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General Forums => The Mess Hall => Topic started by: grumpygy on February 19, 2012, 07:07:03 PM
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Just installed mine. It got rid of the Whistle I had from my Cold Air Intake(ok Hot air ). Revs Quicker. Only change I did not like was in 5th I lose power quicker now and have to down shift.
But I can now pass easier by just dropping it down to 4th and off she goes. Also going up thru the gears it really does rev quick.
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I know this is a older post, but I have a question when you bump up to a bigger throttle body did your MPG decrese. Mine has and my thought is maybe I need to go with a bigger gap on my plugs. Currently running accel 42,000 volt coil, accel wires, and NGK plugs gapped at .042. Do you think a bigger gap will help in MPG, since I got a bigger throttle body then before.
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This question is for Mr bounty hunter, I have bump up from a stock 4.0L TB to a bigger bore and I love the response and HP gain. The only thing I noticed is I am getting less MPG. I did not purchase it from you. I do have cold air intake, TBS, accel coil 42,000 volt, accel wires and NGKs gapped at .042. I need your expert opinion, since I went with a bigger bore do you think I need to increase my plug gap to compensate for the increased air intake? Thanks
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You know maybe I am just on the pedal harder because I like the way it feels, just thought about it I have been reving it up pretty high on take off. Maybe I need to change my driving habits. But the question remains should I open my plug gaps wider?
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You'll just have to experiment with plug gap and see what your gains are. You can safely open the gap up if you have a hotter coil.
A larger throttle body will generally improve your MPG if you can keep your foot out of it. Your results are typical as it's tough to drive conservatively with the large increase in power and throttle response.
Did you jump up to a 62mm TB?
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I'm Running the Screaming demon coil so have been running a .060. But do not have enough mile on the throttle body to determine if my milage went down.
But would say I think it may have but that may be my driving style doing it.
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Wow .060. Well maybe I will try to go with a bigger gap. My coil puts out 42,000 volts and I believe screaming demon puts out 45,000 volts. I like my power increase so much that I am willing to take the lost MPG, but only if I have to. But I have noticed I have been reving it up pretty high on take off and just driving faster wherever I go. It feels so good. Maybe its driving habits. I will try regapping with my accel coil and wires and see if it makes any changes. Hope she supports it if not maybe I will get the scremin demon setup. Thanks.
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Yes and no. Its 62mm on top side and tapers down to 60mm just above the throttle plate and on the bottom it measures exactly 57mm. She feels real good on take off and on through high end. I admit I have been driving it real hard, I speed every where I go. My driving habits are the same as with the regular 4.0L TB. Just sucking up more gas because I am going faster. Do I need to drive like la de da da or maybe if I gap bigger I can keep my driving habits, and continue to drive fast and keep my old MPG that would be nice. Well we will see what happens after testing different gaps. Thanks a bunch and we will try to keep you posted. Happy Wheeling.
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Just have to ask what is your MPG.
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Well before with the regular 4.0L TB it was 12 to 13 MPG, which then I could get about 50 miles to 1/4 tank, and now with the bigger TB bored 62 over 57mm I am barely getting 40 miles to 1/4 tank. I know thats not the way to calculate MPG but it is less than before. But like I said before I am driving like a bat out of H---. I am a daily driver and right now I think I am on the auto bahn. WOOOOOOO ! I do have a stock 4.0L TB back on the self so worst case I have the option of going back to the previous setup. But darn she feels so quick right now. Power to spare. Makes we want to get a giant sticker that say 2.5L FAST
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Doesn't the stock 4.0l tb taper down to 57mm?
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No, it tapers down to 55mm. But I tell you what every bit makes a difference. In my case it was hard to believe what I felt with only 2mm bigger on bottom side. Remember you should bore intake manifold to macth.
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Well just regapped my NGKs from .042 to .045. First impression crawling real smooth also right now that little bucking I had is gone. When I slightly step on the pedal it dosnt jerk, its real smooth and more controled. At first it seams like I lost torque, but when I step further on pedal its still there just smoother. Instant take off still good and responsive, seems to shift easier to. While intering freeway no problem hits 70MPH easy. I did notice I lost just a little punch when cruising at 60 trying to get back up to 70 mph. Still climbs to 70 but its more of a gradual pickup, steady and smooth. You just dont feel the punch. But it holds on headwind going uphill maybe reduced to 65mph then up again. As far as mileage to early to tell. But like I said the most noticible was no bucking while crawling and super smooth and responsive. We will see what happens with the MPG. I depends, just might have to drop the gap down to .044. Time will tell. All mods must run in sync to the perfect macth. Will keep you posted.
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try 0.0435 and see if it's better (1/2 way between the 2) :wall:
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Yep your probably right, I am gonna take it for a few more runs see how she does and how I feel about it. right now I kinda miss that punch/torque. But I agree and predict I will end up with something in the middle as far as the plug gaps go. Its amazing how just a hair adjustment on gapping plugs makes a difference you can feel. Then again with my 4 banger its always been so sensitive to small changes. Yep the quest for more power and decent MPG. I guess thats a hard balance to find. Thats like for example my cold air intake. Its homebrewed box with k&N yet it yeilds better results compared to a AEM setup. I make one adjustment on that and it changes charateristics. My air intake box has a adjustable slide to fine tune its cold air intake coming in from the removed headlight bezels. Its air is ramed in there of course depending how fast I am going. Yes I now only a certain amount of air can go past the filter but its readitly available, and under presure ready to be used as its crammed in there. Maybe It dont make any sense, but it works great. Well dont mean to get off subject I talking to much. Will let you know what happens with my plug/ gapping/MPG.
