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J.T.
Dodge Dakota
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10/01/2006
00:27:07
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 Subject: Percentage loss of power?
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I got a 98 dak v8 5spd 3.92 posi 4x4 sport
i put an aftermarket throttle body (FORGET SIZE (OVERKILL))
tbs spacer, k&N cold air intake, gibson split rear exhaust (custom), I put the jet chip in there and hooked up a omni magnum ignition and on the dyno it ran 203.8 hp and 278.9 ft pounds at the rear and it ran the same w/o the chip and igintion (I dont think it had enough time to learn the chip when it was on the dyno) i saw on the web a stock 5.2 dak did 173. hp at the rear. TO GET TO MY QUESTION HOW MUCH LOSS IS THERE THROUGH MY TRANSFER CASE SO I KNOW WHAT TO COMPARE TO ????
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Kowalski
GenIII
10/01/2006
08:31:18
|  RE: Percentage loss of power?
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Probably not much loss through a transfer case in 2WD.
Are you comparing with the same tranny ? More loss through an auto than manual.
Lead, follow, or get out of the way
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N56629
Dodge Dakota
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10/01/2006
09:53:02
| RE: Percentage loss of power?
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Any time you think that you are going to want to measure gains you should start at the dyno first and not after you do your mods. Before the first dyno run make sure you have a fresh tune-up to include at least cap, rotor, plugs and wires.
People always seem to think the computer has to "learn" something. I've never seen people come back and say that everything is better now that the computer has reprogrammed itself and is now taking advantage of their mods. If anything, some mods like the tps, the computer does "learn" the setting and everything returns to normal or no gain at all. If your "chip" changed timing then it takes effect immediately and there is nothing for the computer to "learn."
Different drive trains have different losses as Kowalski mentioned. It's difficult or impossible to accurately measure small gains in hp based on any formula since those losses are relatively huge compared to any gains you may have made with your mods. The throttle body spacer gave you a net gain of zero. The Jacobs ignition may have helped the most but then you have nothing to compare it to. You didn't say what you had for an after market throttle body.
This is a rough estimate and there are many different opinions but a manual transmission loses around 15%-17% of engine horsepower and an automatic transmission loses between 20%-25%.
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j.t.
Dodge Dakota
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10/01/2006
18:23:37
| RE: Percentage loss of power?
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its a flometerics throttle body and its a 2x52mm
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TexasTodd
Dodge Dakota
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10/01/2006
20:18:01
|  RE: Percentage loss of power?
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You just proved ONCE AGAIN, that the JC does NOTHING!!
time to learn the chip?--ROTFLMAO
I've got things I'll sell you for half as much, that will give you just as much HP and Tq.
By the way, is that supposed to be a good dyno?
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J.T.
Dodge Dakota
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10/01/2006
23:06:05
| RE: Percentage loss of power?
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well texas todd than what are you doing to get more horsepower? look im not goning to do any internal mods but im gonna put gibson headers, probally a 2.5 inch y-pipe and high flow cat
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Kowalski
GenIII
10/02/2006
09:13:27
| RE: Percentage loss of power?
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Those sound like good mods for your 5.2.
N56629 makes some good points here, nothing is beeter to compare to than your own baseline - a dyno of your own truck before mods. You'll be able to see what these mods do for your motor now. Comparing to others is not accurate - all dynos will read a bit differently; changes in temperature and elevation also affect results.
Lead, follow, or get out of the way
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TexasTodd
Dodge Dakota
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10/02/2006
16:30:04
|  RE: Percentage loss of power?
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I agree with Kowalski, et. al.,
I have the 4.7, entirely different animal regarding some of the mods, etc.
For my engine, headers alone don't do much, for yours, it probably will.
Changing the Y and usually does for both engines.
The 4.7 is coil over plug, so ignitions are not applicable. I actually thought the JC did show gains on the 5.2, in your case I guess not. The dynos of 4.7's I've seen don't do anything.
Sorry to be so brash, I thought you had a 4.7, sorry for the bad ettiquette.
I'm like you, nothing internal, in fact, I've spent very little on my mods.
01 4.7, manual tranny, posi
HO cams- $52 each (there are 2), install myself $0.
HO intake- $140, install $0
Removed clutch fan and fan, $0
Removed third cat (muff shop) $30
Latest plugs are bosch platinum, (runs same as autolites 3923, or the stock champions, ~ $2 a plug- no HP/Tq gain here though- not really a mod.
Home brew 'true' CAI, w/ K&N, about ~$45 for all.- again, not really a mod for the 4.7.
Sup0er chips tuner (the only one that dynoed any gains for thye 4.7, and you could adjust it also.- ~$200, first group buy.
dynoed, with everything above and 3.92 gears, in 4th gear- 229RWHP, 300 RW ft/lbs.
nonSC: 218 and 292
Keep up the good work, and I apologize for the rather poor etiquette, we are both DAK owners!
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J.T.
Dodge Dakota
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10/02/2006
23:51:28
| RE: Percentage loss of power?
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its all rite we all make mistakes but the year should have gave the engine size away. well what about the ho cams? maybe im missing out on something here? Dont laugh but i saw a add for turbonator on the web isnt that just a tornado and does that thing even work (sounds like a scam)
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Kowalski
GenIII
10/03/2006
15:56:43
| RE: Percentage loss of power?
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Well, HO cams are another thing that gives the engine size away - they are 4.7 parts.
Not to say you can't go to a hotter cam by any means; but you only have one cam, and HO is 4.7 specific.
Lead, follow, or get out of the way
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J.T.
Dodge Dakota
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10/03/2006
16:13:53
| RE: Percentage loss of power?
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well bascically all i know is that its a aluminum motor where as mine is cast iron.
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Kowalski
GenIII
10/03/2006
16:45:12
|  RE: Percentage loss of power?
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Well, if you've paid attention to this thread, you now also know that one has 2 cams and the other has 1. By the way, you might not know what you think you know - the 4.7 is a cast iron motor too - but with aluminum heads.
Lead, follow, or get out of the way
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J.T.
Dodge Dakota
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10/03/2006
18:34:56
| RE: Percentage loss of power?
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whatever
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