Anyone here running a Haldex Controller?

ArrEssDrei

Active Member
In the midst of lockdown boredom and way to much time to ponder mods to the RS3, I've been thinking about a haldex controller and was wondering of anyone here is running one, and had any recommendations?

So far I've found 4 and wondered if anyone has any of these:

https://www.vdveer-engineering.nl/index.php/en/shop/controllers/haldex-controller-gen5-0cq-detail

The Syvecs/IROZ unit which is well reviewed on YouTube, which I can't actually find for sale, only a deposit for future stock (and I wonder if they are just reselling the above one perhaps).

Any just came across this which looks awesome with virtual cockpit integration and all:
https://www.dsa-electronic.de/allradsteuerungen/audi/rs3-8v-ab-2013/

MTM: https://www.mtm-online.de/en/shop_en/#/art/haldex

I'd be interested to hear impressions and any advice from other RS3 owners.
 

A3SBQ

A3 SportBack 2TFSI quattro DSG
I have the first option. And gives most customized settings via the phone/app. No extra visibil display or nobs.

I think this is the best for dynamic driving....

For launch and 1/4mil the Syvec/Iroz would be strongest.

The 3rd is cool with integrated in the cluster. But has an extra display and has limited settings... But has a good video on YouTube showing it on snow...

MTM I haven't seen anything of! It's also very expensive!

Sent fra min SM-N975F via Tapatalk
 

Ross_T_Boss

Registered User
I have both the VdV and Iroz/Syvecs controllers. The bottom two are variants of the VdV, "piggy back" devices, I do really like the integration though.

The piggy back is a safe way to play - you won't break anything. They all have pretty good interfaces, the VdV phone app can change quite alot of stuff to dial in the map. It has tables to customise the behaviour changing the haldex pressure based on steering lock, throttle position, boost and speed for example. All accessible via the app.

Iroz is a different kettle of fish, it's a complete replacement controller vs piggyback. It has the ability to exceed the max. pressure valve so you can up-rate that pretty easily and get more clutch pressure. Hence the crazy 0-60 times with it. But, it's not a huge gain overall and not really much benefit if you are not one gunning for that extra 0.1s at the drag strip. I would say the provided map improves on stock behaviour with higher speeds, throttle and steering lock.

If the Iroz controller had an easy interface to update it then I'd recommend it hands down, as you can pretty much custom tune it to do what you want if you can get the software from Syvecs - for example, steering lock will have like 3 different variables rather than just 1! But if you want to make immediate changes (say, lock out the Haldex for ice drifting and then back to stock afterward - just by a flick between settings on an iphone app) the VdV has great versatility and would be better for you.

Either way, just be aware, it's subtle as the stock controller is really well optimised. Haldex can't just be thrown into perma-AWD as the fluid gets hot quick. Basically you want a controller that only uses it when you really benefit and 'rests' it in between. The gap on stock for me is higher speed WOT, especially coming out of bends where it's just going FWD really quickly, or off the line with 700nm+ you do benefit from more Haldex pressure off the line. Also it bleeds off with lock too quickly for my liking.
 

ArrEssDrei

Active Member
Thanks so much for the replies @Ross_T_Boss and @A3SBQ . Very interesting to know that the Syvecs/IROZ unit actually replaces the stock controller and can exceed max pressure, I didn't realise this as there isn't much info on it. It is the vanityaudi YouTube that really caught my attention knocking .2 off his 60' and quarter mile with the IROZ unit. The potentiometer control seems really archaic though, so the appeal of the piggyback unit is quite strong for me, but it is primarily the launch traction improvements that I want it for.

I'd be very interested to know both of your impressions when it comes to launching the car with the VdV unit. Did you see much/any improvement (assuming you did any timing tests)?
 

Ross_T_Boss

Registered User
I'd be very interested to know both of your impressions when it comes to launching the car with the VdV unit. Did you see much/any improvement (assuming you did any timing tests)?

On the pot. Basically at about the 1/2 way mark the pump duty is "100%" which will give you something similar to stock pressure. You have 4 not very obvious points either way that will increment that in either direction of circa +/- 5%. If you just max it out you'll give the axles a hard time, a few have broken them, so there is some extra risk in it. But it's not just that, you do want to prevent the rear wheels spinning too much, the idea of the pot is "fine tuning" is an easy access knob. Get to where the rears are lighting up too much and slowing you down, then dial it back a bit. I have mine in the arm rest.

That said, I need to follow up with Syvecs as you can have a 4-way map switcher instead, and I'd rather have that and the ability to fine tune each. I did ask the pot can be re-purposed but sounds like "it could be but would need a firmware update for it, so no".

