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Go Back   Hummer Forums by Elcova > Hummer H3 Discussion Forums > General H3 Discussion

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  #1  
Old 06-18-2005, 01:07 AM
Ely Ely is offline
 
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Hey guys, Happy H3's to all of you who have one.

I searched for H3 on ebay under Ebay Motors/Parts & Accessories.

I came across these two listings that claim to give great performance increase for such little money.

Let me know what you all think.

Cheers.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewIte...25591&category=38634

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewIte...95917&category=42604

Thanks guys... this site rocks.
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2006 Hummer H3 LUX/ADVENTURE in Black with Ebony/Morrocco interior: Black Grill, Black Brushguard, Marker roof lamps, QUAD exhaust, back up camera, Splashguards

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  #2  
Old 06-18-2005, 01:07 AM
Ely Ely is offline
 
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Location: Los Angeles
Posts: 94
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Hey guys, Happy H3's to all of you who have one.

I searched for H3 on ebay under Ebay Motors/Parts & Accessories.

I came across these two listings that claim to give great performance increase for such little money.

Let me know what you all think.

Cheers.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewIte...25591&category=38634

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewIte...95917&category=42604

Thanks guys... this site rocks.
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2006 Hummer H3 LUX/ADVENTURE in Black with Ebony/Morrocco interior: Black Grill, Black Brushguard, Marker roof lamps, QUAD exhaust, back up camera, Splashguards

http://i7.photobucket.com/albums/y26...o/DSC00877.jpg

[img]http://i7.
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  #3  
Old 06-18-2005, 01:16 AM
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bparker bparker is offline
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Both are total crap. Dont buy into them.
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  #4  
Old 06-18-2005, 01:21 AM
H3 Buyer to be? H3 Buyer to be? is offline
 
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If I could make a loud farting noise by typing into this space, I would have done that instead...
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  #5  
Old 06-18-2005, 01:34 AM
DeLeon DeLeon is offline
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I'm not saying those "performance accessories" are good, but I ask my self.. WHY DO THEY GET SUTCH GOOD FEEDBACK?? for 20 bucks I think I'd try it, but I don't know if I'd damage the engine somehow...
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  #6  
Old 06-18-2005, 02:15 AM
Induction Concepts Induction Concepts is offline
 
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H3 Buyer to be: Hahahaha.

Ely: They won't damage anything. They won't help performance, if anything, they will hurt performance because they are an added restriction in the air stream between the filter and intake valve. That swirl just doesn't work there. It will work in some head designs, because it's a short distance into the cylinder and its not a dramatic shape or set of fins like that ebay thing. But that far away from the valve, its only a restriction. Now there is a way of using a grid shape, not a screen, well think of a screen 1/2" thick (some of them are a couple of inches thick). They usually use a honeycomb shape. The new '05 Mustangs have this in the inlet tube after the air filter, looks like its made out of paper. I have heard of those cars actually losing power when you remove that. What it does is straighten the air stream out, making it less turbulent. The actual purpose is to absorb fuel vapors that kind of backwash out of the engine through the intake tract when the engine is turned off. It's a very small amount and only happens when the ignition is turned off and an injector will be spraying at that millisecond and the intake valve is still open, the exhaust valve is still closed, so the heated air from the cylinder travels back out of the intake, throttle body and towards the air filter. So its there for emissions reasons, but does actually have a performance benefit.

There is a company that makes these honeycomb pieces out of aluminum and they press them into the turbocharger inlet on Diesel trucks for this same 'air straightening' reason. But for the $5 worth of honeycomb they use, they want a small fortune for the part.

If something like that ebay thing actually worked, every car would have one from the factory. Every auto manufacturer wants to have the highest mpg possible, often sacrificing performance to get a higher mpg. With this device they could have both...if it worked.

I would hazard a guess that the sellers good ratings are because the people that buy these types of things don't know any better, so they never know if it helps or not. They *think* it must have made an improvement, so therefore it did.

Some ebay sellers have been known to setup multiple ids (or use friends and family) and buy things from themselves so they can have a high rating. Always use caution when purchasing from ebay. Buyer beware. You did the right thing to ask questions from others. It will often save you money and heartache.

