook.

[nicky dj]

Originally Posted by Silent11N54

not sure if you are 6AT or 6MT but xhp just released a "launch control" option.. basically lowers the torque in first ...still gotta brake boost it, but i can finally launch in first and make it hook.

Wait what?? I have xHP. I'll look into that, thanks!

[Silent9n54]

Originally Posted by nicky dj

Wait what?? I have xHP. I'll look into that, thanks!

at 300tq in first it doesnt spin at all .... tried 400tq today and it did spin tires, but i didnt do a burnout or properly aired them out so its looking good for the track !!

[KCLe90]

Update: Pretty sure my torque converter is messed up now. Had something happen while shifting from 1st to 2nd, and now the car has a lot of trouble accelerating in any gear. ECU PSI and fuel pressures are regular, but the RPMS are a little shaky over 2100 rpm (specifically when accelerating). I feel like it was getting sort of worn down beforehand and the pull just gave way to the problem.