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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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  #11  
Old 07-27-2012, 03:08 PM
02 Ram 02 Ram is offline
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nah, even 400 is fine for me. they have a lot of good stuff on their site. supercharger stuff too but id rather go turbo. my total was around 2500 for that stuff, not including the ARP's. im thinkin for 5 grand i could have a built 4.7 and the turbo. use turbo Dodge guys know how to get it done cheap and reliable LOL. for power, ill just build my RT up. theres a guy whos pushing 600 on his. the other guy beat a viper with his holset powered RT. its on youtube for anyone thinking a 4 banger cant beat a viper


new total is 3715.39 without the tubo stuff or motor and machining. to me, not bad at all. gonna be less than my RT build, but then again its not including all the valve train, porting and whatever else im not thinking of. still not bad to me
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  #12  
Old 07-28-2012, 04:15 PM
02 Ram 02 Ram is offline
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well, i got an email from them. forged crank is no longer available
total now is $3,415.35 and thats adding a few extra's
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Last edited by 02 Ram; 07-28-2012 at 04:25 PM.
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  #13  
Old 09-15-2012, 10:11 PM
CTFolmar CTFolmar is offline
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I have an 01 Durango with a 4.7l and 200000 miles and its getting tired. I'd like to swap in the 300 hp version. How much headache am I asking for? I plan to use a low mileage unit from a wrecking yard, what do I need to get with the engine. Can someone please give a summary of what I need to know to make the swap? Thanks in advance.
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  #14  
Old 09-15-2012, 10:22 PM
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CTFolmar, I haven't done the swap so am not 100% sure but just know that there may be more involved than you are thinking. The newer 2008+ 4.7L has two spark plugs per cylinder, electronic throttle body, and other differences(heads, manifolds, cams, etc) as compared to the 2007 and older 4.7L. It will bolt right in to to the frame/transmission, but your biggest obstacle will likely be the pcm, wiring harness(s), and sensors.
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  #15  
Old 09-17-2012, 04:43 AM
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Quote:
Originally Posted by snrusnak View Post
Yeah to get any real hp out of the older 4.7 you have to do a lot of work(heads,cams, etc) just to get 350-400hp. With turbo 400+ should be fairly easy.

The new 4.7 has a lot more hp stock, so it's easier to get to 450/500hp. Turbo'd it should hit 450 hp pretty easy (6-8psi). Still though I haven't seen any turbo 4.7. The bad thing about the new 4.7 is there's basically no aftermarket support.

Keep in mind all these engine's were designed to be truck engines. The older 4.7 may only have 235hp and isn't real fast but it has nearly 300lb ft of torque which is more than adequate for a light duty truck. And the newer 4.7 at 310hp/330lb ft is pretty impressive for a small v8.
Are you thinking 450+ at the crank or at the wheels? My 5.7 put 488 at 9psi to the wheels. My 6.1 will most likely be around 600 at 13 psi
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  #16  
Old 09-17-2012, 08:38 AM
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Quote:
Are you thinking 450+ at the crank or at the wheels? My 5.7 put 488 at 9psi to the wheels. My 6.1 will most likely be around 600 at 13 psi
Hey karateman, yes I was talking about at the engine. Surely it's possible at the wheels but would probably require a lot more work and money.

So if you're at 488rwhp that's probably about 550+hp at the engine, right?
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  #17  
Old 09-18-2012, 01:28 AM
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Quote:
Originally Posted by snrusnak View Post
Hey karateman, yes I was talking about at the engine. Surely it's possible at the wheels but would probably require a lot more work and money.

So if you're at 488rwhp that's probably about 550+hp at the engine, right?
Yeah it depends on the drivetrain loss... I've read any where from 21%-29%.

Heck if it is 29% I'm at 630+ at the crank.

At 21% I'm at 590 at the crank.
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  #18  
Old 09-18-2012, 01:30 AM
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Most new hemi trucks Dyno at around 300-310rwhp. So that would be around the 29% dt loss.
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  #19  
Old 09-18-2012, 08:08 AM
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Yeah well 300hp/390hp would be a ~23% loss. But keep in mind it's not really a percentage loss, you don't lose more power just because you make more power.

That example above with the hemi is a 90hp loss. It's probably the same in your truck(depending on what you've changed in your drivetrain such as transmission modifications and TC). Just assuming it's still 90hp loss, the percent changes.

Say my 4.7L makes 350hp as is. Stock was 310hp. Say I didn't change my TC and the drivetrain is 100% stock. I don't lose more power to the wheels just because I make more power. So if a stock 4.7L dynos 220rwhp and mine makes 260rwhp, both only lose 90hp to the wheels. That's ~29% for the stock 4.7L and ~26% for mine.

Just wanted to clarify that going by a set percentage for drivetrain loss isn't really accurate. Basically any 4.7L or hemi with similar drivetrain loses ~100hp, unless maybe you start getting into really high hp numbers with FI and aftermarket transmissions....I'm not sure if it'd be more or less then. I'd think a better transmission would mean less loss.
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  #20  
Old 09-20-2012, 02:29 AM
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cool. good to know
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