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<IMG SRC="http://www.schnellauto.com/images/xc90_side.jpg" BORDER="0"><p>My wife and I took our 2006 XC90 V8 to Las Vegas over the past weekend. It’s about 310 miles each way, across the LA Basin and a large southwestern desert. Understandably, it was HOT this weekend.<p>This was our first “long distance” trip in the XC90, so I hooked up an OBD-II reader (CarChip E/X) to check out intake temps, speeds, and coolant temps. I also had my handheld GPS (Garmin iQue 3600) for navigation and speed readings. I brought along a handheld infrared thermometer for temp readings.<p>With the various instruments, I was able to do interesting observations about the tires, coolant temperatures, and intake temperatures. I was also able to get some fuel economy information.<p>Before the trip, I replaced the front brake pads, had the front two windows lightly tinted, changed the oil/filter and put in 7 fresh quarts of full-synthetic 10W-30 motor oil, topped off the coolant with a 50/50 mixture, and pumped all four VR-rated (150 mph) Michelin tires way up to 37 psi cold. I was going to be driving fast, across a very hot desert, so I didn’t want a blowout.<p>First of all, the XC90 did very well. As expected, the ambient temps were mostly 90-110 F, with most of the desert driving in the 110-115 F range. At one point, the temps (all based on the dash temp gauge) were reading about 117 F for a couple hours, and then they started going up to finally spike at 122 F (sorry, the pic is only at 121 F)! <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/eek.gif" BORDER="0"> The highest temperature was in Baker, California. It is next to Death Valley (reading 125 F that day, according to the weather service).<p><IMG SRC="http://www.schnellauto.com/images/xc90_121.jpg" BORDER="0"><p>The tires were really taking abuse. I was driving 70-100 mph for most of the trip (GPS recorded a max of 106 mph) and the sidewalls were heated to about 145 F on the fronts, and 135 F on the rears (expected with a front weight bias). Tread temps were recorded at 152 F. on the front tires at one point! At the hottest point, I checked tire pressures and recorded the fronts at 45 psi (rears at “only” 43 psi). I didn’t bleed pressure. As it was, there were no tire issues to report whatsoever with the Michelins.<p>The CarChip tool precisely takes a measurement of the intake temperature once every five seconds. With the computer software, you are able to determine exactly when the measurement was taken so you can correlate it to ambient temps, and coolant temps.<p>Coolant temperatures were interesting to watch. Most late-model engines like coolant temps to be about 200 F. when fully warm and they don’t fluctuate much. The Yamaha V8 in our Volvo is no exception. Under most conditions, the radiator and electric fan kept coolant temps between 190-205 F. Interestingly enough, at one point the coolant temp climbed up and spiked at 225 F! Ambient temps were about 105 F and my speed was varying between 45-75 mph in traffic. Seems the electric fan was off, and then it kicked on a bit late. The coolant dropped back to about 190 F eight minutes later. The hottest part of the trip, when the XC90 was parked with the engine idling with the A/C on in 120 F ambient temps for nearly 10 minutes… the coolant was stuck at 201 F. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0"> Amazing.<p>Intake temperatures were another story. The V8 has a very efficient intake, meaning the intake temps are very near ambient temps (don’t try to sell me a cold-air intake on my Volvo). For all practical purposes, the intake temps just about mirrored ambient temps – until we slowed or stopped. Then, the heat from the engine started to cook things! When idling, the intake temps would creep from 105 F to 160 F! That costs some horsepower. The nice part was the “cooling” of the intake would only take a minute or two at highway speeds before intake temps were back to normal. Thank goodness for plastic intakes – an aluminum CAI would take much longer to cool down.<p>Finally, fuel economy information. Our V8 is thirsty as a daily driver/commuter. Thirsty means we are averaging 14.97 MPG combined right now with our XC90. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/sly.gif" BORDER="0"> Yes, it sucks. I wasn’t expecting much better on this Vegas trip.<p>Well, the Volvo surprised me with 20.76 MPG (306.9 mile trip) on the way to Vegas, and 20.22 MPG (326.8 mile trip) on the return! Those numbers were calculated the old fashioned way – trip odometer divided by pumped fuel (the OBC claimed about .5 MPG higher). Crazy fuel economy for a 5,000 pound SUV, especially considering I spent nearly two hours above 76 mph (according to the CarChip telemetry). <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/eek.gif" BORDER="0"> <p>So, overall the XC90 was a great road trip vehicle. I would have liked a bit more lumbar support for my back, and a bit tighter steering feel above 80 mph… but I came back pretty impressed. <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0"> <p>That reminds me, I need to let some air out of the tires... <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/wink.gif" BORDER="0"> <p>- Mike<br>
 

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Any issues with air conditioning not keeping up? Sounds great. Where did you get the OBD II reader and where did you place the display?<p>Thanks
 

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Re: I just drove my XC90 to Las Vegas in 122 F ambient temps... (Emission)

Dude, I have to say you are one of the most meticulous people I have come across in quite a while. Wow, what a bunch of data! Nice job! <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0"> <p>If you think the 160 degree IAT's were costing you HP, I don't want to think what the R's turbo engine with an aluminum over engine charge pipe must be like in those conditions. I bet it would be down 40 HP. <p>Very interesting data, though. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0">
 

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Hey you weren't staying at the Marriott Residence INN were you? I was there Saturday night and left Sunday night on a layover for my airline job and noticed a Titanium grey XC90 V8 parked out by the hotel and it had California tags, reverse sensors, looked great.
 

