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Unread 09-15-2009, 11:27 PM   #1
ronsaun
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Mpg/hp Noticably Improved>read Post

03 grand cherokee, 4.7L(not HO) 94000 miles. just added an american parts corporation universal fit cold air intake(tossed included filter) cost $59.95, k&n 4" conical air filter $45.00 and a flowmaster 50 seriers muffler $79.95. i cut out the filter box on the intake side with a roto zip to allow for the filter and intake tube to set in it and cut out the grille side to allow more fresh air into the box. replaced the lid. this whole install took 1 hour and looks good. replaced stock muffler with the flowmaster it fit perfect with a 12" extension pipe. this took 1 hour also. the flowmaster has more cfm capability than the factory cfm at the exhaust manifold(520 cfm) the muffler has far more per flowmaster tech support. resulting in a "low" restriction exhaust. found out as well that the factory mandrell bent pipes and the cat convertor restrictions are very negligible anyway. ended up with a great hp increase(throws you back in the seat and "smokes" the tires for 100 feet) and noticably more fuel economy. following is my "test". traverse city mi. to toledo oh. 600 miles round trip flat highway. 180 miles at 60mph averaged 21.8 mpg. 420 miles at 75mph averaged 18.8 mpg. the odometer and speedometer was verified throughout the trip by my garmin 76c gps. factory mpg is 19mpg at 55mph. i feel it is a tremendous inexpensive improvement and easy to do!!!!!!!!!!!!! next i am purchasing a superchip to install the fuel economy program, calibrate for my new taller and slightly wider 70000 mile tires(harder rubber,less resistance,less revs) i have yet to purchase (235 85 16). hope to get a couple more mpg, then i am done with fuel economy unless anyone has an additional idea? by the way, i used 87 octane from speedway and bp.


Last edited by ronsaun; 01-09-2010 at 12:46 AM.. Reason: added info
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Unread 09-16-2009, 12:00 AM   #2
the88thpianoman
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Don't bother with the throttle body spacer. 100% waste of money on the 99+ intake manifold.
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Unread 09-16-2009, 05:15 AM   #3
Turbonut
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Often wondered how fuel mileage could increase when a computer keeps the F/A ratio the same before and after installation of parts. You could have a clogged air filter and the fuel mileage wouldn'd drop, but naturally performance would.
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Unread 09-16-2009, 07:40 AM   #4
rm2001wj
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Even more amazing than the mpg claim is the claim that it
Quote:
"smokes" the tires for 100 feet.
My supercharged WJ can't smoke tires for even 5 ft, but I do have Quadra-Drive. Even if I had a 2WD, I still couldn't do that.
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Unread 09-16-2009, 07:49 AM   #5
srad711
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Quote:
Originally Posted by rm2001wj View Post
Even more amazing than the mpg claim is the claim that it My supercharged WJ can't smoke tires for even 5 ft, but I do have Quadra-Drive. Even if I had a 2WD, I still couldn't do that.
A one legger 2wd 4.7 will easily smoke'm for 100ft. I've done it.
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Unread 09-16-2009, 07:58 AM   #6
99avant
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My 4.7 with a 242HD cannot smoke the tires from a stop.. I can get four or five spins on dry pavement.

Brakestands on the other hand...

And if you want better mpg, buy a honda.
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Unread 09-16-2009, 08:03 AM   #7
the88thpianoman
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Quote:
Originally Posted by 99avant View Post
My 4.7 with a 242HD cannot smoke the tires from a stop.. I can get four or five spins on dry pavement.

Brakestands on the other hand...

And if you want better mpg, buy a honda.
Probably depends largely on what type of surface you're spinning the tires on.

You pull those rear sway bar links off yet?
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Unread 09-16-2009, 08:07 AM   #8
HighLonesome
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Quote:
Originally Posted by rm2001wj View Post
My supercharged WJ can't smoke tires for even 5 ft, but I do have Quadra-Drive. Even if I had a 2WD, I still couldn't do that.
In 2wd and at sea level, my modded '94 (5.9, heads, cam, headers) will chirp them for about 10 ft. That's with rear Truetrac and 31" BFG ATs. Then she locks up with the asphalt. Poor D35

Huge difference here at 5400 ft elevation.
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Unread 09-16-2009, 09:25 AM   #9
rm2001wj
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Quote:
Originally Posted by srad711 View Post
A one legger 2wd 4.7 will easily smoke'm for 100ft. I've done it.
I'll bet you get over 25 mpg on the highway too.
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Unread 09-16-2009, 09:44 AM   #10
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I'll bet you get over 25 mpg on the highway too.
27, he put the K&N sticker in the window! Instant 2 extra MPG!
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Unread 09-16-2009, 10:22 AM   #11
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I recently made some respiratory changes to my rig and have to admit that it was a very notable difference. Unfortunately, I change a lot of components all at one time so I have no real way to compare each modification on its own. Typically, if you are going to let more in, you will not see much improvement if you dont let more out. Let us know what kind of milage you are getting after a couple of tanks of gas. I believe you definately have the potential for better mileage but at the same time you will have more throttle response and may be prone to lay into the pedal more now?

Here are the changes I made:
  • BBK PowerPlus Ported throttle body (spec'd to be 70mm but it measured at almost 75mm?)
  • K&N FIPK
  • Superchips re-program
  • Kolak MagnaFlow Catback system with a Flowmaster 50 and 3" piping
  • 4 brand new Mopar O2 sensors for the new exhaust system.
I could not believe the increase in throttle response but since I have a new motor I am still breaking it in and couldnt really step on it but there is a very noticable performance gain so as long as I can stay out of the pedal I should see some improved mileage. I will try to post up my findings after I can burn through a full tank and do a real mileage check.

Last edited by lvum4x4; 09-16-2009 at 10:33 AM..
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Unread 09-16-2009, 10:23 AM   #12
WiCkeDuDe
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I smoked my tires for 100 feet easily the other day. I wanted to try out the quadradrive diffs I installed and see how they grabbed. I held it wide open and eventually the other side kicked in. Oh did I mention it was raining
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Unread 09-16-2009, 10:45 AM   #13
UrbanOffRoad124
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x2 on the throttle body spacer. Waste of money, they make better paper weights than performance mods.

Fact of the matter is, you bought a V8 Jeep. MPG should not be your concern. I've done the same tests after changing my intake , exhaust, tire pressure, etc. It's all a placebo effect, you drive calmer when your trying to get better MPG. Here's how you save MPG, tape a block of wood under your skinny pedal!! Everything else is so negligable. You can improve MPG a little with a nice new air filter and better flowing exhaust, but not the type of difference your gonna notice at the pump. It's still $50-$60 to fill up every time and going an extra 10 miles doen't change the money coming out of your wallet.

But nice to have some new parts, and welcome to the forum.

P.S. -> Your profile shows your own a 2003 XJ Cherokee. Change that, you own a 2003 WJ Grand Cherokee.
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Unread 09-16-2009, 11:39 AM   #14
ronsaun
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my 100 ft of tire smoking is with brakestanding on dry asphalt. needed to clarify that.
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Unread 09-16-2009, 12:52 PM   #15
HighLonesome
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Here's how you save MPG, tape a block of wood under your skinny pedal!!
I'll pass.
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