50/50 haldex mod

Haha, yep, I had exactly the same thought and was looking for another transverse set-up that might use a true center diff. I haven't found one yet :(

Evo - I could only find info on a couple of models, but they seem to be similar to haldex but with the hydraulic pressure fully computer controlled
Celica GT4 - Viscous coupling
Volvo 850 - Viscous coupling
Newer Volvos - Haldex
etc..

There's some I've not checked yet though, Pulsar GTiR, Mazda 626 etc..
 
Thanks for the explaination Robin.

I had it in my mind that the torsen sat on the prop shaft and tightened up as more torque was delivered. Just watched some youtube videos and now I can see the light!

So its back to "A4 quattro rear diff in an S3" idea.
More inspectigating is needed when I go to the scrapyard.

This is why I thought the torsen was on the shaft - looks that way in this picture

Quattro torsen differential operating principlex1024x768

Audi all wheel drive explained | awd cars, 4x4 vehicles, 4wd trucks, 4motion, quattro, xDrive, SH-AWD, Haldex, Torsen, wiki - How it works


So all we need is an "acceleration device" from a honda :)

Honda SH AWD Technical - YouTube



 
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rhys1210 said:
The rears only hope if you moving slowly. Like parking.

I've never had mine hope under normal driving and cornering, only slow manoeuvres.

My haldex is locked 50:50 all the time even under braking.
Click to expand...

you should say you only notice it hopping at low speeds... they will still be doing it at higher speeds clearly..
 
audi upgrades
In theory they should never hop as it should be an open diff.

But for some reason they do. But yes you are right it will hop at higher speeds but you don't notice it.
 
I've made the insert and will send it to anyone that wants to review it, Its the one with the circlip so please make sure you have that one.

I'm making a adjustable one that Gops will try
 
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Is that the threaded one or the circlip I'm trying? Or am I banging on the controller I sent over?
 
Ooo! I like this thread.. Every time I look at it, something new happens lol! And I'm testing! Perfect actually as I drive the car EVERYday forth and back. I might try and go on the jungle track at work and test the haldex!
 
superkarl said:
i cant believe with all the computer/software geeks in the world, these things havent been hacked or reprogrammed.

50/50 at all times, then depending on the steering angle sensor readings it will progtressively allow slip in corners. then when steering angle goes back to 0 it re engages.
Effectively that would be the reverse of haldex now.
Click to expand...
That was my thought too

@Andrew, have you considered in adjusting the split through an Arduino controller? (just came in mind as i've bought one today for another ideea) Adjusting it from inside the car or even have it on a custom "auto mode" that is acting based on throttle pedal position, steering angle, speed, etc is not hard at all. Could have some buttons maybe between the seats (where some of us have the navigation controls) and also an LCD to read the status
:think:
Seems like an ideea that makes me wanna study more..

Anyway I'm very captivated by the discussion as it becomes more and more interesting everytime i come back on forum :) Can't wait to see the results
 
chris99 said:
That was my thought too

@Andrew, have you considered in adjusting the split through an Arduino controller? (just came in mind as i've bought one today for another ideea) Adjusting it from inside the car or even have it on a custom "auto mode" that is acting based on throttle pedal position, steering angle, speed, etc is not hard at all. Could have some buttons maybe between the seats (where some of us have the navigation controls) and also an LCD to read the status
:think:
Seems like an ideea that makes me wanna study more..

Anyway I'm very captivated by the discussion as it becomes more and more interesting everytime i come back on forum :) Can't wait to see the results
Click to expand...

Everyone makes it sounds so simple but to make the above cost money and i can understand why they sell for so much, Its not so simple to make either as the LCD needs coding etc, loom, the stand alone ecu etc etc etc

chaz20vt said:
I wouldn't mind what gops got :)
Click to expand...

Is it the right one for your haldex? there are terms and conditions if i give you this insert
 
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It's easy enough to replace it from underneath. I've done mine twice. It's fiddly to get it in and out but it's still a quick job.

I'd recommend using some string to pull the connector back through over the exhaust (tie some string to the connector end when you remove it, tie it to the new one and pull the string to get it back over). Then hold the gasket to the controller with an elastic band until you get the bolts in for a turn, then cut the elastic band off. Also, make sure you get the gasket on the right way as it can go on two ways of course. Worth ordering a new gasket too. You can reuse the bolts.
 
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I forgot to add, you'll loose a dribble of fluid but nothing to worry about. Although it's worth doing a Haldex service while you're under there if you've not done it for a while?
 
Andrew@A.L.D said:
Everyone makes it sounds so simple but to make the above cost money and i can understand why they sell for so much, Its not so simple to make either as the LCD needs coding etc, loom, the stand alone ecu etc etc etc
Click to expand...
I don't make it sound simple, it is. I am new into this as well, but as I said it's not hard. As the ideea came to my mind while reading the updates from here, felt that I had to share it here, maybe you can benefit from it.

Of course there is some coding there, but being an open source community, you can easily get code, libraries, help etc. The language is C++, I had some experience with it about 10 years ago, I will try and reintroduce myself in this world. Anyone else with basic programming skills is able to code this microcontroller.

The price they ask is justified only if they target to sell 2 or 3 pieces and get profit too :)
Coding a text on LCD is less than 5 min job, then copy/paste for the other units, display is 4$, Arduino is about 18$, modules (shields) 10-25$, sensors about 15$ (temp, pressure or even triple-axis accelerometer), and loom.. lol.. few dollars.

Excuse me but still don't get why they ask for that price. I got the controller and some extra bits, still waiting for a power supply module and lcd, and I will give it a try first with some sensor readings, then will start brainstorming with a friend on the haldex issue.
 
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chris99 said:
I don't make it sound simple, it is. I am new into this as well, but as I said it's not hard. As the ideea came to my mind while reading the updates from here, felt that I had to share it here, maybe you can benefit from it.

Of course there is some coding there, but being an open source community, you can easily get code, libraries, help etc. The language is C++, I had some experience with it about 10 years ago, I will try and reintroduce myself in this world. Anyone else with basic programming skills is able to code this microcontroller.

The price they ask is justified only if they target to sell 2 or 3 pieces and get profit too :)
Coding a text on LCD is less than 5 min job, then copy/paste for the other units, display is 4$, Arduino is about 18$, modules (shields) 10-25$, sensors about 15$ (temp, pressure or even triple-axis accelerometer), and loom.. lol.. few dollars.

Excuse me but still don't get why they ask for that price. I got the controller and some extra bits, still waiting for a power supply module and lcd, and I will give it a try first with some sensor readings, then will start brainstorming with a friend on the haldex issue.
Click to expand...

i hope to see some results with this as all the electronics part of it is over my head

So is anyone wanting to test the insert I made for free?
 
I'll test anything for free . What's the terms and conditions .only live in Oldham not too far from Leeds . I'm up for trading one trade for another .(i'm a industrial door engineer)
 
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Everybody is waiting... i bet everybody intrerested keeps checking the page haha
 
I'm waiting patiently for it to be tested as i couldn't test myself:(
 
Hopefully it will be on the car soon been stuck in the big smoke working (hate London love the north ) coming home today maybe tomorrow just got to get the doors interlocking with the gates barriers and access equipment . It's all getting confusing shouldn't have drank so much last night :scared2:
 
If any of the manufacturing is ever a hold up... i offer my services and machines FOC
 
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No problems.
Just im happy to help with these new ideas, to help keep the cost down for testing
 
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