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2007 and newer Chevrolet Tahoe and GMC Yukon

3125 messages,  Last post on Nov 27, 2009 at 6:32 PM

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#881 of 3125 Re: Cold Air Intake [tidester] by awf_axis Apr 25, 2006 (2:25 pm)
Replying to: tidester (Apr 25, 2006 1:18 pm) If you believe "Truckin" magazine, they took a 2007 Tahoe, with the 5.3 engine, and achieved increased HP on the Dyno. Sorry, don't have the numbers with me, but it was double digits.   It's in this months issue, which includes the McGaughys 2007 Tahoe lowering kit install "how to".   Dave Replies to this message: tdoh (Apr 26, 2006 1:10 pm) junglegeorge (Apr 27, 2006 4:09 am)
#882 of 3125 Re: Leaking air and tail light gap...... [07tahoeguy] by 73shark Apr 25, 2006 (4:45 pm)
Replying to: 07tahoeguy (Apr 24, 2006 8:48 am) Older GM cars had a vent on the lower rear door pillar that allowed the internal overpressure to equalize. Not sure where they currently vent at.
#883 of 3125 More ponies? by adjmcloon Apr 25, 2006 (5:34 pm)
I'm curious about the AEM intake. Although my '07 is better than the '00 was power-wise, it still could stand a little more pep. Does anyone know of any custom ECM's or programmers available for the 2007 models yet?
#884 of 3125 Re: Tahoe MPG [bodi77] by 06lly Apr 26, 2006 (7:54 am)
Replying to: bodi77 (Apr 24, 2006 3:09 pm) Hold the phone there Mr. Bodi. You are exactly right about the higher octane being needed for higher compression ratio, but your off track a little with the "slowing down the ignition" bit. The higher octane actually delays the ignition rather than slow it down. High octane fuel does not have less energy than low octane. The purpose of delaying the ignition is to avoid any pre-ignition that causes pinging.   With these modern engines, the engine modules are constantly trying to advance the ignition to get the most out of whatever fuel you are using. Then, when some preignition is detected, it backs the timing off a bit to avoid the pinging.   By running high octane fuel, you get the most out of your engine both in performance and efficiency. Problem is, it is not hardly enough to notice unless you do some very careful and elaborate testing. And it is not enough to justify the higher cost.   So, if you are looking to save $$, the best bet is run the lowest octane that your engine will let you get away with. Then take it easy on the throttle if there is any hint of pinging. The pinging is not good for the engine.   If your goal is to beat the other guy away from the stoplight, go with the highest octane. You will have a few more ponies but less dollars to spend on beer.
#885 of 3125 Re: Ordered 07 Tahoe [stakeout] by tdoh Apr 26, 2006 (12:20 pm)
Replying to: stakeout (Apr 07, 2006 2:19 pm) How true!!! Just like in the old days--before car manufacturers started to offer "real" vehicle start immobilizers, they were pushing that Loctronics cr*p. Heck, my brother (he runs an auto accessories shop) told me of how he was able to get one of his customers--who was there to get an aftermarket alarm installed in her vehicle--to make the dealer give her a refund on the Loctronics that was installed in her vehicle by instructing her to show the dealer how easy it was to bypass it w/ just a paperclip, thus negating the need for that "special" Loctronics chip you had to stick in the unit before starting the vehicle.   But yeah, none of that "special" after-the-fact paint sealant for me; and especially for as much as some dealers offer it for...if I had to choose between spending that much money on paint sealant vs. allocating it towards an extended warranty (not that one would necessarily need to get one)...the choice is obvious.
#886 of 3125 Re: Cold Air Intake [awf_axis] by tdoh Apr 26, 2006 (1:10 pm)
Replying to: awf_axis (Apr 25, 2006 2:25 pm) Keep in mind that when such numbers are posted, they're typically max HP figures...rather than the gain across the entire powerband. Example--a CAI w/ an "advertised" HP gain of say, 10 HP...what the manufacturer more often than not won't tell you up front is that that 10 HP gain was at a particular engine rpm--usually in the higher limits (relatively speaking, depending on engine redline). Many of these CAIs--and other aftermarket automotive performance products--will not produce those high-number gains where it really matters most...in the 2000-3000 rpm range. Wouldn't be surprised if the HP gains in the 2000-rpm band amount to maybe 3-4 HP at most. Think about it--how many consumer-oriented (i.e., street-legal) CAIs can produce dyno-proven high double-digit HP gains from 0-to-redline? NONE!!!!!   Not to say that CAIs are a complete waste of money, but don't get too swayed by those HP-gain figures...like I said, they represent max gain at a particular point in the powerband. Replies to this message: junglegeorge (Apr 27, 2006 4:09 am)
