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steve o
Dodge Dakota
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1/21/2008
14:03:27
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 Subject: hp
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eh I'm ok off the line but I'm looking to increase my hp, not sure how to do it. any help would be good, or even if someone can point me to a page or a post, that would be cool>
Ive got a 03 cc 4.7 4x4, with superchips, airaid, dynomax fake duals, KRC 206 cams, and a "tb spacer" (it was the first thing I got befor I new they were crap haha)
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Kowalski
GenIII
1/21/2008
17:40:09
| RE: hp
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Getting rid of the stock y-pipe for something less restrictive should help a bit.
What gears are you running ? It won't actually increase hp, but going to lower gears will multiply your torque for better performance. I'm running 4.10; some have gone to 4.56.
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steve o
Dodge Dakota
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1/21/2008
18:30:03
| RE: hp
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I had thought about gears (I'm not really mechanicaly inclined).. will the lower gears help my response at highway speeds?? Ive changed jobs and now do alot of single lane highway driving so I'm looking for alitle extra passing power?? if so (roughly) what would it cost to install 4.10'S in a 4x4?? right now ive got the 3.55's. I can probably afford it but is it worth it? tx Kowalski
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Kowalski
GenIII
1/21/2008
18:51:13
| RE: hp
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Expensive, but it was worth it to me. I had 3.55 as well. Big performance increase, quick passing. For acurate pricing, find out who is good at it near you, and ask for an estimate.
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steve o
Dodge Dakota
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1/21/2008
19:18:04
| RE: hp
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thx Kowalski that's the answer I was looking for.
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Kowalski
GenIII
1/22/2008
15:30:09
| RE: hp
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Your welcome. Doesn't seem to be a milage penalty with this combo either, at least not with my driving style (fast but fairly fluent). Got 15 before the swap; actually went up to almost 16 after. Others have seen similar results, wouldn't have believed it until I saw it myself. Probably has something to do with the 4.7 being a happy revving engine, puttting it into the "sweet spot".
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Tnjones
Dodge Dakota
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1/25/2008
21:07:25
| RE: hp
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Amen Kowalski. Be careful with TOO much gear Steve. When highway driving you can kill your gas milage. I've got factory 3.92 and am happy. A 4.10 prolly still isn't too bad, but that's the point where milage starts to drop off fast. Big gears for acceleration, small for milage. Only you can decide where on that trade-off band you want to be.
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Kowalski
GenIII
1/28/2008
17:53:42
| RE: hp
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Well, the milage thing will vary for different engines. While what you say may is probably true for the average engine, a number of us have found that isn't true for the 4.7. Milage not only did not drop off with 4.10 gears, it actually improved for myself and several other posters here. I didn't lose any highway milage with this swap. Different engines operate more efficiently at different rpms.
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Tnjones
Dodge Dakota
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1/29/2008
02:01:21
| RE: hp
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Maybe you didn't read my post, I said "A 4.10 prolly still isn't too bad, but that's the point where milage starts to drop off fast." In other words, beyond 4.10 milage drops fast. In fact, your highway milage will drop with any gear beyond the basic 3.55. City milage will prolly improve all the way to a 4.10. It all depends on your personal driving style. Since I drive nearly 80% highway miles... However, if you never spend more than 2 or 3 exits on the highway... Milage isn't engine specific when it comes to gearing. it's mph/rpm specific. You want your engine operating at peak efficiency(RPM) at cruising speed(mph). All 4.7's don't have the same peak efficiency RPM. If you never drive consistantly over 40 mph (like in a large city), you could prolly still get relatively (relative to another ratio)good milage with a 4.51 gear. If you spend most of your time cruising the open highway at 70+ MPH, I would recommend the basic 3.55 for milage. Personally I can nearly idle (about 1000 RPM) at 35 MPH in 5th gear without touching the gas through neighborhoods, with no bucking, even up and down hills. However, on the interstate I'm hittin my power band (about 2500-2800 RPM, with peak hp about 3000-3500 RPM) at interstate speed. Very efficient in town, not so efficient on the highway. I chose my 3.92 as a good balance between milage and acceleration.
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