SwedeSpeed - Volvo Performance Forum banner

1 - 12 of 12 Posts

·
Registered
Joined
·
37 Posts
Discussion Starter · #1 ·
I'm considering purchasing an XC90, either FWD or AWD. Aside from the fact that AWD will be better in snowy weather, are there any other advantages of an AWD model vs. an FWD model? Does DSTC and roll-over stability work equally as well with the FWD as it does with the AWD? (Do these systems rely on AWD?)<p>Thanks<p>Also,<br> Is fuel economy any better on a FWD model?
 

·
Registered
Joined
·
1,185 Posts
Re: FWD and AWD (j421)

The Haldex AWD system used in the XC90 is fwd biased. Meaning that when no wheel slippage is detected the system sends 90% power to the front wheels and 10% to the rear. It is not a full time AWD system. As soon as wheel slippage is detected then the system does its magic. <p>Having said this, for the XC90 I think the fuel ecomony difference between a FWD or AWD version is negligible at best. As far as the DSTC & Roll Over systems they work equally as well in both versions.<p>One thing resale will be better for the AWD version than a FWD only. Most people who buy a SUV do so for the AWD capability.
 

·
Premium Member
Joined
·
724 Posts
Re: FWD and AWD (j421)

Since it rains everywhere I'd say AWD rules for inclimate weather, whether it be rain or snow!
 

·
Registered
Joined
·
827 Posts
Re: FWD and AWD (myxc90)

<p>Where do you live?<p>Does it snow, or do you go to places that it does snow (or freeze)?<p>If yes, then the AWD is for you (in my opinion). We bought ours when we were in CA and went to <br>the Mtns in the winter. Here in TX I doubt the AWD is needed.
 

·
Registered
Joined
·
2,319 Posts
Re: FWD and AWD (dmd)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote »</i></TD></TR><TR><TD CLASS="quote">Here in <fill in the blank>, I doubt the AWD is needed.</TD></TR></TABLE><p>Just like ABS, air bags and stability control, AWD is normally not needed. But, there are situations when they are invaluable. Snow is one case, rain is another -- not to mention mud. For example, in the rain, AWD can reduce your chances of aquaplanning.<br>Thankfully, it is an option. Whoever wants it, can get it. For some people (like me), improving the odds of a good outcome when Murphy hits seems like a good investment.
 

·
Registered
Joined
·
91 Posts
Re: FWD and AWD (ig_mb)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>ig_mb</b> »</i></TD></TR><TR><TD CLASS="quote"><p>For example, in the rain, AWD can reduce your chances of aquaplanning.<p> </TD></TR></TABLE> <IMG NAME="icon" SRC="http://www.vwvortex.com/zeroforum_graphics/screwy.gif" BORDER="0"> <p>While I have AWD and am glad I do, to be fair it is of no value in preventing hydroplaning.<p>Water doesn't compress easily. Hydroplaning is the result of your tires moving FAST across a wet surface - so fast that they do not have sufficient time to channel that moisture away from the center of the tire. The result is that the tire is lifted by the water away from the road and all traction is thus lost.<p> <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/cool.gif" BORDER="0"> <p> <br>
 

·
Registered
Joined
·
2,319 Posts
Re: FWD and AWD (Volvoneophyte)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Volvoneophyte</b> »</i></TD></TR><TR><TD CLASS="quote">While I have AWD and am glad I do, to be fair it is of no value in preventing hydroplaning.</TD></TR></TABLE><p>Indeed, AWD cannot prevent hydroplanning. That was a wrong wording choice on my part. Sorry for the confusion.<p>If the traction wheels hit a puddle of water and hydroplane, your AWD will maintain traction so long as other wheels are not hydroplanning. The point that I clearly failed to make was that with AWD (vs FWD or RWD), the chances of maintaining traction double, which may be sufficient to help someone control of the car.<p>Of course, if all 4 wheels hydroplane simultaneously, only an anchor can help you <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0"> <br>
 

·
Registered
Joined
·
827 Posts
Re: FWD and AWD (ig_mb)

<p>Hydroplain is just that, weather you have AWD or not. if you have the 2 front tires loose traction with 2WD OR AWD, still the steering is lost and the back two wheels have traction. AWD does not help other than maybe allowing some more drag. AWD may actualy hurt in that the rear wheels may provide the ability to keep going fast even with the fronts having lost traction.<p>AWD helps when the wheels have limited traction and the other wheels can provide better traction to keep moving, and somewhat with slowing.
 

·
Registered
Joined
·
83 Posts
Re: FWD and AWD (dmd)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>dmd</b> »</i></TD></TR><TR><TD CLASS="quote"><p>...AWD does not help other than maybe allowing some more drag. AWD may actualy hurt in that the rear wheels may provide the ability to keep going fast even with the fronts having lost traction.<p>AWD helps when the wheels have limited traction and the other wheels can provide better traction to keep moving, and somewhat with slowing.</TD></TR></TABLE><p>Remember, that the XC-90 has more than just AWD, it has DSTC which makes the brakes, power, and steering work together. The key is that you should not turn off the DSTC, especially during inclement weather. <p>In southern Nevada, the AWD & DSTC combo is worth it's weight in gold because people here don't know how to drive in the rain (we seldom receive). My XC90 and S-60 AWD have done quite well in several bad situations. <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0"> <p>AFFalcons
 

·
Registered
Joined
·
83 Posts
Re: FWD and AWD (j421)

J421,<p><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>j421</b> »</i></TD></TR><TR><TD CLASS="quote"> Does DSTC and roll-over stability work equally as well with the FWD as it does with the AWD? <br></TD></TR></TABLE><p>Short answer <U>No</U>, DSTC with AWD adds another capability by shifting power between different wheels to assist in keeping the vehicle traveling in the direction commanded by your steering wheel...with FWD you <U>don't</U> have the ability to shift power to the rear wheels.<p>AFFalcons
 

·
Registered
Joined
·
371 Posts
Re: FWD and AWD--> Go for AWD!

DSTC, with AWD, will always make sure the power distribution to the wheels meets the current driving conditions. Regardless of the weather. So, if you like jack-rabbit starts, the DSTC will shift more power to the rear wheels since the front looses traction when you accelerate. Same thing, but in reverse, when you brake.<p>When I attended the Volvo Professional Driver's Course, one of the demonstrations they put us through was hydroplaning. We were driving the XC90 (not ours) during this lesson and I was VERY impressed with how stable the 90 was during the event. The specifics of the course were drive straight ahead at about 50 mph then enter the water (about 1" deep fully across the road) to experience how the Volvo would react. The XC90 shrugged it off, yes, we lost steering, but the car did not wander or drift. Here's a picture of an S-60 hitting the water:<p><IMG SRC="http://img.photobucket.com/albums/v630/Bobalouie3/Hydroplane.jpg" BORDER="0"><p>We also got to experience the value of AWD during our list ski trip to Austria. On the drive down, we hit a nasty mess of heavy snow & slush. The plows had taken good care of the right lane, but there was a stip of slush on the far left side of the left lane, which I hit a couple of times as I was passing folks on the Autobahn. The 90, again, was quite stable, but I could feel the DSTC kick in to reduce engine power and brake the left wheels somewhat to keep them from spinning. There was no tug to the left, as you would expect, from hitting the slush. Then once we were at the ski resort, we were driving up very steep, snow coverd hills with just the OEM 18 inch tires. Never had any slipping or hesitation. The 90 just motored right along. I was quite impressed.<p>Given all the advantages and the very few drawbacks, I'd go for AWD.
 
1 - 12 of 12 Posts
Top