Cheap tcase for some one. Ask for postage to us tho!
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Apparently skylines utilise a system called attessa which may work for controlling the slippage. Anyone know bout it?
My next thought is to use an in car accelerometer wired into a time lapsed switch with dimming out feature. Ie if I put the car into first gear and give a little blip on the throttle and clutch the g meter will increase decrease the resistance thus increasing "lock", Then the harder I push the car the more it locks up. If then i am cruising along with no dramas it will in effect drop back to rwd.
I found this:
I imagine ill need a microprocessor and a variable resistored output device of some sort. Plus maybe a delay timer?
Do we have any electrical engineers who can advise how I might rig up a circuit like this? I would initially wire in a bulb inside the car and see how it reacts to accelerating/braking/cornering.Last edited by Turk; 03-04-2012, 02:14 PM.Comment
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It never drops to rwd - it will *always* be awd. The only question is if it will be an open diff or not.Comment
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Yes that was what I was trying to say :)Comment
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also, I really thing a model based on the speed difference of the front and rear wheels is ideal. that's pretty much exactly what a viscous coupling does mechanically.
the biggest problem with using an accelerometer is you really won't have good control over slip. lets say you're drag racing and you dump your clutch - for whatever reason, your front left wheel has twice as much traction as the other 3 wheels. all your torque will go out the wheels with less traction (spinning), and the traction wheel will be stationary. and since you won't be moving, the accelerometer won't register. your center diff won't lock and you'll effectively be stuck.
now, that's a bit of an extreme example (although possible!) - most likely *some* acceleration would be measured, but it will look like a peak when you release the clutch, and then drop off dramatically a couple hundred ms later. still, your center diff would go to full lock, then release to something like 50% right when you need it to stay locked. not good.
and there are definitely instances where you'll want it to lock under lighter acceleration. I'm assuming it rains in the UK as it does here - having the AWD always working makes the car way more fun to drive in the rain. :D
You've already got 4 wheel speed sensors (well, 3, but maybe you'd want to consider using an ix ABS computer). Why not take advantage of them? :) comparing the difference in wheel speed can't be that hard, and all you'd need to do was increase the lockup % (as a function of PWM duty cycle) as the % speed difference got larger.
anyway, you really have me thinking. I was going to make an adapter to use the 325ix transfercase with the 525ix transmission. but maybe it would be better to use a 525ix transfercase as well.. got any leads? wanna ship one to the USA for me? :DComment
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This is ideal, BUT, How do I get this to work?Originally posted by nando View Post
Obviously the car has the abs sensors, Which could potentially be used to feed a standalone tease management system. I don't think the electronics can be that complicated! Surely a microprocessor will suffice in calculating the relevant sums and giving an output.
Even if the tcase was permanently locked surely it would still drive ok as with an LSD front and rear diff controlling slip mechanically differences in wheel speeds will fall within the Slip tolerances?
Would the Tcase burn out if I had it on permanently on say 9v?Comment
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Sorry to use your thread to ask this question.
Is it possible to carry out an s62 swap into an e30 without having to hack into the DME?
I have the key, ews, dme, s62(with its harness) + tranny.
If i were to get an e39 main harness, electronic throttle by wire, antenna, cluster could i carry out the swap into the e30 (as for as electronics are concerned)?Comment
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no, you would need a fair bit more to even stand a chance. Including steering column, wheel speed sensors, can bus network, abs, dsc... The lot. Far less hassle to pay £1000 odd and have it all plug and play, sell the bit you would have used to offset the cost and save yourself headache.
But yes, start your own thread and I'm sure people will give feedback!Comment
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I think it really depends on two things:
-what *actually* happens with DSC disconnected from the DME (it definitely throws a code, but how is engine operation affected?).
-how much y ou care about emissions related codes (you can still retrieve codes, but since your check/MIL light would always be on, you'd likely want to remove the LED).
other than DSC, there's nothing really tied to the DME that you'd have to convert (all those extra sensors are only for DSC).Comment
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the issue is keeping the can bus networked to stop the case from falling into limp mode. You can get it to "run" with the dme, general module ews and clocks, but not as you'd want it!Comment
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the only 2 things that the DME directly communicates with over CAN are the cluster and DSC. the general module doesn't really talk to the DME (at least, the DME doesn't care about it).
EWS doesn't talk over CAN either, it's wired straight together.
anyway, I haven't found yet what exactly the DME does without DSC connected. Is it an error code, or does it run at a reduced torque output? if it's just an error code -fuckit. :DComment
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I found the controller I was writing to you about, well it wasnt exactly this one that I remembered it was a cheaper one but non the less this is an HKS controller, The attesa was found poor by japanes racers the system was a bit slow at times when you needed torque split to front drive, it would come in to late.. they used this controler while driving and manually increase the torque by 10 to 90 to an even 50-50 in their settings. By the way one of our abs sensor is to the ix tranny but in the skyline theirs one to the boost. Here"s a link since you are into computers.
This is for another controller for the r32 and earlier versions, the previous might be for the newer skyline rb35 not familiar with those but I know the r32 skyline used the electro magnetic coil clutch to control front and rear torque split. Iam just not sure how the later one's worked but here's a link to the r32 torque controller.
Like I was telling you about the 525ix T-case, the electromagnetic clutches tend to over heat thats why they are full time systems am just not sure if they were built to high tolerances but skyline do use them consistantly going rwd when they want to take advatage of rear only problem they have are axle spline breakage front drive whicjh they fixed that. Thats why Iam using strong built front axle with spline adapters which will with stand up to 1,000hp. I know mitsu-evo use their own controller and suburus guys as well I would have to ask them if they are having any t-case issues... hopefully not.Comment
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The first link is a bit slow to come on but give it time till the item comes on.
Secound doesnt come up try this link and or type on the website:
(GRID TS-Dancer 2 E-TS ATTESA Controller Skyline 4WD)
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You can't adjust torque split with the 525ix transfercase. All you can do is keep the front and rear wheel speed constant. The torque split is a constant 66/34, governed by the planetary gear set. The clutch is there to regulate front and rear wheel speed - it wants to keep them constant. The transfer of torque is a secondary effect.
And again, you can't go "RWD" with any BMW transfercase. It's always AWD. The only question is if it's open or locked.
Like a rear diff - it's always 50/50, but some are LSD and others are open. The 525ix transfer case is like being able to control the slip% with an electromagnetic clutch. When open it will tend to spin one side, but that's more due to mechanical leverage, nominally it's still 50/50 even with no LSD. An open rear diff never "one wheel drive", just like an open BMW transfer case is never RWD.Comment
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