paulr33 Posted August 10, 2006 Author Share Posted August 10, 2006 got the car back. it feels the same. spins way too much for it to be locking. the light comes on so the puter i can only assume is doing what it is supposed to. i guess the next step is to work out the how pump gets power and try and hard lock it. Link to comment https://www.sau.com.au/forums/topic/128917-replacement-repair-of-vspec-diff/page/2/#findComment-2399654 Share on other sites More sharing options...
MANWHORE Posted August 10, 2006 Share Posted August 10, 2006 paul, as I said before, watching with eager eyes. Ps: 350 is a lot of money to just remove the diff. It's actually easy to remove the diff yourself. The difficult thing is changing the centre - that needs alignment. My friend got his centre changed for 150$ That switch sounds like the goods. Link to comment https://www.sau.com.au/forums/topic/128917-replacement-repair-of-vspec-diff/page/2/#findComment-2399769 Share on other sites More sharing options...
MANWHORE Posted August 10, 2006 Share Posted August 10, 2006 That's why I was asking you before about wwhat you thought of the performance of your diff. If I do a burnout, it will spin both wheels. although, one won't be spinning much, but it does spin. But just generally, like very quick twisty driving, the diff never locks. I doubt this is how it's meant to perform. I have a friedn with an r32 gtst with a brand new stock diff - was replaced under warranty. I'm 100% sure it's stock, because i saw the workshop open the parts, all in the nissan boxes and all. It actually feels quite tight. Obviously not clunk clunk chatter chatter as you go in a tight corner, but if you press the gas a bit more, you can feel it biting. Link to comment https://www.sau.com.au/forums/topic/128917-replacement-repair-of-vspec-diff/page/2/#findComment-2399775 Share on other sites More sharing options...
paulr33 Posted August 10, 2006 Author Share Posted August 10, 2006 yeah mine used to perform kick ass we've seen it lock solid for 30 seconds odd and leave a big darky on the street so i did lock hard as previously and it used to glide when going sideways as well so it did have the capacity to as well i think it could be a case of the pump is lacking oil pressure or strong pressure so it doesnt lock strong enough Link to comment https://www.sau.com.au/forums/topic/128917-replacement-repair-of-vspec-diff/page/2/#findComment-2399797 Share on other sites More sharing options...
paulr33 Posted August 10, 2006 Author Share Posted August 10, 2006 a bit of wind but you can see it smoking from both sides and it left double wheel'd darkies that was feb 2006 when i had just completed the wiring look hack to make it work with the powerfc it was the first time i actually had it not erorr (a-lsd come on normally) with the powerfc so i had to test it and it locked awsome Link to comment https://www.sau.com.au/forums/topic/128917-replacement-repair-of-vspec-diff/page/2/#findComment-2399813 Share on other sites More sharing options...
paulr33 Posted August 10, 2006 Author Share Posted August 10, 2006 the guy at northern differentials who opened it up said that the diff is at the mercy of the pump. it needs good pressure to make it lock. if the pump or puter doesnt do whats its supposed to, then it wont lock very hard he said. he was very surpirsed when he opened it up. he said its a very strange diff Link to comment https://www.sau.com.au/forums/topic/128917-replacement-repair-of-vspec-diff/page/2/#findComment-2399839 Share on other sites More sharing options...
paulr33 Posted August 11, 2006 Author Share Posted August 11, 2006 actually i am confused. maybe just pulling it out, flushing and cleaning it and putting it back has fixed it? the car seems to be really nice gliding when i bag it up and it seems to really swifting sliding when its lost traction. i did a bit of a curry run today on the street out the front of work and walked past it just before and its left two perfect darkies on the road. so its locking it seems ill need to do some more testing Link to comment https://www.sau.com.au/forums/topic/128917-replacement-repair-of-vspec-diff/page/2/#findComment-2401219 Share on other sites More sharing options...
paulr33 Posted August 12, 2006 Author Share Posted August 12, 2006 next step is to see what pressure is coming out of the pump when it locks ive also noticed greenline list all their aftermarket lsd's as not suitable for active lsd models NISMO GT LSD Pro 38420-RSS15-B5 / 38420-RSS20-B5 (Differentials) ¥101,640 Selective type. 1.5 or 2 way. Kit includes, LSD oil, side flange, oil seals, gasket ring gear bolts. Not suitable for use with vehicles fitted with active LSD. Link to comment https://www.sau.com.au/forums/topic/128917-replacement-repair-of-vspec-diff/page/2/#findComment-2403769 Share on other sites More sharing options...
paulr33 Posted August 12, 2006 Author Share Posted August 12, 2006 this is the tech view from nissan fast its listed as the torque split system i was looking for lsd and a-lsd Link to comment https://www.sau.com.au/forums/topic/128917-replacement-repair-of-vspec-diff/page/2/#findComment-2403793 Share on other sites More sharing options...
paulr33 Posted August 12, 2006 Author Share Posted August 12, 2006 another view of the pump system Link to comment https://www.sau.com.au/forums/topic/128917-replacement-repair-of-vspec-diff/page/2/#findComment-2403803 Share on other sites More sharing options...
