And one more question. What's the horsepower at the wheels and also the crank for a stock '07 4.7L V8 Magnum?

 

I think the 07s are rated 230 at the crank for the 4.7 non-HOs and 260 for the HOs. I am not sure on the whp, I would guess 10-15% less than the crank, so 195.5-207whp for non-HOs and 221-234whp for the HOs

 

hmm...I remember seeing all the differences the HO engine has as compared to the 'regular' 4.7. Not sure if it was this board or another. I will have to see if I can find it. I think I remember different cams though.

 

Engine differences from the 4.7l to the 4.7l H.O. (taken from wjjeeps.com):

1. Block: Detonation sensor bosses in the valley
2. Camshaft: Custom profile lobes (designed for increased performance)
3. Connecting rods: Modified, with floating wrist pins (vs pressed-fit pins in standard 4.7)
4. Crankshaft: Forged steel (vs cast iron in standard 4.7)
5. Crankshaft damper: unique to H.O.
6. Cylinder heads: different shaped combustion chambers (for improved airflow). The letters "H.O." are cast on the front end of the heads.
7. Fuel injectors: higher flow (+3.3 lb/hr)
8. Intake manifold: modified (shorter runners)
9. Intake: low-restriction intake system (different resonator, air filter, air filter hose and housing)
10. Knock sensors: two, stereo
11. Main bearings: tri-metal (vs bi-metal in standard 4.7, designed specifically for the HO engine)
12. PCM calibration : unique programming
13. Pistons: dome shaped for increased compression ratio
14. Spark plugs: platinum tipped
15. Valves: unique exhaust valves (same lift as standard 4.7)
16. Valve springs: upgraded valve springs (intake & exhaust. Larger diameter wire and more coils)

Keep in mind that this list is compiled for the 4.7HO used in the Jeep Grand Cherokee's and there may be some differences in ours. I would expect it to mostly be the same though.

 

Well those other differences would also help the HO accept more power adders without changing the internals. Put it this way: I wouldn't want to try running the amount of boost Blown is running on my non-HO without upgrading the internals.

 

Billy, I've been reading that about 20% of the horsepower is lost, due to the automatic trans, and the drivetrain length... so you're looking at more like, 165hp at the wheels...

I put down, 197 in mine, and that was just with the intake and no mufflers... and that's with the manual... I know you're not putting down manual numbers with a dodge's automatic transmission...

There is NO way that's happening...

 

Let's say it is 20%. Then....
Frenchy we need to get you a math tutor son... a 20% reduction to 230 is not 165 hp, its 184 hp. I'll tell ya this summer what shes getting. I plan on Dynoing it with and without the tuner. All thats been done is the intake and the exhaust. So we will see... in the mean time study hard