#887 of 3125 2007 Yukon - 1K report by davidbever Apr 26, 2006 (6:48 pm)
I've now got 1K miles on my new fully equiped Yukon - here is the results:   1. Drives much better than my 2002 Yukon 2. Rear camera boots too slow after start to be effective 3. One tire pressure monitor reads 8lbs low - causes idiot light when cold 4. Electric rear door and rear seats are a big waste - car wash guys can't figure out how to open rear, motors under seat take up too much room. 5. With rear seats removed, remaining tracks don't allow things to lay flat 6. Middle row seats aren't removeable, and may get in the way of larger items 7. Nav and radio system are a pain to use when driving - too many features blocked when moving 8. Nav warning screen is really annoying 9. V8/V4 seems to work well - concerned with future performance 10. Battery voltage indicator seems to randomly be between 10 or 14volts - no correlation to the real voltage 11. Nav system - when using to guide you, provides split screen with map and list of next offramps - no way to turn off list and just display map (too small to use) 12. Impressed with Nav details and accuracy in town, but not impressed with ability to find shortest route (from LA to Big Bear - wanted to take me 100miles out of the way - not even close to right) Replies to this message: bigjohn101 (Apr 26, 2006 9:05 pm) jerrywimer (Apr 27, 2006 3:36 am) justamom2 (Apr 27, 2006 5:49 am)
#888 of 3125 Re: 2007 Yukon - 1K report [davidbever] by bigjohn101 Apr 26, 2006 (9:05 pm)
Replying to: davidbever (Apr 26, 2006 6:48 pm) More info about item #10: Battery volt gauge -- It's accurate. GM is using a newer type of alternator and/or voltage regulator! .. It does have random output voltage ... AND sometimes it will turn OFF the alternator output voltage totally if it senses that the battery is fully charged. .. At those times you are running on battery power only .. Why?? .. less load on the engine .. More fuel mileage!! ---   More about fuel mileage .. With the DIC turned to instant fuel mileage .. watch the readout when the AC is cycled ON then OFF. .. It uses a lot more HP than you think! ---   Item #9: The heart of the new V8/V4 system is the lifters! .. For future performance & long engine life there is nothing more important than changing your oil! ---   Item #4: Power rear door .. IMHO it's great! ---   Item #6: For larger items .. I have been using various size trailers & types for years! .. It saves a lot of wear & tear from being put on your vehicle. ---   Item #4: IMO .. it's better to have a larger seat motors than ones that are too small that could burn or wear out premature. ---   FYI .. I did not order the NAV, rear camera, & 3rd seats. .. BUT .. the XM SAT radio & with Bose speakers and with the steering wheel controls IS .. The best GM sound system that I ever had!!
#889 of 3125 Re: 2007 Yukon - 1K report [davidbever] by jerrywimer Apr 27, 2006 (3:36 am)
Replying to: davidbever (Apr 26, 2006 6:48 pm) And for #11, you may want to reread the Nav's instruction booklet. There were instructions for the previous nav system (2006 and earlier vehicles) to allow switching between splitscreen and fullscreen maps. Having seen salesmen at my local dealership playing with the nav in a 2007 Tahoe LTZ, I witnessed the map in fullscreen view. So there has to be a way for the new ones too. Replies to this message: justamom2 (Apr 27, 2006 5:49 am)
#890 of 3125 Re: Cold Air Intake [tdoh] by junglegeorge Apr 27, 2006 (4:09 am)
Replying to: tdoh (Apr 26, 2006 1:10 pm) Thanks for the info. I just got my hands on a copy of a recent 2007 Tahoe dyno test. Naturally, the test results were supplied by the manufacture of the CAI, although the tests were impressive, they did prove your point. The test indicated an increase of 22 HP and 28 Lb-Ft. If you study the tiny graft, you will see that most of the extra ponies are at the top of the RPM range. Looks like it is pretty much a wash until you reach 3000 RPM, then you pick up 8 HP 3500 RPM, 10 HP 4000 RPM, 18 HP 4500 RPM, and finally 22 HP 5000 RPM. I will probably still pick one up, if I can get the right price, as it will probably help with the trail load on long hills.

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