Skyline A-lsd System

[paulr33]

Hi All,

I have been looking for any bits of various info on the A-LSD fitted on my r33 since day one but I never really found out much about it. I have changed the ECU to the Apexi PowerFC and I intermittently get A-LSD fail (known incompability with the powerfc) and it turns itself off leaving me in single spinner mode until i reboot the car. The car has the Vpsec diff with the finned cover and A-LSD and SLIP on the dash cluster. THe only info I have is that it piggybacks somehow off the ABS system (we think) to detect wheel speed to decide if loss of traction has occured.

Does anyone have any more info than just guesses on my behalf? Any diagrams, diagnostics, test, ideas would be great as I would like to learn more. How is the system turned on, what is turned on? can it be controlled by something else? can i override it and make it slip when i want? would there be a way to reboot it with the car running as its bloody annoying when it dies, you have to stop and power off the car and back on again to make it come online again.

There's an 8 page thread on the incompability of the A-LSD on the PowerFC if you would like to read up on what we've seen but its nothing more than ideas and other various bits of crap, nothing helpful or concrete

http://www.skylinesaustralia.com/forums/in...8464&hl=*a-lsd*

Hopefully someone has some more info, fialing that I could ask nissan if they have any info, the R33 service manual states that nissan can do A-LSD diag (with stock ecu) and that consult can check it, but it doesnt state what exactly or anything. I could take the car to nissan with the stock ECU in and get them to check it but would like to know more and possibly make it work a little better with the powerfc (manual override controls)

[paulr33]

just an update, after my recent motorkhana day and being stuck in single spinner mode the whole bloody time thanks to a-lsd failing all day i had a look at it today and found some more info

on the right hand side rear inside panel behind the wheel there are two hydraulic pumps and two plugs. one plug is red/brown and their other is white. the red/brown has two wires (red and black) and the white plug has 4 wires (blue, blue+orange, black, grey). if you unplug the white plug a-lsd fails instantly when the car starts up. this must be the main controller signal cable. the other plug i am not sure what it does but doesnt seem to have an effect on the system as i drove around with it unplugged and SLIP came on fine. i also noticed next to one of the pumps what looks to be a bleed nippel with its cap/cover missing so i may have lost all of the lsd fluid which could be why it doesnt always work. not entirely sure. im going to get the fluid changed over and try again.

here are some pics of the unit

[LBR33]

hmm....the alsd has always been a expensive option for the m spec gtst, was the alsd available on the gts too

[paulr33]

i dont believe it is availabile on the gts no turbo version but i could be wrong

[Links]

Hmm.. what to do.. that is the difficulty..

what are you trying to achieve.. make the A-LSD work with a Power FC or work out a seperate way of running it?..

the only thing I would suggest is possibly replaceing it with a mechanical one?? .. would be a waste though however may be your only option..

Short of rigging a stock ECU up purely for running the A-LSD.. do you have any other choices.. - i'm not even sure if you could do that..

[Moanie]

OH PLEASE NO!!!!

hahaha.. sorry.. i explored the option of replacing my alsd with a 1.5 or 2 way diff.... but decided against!! the alsd is ten times better!! There were even reviews in HPI etc

so yeah... fix don't replace!

[paulr33]

Hi All,

A fix has been found for issues with the A-LSD system and the Apexi PowerFC. For details check out http://www.skylinesaustralia.com/forums/in...pic=107656&st=0 on the correct fix. Basically the TPS signal needs to be sent to the A-LSD computer which the Apexi PowerFC (and presumably others) don't do

[NewKleer]

i think all the computers in the car that use consult operate on the same bus. if thats the case, then if you have time, see if u can measure resistance between those wires that didnt seem to affect anything when disconnected, between those and the wires in the consult plug - see if any are connected to each other (you might need a long wire to extend the reach of the multimeter). if they are then its possible to access it via consult

[Links]

Well done on resolving the issue.. i'm guessing ABS is still working correctly as well..

[paulr33]

well thats the funny thing, my abs worked fine despite it not having the TPS signal so go figure. now if i do a burnout for more than 20 seconds ABS and ALSD fail. A quick car reboot fixes this. I presume its some sort of failsafe mode after being in SLIP mode for more than 20 seconds. other than that it works awesome and SLIP's every time without failure

[ferni]

Wow i'm impressed, how did you figure it out?

[Moanie]

it was hidden somewhere in dave the mechanics dark mind!

[T04GTR]

i think all the computers in the car that use consult operate on the same bus. if thats the case, then if you have time, see if u can measure resistance between those wires that didnt seem to affect anything when disconnected, between those and the wires in the consult plug - see if any are connected to each other (you might need a long wire to extend the reach of the multimeter). if they are then its possible to access it via consult

just read the thread page 8

[T04GTR]

Wow i'm impressed, how did you figure it out?

i just used the workshop manuel. followd the nessesary test steps and bingo. fixed.

[NewKleer]

just read the thread page 8

which thread? the linked one didnt seem to mention anything close to what i said on page 8