Here's how their $20 item increases your performance and mpg: Your wallet is $20 lighter. Less weight means faster acceleration and better mpg because of an improved power-to-weight ratio.
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  #7  
Old 06-19-2005, 07:38 AM
Ely Ely is offline
 
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haha I had a great laugh from reading the end of that induction... I was almost fooled by the feedback, but I realize how sellers get everyone they know to leave them feedback... Also, you're right about how every car would have it from the start if it helped as much as they said it does.

By the way, I called up a Muffler guy and asked him if he had an exhaust system for the H3.. he said he could "make one" and install it for 300 bucks. Would that be a reliable system? durable? longlasting? actually make a difference? Why is it so much cheaper than the exhaust systems that I see on these websites for about 1000? Shouldn't a custom system be more than that?

Thanks.
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2006 Hummer H3 LUX/ADVENTURE in Black with Ebony/Morrocco interior: Black Grill, Black Brushguard, Marker roof lamps, QUAD exhaust, back up camera, Splashguards

http://i7.photobucket.com/albums/y26...o/DSC00877.jpg

[img]http://i7.
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  #8  
Old 06-19-2005, 09:13 PM
Induction Concepts Induction Concepts is offline
 
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I have no way of knowing if it would be reliable, durable and long lasting. Depends on what its made out of and how he builds it. Muffler shops typically use compression bending, so they collapse the pipe to make a bend. Its pretty cheap, but does create a restriction because the round shape of the pipe is deformed. But if he goes up in pipe size, it may offset those restrictions.

If he builds it out of aluminized mild steel, it should be pretty durable. It's not stainless, but that coating really cuts down on the rust. Almost all muffler shops use that type of metal now.

The price is about right. In smaller towns, local muffler shops can build a full, true dual exaust for $100-200 plus the cost of whatever mufflers you choose.

The expensive exhausts you see are built with very expensive mandrel bending equipment. They actually stretch the pipe and have a mandrel inside that is pulled through the inside of the tubing while it is bent. This supports the inside and keeps it from collapsing or deforming. This is the best for optimum flow, but it does come with a price. Also many of the aftermarket exhausts are made out of stainless which varies from $7-10 per foot for the raw material alone. Of course they can get it cheaper when they buy hundreds or thousands of feet at a time like the major players do.

I haven't seen a factory exhaust on an H3 yet, so I don't know if an aftermarket exhaust will provide much benefit. The factories are starting to put better and better exhausts on. I have seen full stainless exhausts, with mandrel bends from the factory. Its hard to improve on that, at least until a major increase in power is added and you need to go to a larger size of tubing.

Most aftermarket exhausts don't provide a noticable increase in power. You may get 15-20hp or so, but this is rarely something you can really feel by the seat-of-the-pants meter. You can usually hear it, so it appears to be faster.

Most common bolt-ons claim a certain hp improvement. They are getting more realistic now since magazines and shops have tested them and called their bluff. But something that often happens is that someone will buy several of these items, like headers, underdrive pulleys, cold air kit, different mufflers, aftermarket intake manifold, maybe an x/h pipe, etc. If you add all of the claims up for each of these things, it will look like a pretty decent improvement. The problem is that all of them don't add together in the real world. You'd be lucky to get half what they claim when they are all used together.

A few years ago, when software first started becoming very large and using a lot of memory, it took many seconds for a program to load, this made it seem painfully slow. So software developers started making 'flash screens', that pop up immediately, to give you something to look at, while the main program is loading in the background. It still takes just as long to load. So the program 'appears' to be much quicker because the flash screen loads so fast. Its all about perception.

Unfortunately any real performance improvement costs money. The things you want to focus on are getting air into and out of the engine, to make the engine more efficient.

If you add up all of the costs for these bolt-ons, it will really start to add up. For all the money spent, the jump to a supercharger or something isn't that far of a leap. At least then you are talking about improvements you can feel. The problem is that in one chunk, a supercharger is expensive, where the bolt-on path can be done gradually and less financially painful.

I know it probably sounds funny for a turbo guy to recommend a supercharger, but turbos aren't the perfect solution for every application or budget.
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