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Yes! I still win<br><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>needsdecaf</b> »</i></TD></TR><TR><TD CLASS="quote">one of the most meticulous people I have come across </TD></TR></TABLE><br>Agreed!<br><IMG SRC="http://i82.photobucket.com/albums/j267/GhawiJ/hot.jpg" BORDER="0">
 

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Discussion Starter · #6 ·
Re: (C130)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>C130</b> »</i></TD></TR><TR><TD CLASS="quote">Hey you weren't staying at the Marriott Residence INN were you? I was there Saturday night and left Sunday night on a layover for my airline job and noticed a Titanium grey XC90 V8 parked out by the hotel and it had California tags, reverse sensors, looked great. </TD></TR></TABLE><p>Unless my wife snuck out on me at night... we were staying at the Mandalay Bay. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/wink.gif" BORDER="0">
 

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Discussion Starter · #7 ·
Re: (eclou)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>eclou</b> »</i></TD></TR><TR><TD CLASS="quote">Any issues with air conditioning not keeping up? Sounds great. Where did you get the OBD II reader and where did you place the display?<br></TD></TR></TABLE><p>The A/C was flawless (and I really thought it was going to be an issue).<p>We have the "rear A/C" and I kept it on for about an hour into the trip to cool down the car. We used the "AUTO" setting the whole trip, with the temps set at "72" on each side. After about 2 hours of driving, it was too cold and we'd end up turning the temps to "74" on each side. We finally ended up in Vegas with the temps at "76" on each side! <p>The "72" setting may be fine in 80 F ambient temps, but at 115 F the temperature spread from outside (40+ degrees!) is just too much - it just feels too cold. <p>The A/C was just fine. <p>Now, on the other hand... that wood steering wheel was HOT, HOT, HOT!<p>The CarChip E/X plugs into the OBD-II port (near your left knee). Here is a link to an article I wrote about it:<p><A HREF="http://www.infiniticarclub.org/accessories/gadgets/read.asp?ArticleID=210896" TARGET="_blank">http://www.infiniticarclub.org...10896</A><br>
 

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Discussion Starter · #8 ·
Re: (Copeland)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Copeland</b> »</i></TD></TR><TR><TD CLASS="quote">Yes! I still win<p></TD></TR></TABLE><p>I also saw 129 F on the display - when I was parked!<p>My 121 F is at 70 mph! <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/cool.gif" BORDER="0">
 

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Re: I just drove my XC90 to Las Vegas in 122 F ambient temps... (needsdecaf)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>needsdecaf</b> »</i></TD></TR><TR><TD CLASS="quote">If you think the 160 degree IAT's were costing you HP, I don't want to think what the R's turbo engine with an aluminum over engine charge pipe must be like in those conditions. I bet it would be down 40 HP. <p>Very interesting data, though. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0"> </TD></TR></TABLE><p>I thought that pipe was made out of titanium...<p>Yannis
 

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Re: (Emission)

customer of mine shot a pic w/ his camera phone of his S40 @ 131 degrees!
 

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Re: I just drove my XC90 to Las Vegas in 122 F ambient temps... (GrecianVolvo)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>GrecianVolvo</b> »</i></TD></TR><TR><TD CLASS="quote"><p>I thought that pipe was made out of titanium...<p>Yannis</TD></TR></TABLE><p>actually, its made of unobtanium. Which is why the current one is plastic.<p>Still, its not so bad, at least we won't have Chrysler engines in our cars <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/tongue.gif" BORDER="0">
 

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Re: (Copeland)

I thought I won, but when I looked on my pictures on my phone it said 122 degrees. 2nd or 3rd place isn't bad.<BR><BR>
<i>Modified by david at 10:03 AM 7-29-2006</i>
 

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Re: I just drove my XC90 to Las Vegas in 122 F ambient temps... (VolvoMax)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>VolvoMax</b> »</i></TD></TR><TR><TD CLASS="quote"><p>Still, its not so bad, at least we won't have Chrysler engines in our cars <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/tongue.gif" BORDER="0"> </TD></TR></TABLE><p>Yep...just Ford engines...<IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/wink.gif" BORDER="0"><p>Yannis
 

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Next time you are running in hot weather with the tires pumped up, check the tread temps on each edge and in the center. Then you will know if the tire pressure was optimized. At 47 psi the center may have been much hotter than the edges. Lowering the pressure may be been easier on the tires, but there is no way to know for sure, without measurements.<p>We ran our XC90 in the low hundreds set about the same and the "hand" test indicated the tread was nearly the same temp all the way across, but only a tire pyrometer would show it for sure and I didn't bring it. Argggg!<p>Nice job paying attention to details.<p>jib
 

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Discussion Starter · #16 ·
Re: (jib)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>jib</b> »</i></TD></TR><TR><TD CLASS="quote">Next time you are running in hot weather with the tires pumped up, check the tread temps on each edge and in the center. Then you will know if the tire pressure was optimized. At 47 psi the center may have been much hotter than the edges. </TD></TR></TABLE><p>That's a good idea.<p>So many idiots were on the side of the road with blown tires (and blown trailer tires) from driving across the desert with underinflated tires. I'd swear there was a car on the side every few miles! People just don't pay attention to their tires these days.
 

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Re: I just drove my XC90 to Las Vegas in 122 F ambient temps... (Emission)

Excellent "report". Your detailed observations are certainly to be commended!<p>BTW, did you notice any changes in temperature when transitioning from highway speeds to a dead stop?
 

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Re: I just drove my XC90 to Las Vegas in 122 F ambient temps... (RearWheelPaul)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>RearWheelPaul</b> »</i></TD></TR><TR><TD CLASS="quote"><br>BTW, did you notice any changes in temperature when transitioning from highway speeds to a dead stop?</TD></TR></TABLE><p>Coolant temps, intake temps or ambient temps?<p>
 
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