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Discussion Starter · #1 ·
I am doing some testing for a standalone haldex control system developed for vw and audi applications. I am unsure if you guys have ever found an upgrade for your cars so this is just a feeler. <p>The vw/audi application comes with 3 modes<br>1. 50/50 split with staged torque onset, full release under braking/ebrake activation.<br>2. Fully adjustable torque split, onset rate of torque transfer, fully adjustable torque release under braking.<br>3. Off for towing/fwd dyno's, etc<p>The unit comes with a billet enclosure to house the stepper motor controller, a DIN plate with 20x4 line LCD display (10 color combinations available), push buttons to select mode, torque + or -. The differential fluid temperature is displayed and will release the haldex if the temp becomes to hot.<p>The oem controller is removed from the differential and modified. The new system uses the same OEM plug for a secure factory like connection. The possiblity of creating a switchable unit is being discussed. THis would allow the factory system to be used on the street and the standalone system to be energized at the track.<p>This will defeat operation of any stabilty control systems and trigger the related DTC's.<p>Question 1.<br>Does the volvo engine ecu go into limp mode if the haldex is removed from the can buss? If not, this will work.<p>So, if anyone in the Houston area is interested in trying something out in the near future let me know.<p>R
 

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I have no idea as to the technical questions.... but I do recall someone looked into getting a new program for our AWD system and it was determined we can't do it. maybe this stand alone setup might work??<p>anyone here know?
 

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damn i hope you figure something out, because a symmetrical torque split would be AWESOME!
 

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Re: (23109VC)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>23109VC</b> »</i></TD></TR><TR><TD CLASS="quote">I have no idea as to the technical questions.... but I do recall someone looked into getting a new program for our AWD system and it was determined we can't do it. maybe this stand alone setup might work??<p>anyone here know?</TD></TR></TABLE><p>Evolve had a collaboration with Haldex but the outcome was that the project was shelved.<p><A HREF="http://forums.swedespeed.com/zerothread?id=18573" TARGET="_blank">http://forums.swedespeed.com/zerothread?id=18573</A><p>From the article per Johann<br><I>Engine CEM and aux parts still use CAN system.<br>MOST is mainly used for multimedia stuff inside the XC90 but the ECU and CEM still use CAN and so does the SUM.</I><p>I don't think that answers your question though. <br>
 

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Re: (Rangeball)

Pulling the fuse will trigger some AWD/DSTC events but no engine DTC's, plenty of people have dyno'd their R's with the Haldex disabled.<p>There have been a few reports of dead Haldex control units which didn't trigger any codes at all.
 

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te haldex unit is under the car and looks VERY similar to the R32 unit. Quaife also has some things in the works.... stay tuned for that
 

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Discussion Starter · #7 ·
Re: (R_Rated)

Up until the 2006 model year, the vw/audi haldex equipped cars were "generation 1". The A3 and passat are now gen 2. The other audi vehicles are the torsen system.<p>Ok, you answered the question. You pull the haldex fuse to fwd dyno just like we do. Engine ECU doesn't care that the haldex fell off of the can-bus. <p>Now I need a test vehicle. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/wink.gif" BORDER="0">
 

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Discussion Starter · #8 ·
Re: (Allen0506)

To further elaborate.<p>Unlike the vw/audi's, haldex has not yet offered (or will never) offer a factory updated unit (haldex performance part). The entire design basis behind this system was for vehicles converted to awd not for upgrading existing systems. We simply had no need to do so with the factory offering.<p>The only reason I know about you guys is because I happened upon your website months ago while doing research. After reading all of the good info on here, I figured you guys may want a possible solution. <p>We are also looking at building a dash selectable interface which will allow on the fly transition between the oem system and the standalone. I was informed that this will require a faster processor with a much larger memory to support both system architectures. <p>I am 99% confident that the current system will work just fine. It will just require a physical swap of the haldex control module. Unfortunately, you guys would have to source these to be converted. Hmm.. I'll get back to you on trying to do a dual system as that may make more sense and be more cost effective in the long term.<p>R
 

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Re: (Allen0506)

I, like all others I imagine, whole heartedly endorse any efforts to create performance upgrades for the R. However, I recall from tracking Evolve's efforts that a brick wall was thrown up (I believe by Volvo) AFTER a solution was supposedly developed. <p>You might want to take a moment and give Don at Evolve a call to find out if this is accurate as many think it is and whether there are some hardware constraints in the R that make this type of solution not work (e.g., perhaps the R wasn't designed to handle a constant split - perhaps the transmission can't handle power surges when the wheels can't break traction and the driveline has to handle all the power.)<p><B>I don't know for sure either way</B> but it was <I>hinted </I> to me that there were some physical constraints that Volvo is aware of that may make suspect widespread mechanical problems from a custom Haldex torque split controller.
 

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Re: (rollie)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>rollie</b> »</i></TD></TR><TR><TD CLASS="quote"><br><B>I don't know for sure either way</B> but it was <I>hinted </I> to me that there were some physical constraints that Volvo is aware of that may make suspect widespread mechanical problems from a custom Haldex torque split controller.</TD></TR></TABLE><p>...such as angle gear failures after 3k miles? <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/wink.gif" BORDER="0">
 

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Re: Anyone in Houston Interested in trying a haldex upgrade? (Allen0506)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Allen0506</b> »</i></TD></TR><TR><TD CLASS="quote">The unit comes with a billet enclosure to house the stepper motor controller, a DIN plate with 20x4 line LCD display (10 color combinations available), push buttons to select mode, torque + or -. The differential fluid temperature is displayed and will release the haldex if the temp becomes to hot.<p>The oem controller is removed from the differential and modified. The new system uses the same OEM plug for a secure factory like connection.</TD></TR></TABLE><br>So, it's a new stepper, and a modified controller? The existing controller is not exactly a module, it's a circuit board under the dimpled housing, so I wonder what "OEM plug" you refer to? The existing external connector only carries in +12V, gnd, can+ and can-.<p>No limp mode is triggered by a missing or disabled Haldex in the Volvo. But, it does generally cause an informational message and a brake module (antiskid) code to be stored. The message clears after restoring the Haldex and driving a short distance.<p>You might be interested to know the same module, and the same programming, is used in all Volvo models. When powered on, the modules determine which car they are in, and use the appropriate stored map.<p>Very interested in your work!<p>Tom.
 

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Re: Anyone in Houston Interested in trying a haldex upgrade? (Allen0506)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Allen0506</b> »</i></TD></TR><TR><TD CLASS="quote"> So, if anyone in the Houston area is interested in trying something out in the near future let me know.<p></TD></TR></TABLE><p>I think honestly you'll have to pick up the tranny-back driveline warranty to find a test mule but I could be wrong.<p>Things could get very costly if the Volvo Haldex has some quirk that makes the upgrade cause failures. Not likely but possible enough to be very worrying to potential testers.<p>Some testing and a "track" history and you could have a small but enthusiastic sideline market.
 
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