| From | Message |
Cotharyus
GenI
 
8/08/2002
07:23:50
|
 Subject: RE: what is best for the 4.7l?
IP: Logged
Message:
CW - traction is such a b*tch sometimes. I have to say though, its been very little problem for me. Start with the fact that its a QC, then its got the LSD, I'm running 255/70's on it. On top of that, I have about a 250 lb tool box strap mounted in the bed against the back of the cab. You have to *want* to break this thing lose to do it. And given the cost those tires - I'd personally rather not smoke them up.
I've seen one MBRP recommendation for exhaust. Can anyone else support the claim that some form of proper single out exhaust mod (cat back, high flow cat?) won't trash my low end torque? With the intake, and plans for the cams, and possibly a super charger (based on what I'm seeing about the KB working on the low end it would probly be a KB) should I do something with the stock exhaust?
2001 QC 4x4, 4.7,5 spd, LSD, K&N Gen II Intake
|
yates-in-DE
GenIII
8/08/2002
11:34:49
| RE: what is best for the 4.7l?
IP: Logged
Message:
Conig as soon as I get the new NITRO DROP shocks back and my camera back I will post some. SORRY
My VW Killer
Lynn
|
j
Dodge Dakota
JOIN HERE
8/08/2002
12:02:47
| RE: what is best for the 4.7l?
IP: Logged
Message:
If you are thinking of getting a KB s/c, I wouldn't do anything to the intake since it will be replaced anyway.
|
Deno
Dodge Dakota
JOIN HERE
8/08/2002
17:24:58
|  RE: what is best for the 4.7l?
IP: Logged
Message:
Well i can tell you from experiance that a catbacck is not the way to go,i put a 50 flowmaster on my 2000 QC 4.7 auto. Let me tell you i have regreted it ever since,I lost 3/4 of a second to 60mph. Anyone in here who tells you that a catback system doesnt hurt torque on a 4.7 is a Phuckin liar. But hey at least it sounds good,yea right!
|
alex
Dodge Dakota
JOIN HERE
8/08/2002
17:54:55
| RE: what is best for the 4.7l?
IP: Logged
Message:
Although this has become a supercharger/forced induction/boost discussion, the original question was "what is best for the 4.7l?"
The three best things you can do for the most kick in the pants are this:
1. Computer flash. +/- $400 Remove the speed limiter, remove the rev limiter, advance the timing and custom tailor the fuel curve. Kenne Bell, ASE, and Mike Leach are some options depending on what year truck you own. This will get you loads of low, mid and high rpm power.
2. Get a 3" cat-back exhaust system and a 3" catalytic converter. +/- $250 parts & labor. The entire system should be 3" from the y-pipe to the tip of the tail pipe. This will free up huge power from about 2500 rpm all the way up.
3. Get a larger throttlebody. +/- $450 depending on the unit and company. 70 mm units from Flometrics have proven themselves to be quite a gain. They will also boost your power from about 2000 rpm on up to the shift point. A 72 mm TB is too big for a true street driver, as it makes the most power up around 6000+ rpm. That's pretty much a race only mod (unless you want to run a turbo- haahaaa).
4. Install the HO cams and HO intake manifold from the Jeep Grand Cherokee HO motor. +/- $300 total in parts. These will give the 4.7 a lot of bottom end grunt and some pretty respectable upper rpm power to boot.
So basically, for about $1400 and a weekend's worth of bolt-ons, you can pretty much get yourself a 50 hp/65 ft-lb gain. That means you'll be turning about 235 hp and about 305 ft-lb of torque at the rear wheels (in a 5-spd truck). That's been dyno proven by Matt Barret. It's pretty much 280 hp and 360 ft-lbs tq at the crank. And the factory rated this motor at 230 crank hp to begin with.
Not too bad......
As for custom grind bad-ass cams..... check the Latest News link at KRCperformance.net I think they're going to be first in the 4.7 whoop-ass department. Hughes is just behind the 8-ball really badly.
|
| | <<Oringinal Post <<Previous Page P 2 |
|
Post a reply to this message:
Username Registration: Optional
All visitors are allowed to post messages
|
