Spokes Posted March 26, 2009 Share Posted March 26, 2009 any cheap tricks to get a little more power out of a stock 4.0? ive got an intake and the exhaust is on the way soon. i was just wondering? thanks! Link to comment Share on other sites More sharing options...
SkipshotMJ Posted March 26, 2009 Share Posted March 26, 2009 if you had an airbox you could've drilled a couple 4 in. holes below the air filter. It gives you a little bit more power and it sounds kinda cool haha. buuuut, you're gonna go through a bunh of air filters taht way. Link to comment Share on other sites More sharing options...
Spokes Posted March 26, 2009 Author Share Posted March 26, 2009 if you had an airbox you could've drilled a couple 4 in. holes below the air filter. It gives you a little bit more power and it sounds kinda cool haha. buuuut, you're gonna go through a bunh of air filters taht way. haha yeah thats not an option lol Link to comment Share on other sites More sharing options...
Pete M Posted March 26, 2009 Share Posted March 26, 2009 Which trans do you have? Stock gearing in your axles? What size tire are you running? Link to comment Share on other sites More sharing options...
Spokes Posted March 26, 2009 Author Share Posted March 26, 2009 everything stock. and tires are 31x10.5 Link to comment Share on other sites More sharing options...
Geonovast Posted March 26, 2009 Share Posted March 26, 2009 everything stock. and tires are 31x10.5 Which transmission though? 5 speeds and automatics came with different axle gearing. If you're running 31s on 3.07s, you're definitly going to want to regear. Take a look through this thread viewtopic.php?f=2&t=15641 Link to comment Share on other sites More sharing options...
Pete M Posted March 26, 2009 Share Posted March 26, 2009 Yup, the tires are the problem and regearing is the solution. :thumbsup: Do it right, and it'll put a smile on your face every time you punch the gas. :D Link to comment Share on other sites More sharing options...
wolfpackjeeper Posted March 26, 2009 Share Posted March 26, 2009 No real ways to add cheap power to the 4.0. All the "cold Air" intakes and throttle body spacers are gimmicks. To add power you either need to upgrade intake and exhaust THEN add a cam as well. Or build a stroker, add forced induction, or add nitrous. There is no replacement for displacement. Link to comment Share on other sites More sharing options...
Pete M Posted March 26, 2009 Share Posted March 26, 2009 There is no replacement for displacement. Gearing comes close. :D Link to comment Share on other sites More sharing options...
TNT Posted March 26, 2009 Share Posted March 26, 2009 There is no replacement for displacement. Gearing comes close. :D Not if the 4.7 has the same gear... :brows: For 31" tire 4.10 would be my gear choice no matter what trans it has. Link to comment Share on other sites More sharing options...
Pete M Posted March 26, 2009 Share Posted March 26, 2009 I watched an stock iron duke 4 banger in a CJ smoke 36" tires on pavement. I must say I was impressed with what 5.86 gears could do. :D Link to comment Share on other sites More sharing options...
jtdesigns Posted March 26, 2009 Share Posted March 26, 2009 Does anyone know the gear ratios of the BA-10 vrs the AX-15? Link to comment Share on other sites More sharing options...
Pete M Posted March 26, 2009 Share Posted March 26, 2009 Not offhand, but I think they were pretty similar to each other. Link to comment Share on other sites More sharing options...
Pete M Posted March 26, 2009 Share Posted March 26, 2009 Found them on Novak's site Gear ratios for the AX15 are: 3.83, 2.33, 1.44, 1.00, 0.79 Gear ratios for the BA10/5 are: 3.39, 2.33, 1.44, 1.00, 0.79 Link to comment Share on other sites More sharing options...
jesawyers Posted March 26, 2009 Share Posted March 26, 2009 No real ways to add cheap power to the 4.0. All the "cold Air" intakes and throttle body spacers are gimmicks. To add power you either need to upgrade intake and exhaust THEN add a cam as well. Or build a stroker, add forced induction, or add nitrous. I was wondering what you guys thought of this... http://www.turbomirage.com/water-alcoho ... -list.html John Link to comment Share on other sites More sharing options...
jtdesigns Posted March 26, 2009 Share Posted March 26, 2009 No real ways to add cheap power to the 4.0. All the "cold Air" intakes and throttle body spacers are gimmicks. To add power you either need to upgrade intake and exhaust THEN add a cam as well. Or build a stroker, add forced induction, or add nitrous. I was wondering what you guys thought of this... http://www.turbomirage.com/water-alcoho ... -list.html John Thats really only for turbo intercoolers.. Link to comment Share on other sites More sharing options...
jtdesigns Posted March 26, 2009 Share Posted March 26, 2009 Found them on Novak's site Gear ratios for the AX15 are: 3.83, 2.33, 1.44, 1.00, 0.79 Gear ratios for the BA10/5 are: 3.39, 2.33, 1.44, 1.00, 0.79 So ax-15 has a granny gear huh... lol Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 26, 2009 Share Posted March 26, 2009 For 31" tire 4.10 would be my gear choice no matter what trans it has. :agree: . Matching the correct gears w. your tires gives the best bang for the buck performance gains. And 31" tires w. 4.10 gears are a nearly perfect marriage. Here's how it worked out w. the AW4. 27" tires w. 3.55 gears = 1855 RPM @ 60 MPH & 2474 RPM @ 80 MPH 31" tires w. 4.10 gears = 1879 RPM @ 60 MPH & 2505 RPM @ 80 MPH It moves the power band up about 12%-15% across the board which translates to more grunt off the line, better climbing on long grades, and in my case, a slight improvement in gas mileage. Link to comment Share on other sites More sharing options...
