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Custom Dodge Ram Performance Mods - Engine - 4.7 Liter V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 4.7-liter V8 engine - 310 horsepower, 330 lb-ft of torque.


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  #1  
Old 07-22-2010, 12:59 AM
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Default A few mods and still no gains.

Ok, so I posted previously about headers and exhaust systems, that is my next project. But here's the deal. Everything in my 06 4.7 4x4 is stock except the CAI from Volant. I added that a few months ago and saw -0- improvment with MPG and VERY little to throttle response. So then I changed out the 8 sparkplugs as they had 50k on them. While I was in there I also did a complete sea foam treatment (1 can in gas tank, 1/2 can in vacumme line, 1/2 tank in crank case and changed oil 100 miles later with Mobil 1 syn). Now I use gasbuddy.com to log ALL my fuel purchases and I am still showing no improvement in MPG and to tell you the truth I don't feel any throttle response, if anything it sounds like the engine bogs down sometimes. Now recently the weather has be ungodly hot (95*+ w/108* HI) but before this weather I still wasn't getting much. I don't expect 4mpg increase as Volant states on thier box but maybe at least 1.5 would be nice. I keep the air pressure constant in all 4 tires, she's clean as a whistle I don't tow or haul anything, what gives? I was thinking of either trying a fuel injector cleaner or putting a tank of 89 grade fuel in (91 would probably give me knocks). The reason I post this is I'm a little leary about spending nearly 1k on headers and exhaust if it won't do me any good as the CAI did. Maybe I have a dodge that just has bad fuel economy and bad throttle response.

P.S. One thing did make me wonder when installing the CAI was this hose that I had to attach from the body of the main CAI tube to this "dip stick" looking rod going down towards what looks like the fire wall. You can see here just below the "Engine Oil" dip stick what tube I'm talking about:

and in this picture the hose that I had to attach to the CAI body:


Could this have anything to do with it? I doubt it but it's worth a shot.

Last edited by jayhkr; 07-22-2010 at 01:03 AM.
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  #2  
Old 07-22-2010, 09:22 AM
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That should be the fresh air inlet for the PCV system. I'd get a small breather filter and attach it to the inlet somewhere between the CAI and firewall and get rid of that ugly red hose!
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Old 07-22-2010, 09:39 AM
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One of the most misleading claims is the CAI industry. I'm not TOO familiar w/ Volant but Steeda and K&N always claim MPG Improvements UP TO 2 MPG or UP TO 15HP. That means out of 7000 dyno runs they may have seen those gains ONCE with ONE vehicle and results are def. not typical. With 50k miles I doubt running seafoam, etc will help. Also the plugs can't be too bad either. You can only get your fuel system so clean, and if it wasn't dirty then cleaning it won't help. You want MPG improvements, get a prius.
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Old 07-22-2010, 09:42 AM
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I think gains are based upon how good the factory system already was to begin with. If the system sucks (like those found on some of the old 4.0L engines) then I can see the big gains claimed by these companies. If you're comparing to a more modern, free flowing system to begin with, the gains won't be the same.
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Old 07-23-2010, 01:04 AM
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Quote:
Originally Posted by Remerson228 View Post
That should be the fresh air inlet for the PCV system. I'd get a small breather filter and attach it to the inlet somewhere between the CAI and firewall and get rid of that ugly red hose!
Yeah, that ugly red hose is what I had to get at the hardware store as the company only sent me a 6" piece of tubing. Obviously I needed longer. I've never heard of a breather filter. I'll look into that. Thank you.
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Old 07-23-2010, 11:33 PM
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The only way that you are gonna see MPG improvement is never leave the highway and stay below 2000 RPM's.
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Old 07-24-2010, 07:25 PM
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i put a custom cold air intake, cat-back exhaust, and few lil things like tuneups recently, seafoamed mine and i did notice a bg difference on my 02 ram
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Old 07-24-2010, 09:51 PM
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Quote:
Originally Posted by simply2cool View Post
The only way that you are gonna see MPG improvement is never leave the highway and stay below 2000 RPM's.
That's all I really drive, except when I have to get off the highway to get to work or home. I'd say 90% is hwy and when I'm doing 70 my rpms are at 1800. I guess 14.8mpg average is what I get to expect. (according to the last 10 fill-ups)
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Old 07-25-2010, 12:33 AM
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As a daily driver, I average 15.5 MPG. Minimal city driving, half highway(65-70mph) and half country roads(55-60mph) driving the speed limit to 5mph over. If I drive all highway I get 17.5-18 MPG. When I say keeping the RPMs below 2000, I am mainly referring 0-60mph. That is not always easy to do when you are getting on the highway and a 18 wheeler is creeping on your back door. I try to keep it below 3000 RPMS.

I havent noticed any MPG increase with my volant CAI or hypertec tuner, but it sounds and responds better. I still need an exhaust, maybe that will open it up for me. I have also read that bosch platinum plus spark plugs can help with MPG increase.

I think that the MPG increases that people see, are for their own particular driving habits. You probably just have to find the mod thats right for you and the truck.

Oh yeah, I still need to replace the hose on my CAI too. I have a couple hose's held together with zip ties.
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Old 07-25-2010, 12:55 AM
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A CAI alone is not going to do much. When you start doing other mods then thats when the CAI helps out. If you do the headers and exhaust like you were planning then you will notice it for sure. Why would you not expect to see any gains with those two mods???? Those are the best bolt ons to do!

Also a programmer will helop out as well. I think for the 4.7l the Superchips is the best one to go with. That will change your air/fuel ratio and all that other good stuff.
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