recklessOP Posted June 9, 2003 Report Share Posted June 9, 2003 drivetrain question for the 3S guys. i was looking into how the AWD system works on the 3S cars, and i haven't found any straight answers yet. here's my question... is power fed from the engine through the transmission and into the transfer case, and then sent to the front and rear differentials at all times? or is power fed full time to one end of the car, and only diverted to the other half when wheel spin is detected? can someone give me a straight answer, or point me somewhere that would answer my question. do NOT just post a link to 3si.org! tongue.gif i'm slow, pictures or diagrams would be helpful... redface.gif Quote Link to comment Share on other sites More sharing options...
recklessOP Posted June 9, 2003 Author Report Share Posted June 9, 2003 btw, do the EVOs and DSMs use a similar setup? just curious... Quote Link to comment Share on other sites More sharing options...
Guest Ranger_Man Posted June 10, 2003 Report Share Posted June 10, 2003 fairly sure that its engine -> transmission -> transfer case -> f/r diffs at all times. iirc the skyline has that active awd system that only kicks on with wheel spin. Quote Link to comment Share on other sites More sharing options...
recklessOP Posted June 10, 2003 Author Report Share Posted June 10, 2003 Originally posted by Idiot Savant: fairly sure that its engine -> transmission -> transfer case -> f/r diffs at all times. iirc the skyline has that active awd system that only kicks on with wheel spin. i think porsche is like that too. most AWD cars are. i was under the impression the 3S cars had a "true" full time AWD system... Quote Link to comment Share on other sites More sharing options...
smokinHawk1647545499 Posted June 10, 2003 Report Share Posted June 10, 2003 It does have true awd. i cant remember if it has a viscous coupling system that allows more power to be sent to the front wheels when traction is comprimised. I pretty sure though its not a 50/50 slipt maybe 40/60 but i cant remember exactly. Quote Link to comment Share on other sites More sharing options...
recklessOP Posted June 10, 2003 Author Report Share Posted June 10, 2003 it's a 45/55 front/rear split if i remember correctly. i'm pretty sure it has a viscous coupling in the transfer case... seeing as the engine is mounted transverse, and most of the 3S cars were FWD, i was thinking it might be full time FWD, sending power to the rear wheels only under low traction conditions like a lot of other production "AWD" cars. but from what i've been hearing, the car has a "true" AWD system, and power is fed to every wheel full time... anyone else wanna jump in..? smile.gif btw, any idea what the typical HP loss through the drivetrain is on these cars..? Quote Link to comment Share on other sites More sharing options...
Renner Posted June 10, 2003 Report Share Posted June 10, 2003 Here you go: http://www.stealth316.com/2-awd2.htm#Transaxle http://www.stealth316.com/2-awd3.htm#cdvcu These cars have been tested to have anywhere between 25%-30% driveline loss when tested on an engine dyno, and then on a split roller chassis dyno (where the rollers moved independently). That is the key point, because the viscous coupling is required to transmit max power for a split roller setup, and thus the car will have the max driveline loss in this case due to friction and gear loading. So basically when you are out doing a highway roll, you will not be losing the full 25-30% unless you have wheel spin, but how much you are losing has not been calculated or tested yet, I would assume it to be closer to 20-25% instead based on some results from other AWD systems. The 6-speeds hold up better to abuse then the 5-speeds. BTW, the AWD system in the Porsche 993TT will transmit 95% of the power to the rear wheels until slip is detected, and only adds a total of 93 pounds to the total vehicle weight. Quote Link to comment Share on other sites More sharing options...
Mr. Jones Posted June 10, 2003 Report Share Posted June 10, 2003 Originally posted by Renner: Here you go: http://www.stealth316.com/2-awd2.htm#Transaxle http://www.stealth316.com/2-awd3.htm#cdvcu These cars have been tested to have anywhere between 25%-30% driveline loss when tested on an engine dyno, and then on a split roller chassis dyno (where the rollers moved independently). That is the key point, because the viscous coupling is required to transmit max power for a split roller setup, and thus the car will have the max driveline loss in this case due to friction and gear loading. So basically when you are out doing a highway roll, you will not be losing the full 25-30% unless you have wheel spin, but how much you are losing has not been calculated or tested yet, I would assume it to be closer to 20-25% instead based on some results from other AWD systems. The 6-speeds hold up better to abuse then the 5-speeds. BTW, the AWD system in the Porsche 993TT will transmit 95% of the power to the rear wheels until slip is detected, and only adds a total of 93 pounds to the total vehicle weight. 93LBS Damn our AWD jalopy is like ~300lbs Damn Porsche Quote Link to comment Share on other sites More sharing options...
recklessOP Posted June 10, 2003 Author Report Share Posted June 10, 2003 Originally posted by Renner: BTW, the AWD system in the Porsche 993TT will transmit 95% of the power to the rear wheels until slip is detected, and only adds a total of 93 pounds to the total vehicle weight. yet another reason i want a 993 TT... redface.gif Quote Link to comment Share on other sites More sharing options...
recklessOP Posted June 11, 2003 Author Report Share Posted June 11, 2003 now i see... redface.gif the center diff/viscous coupling is inside the transaxle, along with the front diff... i bet those transaxles are fun to take apart... tongue.gif Quote Link to comment Share on other sites More sharing options...
Guest project3.4camaro Posted July 1, 2003 Report Share Posted July 1, 2003 I bet anyting on that car would be fun to work on. 3kgt VR4. AWD, All wheel steering, twin turbo 3.0 liter v6. transverse. Sounds like it be real fun to diagnose some odd vibration or alignment prob. ouch Quote Link to comment Share on other sites More sharing options...
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