- #877 of 3125
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Re: Leaking air and tail light gap...... [07tahoeguy]
by jay_24
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Apr 24, 2006 (10:34 am)
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Replying to: 07tahoeguy (Apr 24, 2006 8:48 am)
If you don't have the system set to recirculate, where does the air go? It has to leak out some where or blow-up like a balloon. Even on re-circulate I bet some fresh air is brought in.
I've always wondered where the air went out. guess I know now.
--jay
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- #878 of 3125
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Re: Tahoe MPG [shawnhackett]
by bodi77
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Apr 24, 2006 (3:09 pm)
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Replying to: shawnhackett (Apr 19, 2006 11:57 am)
93 octane is a total waste of money, not just because it cost more, but because your tahoe wont run as well. The higher the octane the, the lower the energy the gas has. High octane gas us used to slow down the ignition in your cylinders. The slower the ignition the less power you have. The reason high end cars require high octane is because the run at a higher compression ratio and a quicker ignition will damage the pistons and rings. The higher octane is used to prevent detonation.
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- #879 of 3125
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Cold Air Intake
by junglegeorge
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Apr 25, 2006 (12:59 pm)
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Does anybody have any experience with these, do they effect MPG? Prices seam to range from $180 - $300. Any feedback would be greatly appreciated.
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- #880 of 3125
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Re: Cold Air Intake [junglegeorge]
by tidester HOST
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Apr 25, 2006 (1:18 pm)
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Replying to: junglegeorge (Apr 25, 2006 12:59 pm)
I don't have any experience with Cold Air Intakes but my understanding of them is that you can achieve improved mileage only if you do not use the enhanced horsepower they are supposed to provide.
Anyone know for sure?
tidester, host
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- #881 of 3125
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Re: Cold Air Intake [tidester]
by awf_axis
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Apr 25, 2006 (2:25 pm)
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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
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- #882 of 3125
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Re: Leaking air and tail light gap...... [07tahoeguy]
by 73shark
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Apr 25, 2006 (4:45 pm)
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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.
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- #883 of 3125
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More ponies?
by adjmcloon
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Apr 25, 2006 (5:34 pm)
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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?
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- #884 of 3125
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Re: Tahoe MPG [bodi77]
by 06lly
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Apr 26, 2006 (7:54 am)
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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.
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- #885 of 3125
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Re: Ordered 07 Tahoe [stakeout]
by tdoh
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Apr 26, 2006 (12:20 pm)
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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.
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- #886 of 3125
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Re: Cold Air Intake [awf_axis]
by tdoh
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Apr 26, 2006 (1:10 pm)
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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.
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