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hemi kota
Dodge Dakota
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1/10/2004
16:37:28
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 Subject: any performance parts for the 4.7?
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it seems to me from checking out this site most upgrades arent worth the $ paid for what little difference they make. for a newer motor in a popular mass produced truck, ther isnt a whole lot of performance upgrades that can be done. to spend 3 or 400 $ on an upgrade just to get 5hp sucks. is there any real prformance mods that can be done to get some kind of return? i dont care about gas savings, if i did i would have bought a 4cyl. i have a 2000 dak with 4.7ltr and 3.92 gears and a 5 speed, homebrew air intake, autolight plugs, so whats next? is the 68mm throttle body upgrade make a difference? let me here something posotive.
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billsdak
Dodge Dakota
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1/10/2004
23:24:02
| RE: any performance parts for the 4.7?
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a set of headers on ebay cheap:
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2453573531&category=33631&rd=1
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hehe
Dodge Dakota
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1/10/2004
23:36:41
| RE: any performance parts for the 4.7?
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Bore it, stroke it, and supercharge it....not cheap, but it will go like hell. Dont think they make a stroker crank for them yet though. sorry just bored
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Kowalski
Dodge Dakota
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1/11/2004
08:33:25
| RE: any performance parts for the 4.7?
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Hemi kota - disregard that nonsesnsical post about the headers. With the 4.7 stock exhaust manifolds already flowing within 2% of headers, this is exactly what you seem to be complaining about. Instead try a cam change - you will see real results there. Know what your total timing is ? I saw a nice gain with the Leach flash for my 2000 auto, bumped it up to 34 degrees. I think the manual trucks may come with more spark advance, how much more advance you would get will tell if this might be a good mod for you too.
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hemi kota
Dodge Dakota
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1/11/2004
10:24:22
| RE: any performance parts for the 4.7?
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kowalski, i dont know a whole lot about these new mods out now, still learning. i guess im used to changing distributors and advancing the timing the old school way. so you're saying this leech thing will do this through the computer module? what does it cost, were do you get one, and is the bang for the buck gonna show? thanks for the education, im starting to learn something.
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kowalski
Dodge Dakota
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1/11/2004
10:54:59
| RE: any performance parts for the 4.7?
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It's about $400 and you have to send your PCM to CA to have it done. I thought it was worth it. I got a ported 68 mm TB from a guy with a manual tranny like yours, he thought he saw more from that than the flash but my experience was the opposite; that's why I say to compare what your advance is now to what is available. There are a couple other flashes available but I've never seen anyone post how much advance they give. This site has a good search engine; try "HO cams", "Leach Flash", and "4.7 PCM flash", also check out KRC performance's web site for info on what other cams are available. Especially with the HO cams, a reading of the old posts will show the mistkes others have made doing that mod and what to watch for. It went smoothly for me. There are some good mods for this motor.
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hemi kota
Dodge Dakota
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1/11/2004
11:22:50
| RE: any performance parts for the 4.7?
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cool, thanks for your help. the pc flash doesn't sound like something i would want to do. i wish there was a plug in available. i dont like to do anything i cant put back to orig equipment. the 68mm throttle body is on my list though. does it being ported make a big difference? i mean if i can find a 68mm tb from a junk yard it should make a noticeable difference without port and polishing or no? i know performance doesn't come cheap. thanks again.
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GraphiteDak
GenIII
1/11/2004
14:35:03
| RE: any performance parts for the 4.7?
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What sucks is the 2003 4.7 has a diff PCM than the 2000 thru 2002. I haven't found crap for PCM's. I wish they would make a Hypertech Programmer work on it. I'm sure enough people would buy that in a heartbeat!
However, the 2003 4.7's got the same intake and throttle body as the HO 4.7's in 2003. So that gives me two mods included as I look at it.
I wonder if the 2003 4.7's have a slightly higher rating than 235 which was rated for the previous years? Someone said they may but DC didn't bother to re rate it or whatever.
I just need the cams and I should be about a stock HO. I hear the cams make a noticable difference. At least when using the BUTT-DYNO.
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Silver
Dodge Dakota
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1/11/2004
22:06:11
| RE: any performance parts for the 4.7?
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What do you mean disregard that nonsensical post about the headers? I've heard this crap for along time, "the 4.7 stock exhaust manifolds already flowing within 2% of headers". What headers are you talking about? They are not all the same. One of the best modifications I have done is the Gibson headers. It was even more noticable than the HO cams.
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Gold
Dodge Dakota
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1/12/2004
15:50:17
| RE: any performance parts for the 4.7?
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When there is dyno evidence to back up your claim like there is for the cams, you'll be believed. Prove it.
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Demon Dakota
DakotaEnthusiast
1/12/2004
19:27:25
| RE: any performance parts for the 4.7?
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You can't just say that the "stock manifolds are within 2% of headers". If you just add off the shelf headers for the 4.7L and change nothing else, then yeah, you "might" be correct. If you remove the stock Y pipe and stock manifolds, then add long tube headers connected to a true dual exhaust system, you're going to flow almost 100% more total exhaust over a one minute period of elapsed time. Granted, if you did go this route and kept the intake/TB/head/valve/cam components, you'd lose a ton of exhaust velocity (and thereby HP/TQ). If you have the components to match up with this type of more radical exhaust, then you're in business. So please, don't generalize. You can say currently available products only flow about 10-15% better than the stock exhaust manifolds (b/c that's the truth), but most people change more than just headers/manifolds when doing this sort of work...
True Dual exhaust and removed third cat
HO Cams & HO Intake
FASTMAN 70mm TB
Autolite 3923 Plugs
TPS @ .76 VDC
IAT Adjuster Mod
Custom tranny VB Mod
Demon long tube headers
Ported/polished heads w/ 1.92" Intake/1.60" Exhaust Valves
One dead stock LSD unit (POS...)
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Trolls Gold
Dodge Dakota
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1/12/2004
23:39:36
| RE: any performance parts for the 4.7?
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http://www.kennebell.net/techinfo/dodge-jeep-chrysler/bolton-dyno-test-data.pdf
Notice the 4.7 under headers.
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Kowalski
Dodge Dakota
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1/13/2004
16:28:14
| RE: any performance parts for the 4.7?
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Good link - shows gains for their optimiser. Too bad they don't say how much advance they settled on. I wonder if it is the same as the Leach - has anyone measured to compare ? Demon - you've done a great job with your mods, you're obviously someone who understands mods like that need to work together. Lets be clear when you talk about currently available mods, those long tube headers you fabricated yourslf are really only available to someone capable of doing that. I'm sure those would outflow the stockers quite favorably. However, some of the best gains for the $ for the 4.7 are the cams and more spark advance. Please don't think I'm putting what you've done down if I generalise on that; when long tube headers come available for the 4.7, I will be very interested.
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