It's that extra pressure on launch that gives the benefits off the line. I logged Haldex PWM stock, VdV, Iroz and through 1/2 gear stock and VdV are exactly the same - max "stock" pressure. Iroz controller keeps it higher throughout then drops off at a lesser rate also. Worth noting, the pressure valve will only allow about 5% extra in reality so you do need to change that for full effect, although as said, there is some risk doing so (Iroz send a tighter spring I think - I sorted out mine DIY style).

Re: testing - Dragy as expected reported the same times... I've had 2.7 on the stock controller, and with VdV "locked" also. With the Iroz there is the problem of launch boost, so basically my "low torque" LC file with Unitronic bogs down a bit off the line. I need to run their mid-level "drag radial" file really but haven't been able to get it working for my ECU just yet - it will come and hopefully can get into the 2.5s 0-60 zone with that (PS4S on the street...) My current PB is with the Iroz controller @ 2.6s.
 

StuW13

Registered User
I understand changing the front to rear bias but what did you mean when it changes the pressure. I see IROZ have the single control knob so how do you change the pressure?

mid there any danger to the rear diff increasing the bias because I read it’s not as robust as the front. I’m just about to change the diff in the front to a Wavetrack which is less fragile than the oem one.
 

ArrEssDrei

Active Member
Thanks Ross, sounds like the Iroz/Syvecs is the only one worth having as far as launch traction is concerned. I'd hoped the fancy piggybacks might help the rear engage faster and improve launch traction, but sounds like it didn't do much for you.

Our of curiosity though, were you running an uprated valve sprint with the vdv controller? Is the spring worth anything on its own without a controller?
 

Ross_T_Boss

Registered User
I understand changing the front to rear bias but what did you mean when it changes the pressure. I see IROZ have the single control knob so how do you change the pressure?

mid there any danger to the rear diff increasing the bias because I read it’s not as robust as the front. I’m just about to change the diff in the front to a Wavetrack which is less fragile than the oem one.

Pressure = more rear bias. The controller is just altering pressure to increase/decrease engagement, the single knob is just changing one variable to increase/decrease the scaling to dial in hook-up. It has a complete brain in there with very complex map capabilities, just a shame it's so hard to customise and switch maps.

I wouldn't worry about the diff personally, rear axles and the prop are another story, there's a few casualties out there as a result. Wheel hop at the rear won't end well! Personally using rear subframe inserts and trailing arm spherical bearings to help, all well but only on PS4S so not really pushing it much.

Thanks Ross, sounds like the Iroz/Syvecs is the only one worth having as far as launch traction is concerned. I'd hoped the fancy piggybacks might help the rear engage faster and improve launch traction, but sounds like it didn't do much for you.

Our of curiosity though, were you running an uprated valve sprint with the vdv controller? Is the spring worth anything on its own without a controller?

I can't say I have tried it - no reason to be honest, you can't increase pressure with a piggy back so no theoretical way it can help unless someone can bypass. I was disappointed when I tested and logged and realised I just had to get the Iroz one. It's a great unit and this reminds me I need to follow up with Syvecs as the software should be out to map map changes for those of us so inclined - just a shame you have to physically plug it into a laptop to do so, but to be fair I can't actually see any reason to change the current map, it works really well for daily, fast road and turn the dial up a bit = great for drag racing.
 

ArrEssDrei

Active Member
Pressure = more rear bias. The controller is just altering pressure to increase/decrease engagement, the single knob is just changing one variable to increase/decrease the scaling to dial in hook-up. It has a complete brain in there with very complex map capabilities, just a shame it's so hard to customise and switch maps.

I wouldn't worry about the diff personally, rear axles and the prop are another story, there's a few casualties out there as a result. Wheel hop at the rear won't end well! Personally using rear subframe inserts and trailing arm spherical bearings to help, all well but only on PS4S so not really pushing it much.



I can't say I have tried it - no reason to be honest, you can't increase pressure with a piggy back so no theoretical way it can help unless someone can bypass. I was disappointed when I tested and logged and realised I just had to get the Iroz one. It's a great unit and this reminds me I need to follow up with Syvecs as the software should be out to map map changes for those of us so inclined - just a shame you have to physically plug it into a laptop to do so, but to be fair I can't actually see any reason to change the current map, it works really well for daily, fast road and turn the dial up a bit = great for drag racing.

Thanks for your input mate, you've saved me a lot of money and heartache buying the wrong one. Will go IROZ when I'm ready to pull the trigger.
 
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