You are here: Forums SUVs Chevrolet Suburban & Tahoe 2007 and newer Chevrolet Tahoe and GMC Yukon

2007 and newer Chevrolet Tahoe and GMC Yukon

3122 messages,  Last post on Oct 29, 2009 at 11:39 AM

You are in the Chevrolet Suburban & Tahoe Forum. Your Hosts are steve_ & tidester

What is this discussion about? Chevrolet Tahoe, GMC Yukon, SUV

Messages Page 248 of 313 1 ... 245 246 247 248 249 250 251 ... 313 Prev Next Last

Go To Msg # Search This Discussion

#2471 of 3122 Re: Yukon/Tahoe vs Denali, regular vs XL ??? [gfraigun] by jerrywimer Apr 25, 2007 (3:43 am)
Replying to: gfraigun (Apr 24, 2007 7:35 am) There can actually be three sources with just the wireless headphones and the speakers. There's a 1-2 (A-B) switch on the wireless headphones that allows one wearer to be hearing the audio from a DVD while the second uses the audio controls to choose a different radio / sat source than the speakers are playing and listen to that. I only know this because my kids have accidently changed the switch and then complained that they weren't hearing the DVD, but were hearing music.   However, with the Nav, you most definitely cannot play a CD *and* and DVD at the same time. As I said, while there are two slots, the one behind the nav display is for the Map DVD *only*, leaving you to choose whether you want to have a CD or the kids' DVD playing in the top slot. Replies to this message: 4burb (Apr 25, 2007 6:07 am)
#2472 of 3122 Re: Fuel low, but not really... [mrowl1] by jerrywimer Apr 25, 2007 (3:45 am)
Replying to: mrowl1 (Apr 24, 2007 3:45 pm) Yep. You were probably parked on a downhill slope? My space at work is like this, and I sometimes get the same thing when I first crank up the Av in the evening.
#2473 of 3122 Re: Yukon/Tahoe vs Denali, regular vs XL ??? [jerrywimer] by 4burb Apr 25, 2007 (6:07 am)
Replying to: jerrywimer (Apr 25, 2007 3:43 am) Agreed on the 3 sources. My kids have been watching a DVD with headphones while wife was listening to a CD with headphones while I was listening to XM over the speakers. Whatever happened to family time on the family trip ?
#2475 of 3122 Benefits to wheel size? by kimdvm1 Apr 25, 2007 (4:15 pm)
What are the benefits/disadvantges of adding the larger wheels on a Denali (I am only considering factory wheels, not aftermarkets). I hear mixed opinions on ride, stability, mileage, etc. Replies to this message: jerrywimer (Apr 26, 2007 5:35 am)
#2476 of 3122 Re: 2007 Console (Woodgrain upgrade) [obravada] by 73shark [obravada] [mayh [obravada] [mayher] by obravada Apr 25, 2007 (4:53 pm)
Replying to: mayher (Mar 26, 2007 11:05 am) The woodgrain console arrived today. Took me longer to unpact the part then it did to install. It was very easy to remove the original console (held in by 4 clips) and re-install the new one. Looks great. Total cost including delivery to Connecticut was $112.
#2477 of 3122 Re: Yukon/Tahoe vs Denali, regular vs XL ??? [gfraigun] by 73shark Apr 25, 2007 (5:00 pm)
Replying to: gfraigun (Apr 23, 2007 9:23 am) "I think it would be way better if the truck Idled in V4 rather than V8"   Go out and pull four plug wires and see how it idles, then you'll see while it idles in V8 mode.
#2478 of 3122 Re: 2008 Tahoe [gabatta] by jamesfletcher2 Apr 25, 2007 (6:17 pm)
Replying to: gabatta (Mar 08, 2007 2:01 pm) gabatta,   I just got a second e-mail from Chevy Marketing today and they said that building of the 2008 Tahoes will start on 6-25-07 and that they will be available at dealers in September. I was asking them if the 6-speed will be available in both e-mails and also they would not commitment they did say the dealers would have information on the 2008s soon. I read that to be in May.   My feeling is that the 6-speed will be available but possibly only with certain engine combinations.
#2479 of 3122 Re: Benefits to wheel size? [kimdvm1] by jerrywimer Apr 26, 2007 (5:35 am)
Replying to: kimdvm1 (Apr 25, 2007 4:15 pm) Larger wheels generally add to the feeling of stability during cornering, because of shorter sidewalls on the lower profile tires that flex less as the vehicle corners. This is pretty much a certainty.   Ride usually becomes a bit harsher than smaller wheels for the same reason (the larger sidewall flex actually acts as part of the suspension, helping absorb bumps a bit). This is also practically guaranteed.   