wolfpackjeeper Posted March 26, 2009 Share Posted March 26, 2009 I have a hard time answering "gearing" when the question is "how do I make more power". Gearing is a great way to make the jeep itself quicker with the power it already makes. However it does so at the expense of top end torque and horsepower, limiting total speed. So if someone asks how to make the jeep faster or what is the best bang for the buck to make it quicker, yes. But I would not answer this for a question about what power mods to look into. Don't get me wrong, I think gearing is a great way to make a track car cut a wicked 60' or 1/8th, and it will make a lifted jeep with bigger tires feel quick again. For me it is just a semantic or philosophical difference of opinion. Power is made from the engine. That being said, I want a turboed 4cyl with 4.10 gears pushing lowpro's on my street MJ. Link to comment Share on other sites More sharing options...
Spokes Posted March 26, 2009 Author Share Posted March 26, 2009 its an auto tranns.... so with 4.10 gears ill get a lot more "get up and go"? lol Link to comment Share on other sites More sharing options...
Giffer Posted March 26, 2009 Share Posted March 26, 2009 yeah 4.10's will really increase your get up and go. and with the 4.0, its a great stock motor, but to add power to it will cost you way more then what its worth. the easiest way to put some power to the wheels of a jeep is SB power. i really hate the term " no replacement for displacement" cause it is so not true. them little japanesse and european motors blow away or motors hands down. like a 2.5 toyota motor over there puts out 320 HP at the crank where are stock 350's- 5.7 puts out under 300 to the crank. plus the balnacing of them motors is incredable. there deisels red line at what are gas engines redline at. just my 2 cents :hijack: Link to comment Share on other sites More sharing options...
Spokes Posted March 26, 2009 Author Share Posted March 26, 2009 I'm not swapping the motor... gears are do-able tho. Link to comment Share on other sites More sharing options...
wolfpackjeeper Posted March 26, 2009 Share Posted March 26, 2009 yeah 4.10's will really increase your get up and go. and with the 4.0, its a great stock motor, but to add power to it will cost you way more then what its worth. the easiest way to put some power to the wheels of a jeep is SB power. i really hate the term " no replacement for displacement" cause it is so not true. them little japanesse and european motors blow away or motors hands down. like a 2.5 toyota motor over there puts out 320 HP at the crank where are stock 350's- 5.7 puts out under 300 to the crank. plus the balnacing of them motors is incredable. there deisels red line at what are gas engines redline at. just my 2 cents :hijack: what toyota 2.5 gives you 320Hp? Is it turboed or supercharged. At the crank or at the wheels. My Ls1 put down 343HP at the wheels with a tune and tubes... aint nothing but a tree fitty, or 346, whatever The there is no displacement for displacement is true. And will remain so for quite some time. The only thing that seemingly breaks it is nitrous. And there is some different chemistry there making that one work. Some argue the forced induction proves it wrong, but at its roots forced induction is increasing the density of air in the cylinder, which at normal pressure would equal a larger displacement. If you take that 2.5L and bore or stroke it it will increase the displacement and increase its capacity for making HP. Comparing a new motor to a 1950's design does not disprove the adage. The old apples and oranges idea. Link to comment Share on other sites More sharing options...
summerinmaine Posted March 26, 2009 Share Posted March 26, 2009 Yup, the tires are the problem and regearing is the solution. :thumbsup: Do it right, and it'll put a smile on your face every time you punch the gas. :D I've heard that regearing give the most "bang for the buck" and I don't dispute that, necessarily. The question is "how much bang and how many bux" are we talking about? I've been thinking of regearing to 4.10s since I put on the 31s, and holding off on the stroker, but I'm getting quotes of $1-1.3K to regear (since, out here, a used D30 with a 4.10 goes for $5-600), and a stroker might not cost more than $1.8K, since I can do a fair amount of the work myself. I get the impression that many of you are thinking $5-600 for a total regear, and if so, I want some of what you're smoking! :thumbsup: Link to comment Share on other sites More sharing options...
wolfpackjeeper Posted March 27, 2009 Share Posted March 27, 2009 If you can do all the work yourself a total regear may not cost that much, assuming that you use cheap genuwhine gears and cheap bearings. And that you do not have to replace a carrier, which you probably will. I have 33's on my cherokee, before the stroker I was saving for a gear swap. Then I popped the motor. SO I took the money and built a stroker. I am actually pretty happy with 3.55's and the torque band of the motor. Granted I will be switching to 4.10's, but I have decided against the 4.56's I was considering before the motor swap. You can build a stroker for $1.8k easily. I did. If you are doing all the assembly it comes out fine. The only thing I reused was my stock cam. Even had a 3angle done on the head and added a 00+ manifold. Link to comment Share on other sites More sharing options...
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