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Re: Engine PCM/TCM conversion kit? [Re: volaredon] #3167084
08/10/23 01:50 PM
08/10/23 01:50 PM
Joined: Aug 2007
Posts: 1,819
Middle of A Field
O
OrangeProwler Offline
top fuel
OrangeProwler  Offline
top fuel
O

Joined: Aug 2007
Posts: 1,819
Middle of A Field
Originally Posted by volaredon
I have a 4.7 in a 12 reg cab long bed 1500 2wd. It's supposed to be a 10:1 310hp engine but sure doesn't seem like it. (That's oem stock specs for that engine and year. Hasn't been modded.
Driving that truck it sure doesn't seem that powerful. That's supposedly the highest HP engine I have ever had. It sure don't stem like it. The 360 in my 01 Durango sure seems to have more in it than this 4.7.
This is the first 4.7 I have ever had.
And I only got that because the 318/360 can't be had no more and I needed something new enough to qualify for a vehicle loan since I don't have the cash I can lay my hands on.


If you can get or have the desire to try a Superchips Programmer it might help. I believe with some applications, that programmer is suppose to add about 35-45hp? on the performance setting. You'll have to run 91+ fuel however. Don't have the model number on hand.

Re: Engine PCM/TCM conversion kit? [Re: OrangeProwler] #3167908
08/14/23 05:00 PM
08/14/23 05:00 PM
Joined: Nov 2022
Posts: 209
Green Bay
Andyvh1959 Offline OP
enthusiast
Andyvh1959  Offline OP
enthusiast

Joined: Nov 2022
Posts: 209
Green Bay
The 4.7HO makes ok hp and torque, by the numbers. But just looking at the numbers is kind of meaningless. The 4.7HO makes 330 ft-lb of torque, stock. So does a stock 5,2 Magnum. Yet everyone says the 4.7HO has no grunt like a 5.2 or 5.9. That's because the torque "curve", or the shape of the torque output per rpm on the 4.7HO is a sagging belly shaped. It doesn't make good torque till nearly 3,000 rpm and the peak is at 3,300 rpm like it is for the 5.2. Right after 3,300 rpm the torque output for the 4.7HO drops off fast.

By contrast the 5.2 has a humped torque curve from just off idle up to 3,300, it crests up like crescent roll up to the peak torque and then trails off much less sharp than does the 4.7HO. That's why people say the 5.2, and especially the 5.9 Magnums have so much more "pulling" power, like the power is always on. In a way it is, the torque is steadlily increasing along with RPM and HP. That makes the engine feel much stronger. The 4.7HO makes decent torque, but its a sharp increase from a low belly shape and it has a sharp peak and then drops off.

To make a 4.7HO feel strong you have to keep the revs between 2800 and maybe 3500. That's hard to do with a manual or 5-speed automatic trans. Maybe the 8-speed auto from a Ram of Charger would help to keep right in the torque range. But the 4.7HO won't connect to the 8HP-70 trans common to the Ram and Charger. But it will connect to a 318/5.2 Magnum, either of which can be built to make much more usable HP and Torque than the 4.7HO could ever hope to produce.


My 56 C3-B8 Dakota build
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