Ok, well....here we go. This is
all meant to be productively helpful.
"This is interesting as there's a following of UGR that runs NO airfilters as they say it's a 50rwhp loss with the best cone filters and plumbing at 900rwhp."
Perhaps at 900hp...perhaps. But, this thread was started by a guy that had a very real question "how far should I push my pre throttle body air system. The answer is still the same, with smooth tubes and high flow filters...the man is done.
Smooth tubes make 10 hp and nothing else helps? Most posts here say that "GREEN" filters are significantly better than K&Ns.
Smooth tubes and high flows, not "nothing else". He is done. Green, yellow, pink or just his K&Ns it all the same...ZERO difference, high flow and done. He should not throw out his K&Ns for Green as, until somebody shows up here with factual data that reveals more than .002HP its all the same.
Vipeair supposedly makes significant hp over stock because it is open to the rad front air. It also makes higher hp numbers when the Roe front fascia scoop is installed, 'reportedly'.
I said "except perhaps colder air" in my first paragraph. I was refering to two important but UNPROVEN on a stock engine mods...the VIPAIR and the JMB cold air system I run.
One of the best loggers out there, Steve, believes his Vipair helps...on a cold morning...in the first 8 minutes of his supercharged rig....before heat soad sets in. I belive the JMB unit, that feeds air from infron of the radiator may help too. As for the Roe fascia, cooler engine...yes. Higher HP on a stock engine? Show me the numbers..that is a one way mod (cutting up your Viper) he should not do it until the numbers show him its worth it.
The Gen 2 Naca duct was too restrictive so that was changed when the hp was upgraded to over 500hp with the Gen 3s.
GenII is what the man has and his Naca works perfectly...add the smooth tubes and high flows and he eliminates the EPA required parts that slowed the air down. He does not have 500 GENIII, he does not need anything more.
My thoughts are that since K&Ns and smooth tubes increase hp and the NACA duct was dumped for stock engines ... The much higher surface area of cone filters adds power (even when slightly dirty). Larger Throttle Bodies add hp so a larger, smoother air track before the TBs should be added when hp goes past 500hp. Since the Gen 2 scoop was dropped for teh Gen 3 I'd open the airbox before 500hp to **** cold high pressure air in front of the rad.
Now this one is important. There is no "higher surface area" that is goping to help once the air hits the tubes. I've spent a boat load of $ modifying my rig and making it run perfectly. I'm a mod advocate. I try very hard to refrain answering a guys question like you just did. You and I need to help these guys forward by making sure they PLAN. He does not have larger throttle bodies, he does not have 500 hp, or a supercharger. He does not have an airflow issue with his current set-up. He just wants to know can his engine efficiently make Lambda without any air drag effect...his answer is yes...smooth tubes and high flows.
I have large dual cone filters, 3" smooth pipeing, larger TB,s, radfront air intake opening on my Macedo/M2 airfilter intake system. It was expensive, but Larry M. put a lot of time and effort into testing what makes power and designing my airbox - before Vipeair.
Larry M...time and testing....perfect...numbers please?
I spoke to Sean and Joe D and JMB and a host of other guys all of them knowing I was buying and would be logging and testing and logging and testing and they all said the same thing. There would be no meaningful Horsepower gain on a stock engine that already had smooth tubes and high flows and then had a fancy air box swapped out.
Let me be clear here....Z-E-R-O meaningful HP improvement....as in NONE, NULL, 0,etc.
There are GREAT reasons to move forward with heavy mod engines...HEAVY mod engines.
A 5lbs pulley...not needed. An 8 lbs pulley...not needed. HEAVY mod startes at 10 lbs.
Call Larry Macedo or Sean at Roe Racing since there seems to be a difference in opinion - talk to an expert on the subject.
Please do....but dont just call them to ask them about an airbox...call them and plan out a great engine buildout. Call them and ask them things like "would you supercharge my engine or turbo charge it?" or "Would you use positive induction or heads and cams?" or "what can I expect if I was to get a better tune out of my stock engine with an engine management system?" or "How do you feel about using NO2?" or "how can I effectively spend $2k"....just consider something more than....airbox. You have your correct answer on that one...
Oh yea....guess what I have sitting on my shelf..my old smooth tube and high flow filter set...plan...don't let it happen to you.
Lastly, go to the illustrated section...I did a long piece on this JMB airbox...and in that piece I start out saying the truth of it:
":Why do it? Why take a perfectly good air box and swap it out? The facts are that with quality high flow filters and smooth tubes, the stock air box delivers all the air a set of stock throttle bodies require. Even when one is running a supercharged Roe system (lower pounds) high flow filter and smooth tubes make the stock air box a great match. The stock air box also has some other nice features, it fits like…well,stock, handles rain water and has a nice place to attach all the other stock breather lines that we require. Bust out the rain baffle? Well, the technique of removing the rain baffle adds little if any usable air flow and takes away…rain protection. So…why do it? I was hoping you would ask that….".
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