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  #169  
Old 12-30-2011, 09:12 PM
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Re: Volant CAI

No just drove it hard.
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  #170  
Old 12-30-2011, 10:54 PM
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Re: Volant CAI

So bottom line does it add any power or is it just eye and ear candy? Sorry but I don't feel like reading 15 pages and I mean not seat of the pants but real measured power. Thx
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  #171  
Old 12-31-2011, 12:01 AM
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Angry Re: Volant CAI

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Originally Posted by JRoll1ns View Post
The stock intake per terminator2 flows 580 cfm. At standard temperature and pressure 32* @ 14.5 psi (sea level) spinning at 5800 rpm (factory red line) the Hemi needs 578.99 CFM. So it appears to me that unless one raises the operating RPM or increases the volumetric efficiency then we are all just really wasting our money. I believe that the hemi's true upper limit operating range is between 6300 (conservative) and 6800 rpm. I came to the conclusion of this by doing some simple auto math based off of the components the engine is made of. I believe that if the Hemi's piston speed is kept between 3800 fpm and 4000 fpm then the engine should not let go. I do believe that running piston speeds over 3800 fpm will cause premature wear on the motor. If we take (3800fpm x6)/ stroke 3.58 = 6368RPM (4000fpm x6)/stroke 3.58=6703 RPM.
At 6368 RPM the Hemi will require 635.69 CFM and at 6703 RPM the Hemi will require 669.22 CFM @ standard temp and pressure an increase in 56.7 CFM and 90.2 CFM respectivly . My point is this. Until the codes are cracked and we can raise the rpm limit to the Hemi's true performance limts instead of being stuck with the ultra conservative factory limits. Than we are all wasting our money including myself with the K&N style Drop in filter. Now this is all based off of top end performance.

There is however a potential for across the board performance increases at lower RPM's due to the after market CAI tubes being less restrictive at lower rpm levels. So again unless your increasing the operating rpm or increasing volumetric efficiency you don't need more CFM you just need a smoother path to deliver the CFM. This is why a lot of guys running drop ins do not feel any performance change unless they have made some other mod like a chip, and why guys with bone stock systems feel a change in performance with the CAI.
Quote:
Originally Posted by JRoll1ns View Post
My numbers do not account for things like scavenging. My CFM numbers are purely based on the maximum theoretical volumetric capacity of the engine at a given RPM. The 5.7L in our Jeeps is still a street engine, albeit a damn good one, but its still a street engine. with that said, a N/A 5.7L Hemi still only has a Volumetric Efficiency of somewhere around 90%. We are not talking about full on race motors that can have actual VE numbers above 100%, so the theoretical numbers are the max amount of CFM's the engine can move. The formula for CFM in an engine at a given RPM is as follows

CFM= (RPM x DISPLACEMENT)/3456


On to Velocity.
you are very correct in the fact that nobody on these forums hardly ever consider velocity when talking about air intakes. One reason is that it is damn near impossible to figure velocity on a stock intake tube without a flow bench. This is due to all the different baffles and such that you pointed out earlier. However, figuring velocity on a CAI tube is very easy. To show every one the difference in velocity of air flow from the stock tube to the Volant, I will use the 3" tube as the stock air tube sense that is the size of the throttle body and the stock air box connection. The Volant tube size is 4.5 inches.

The formual for finding velocity with a known CFM is as follows V= CFM/Area.

We have already established that the CFM at 5800 RPM on our HEMI is 578.99. The area of a 3" pipe is .052 square ft.

578.99CFM/.052 sqft =11134.42 ft per minute

With the 4.5" Volant the area is .11 sqft

578.99CFM/ .11 sqft =5263.54 ft per minute

Because the Volant goes from the slower velocity of the 4.5" tube to the high velocity of the 3" tube at the throttle body, there would naturally be some scavenging effect there.

More important than the velocity, and I think this is what you were getting at earlier, is the fact that if there is one thing engines hate it is turbulence. Removing turbulence improves flow (don't confuse flow with volume or velocity) and improved flow allows the right pieces to fall in place so that the volumetric efficiency can begin to increase. Once the VE increases then more fuel can be added and more power is made. You are very right in the fact that a lot of people get caught up in the thought that they just need to get the engine more air, more volume. They don't understand that it takes a combination of volume, velocity and flow to increase VE and ultimately increase power. This is why manufacturers such as Volant and K&N and others usually retain the stock air inlet location such as the snorkel on the WK2 or a hole in a fender on other makes and models. These manufacturers know that they are not going to free up a lot of top end HP because the engine is already able to take all the volume of air it needs at red line. What they do know is that they can free up a lot of low and mid range power by improving the flow characteristics and scavenging effects of the stock intake.

