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jasonsdakota
Dodge Dakota
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12/16/2004
23:39:40
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 Subject: to supercharge it?
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well, i'd love to supercharge the dakota, but i don't want to have to upgrade injectors, fuel pump, or anything. i just want to add a paxton unit, or similar, and spend about 2000 or less on parts. guys that spend $4k are getting alot more than the unit and piping right. what if i left it at about 4-5 psi, could i get around spending all that excess money and still gain about 50 hp?
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rtspeeddemon
Dodge Dakota
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12/17/2004
10:43:48
| RE: to supercharge it?
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You cannot add a charger without additional fuel.
Think about it the Charger adds more AIR so you must add more FUEL or things go BOOM!
Do it right or dont do it cause you will be sorry.
If you are looking for a cheap route throw it on the bottle..NOS.
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dude
Dodge Dakota
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12/17/2004
15:49:30
| RE: to supercharge it?
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If everything else is stock then 5psi is the max you would want to go with without upgrading to 24# injectors
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jasonsdakota
Dodge Dakota
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12/18/2004
19:31:12
| RE: to supercharge it?
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at WOT do the injectors turn on at 100% with the stock programming. if so and is currently more than enough fuel, 5 psi should not add so much air that it starts to run lean. so 5 psi is ok? then i would just need compressor, tubing, fabrication to mount, belt to turn, what else. if i went to 9 what extra do i usually need (which i am trying to avoid, even if i can only go 3-4psi) fuel pump, 24# injectors, different programming for the richer and less advance timing, anything else i can avoid by going 4-5 psi?
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Piano Man
Dodge Dakota
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12/18/2004
21:09:36
| RE: to supercharge it?
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If you do supercharge do you lose much milege at that 5 psi? I'm looking for 50 more foot lbs as I've added almost 1000 pounds of long box and topper to my four door. The extra wind resistance makes the stock motor work too hard unless I shift it down to fourth
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hybrid
Dodge Dakota
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12/19/2004
00:25:54
| RE: to supercharge it?
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jasonsdakota,
Do you understand how superchargers and turbo's work? Do you understand why more power is being created when you bolt on a turbo or s/c? The air that your forcing into the engine is all find and dandy but all it's doing is leaning out your air/fuel ratio UNLESS you provide more fuel. You will not be making anymore power by forcing 4-5psi or even 20psi into your engine. You need the proper air/fuel ratio to make power and if you like your engine in one piece. I'm sorry but if your planning on bolting on a compressor and running any boost without proper fuel management your an idiot, plain and simple.
To answer your question, no the injectors do not operate at 100% duty cycle, generally they (most auto makers) operate about 70% duty cycle. You never really want to run more then about 80% duty cycle if you want them to last. Thats why I run 72# (756cc) injectors in my car...
A naturally asperated engine(stock engine) runs stoich or about 14.7:1 Afr, once you start adding parts (cam.headers,intake,exhaust,etc) you want to richen that afr up a tad. With a boosted engine you want your air/fuel ratio about 12.0:1 or so in boost, and stoich out of boost. Idle is totally different. I hope for your engines sake that you don't do anything until you learn a bit more about what your doing. I've seen several engines destroyed because of lean conditions or to much timing advance under boost, it's not a pretty picture to see blue smoke bellowing out the exhaust,melted pistons,cracked cylinder walls,broken ring lands and in a few cases a hole in the block (from the rod). Luckly for me i've never done any of the above. I've put over 50k miles on my engine since the addition of a turbo, not to mention 3 years of drag racing at the local track, each year I get bolder, and get a little more agressive with the tuning, yet the engine takes it like a champ.
Do it rite or don't do it at all.
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hybrid
Dodge Dakota
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12/19/2004
00:53:26
| RE: to supercharge it?
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Piano Man, your fuel economy shouldn't be effected when your driving around normally, get on the gas a bit then your fuel economy will go down. Should'nt effect it to bad. I lost about 4-6mpg on average when I turbo'd my vehicle. I used to drive it like it was stolen, now I only drive to and from the track with it gently because I don't need any tickets.
I used to drive 60 miles per day to and from work (50 of that was freeway) I was on the gas from light to light and everytime I changed lanes (the sound of the turbo spooling and the blowoff valve was my music...literally because I have no radio in there.
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rtspeeddemon
Dodge Dakota
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12/20/2004
11:00:31
| RE: to supercharge it?
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Message:
Hybrid pretty much summed it all up.
Boosting an application is not something you guess at. It MUST be dyno tuned in and have the air/fuel ratio adjusted accordingly to insure all is okay.
5 lbs is plenty of extra air so guessing at the fuel required is not an option.
Do it right or be prepared to buy another bottom end for your motor when it melts the pistons!
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