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Infiniti G35/37 X Awd

dontfeelcold
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dontfeelcold Experienced

dontfeelcold

Posted
Posted

Can anyone tell me or point me in the direction of some information about the G35/37 X awd systems, specifically about the electromagnetic clutch pack actuator?

Unless I am using the wrong words, nothing much is coming up.

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scotty nm35 Grand Master

scotty nm35

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An electromagnetic clutch has it's benefits, simplicity being one, but I like the hydraulic pack.

I am having transfer case slip atm, I was thinking of bumping the attessa pressure to compensate and hopefully help the clutches last longer in the next transfer case I fit. With electromagnetic you would have little control over clutch pressure, but it would be steady.

GTRPSI Mentor

GTRPSI

Posted
Posted

If your having transfer case slip Scotty you can sort it out with a new clutch pack arrangement (rearrange the order that the factory plates sit Mod) so it comes on firmer without slip.

Im getting another transfer case from Barry (birthday freebie) to mod mine, might be/should be enough plates left over to do another case.

Will show Barry how its done after i do mine so he can start offering the service. (If your too lazy to do it yourself)

scotty nm35 Grand Master

scotty nm35

Posted
Posted

I think it's just worn out Peter, I have another 5 here though. Perhaps that's a better option, although bumping the pressure on the hydraulics isn't hard either.

I assume you can fit more clutches by using thinner plates between, similar to auto transmissions? I will speak to you about it next time I get over to Edge mate.

scotty nm35 Grand Master

scotty nm35

Posted
Posted

the pressure switch on the hydraulic pack can be changed for a higher pressure hysteresis I think.

I have 5 Attessa units here to fix, all need pressure switches anyway. They switch off at 220psi stock afaik.

dontfeelcold Experienced

dontfeelcold

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  • Author
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With electromagnetic you would have little control over clutch pressure, but it would be steady.

I thought the electromagnetic units would be variable too. The current GTR uses one.

Anyone have a car with one? when my oscilloscope turns up we can find out :)

PN-Mad Grand Master

PN-Mad

Posted
Posted

They are variable.

From my understanding they apportion a set percentage up to 30km/h, then drop into rwd until slip is detected.

The snow button also locks a set percentage up to something like 60km/h along with throttle restrictions.

It's a fairly seemless system. You don't really feel it working, it just grips.

PN-Mad Grand Master

PN-Mad

Posted
Posted

Cause not many people know they exist, or know how to make one work....?

Mine has certainly has never had an issue, and I haven't read of any others either. It certainly doesn't have the issues associated with pumps, hydraulic actuators, etc.

dontfeelcold Experienced

dontfeelcold

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  • Author
Posted

I found the FSM for the G37, no reason why it shouldn't work.

The electromagnetic unit has a linear relationship between current flow and torque.

Reuse the factory skyline wiring, trick ecu into think everything is there. Drive the EM ets actuator via a solid state relay that can handle higher current if the hydro ecu can't handle 5amps (or possibly a bit more).

Factory G37 logic is cut the 4wd when the transfer case fluid gets over 80deg C. You could easily make use of the hydro ets reservoir low oil switch to warn you via the 4WD light that the oil is hot.

Then make the EM ets actuator fit in a gtr transfer case, thats the unkown.

Doable like anything, very tempting...

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