paulr33 Posted August 12, 2006 Author Share Posted August 12, 2006 did some more fiddling today. we found the pump gets 12v at startup and then 4v at idle. we only saw this once and was unable to replicate it. we tried to watch voltage when the system went into slip but couldnt pick up any signal (not sure why). we ran a 12v off the battery directly via a relay switched from in the car and u can hear the pump come on and lock. it seemed to be heaps better and actually spin both wheels. but now im not so sure. the pump is making a wierd noise. tomrrow we'll pull apart the oil lines and see how the pressure is flowing around. maybe its too low. but the override switch is cool Link to comment https://www.sau.com.au/forums/topic/128917-replacement-repair-of-vspec-diff/page/2/#findComment-2404271 Share on other sites More sharing options...
paulr33 Posted August 12, 2006 Author Share Posted August 12, 2006 i think the next step is to lock it via the switch and then plonk it on a dyno to see what each wheel is doing i suspect the pump is ceased or not strong enough (really tired) Link to comment https://www.sau.com.au/forums/topic/128917-replacement-repair-of-vspec-diff/page/2/#findComment-2404354 Share on other sites More sharing options...
paulr33 Posted August 13, 2006 Author Share Posted August 13, 2006 completed the override button today. a proper button with led to indicate when on. its protected by a 30amp fuse and relay system so i can choose between computer controlled pump or manual run. i think the pump is preload system and isnt used when the car is actaully spinning. cos if i run it normally when the car isnt moving u can hear it come under pressure and load by the tone of it. you can see the lsd fluid level drop when the pump runs (right hand side of the boot). so it appears the pump is ok. i might do some testing later tonight when its dark. im going to pressurize it and then turn the pump off (well back to normal puter mode) and do a burnout and see how it goes. i think having the pump hard locked on whilst doing burnouts or "slipping" makes it worse. i think a hard pressurize before a burnout and then drop it to normal mode may yeidl the best results. will also try and plonk it on a dyno in the next day or so to see whats going on in the rear end Link to comment https://www.sau.com.au/forums/topic/128917-replacement-repair-of-vspec-diff/page/2/#findComment-2405626 Share on other sites More sharing options...
paulr33 Posted August 13, 2006 Author Share Posted August 13, 2006 ok did some testing on some private roads. 1) sideways come up to a corner in 2nd gear leave puter in normal mode turn the corner and boot it, lots of wheelspin and it carries on like usual slip comes on and it operates normally. 2) takeoff come up to a stand still. stop. turn on diff lock. take off lots of axle tramp and a bit of double wheelspin a big improvement for traction 3) rolling clutch dmp rolling. turn on diff lock. boot it. a little bit of wheelspin it feels to bring the car around a bit more and direct it properly 4) roundabout come into the roundabout turn on diff lock while rolling boot it. a bit of a double wheel spin and glide out of the roundabout so far a big improvement just not sure how safe it is for the pump or how long it will last like this (being hardset to 12v on demand) Link to comment https://www.sau.com.au/forums/topic/128917-replacement-repair-of-vspec-diff/page/2/#findComment-2406135 Share on other sites More sharing options...
paulr33 Posted August 14, 2006 Author Share Posted August 14, 2006 did another test today come up to an intersection turn on diff lock turn the corner in 2nd give it curry nice double wheel spin im going to look into getting the hydraulic fluid line for it braded so that it dosent rupture under pressure and also an oil pressure guage on it so it doesnt go bang from excess pressure Link to comment https://www.sau.com.au/forums/topic/128917-replacement-repair-of-vspec-diff/page/2/#findComment-2408404 Share on other sites More sharing options...
paulr33 Posted August 14, 2006 Author Share Posted August 14, 2006 ive noticed when the pump runs for more than 2 seconds and the computer doesnt expect it to run it failds. it must have a pressure sensor and its picking up pressure when it isnt expecting it and thus fails. hopefully i can work out an override relay switched for the pressure sensor Link to comment https://www.sau.com.au/forums/topic/128917-replacement-repair-of-vspec-diff/page/2/#findComment-2409102 Share on other sites More sharing options...
paulr33 Posted August 14, 2006 Author Share Posted August 14, 2006 have ordered a poor mans auto guage oil pressure guage with elec sender so i can monitor pressure in the diff im worried it might get mega high when its hard locked at 12v Link to comment https://www.sau.com.au/forums/topic/128917-replacement-repair-of-vspec-diff/page/2/#findComment-2409257 Share on other sites More sharing options...
paulr33 Posted August 14, 2006 Author Share Posted August 14, 2006 there is a pressure sensor switch attached to the side of the pump if it detects pressure it turns on a relay to the puter. the puter must check this in real time and fail if it see's pressure when its not in slip mode. so we'll be attached this pressure switch into a our relay loom so its ignored when i hard lock it, this will prevent the puter failing when driving normally. cos i have to reboot the car when a-lsd fails, just a bit annoying. Link to comment https://www.sau.com.au/forums/topic/128917-replacement-repair-of-vspec-diff/page/2/#findComment-2409692 Share on other sites More sharing options...
MANWHORE Posted August 14, 2006 Share Posted August 14, 2006 Far out mate. top work. Is that pic with the burnout your driveway? Man I wish I had one of those. Link to comment https://www.sau.com.au/forums/topic/128917-replacement-repair-of-vspec-diff/page/2/#findComment-2410010 Share on other sites More sharing options...
paulr33 Posted August 15, 2006 Author Share Posted August 15, 2006 will get onto taking out the pressure signal sensor so a-lsd doesnt fail when i run the pump manually Link to comment https://www.sau.com.au/forums/topic/128917-replacement-repair-of-vspec-diff/page/2/#findComment-2411195 Share on other sites More sharing options...
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