24V AWD Swap Knowledge Base

[The Dark Side of Will]

The Quaife for a Z3 1.9 bolts into the E53 front diff.

A Quaife doesn't necessarily make them both turn the same speed... it just keeps the inside from lighting up.

[Eskie]

In a corner... maybe? Could average the left and right front wheel speeds and multiply by the diff ratio to get the front driveshaft speed.

Driving the stepper motor wouldn't be a big problem... just have to have a quad driver that can handle enough current.

My project is to drop an S62 into an E30 iX. The car will end up front heavy. I intend to use a Quaife front diff and open rear to get the car to turn. Applying enough torque to the front driveshaft to make that Quaife useful will be very important.

Which front diff housing are you planning on running? When you say quaife, your taking about a limited slip unit? With a LSD in the front you could get a pretty good wheel speed reading from one corner. I say this because with a LSD both front axles should be turning relatively the same speed, right? I guess other options would be to run a speed sensor off the front driveshaft probably.

Regardless an S62 awd e30 is going to be crazy. The heavy ass E39 that the engine is in is already nuts.


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[The Dark Side of Will]

In a corner... maybe? Could average the left and right front wheel speeds and multiply by the diff ratio to get the front driveshaft speed.

Driving the stepper motor wouldn't be a big problem... just have to have a quad driver that can handle enough current.

My project is to drop an S62 into an E30 iX. The car will end up front heavy. I intend to use a Quaife front diff and open rear to get the car to turn. Applying enough torque to the front driveshaft to make that Quaife useful will be very important.

[Eskie]

Could you use one of the front wheel speed sensors for front input?

As far as getting it to lock and unlock I could probably figure out how to drive it. I’ve driven stepper motors with an arduino before. I have a torn down ATC transfer case that I should start messing with. I could try to build a driver and mess with it on the bench.


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[The Dark Side of Will]

(which means input & front/rear output speed sensors, chassis G-meter, maybe some reading of engine torque)

Duh moment: input and rear output speed will always be the same. This could be substituted using the VSS from the rear diff with zero additional hardware in the car. One could probably use a sensor to read the teeth on the front output sprocket to get front output speed. But after that it would still need steering angle, chassis G's and probably something to do with engine load/torque output.

[The Dark Side of Will]

That would be really sweet. I'd probably experiment with and arduino to see what I could get going but before that I'd probably just have an on/off switch--unlocked/full lock.

It has to be an ardruino or similar because the clutch is controlled by a stepper motor. Even with just a "lock/unlock" switch, there would need to be some logic to step the motor in until it stopped, then stop trying to drive it... then step the motor back out until it was at the other end of its travel.

Nisse, I think, noted some type of European controller. I asked about its capabilities, and he said it was limited to "Locked" and "Unlocked".

[nomansland92]

Yeah, did you get a new planetary in that thing or what? ;)


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Lol yep it's all fixed, I need to work on getting some videos of a few pulls

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[Eskie]

Yeah, did you get a new planetary in that thing or what? ;)


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[nomansland92]

You're right. I just remembered he used the original ix transfercase in that build. Bummer.

For now......

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[nando]

You're right. I just remembered he used the original ix transfercase in that build. Bummer.

[Eskie]

I thought it was a controller for the DCT but maybe it was for the transfer case


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[nando]

doesn't somebody here already make a controller for the transfercase? The guy that has the M20 turbo/DCT ix has one.

[Eskie]

The ATC-700 looks great for drag racing. Just lock it up and drop the hammer! It's compact, light weight and is straight through from front to rear. It also bolts up to the S6S-53BZ.

However, if you're getting much more in-depth that that, it may take a good bit of tuning (which means input & front/rear output speed sensors, chassis G-meter, maybe some reading of engine torque) to get it to help the car out in corners. Once that's tuned, @$$uming the programmer compensates for clutch wear while keeping it in tune, it will wear the clutch pack and require maintenance on an unknown schedule vs
other potentially maintenance free options.

That would be really sweet. I'd probably experiment with and arduino to see what I could get going but before that I'd probably just have an on/off switch--unlocked/full lock.

[The Dark Side of Will]

The ATC-700 looks great for drag racing. Just lock it up and drop the hammer! It's compact, light weight and is straight through from front to rear. It also bolts up to the S6S-53BZ.

However, if you're getting much more in-depth that that, it may take a good bit of tuning (which means input & front/rear output speed sensors, chassis G-meter, maybe some reading of engine torque) to get it to help the car out in corners. Once that's tuned, @$$uming the programmer compensates for clutch wear while keeping it in tune, it will wear the clutch pack and require maintenance on an unknown schedule vs
other potentially maintenance free options.

[Eskie]

Sorry... I never followed up on this. I received the shaft and it looks... machinable? The spline size certainly is MUCH beefier than the spline size on the stock E30 unit.

I'm not sure what I'll do with it yet. I think the S6S-53BZ is a great option for a transmission, but it'll take some work. I'll have to add a crank sensor boss to the bellhousing to run the S62. I'll have to make a shift arm and shift rod/DSSR. I'm still up in the air about the T-case... whether that's a E30 A95, E34 A110, BW 4472, ATC-700... Or just call up Quaife and see what they say.

Maybe I'll go with an Atlas 4 speed.

My goal is to be able to run stuff that is relatively cheap to replace and can take a punishing. E30ix parts are getting hard to source and I want to be able to go to the drag strip or autocross without worrying about breaking something. Or at lease worry about breaking something that is super hard to find. I'd like to run a M50/M52 turbo with a manual trans like S6S-53BZ or even a dual clutch auto. A front diff from anything newer because they are plentiful and I really haven't seen any failures yet, even in heavy X5M's. The ATC-700 would be nice to run for a transfer case because they are easy to source and if you built a controller you could set the bias between RWD and AWD. That would be a great option for people that daily drive their ix's like I do.