Fuel economy is the one area that isn't really guaranteed. Optional larger sized wheels through the manufacturer usually keep the outer diameter of the tire pretty much the same (hence the lower profile and the two effects above). The issue with fuel economy is that the wheel itself generally has more rotational mass than the tire mounted on it. Ironically, even if you put two wheel / tire combos of different sizes on a scale and they come out the same, it's how far from the center that the mass is located that has the big effect on braking and acceleration. The more of it located toward the edge, the harder it is to get it moving and to get it stopped again. This is why most experts recommend upgrading brake systems if you go with larger aftermarket wheels. GM is fairly conservative with safety issues, so I highly doubt you need to worry about the brakes being lacking with factory optional wheels. Fuel economy might suffer too, but probably no more than 1 mpg. Then again, depending on the actual mass of the larger wheels and tire, it might not. In either case, your driving style and conditions will have a greater effect than the wheels and tires.   The best way to decide is to try out a Denali with each size of wheel for yourself if you can. If you already own the vehicle and are considering this as an upgrade to it, just keep the above points in mind.
#2480 of 3122 Re: Yukon/Tahoe vs Denali, regular vs XL ??? [gfraigun] by jerrywimer Apr 26, 2007 (5:53 am)
Replying to: gfraigun (Apr 23, 2007 9:23 am) 73shark makes a very good point about how it'd feel to have it idle in V4 mode. Trust me, he's right- kill your battery so the computer system's all mixed up when you jump it, and you might feel the engine switching back and forth at idle, as my Av did once. Not a pleasant experience. Fortunately, once I was able to turn it off and restart it with a good charge, everything returned to normal.   Besides that point, idling is wasteful period. Better would be to add the mild-hybrid system GM has on some of their other small vehicles right now, that completely shut down the engine at a stop, and then use the modified alternator / battery system to get moving and restart the gas engine when needed.   Secondly- you'd be surprised. I don't know exactly what conditions the engine computer is using to decide whether to use V4 or V8 mode on downhill grades, but it doesn't always do just one or the other on the single steep 6 mile stretch of interstate I travel daily. While I haven't figured out what makes it decide to use V4 or V8, I've paid close attention to the instant mileage readout on that mountain.   What I've found is consistent with what I'd seen with the 2004 Silverado Z-71 5.3l 4 speed auto on the same hill in V8 mode: 1) The truck and my Avalanche both normally unlock the torque converter (seeming to almost completely freewheel), allowing the engine RPMs to drop to slightly lower than even a normal idle speed. 2) Fuel economy goes WAY up on the instant readout. Since this seems to be used for the average mpg readout, and since my average that I manually calculate at the pump every fillup is relatively close (no more than maybe 1 mpg off in either direction) to that readout, I assume the instant isn't too far off either. Gotta admit, 99mpg (max it can display) is a rush!   In V4 mode with the Avalanche, the same things seem to happen. However, the instant readout doesn't go quite as high, and I've noticed that fillups bear out a slightly *lower* overall average for tanks where the Av went into V4 on that steep downhill most of the time versus tanks where it spent most of the time in V8 mode.   My Guess: It's been rumored elsewhere that there's some sort of coasting fuel cutoff (really, not completely cutoff, but only enough to keep the engine going). Mainly because the engine doesn't need to do anything to keep the vehicle moving. It appears that V4 mode doesn't use this, while V8 mode does, at least on downhill slopes. Result: V8 mode with the cutoff's lower fueling actually takes less gas than V4's four cylinders getting fueled more normally..   On more level ground, where the engine actually has to push to maintain the speed, V4 and V8 modes do as expected, with V4 being better than V8.   Personally, I'd rather see it get the mild hybrid system added to the existing setup, and allow it to use it not only for situations where the vehicle's stopped in traffic, but also for any real downhill coasting (use regenerative breaking too for the battery, since it's free). After all, *really* shutting off the engine in that situation should best even the V8 fuel cutout scenario (assuming it's true).

Messages Page 248 of 313 1 ... 245 246 247 248 249 250 251 ... 313 Prev Next Last

Go To Msg # Search This Discussion

You are here: Forums SUVs Chevrolet Suburban & Tahoe 2007 and newer Chevrolet Tahoe and GMC Yukon