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Clevite 77
Dodge Dakota
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7/11/2002
08:34:38
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 Subject: Turbo question for dunner
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Hey Dunner
I did a search on your name, I was looking for some more info on your truck. I came across a post that said don't quote me on this, I hope I remember correctly, with your mods you said you get 400 hp and 500 ft torque with only 5 or 7 psi, then I also read that 14 psi will double the stock power (roughly). My question is how do you get that kind of power with only 5 or 7 psi? I was also curious how much power you make at 14psi?
I have a 2002 4x4 CC with 3.92's automatic, do you think I can make this kind of power? I know there's no way I can ever go as fast, due to the auto, and the 4x4 but I would still like to have the power. Do you think the T-case will hold up?
Sorry for all the questions, since I decided to keep my 4.7L I wanna go ahead and build er up now.
Thanks, I appreciate the help,
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Duner
Dodge Dakota
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7/11/2002
10:34:53
| Rule of thumb for boosted numbers
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The generally accepted rule of thumb is that you
double your hp at 14lbs of boost if you are
somewhat close on your state of tune. 7lbs of
boost should produce 50% more hp. According to my
previous dyno pulls - I was making about 285-290
hp and 380-385 tq before adding the turbo (242rwhp
and 322rwtq). 7lbs of boost should be making 420
hp or so and 14 lbs should be 550! Both of those
numbers are with ideal A/F ratios and no timing
removed... so it's probably safe to assume that
I'm making slightly less than that. Here's an
online calculator that does the math for you:
http://www.stangnet.com/calcs/boostcalc.htm
The numbers from a bone-stock 4.7 (235 hp) should
be: 350 hp from 7 lbs of boost and 450 from 14
lbs. Although I must tell you that the 14 lbs
number is totally unreachable unless you are
running straight high-octane race gas. I believe
that 7 lbs of boost is as high as I would go with
normal premium unleaded.
I have no clue whether the T-case could take that
kind of power. The NV3500 isn't rated for that
kind of power either, but so far mine is holding
up just fine (knock on wood). I think that having
an automatic would improve the chances of the
T-case living a long life - especially if you kept
it in the 7 lbs boost range.
Dun
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Clevite 77
Dodge Dakota
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7/11/2002
10:44:51
| RE: Turbo question for dunner
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how did you get to this point?
"I was making about 285-290
hp and 380-385 tq before adding the turbo"
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Duner
Dodge Dakota
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7/11/2002
10:58:08
| NA Mods...
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I got to that point by making a few mods that
worked well together.
Custom PCM
Ported 68mm TB
Minor intake manifold mod
HomeBrew intake (K&N cone on stock airhat)
IAT adjustor
Fuel rail cooling system
Full 3" exhaust from Y-pipe back
3" MorFlow cat
Mopar 3" cat-back
Flowmaster 70 series
Removed clutch fan
Everything except for the PCM could be matched
part for part by anyone. The closest PCM program
to this one would be the Leach program.
Dune
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Clevite 77
Dodge Dakota
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7/11/2002
11:15:14
| RE: Turbo question for dunner
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wow that doesn't sound all that complicated, do you have a more detailed version of your list, like what exactly you did to the intake, the type of fuel system cooler? Where I live I don't have emission testing, so I took off the third cat entirely, with a flomaster I ran it out into duals, so I have a much more free flowing than you do, wouldn't this be a better setup for a turbo?
I do have a generic turbo question, a s/c uses a belt drive off the engine thus taking away some power to add power, turbos use the exhaust to spin a turbine which is connected to a impeller that brings in fresh air, My question is....Is there any restriction on the exhaust to spin the turbo?
I really appreciate all your help
I want to add a turbo, so I figured you'd be the guy to ask, thanks again
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Jeffster
Dodge Dakota
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7/11/2002
21:00:53
| RE: Turbo question for dunner
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Unless your running true dual exaust dual's from the muffler you won't make more power or be more "freer flowing" than a straight 3" cat back. The single 3" has from various sources been claimed to be ever so slightly more efficient. (No conflict in the exaust splitting out in to 2
pipes)
I also am running a straight 3" from the Y and it made a nice dif with the stock 3rd cat removed.