Had you read at least the first page you would have found posts like these explaining things
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  #172  
Old 01-02-2012, 01:27 PM
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Re: Volant CAI

Just placed my order in time for a road trip this weekend. Hoping to see some MPG improvement. Will let everyone know what the verdict is.
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  #173  
Old 01-04-2012, 01:20 PM
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Re: Volant CAI

I ordered the Mopar CAI, yesterday. Then last night I joined jeepgarage.org. I read through all 15 pages of this thread and realized I should of joined this site sooner. I cancelled my Mopar this morning and ordered my Volant. It will be here tomorrow!
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  #174  
Old 01-04-2012, 02:47 PM
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Re: Volant CAI

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Originally Posted by Pkane3 View Post
I ordered the Mopar CAI, yesterday. Then last night I joined jeepgarage.org. I read through all 15 pages of this thread and realized I should of joined this site sooner. I cancelled my Mopar this morning and ordered my Volant. It will be here tomorrow!
Congrats! and Welcome!
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  #175  
Old 01-04-2012, 03:25 PM
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Re: Volant CAI

so far i've had the volant installed for 2-3 weeks. sounds best at WOT like most have posted, and I do notice better throttle response. Not much difference on mpg. very pleased with this investment.
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  #176  
Old 01-06-2012, 02:22 AM
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Re: Volant CAI

After a tank of fuel the ECU or whatever has adjusted now and the immediate performance changes are not as noticeable. My flat spot is back between 1st and 2nd gear change under WOT. I guess that proves that the system will adjust to restore A/F ratios etc... Can't wait for a chip.
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  #177  
Old 01-10-2012, 02:11 PM
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Re: Volant CAI

REVIEW

INSTALL - As everyone has stated, directions suck. Good thing is its a simple install and can be figured out easily. Just a few gripes. 1. The rubber grommet in which the temp sensor is inserted is a bit of a pain. As you insert the sensor the grommet gets pushed into the intake. To make it easier i used natures vaseline (spit) and it made it a tad easier to slide in the sensor. I wasn't sure how far to insert it, but i went to the sensors rubber o-ring. 2. The filter comes packaged separate from the air box. Its a pain to tighten the clamp in the air box, especially if you have large hands. To make it easier i snugged down the clamp before placing it in the air box, or else the clamp will spin. Then used a socket driver to tighten. 3. L-bracket on air box difficult to tighten. Directions particularly suck in this area. No easy fix here, just placed the bracket in every which direction until i got it to fit.

PERFORMANCE - WHOLY COW! I swear im driving a new truck! Now that i got that out of the way, let me clarify. Response definitely improved but not tremendously, not sure about improvement in MPG, haven't driven enough yet. The biggest difference is in WOT sound. This thing is an animal. I scared myself the first time i mashed on the gas. I still have a silly grin on my face. I'm not sure if i'm moving faster, but it sure sounds like it.

I hope this help some people that and on the fence about this product. Overall, money well spent.
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  #178  
Old 01-10-2012, 04:33 PM
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Where is this available at its cheapest atm? Are there any special offers on?

Edit: also, will these fit on my12 hemis? I'm assuming there is no difference?
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  #179  
Old 01-10-2012, 05:13 PM
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Re: Volant CAI

I agree with all your points, gokart. I installed mine last night and had the same gripes.
The filter install into air box is much easier if you rotate the hose clamp around to where you can stick the screw driver or socket in through the intake hole.
Before I did the install I have been tracking my mpg over the previous three mornings for my trip to work using the car's computer. The trip is 40 miles and I been using cruise control at the same speeds everyday to ensure I can be as consistent as possible. Temperatures have been within 3 degrees outside. Over those three days, the computer has been very consistent and produced an average of 18.7 mpg. This morning, temperatures were a bit colder with at about 6 degrees Fahrenheit colder than my previous trips, but my mpg came out to 19.4. I plan to track over the next two mornings to see what happens as well as revisit this in a week to see how the computer adjusts and effects the results. I was actually a pretty shocked at the gain this morning, but not going to get excited until I see the same results in a week or two.
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Old 01-10-2012, 05:37 PM
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Re: Volant CAI

Quote:
Originally Posted by Hemidog View Post
I agree with all your points, gokart. I installed mine last night and had the same gripes.
The filter install into air box is much easier if you rotate the hose clamp around to where you can stick the screw driver or socket in through the intake hole.
Before I did the install I have been tracking my mpg over the previous three mornings for my trip to work using the car's computer. The trip is 40 miles and I been using cruise control at the same speeds everyday to ensure I can be as consistent as possible. Temperatures have been within 3 degrees outside. Over those three days, the computer has been very consistent and produced an average of 18.7 mpg. This morning, temperatures were a bit colder with at about 6 degrees Fahrenheit colder than my previous trips, but my mpg came out to 19.4. I plan to track over the next two mornings to see what happens as well as revisit this in a week to see how the computer adjusts and effects the results. I was actually a pretty shocked at the gain this morning, but not going to get excited until I see the same results in a week or two.
Excellent. Please do keep us posted.
This is one thread I've been following with interest, as I'd like to add the Voland CAI in the spring.
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