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Well checking in with update. Like I was saying before power is great but mileage has been suffering really bad. So after doing a bit of driving, I have been making a few small changes to regain MPG and still keep most of HP gains. OK lost a lltte response when I swapped back to the stock 4.0L but nothing to complain about at all. Still no increase in mileage. Then I closed up my adjustedble air intake box a bit and still no increase in MPG. Squeezing out 40 miles from about 1/4 tank and thats filled to the rim. Still power is good, actually increase in torque and still can hit 70 MPH just not as soon. O yeah that includes droping the plug gap to what it was before.042. Trying to retrace and back track where my settings were before. Power was good and I was getting 200 miles out of a tank full. I cant get it back. Do I need to reset and disconnect my battery maybe? Man It was good where I had it before. Gotta find that sweet spot again. No way am I saying a bigger bore TB isnt good for HP, it sure is. But right now I am a daily driver. Will continue with small changes in search for that balance of power and MPG I had before.
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I don't think a smaller/bigger gap would make a difference. These engines are big and inefficient.
I think the following will help more: more pressure in your tires, get smaller and more narrow tires, loose your excessive weight, put on the hard top and close the windows, shut off the airco, drive at constant pace,....
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When ever you switch the throttle body or sensors, I was told to reset the computer. The comptuer learns the norms of all the sensors and sets fixed values around what it learns (min, max, avg). Resetting the computer lets it readjust to the new running enviornment. It can account for the change on it's own, but I think it typically is like 100 run cycles - resetting speeds it up.
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Well silly me, that was somthing I did not do is reset via battery. I usaully do it each time with a upgrade. Just not use to doing it on downsizing TB. Thanks well do it today.
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you're going the wrong way about it
it helps if you actually calculate the mpg and not estimate it ("about" 200 miles on a "tank" can be anywhere from 16 to 10 mpg).
since you didn't change anything major you magic airbox and the .002 difference in plug gap won't account for any mpg increase or decrease, the only way to do it properly is to average over 3 or 4 fill-ups, add the quantity up and use the odometer reading to get the exact mpg, your variation is more likely to have been different due to your estimations rather than changes in the way your Jeep runs. It also matters a lot where you drive it, you should take the same route if you want to compare exactly the mpg and also you should drive exactly the same (shift at the same rpm, drive at the same max or min speed for the same amount of time) and travel the exact same distance.
oh, and another thing, the first time you reset the computer until if finishes the learning cycle (about 10 days to 2 weeks for the average daily driver) it will be worse on mpg and not better, it gets better the more data is collected.
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Yes Sir thanks for that info. O yea when I had the bigger TB I was taking the same route but I was driving like real hard, stomped on it on every take off and would cruise just as fast as I can go. It felt so good as far as power I could not drive normal, by choice. I was racing wherever I went. That would make a difference am sure. I am still tossing maybe going back to bigger bore and just changing driving habits, hard to do when it feels so good. Thanks again.
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I switched to 91 octane and set my computer with my HyperTech programmer a few months back. I can't switch it back because of my right foot either. :trollface:
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Woooooo Haaaaaaaaa ! That sounds like fun, except for suckin up gas yes/no ?
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It doesn't really suck up more other than when my foot sticks the pedal.
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What mods are you currently running and do you know what your MPG is?
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Well, I average about 13-14 mpg in mixed city/highway to work. 15 mpg on long road trips. Its a 4.0L with Manual 5 speed on 35"for mud terrains geared to 4.88 (-12% to stock). AEM intake, Banks Monster Exhaust, and the HyperTech programmer.
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Sounds nice, stop! you making me jealous LOL. Sounds like you got a nice rig. Yep one of these days I am gonna grow mine up. Get a real lift and at least some 33s with a gear change. Hey let me ask you If money was not a issue and if you had a choice to either get a 08 JK 4 door or continue building your rig with no limit which would you choose. You can only choose one, which would it be?
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I really like mine. I'd like to finish it before starting over. The 4 doors seem nice, but I really like the 2 door wranglers. The stretched TJ or LJs would be nice, but when I see the 4 doors I just see a Chrokee - sorry if that comes of snobbish. It's great daily driver and fun offroad. Now, that blue concept Mighty FC concept would be awesome 4 doors. :smile:
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Not snobbish at all, NP. Yeah I could see that about a JK. I think it would make for a good expedition rig. But I also just love my TJ. O yea that mighty FC is on my wish list. I hope they do go into production, whats the latest news about that.
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Heres one version
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Not sure. I haven't read much up on it. The J12 looked neat too.
(http://o.aolcdn.com/dims-global/dims3/GLOB/resize/620x430/quality/85/http://www.blogcdn.com/www.autoblog.com/media/2012/03/00-jeep-j12-concept.jpg)
BTW, when I said the great daily driver and fun... - I meant my TJ was.
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Heres one version
That's awesome - now it's just missing the back bed. hahahaha
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Thats right the TJ, me to, its my favorite. O yeah that truck is cool to. Hey are we getting of topic of TB. No we are not. What size TB you guys running stock or bigger?
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62mm straight through. Along with a smooth 62mm spacer and bored manifold. Using one of Sharp's Adj. FPR and Ford injectors. Coupled with the 5.38 gears it moves the 36" TSL's around just fine.
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Man Mr Bounty Hunter 36 in tires, could you not find anything smaller. O yeah are those gears on dana 35 and dana 30? You sound like you all serious or like your into jeeps or something. I know you do, just kidding.