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D
Dodge Dakota
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7/11/2002
21:40:24
| RE: Turbo question for dunner
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duner, who did your pcm? what did you do to
your intake manifold...I am putting the HO
manifold on, and if I could modify it in anway
before I install it, that would help enormously.
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Duner
Dodge Dakota
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7/11/2002
22:41:47
| RE: Turbo question for dunner
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The minor intake manifold mod is just the removal
of a small vertical part that hangs down behind
the TB in the path of the incoming air. If you
pull your TB off you'll see what I'm talking
about. I have no idea whether the HO manifolds
have them or not.
The small amount of back-pressure that the turbo
creates is nothing at all in the grand scheme of
things. Theoretically the freer the exhaust is
the better turbos like it.... but I haven't ever
tested it for myself.
My fuel rail cooling system circulated water to
cool the fuel rails.
My PCM was reprogrammed by a company that no
longer handles Mopar products. The next closest
program is the Le
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TorqueMonster
Dodge Dakota
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7/12/2002
02:22:27
| BS
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Hey Dunner your dreaming man. Everybody knows that the wimpy 4.7 motor doesn't come anywhere close to putting out 385 feet of torque. Do you really expect us to believe that your peace of crap makes that much power? Has anybody ever even seen this truck? I'm tired of hearing about how fast it is supposed to be. I doubt it even is real. If it is real you probably have it all gutted and stripped just to make it go fast. I bet you couldn't tow with it if you had to. And if it is real it probably only makes a good top end because without the cubic inches it won't have the torque to take off fast like my truck does. I don't care what kind of crap you try and pull there is no replacement for displacement. TORQUE RULES!
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Hurst Bird
Dodge Dakota
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7/12/2002
07:49:50
|  RE: Turbo question for dunner
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Dammit TorqueMonster, that's the truth!! Sing it out, brother!! There's no way that 4.7 of Duner's can outperform an R/T. And now that it has TWO turbo's, well, forget it. It's over. No way. Never. The 5.9 will always be the king of the asphalt jungle.
Sweeeeeet.
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alex
Dodge Dakota
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7/12/2002
07:50:29
| RE: Turbo question for dunner
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Yeah, it'll be the king until they quit making them. Uh oh.
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Texas Todd
Dodge Dakota
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7/12/2002
09:09:16
|  RE: Turbo question for dunner
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Torque Monster,
Does your truck have any torque? You were up a little late slamming Duner like that.
But really, have you got any torque man?
Don't torque me off!!!!!
I heard the only torque you got was when you were torqueing those spark plugs in!
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mannyzamora
GenII
7/12/2002
11:59:40
| RE: Turbo question for dunner
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Message:
hay dunner does this sound more like this torque guy, na na na na naaaaa. my twuck hass mo powa dan yoss..
manuel i zamora
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Duner
Dodge Dakota
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7/12/2002
15:10:12
| Hahahahaha
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Dear Mr. TorqMonster,
You obviously have some sort of problem with a
smaller engine outrunning your 5.9. Is that a
problem for you? I know I really enjoy racing
against people of your demeanor. Oh, that's
right. I read before that you don't race your
truck. It's a good thing you don't.... you might
get beat! You may choose to disbelieve the
numbers, but I can assure you that the truck is
real. I hope to get some dyno pulls on this thing
fairly soon. Just wait until you see how much
TORQUE this engine is producing! I know you think
that torque rules - but it only rules if you are
man enough to compare it to others. Take your rig
to the track and then come back here and tell us
all about how torque rules. Or are you skeered
that some little rice-burner with no torque
whatsoever will out run you! hahahaha
Mr. HurstBird - I certainly hope to prove you
wrong! I got torque - how about you? he
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