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Old 04-15-2009, 06:11 PM   #1
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Default upper intake porting

ok so i read a artical on here about some "homemade" hv3 they basically cut some large square holes in the runners about a inch up from each of the runner base'* but i guess they had issues and left here. so my question anyone tried this thats still here? what were the results if so. if not do you see problems with it advantages etc?
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Old 04-16-2009, 10:19 AM   #2
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come on no responses thoughts etc dont act like you arent interested
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Old 04-16-2009, 12:38 PM   #3
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Sorry, I can't help you in this area. If you want to port teh LIM outlets, that I can help with.
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Old 04-18-2009, 01:14 AM   #4
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Having higher velocity air is cool, but cutting holes in plastic does not particularly seem to be a good way to increase volumetric efficiency. As I'm aware, the HV3 actually has longer runners. This means no added holes and further pushed up OE-sized holes.

I remember this idea was actually shot down because some big shot came by and said the holes need to get larger toward the back. This is actually not true, and said big shot went against this to try to prove me wrong when I thought cylinders 1 & 2 benefited most from greater air velocity. There'* lots of weird information out there, but here'* one thing that works: Cut holes because your car will still run and get more power, but then document in which RPM range you find power and try again if necessary.
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Old 04-20-2009, 07:48 PM   #5
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im not fully understanding your post. you started off by saying cutting isnt a good idea then said to cut and try again can you clarify what your meaning im sorry
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Old 04-20-2009, 08:35 PM   #6
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Longer runners give you more low end power, and shorter runners give you more high end power. The HV3 should have shorter runners, but I talked to ZZP about it over the phone and they were kind of unclear on the design and even stated that it'* bigger than OE. I think holes cut into the UIM insert would work really well with a better flowing throttle body to help to up the manifold pressure.

Overall, I believe we should have even longer runners. The 3800 intake manifold seems to be very small in comparison to other manfiolds, and shortening the runners even more may work against where the 3800'* true power lies. It'* not that it'* bad for the engine, but you're simply shifting the power band to an RPM range that may not feel ideal.

From talking on the phone and in person with a few people who have 400 & 500 HP 3800s, places like PRJ Performance and ZZP, I am still unsure about if the effects of the HV3. Ultimately, I think it'* unnecessary. That being said, I assure you that cutting holes in the insert will change something for the better. What exactly is changed isn't clear to me, and that'* why you can experiment if you want. Your engine will behave differently, and you will likely have more power higher up in the RPM range.

Looking over all that, I may not have clarified ideally. Please let me know if anything else seems confusing.
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