markroemers Posted November 28, 2013 Report Share Posted November 28, 2013 Hi there, My Volvo XC90 V8 needs a new read diff. I will have it changed next week, but started to wonder about more mods for my Volvo. Has anyone tried to change it to a real permanent AWD system like the Audi Quattro? I want this because I want less understeer. Question 1: Would it be possible? I cannot find how the power from the front end it distributed to the rear. Is there another diff or is a basic 50/50 split and does the Haldex reduce the torque getting through to the rear wheels? IF there is a central diff, can I change it for a Torsen diff? Torsen is a mechanical torque distribution diff with no electronics. Regards Mark Link to comment Share on other sites More sharing options...
JRL Posted November 28, 2013 Report Share Posted November 28, 2013 Simple answer is no Link to comment Share on other sites More sharing options...
cupdriver91 Posted November 28, 2013 Report Share Posted November 28, 2013 The simple answer is no,but you can modify any car any way you want,the cost? Link to comment Share on other sites More sharing options...
burnout8488 Posted November 29, 2013 Report Share Posted November 29, 2013 It's an XC90, nobody would ever do that for a DD XC90. If it was a 240, then it might be worth discussing crazy mods since they'd be 99% easier and actually possible. The worst part of the Volvo AWD system on your car is the fact that it uses a splined collar to transfer power to the angle gear, not a transmission specifically designed to be AWD. It's basically a FWD transmission with some clever engineering to make it AWD, but it isn't the most rugged, and you wouldn't want it working 100% of the time in a 50/50 distribution setup. Link to comment Share on other sites More sharing options...
Piston Slapper Posted November 29, 2013 Report Share Posted November 29, 2013 You could, hypothetically, program it to keep the haldex locked up all the time. The question is, why would you want it to? For normal driving you want the rear to just be freewheeling. Link to comment Share on other sites More sharing options...
Che'_Moderator Posted November 29, 2013 Report Share Posted November 29, 2013 Audi and the rest use the same diff design. If you wanted something more mechanical, you would have to gut the diff and install a plate style system or something like that. Link to comment Share on other sites More sharing options...
Piston Slapper Posted November 29, 2013 Report Share Posted November 29, 2013 Yeah, current Audis also use haldex systems. I think he was referring to the old school mechanical quattros. Link to comment Share on other sites More sharing options...
Commander Riker Posted November 29, 2013 Report Share Posted November 29, 2013 I'm pretty sure if you did remove the haldex... the bevel gear and/or coupler wouldn't last very long. Link to comment Share on other sites More sharing options...
andyb5 Posted November 30, 2013 Report Share Posted November 30, 2013 Audis with a transverse engine (A/S3, TT, A4, etc) use a Haldex based system. Models with a longitudinal engine (S4, RS5, S6, etc) use a Torsen- based system that is very robust and capable of sending 80+% torque to any given end of the car. A number of P2 R guys have had great success welding the trans output collar to to the angle gear input shaft. This prevents the splines on the collar from stripping. The major downside to that method is a different (more expensive) component of the AWD system (angle gear or front diff) becomes the failure point and not the comparatively cheap collar. Link to comment Share on other sites More sharing options...
Commander Riker Posted November 30, 2013 Report Share Posted November 30, 2013 Audis with a transverse engine (A/S3, TT, A4, etc) use a Haldex based system. Models with a longitudinal engine (S4, RS5, S6, etc) use a Torsen- based system that is very robust and capable of sending 80+% torque to any given end of the car. A number of P2 R guys have had great success welding the trans output collar to to the angle gear input shaft. This prevents the splines on the collar from stripping. The major downside to that method is a different (more expensive) component of the AWD system (angle gear or front diff) becomes the failure point and not the comparatively cheap collar. Though it's unrelated to OP's question... couldn't red locktite be used for nearly the same effect? I wondered if I should have added anything to it when it had it apart a few years back. Link to comment Share on other sites More sharing options...
burnout8488 Posted December 1, 2013 Report Share Posted December 1, 2013 I used red loctite on mine once, completely slathered it in the stuff. When it came time to pull the collar, it was no easy task, even with a puller. Might not be a terrible idea. Link to comment Share on other sites More sharing options...
andyb5 Posted December 1, 2013 Report Share Posted December 1, 2013 Welding is much stronger, but in theory, the effect is similar to loctite. Link to comment Share on other sites More sharing options...
T5power Posted December 1, 2013 Report Share Posted December 1, 2013 Audis with a transverse engine (A/S3, TT, A4, etc) use a Haldex based system. Models with a longitudinal engine (S4, RS5, S6, etc) use a Torsen- based system that is very robust and capable of sending 80+% torque to any given end of the car. A number of P2 R guys have had great success welding the trans output collar to to the angle gear input shaft. This prevents the splines on the collar from stripping. The major downside to that method is a different (more expensive) component of the AWD system (angle gear or front diff) becomes the failure point and not the comparatively cheap collar. A4's are longitudinal. even with the FrontTrak, the A4's and A6's are longitudinal. TT'S and A3's are the only Haldex systems used. friendly correction Link to comment Share on other sites More sharing options...
DanielCamer Posted December 16, 2013 Report Share Posted December 16, 2013 Exactly. Why do you want to have to accelerate hard into every turn that you make? Permanent 4x4 mode will cost you more gas. You could, hypothetically, program it to keep the haldex locked up all the time. The question is, why would you want it to? For normal driving you want the rear to just be freewheeling. Link to comment Share on other sites More sharing options...
TIZIO AKA 1 HND MEC Posted December 17, 2013 Report Share Posted December 17, 2013 Exactly. Why do you want to have to accelerate hard into every turn that you make? Permanent 4x4 mode will cost you more gas. If he drives a V8 cost of gas is irrelevant I believe Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.