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SayWhat
Dodge Dakota
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2/19/2004
22:54:14
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 Subject: RE: Hypertech power module from Summit?
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William, there's no way in hell your making 375 at the crank and only putting 240 to the ground. Typical HP loss is 25% through the drive train. That would mean you have 320hp at the crank. The R/T is 78% efficient or looses 23%. The transmission on the 4.7L is supposed to be more efficient than the 5.9's transmission. That would put you at almost 80% efficient. That would put you at 300hp at the crank.
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wubs
Dodge Dakota
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2/19/2004
23:11:52
| RE: Hypertech power module from Summit?
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I hope he wanted to say 275. If not what kinda trans do you have so I'll know to stay away from it.
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SayWhat
Dodge Dakota
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2/19/2004
23:43:57
| RE: Hypertech power module from Summit?
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Well, for whatever reason the 5spds seem to be more efficient. I've never understood it. The planetary helical gears that are used in the auto are very eficient. Then you have the lighter fluid in the auto that means less energy is consumed in sqeezing the oil between the teeth. Also, the planetary set surrounds the gear to distribute the load on the teeth evenly all the way around which eliminates side loading/thrust. All of these benefits of the auto is absent in the manual transimision. The only thing the manual has going for it is less reciprocating weight. With todays lighter auto internals, it would be debateable even in the reciprocating weight. But, time after time, test show that a manual trans will put more HP to the ground. Go figure. I'm skeptical of these figures.
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Bill E.
Dodge Dakota
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2/20/2004
02:15:46
| RE: Hypertech power module from Summit?
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got a '03 4.7 quad...love it. Does anybody put out a 'plug 'n play' chip for the little (but HEAVY) bad boy? currently running 3" Catback with a TrueFlow intake system on it. Want more ponies, especially after 2nd gear (I've got the 5 spd. auto. w/ LSD)
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Tnjones
Dodge Dakota
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2/20/2004
11:13:04
| RE: Hypertech power module from Summit?
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Hey SayWhat, it's not so much that a standard is more efficient than an Auto as it is a clutch is more efficient than a tork converter. Although, as you say, the tranny is lighter (both overall and moving components) which gives even further advantage.
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Tnjones
Dodge Dakota
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2/20/2004
12:37:23
| RE: Hypertech power module from Summit?
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Well, I just got off the phone with Hypertech (Local for me). They will not be releasing ANYTHING for the 4.7 EVER (except maybe a programmer for wheel size, rpm limit and other non-performance type changes). They spent a lot of time and money researching and found they could not get any significant improvement over the stock computer! I also asked about custom flashes to match my cams. Nope, they quit doing that too. Said most customers were not happy with the change so they just quit doing it. Sorry guys, or actually I guess there's nothing to be sorry about. We've already got the best electronics behind our motor that can be made! Hurray Dodge and thanks for doing it right!
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GraphiteDak
GenIII
2/20/2004
21:16:55
| RE: Hypertech power module from Summit?
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No sh*t.
We got a little 287 cu in V8 that accelerates and tows like bigger V8's. They must be squeezing out most of what is there.
In the old days, the engineers left a LOT behind to be tweeked (improved) for more power.
Don't forget, no matter what, there is always BOOST as an option!
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Kowalski
Dodge Dakota
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2/21/2004
07:57:29
|  RE: Hypertech power module from Summit?
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Wow, a lot of misinformation here guys ! The four and five speed 45 RFE transmissions are more efficient than the other autos; as Tnjones points out, the manulal tranny is more efficient still because of power loss through the torque converter. Typical loss for most autos is around 25 %, about 20 % for the 45 RFE behind the 4.7 & 5.7, and 15 % for a manual. If hypertech claims they can't get more power out of our PCMs it's not because there isn't more power to be had. I saw significant gain from the extra timing advance the Leach flash gave me, brought it up to 29 degrees. Doesn't Kenne Bell have a flash and ASE have a chip for the other year 4.7s ? (Leach flash is for 2000 only). Ask how much they advance the timing, I've only seen numbers for the Leach flash. If hypertech's given up, look elsewhere.
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Peedee
Dodge Dakota
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2/22/2004
07:41:22
| RE: Hypertech power module from Summit?
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The reason for the difference is called slip. Electric motors have it to factor and hydraulic motors ( torque converters ) have it too. In an electric motor it is the magnetic field slip and in hydraulic motors it is fluid, but they are the same thing as far as physics are concerned.
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