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HummerGuy -> RE: H3 Hummer Perormance Intakes Systems (3/10/2008 11:41:47 AM)
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I'm going to try to be as thorough with this as I can.
I've been testing this system for Doc for about 3 weeks already, and it's quite impressive once the computer adjusts to it.
Overall: On the 3.5L I5, the engine runs considerably smoother, especially at higher RPMs. Once you get above 4k RPMs, where-as before the engine would be vibrating and gasping for air, it's just as smooth as it is at the lower RPMs.
Performance: There is more torque at lower RPMs then there was before. The torque kicks in around 1.5k RPMs and stays consitant all the way up to 6k. This is probably the most impressive change I've noticed. Before, the acceleration curve slowed down after 4.5k or so, but now it feels as if there is the same rate or amount of power throughout the spectrum, meaning that you don't feel the H3 slow down at higher RPM's as you used to. Now that it's getting enough air, it seems to have fixed this.
Sound: Again with the engine vibrations; I switched from 87 octane to 93 a while back which made the engine smoother and vibrate less when idling. For testing purposes, I switched back to 87 octane a week or two before I installed the kit, and noticed the engine was running a little rough again, or normal for most people. Once I installed the kit, it was running smooth. This means it's also much quieter. I noticed that right away. When you are driving you hear much less of the engine then you did before. In MY H3, I would say the engine noise level has gone down at least 30 to 40%. It's quieter in the garage, quieter on the street and definitely quieter on the highway.
Acceleration: Again, it's quicker. It's not leaps and bounds though, but keep in mind, I do have the PCMforLess tune, so that may have something to do with my results, but I already had a K&N filter so it was for the most part already adjusted to higher air flow. There is a change in acceleration. I'm a bit lead-footed these days because of it. You can't help but want to punch it when the engine doesn't struggle anymore at the higher RPM's. It's definitely faster. I can't really give you an estimate at how much faster since I drive the 5-speed, but it's there. There's less of a delay when you hit the gas then there was before either.
Mileage: I'm still figuring that out. I burned through the first couple of tanks flooring it everytime, so I was a little carried away with the extra power, but I needed to test it to see what changes there were, and especially after noticing the upper RPM differences, wanted to keep going to see how far it could go. I will tell you all this though; I emailed Doc and told him the mileage seemed to be about the same, but then realized I had been driving with my defogger/recirculate on most of the time I was testing it, so I got almost the same mileage with it turned on that I did with it off and the original equipment. Right now, I'm testing my first tank of gas under normal conditions for me, which is 30+ degrees, highway driving with the vent open. I'll let you all know what I find. So far, I think it's better, but not sure how much until I run another tank or two and can record my calculations correctly and figure out exaclty how much more I'm getting. I should know that by this weekend hopefully.
Installation: Pretty easy actually. For those of you who know how to do this stuff, you probably won't need the manual, but I HIGHLY recommend it for the simple fact of getting the three different clamp sizes in the right places. The directions are VERY specific, so you may have to read a few times what to do, but I gave him some pointers on tweaking them so the novice can understand it better. I think between my feedback and his changes they are right on the money.
So, overall I would say it
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