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WJ "Performance and power"

WJ burnout

Performance related links on this web site:

WJ Engine specifications / Elapsed Times

HO Engine specifications and features

FIPK (Fuel Injection Performance Kits)

Manifolds, standard and HO

Spark plug removal and installation

Other Performance links:
APSprecision.com 4.7L Performance TQ Converters 4.7L Performance TQ Converters
Dino's Jeep 4.0 performance site 4.0 performance page Comprehensive 4.0 perfomance information and specifications.
Dodgeram.org Chrysler's New Cammer An incredibly detailed tech analysis of the 4.7 engine, written by Richard Ehrenberg in 1999.
Dodge Dakotas.com Performance forum  
4x4 Wire.com Kolak Exhaust for the WJ 
KRC Performance.com 4.7 Performance page 
Jeeps Unlimited.com Speed Freaks forum  

Performance gains obtained with various mods

As compiled by Dino Savva

4.0L I-6 4.7L V-8 4.7L V-8 HO

4.0 I6 Engine

Factory power ratings
Horsepower 1993-1995: 190 @4750 rpm
1996-1998: 180 @4600 rpm
1999-2004: 195 @4600 rpm
Torque1993-1995: 225 lb ft @3950 rpm
1996-1998: 220 lb ft @2400 rpm
1999-2004: 230 lb ft @3000 rpm

ItemHorsepower gainTorque gain (ft.-lb.)
1. K&N FIPK7 
2. Bored 62mm TB3 
3. Bored 62mm TB spacer23
4. Intake manifold heatshield? 
5. HP plugs0-2 
6. Splitfire plug wires36
7. Dynomax Super Turbo cat-back exhaust79
8. High-flow cat2 
9. Tri-Y header/S-pipe10 
10. JET Stage 2 PCM8
(auto transmission)
11. Speedtweaks IAT adjuster? 
12. Electric fan conversion33
13. Ported stock cyl. head114
14. Accurate Power big valve head167
15. Crane #753901 camshaft1015
16. Raise CR from 8.8 to 9.5:18 
17. Accurate Power 4.6L stroker engine75105
18. Accurate Power supercharger8590
19. Nitrous Express kit50-7590-135
With the external bolt-ons listed above (#'s 1-12), output should be about 225-230hp. Beyond that, internal engine mods or forced induction are needed (#'s 13-19).

4.7 V8 engine

Factory power ratings
Horsepower235 @4800 rpm
Torque295 lbft @3200 rpm

ModHorsepower gainTorque gain (ft.-lb.)
1. K&N FIPK56
2. Brian Stroud's RamIT cold air intake? 
3. Kolak 3" cat-back exhaust56
4. Modified Y-pipe + 3" high-flow cat10hp 
5. Mopar Performance PCM flash98
or 6. ASE chip626
or 7. Kenne-Bell Optimizer II109
8. Flometrics 70mm TB57
9. Relocate IAT sensor? 
10. KRC Performance HO camshafts & intake manifold19 
11. Remove clutch fan + short belt PS/alternator bypass1017
12. Duner's fuel rail cooling system1629
13. Kenne-Bell supercharger99 
14. Paxton Novi-1000 supercharger10262
15. Garrett T04B turbocharger 10psi boost144 
16. Nitrous Express kit50-150 
With mod #'s 1-12, output should be about 300hp.

4.7 HO V8 engine

Factory power ratings
Horsepower235 @5200 rpm
Torque325 lbft @3600 rpm

ModHorsepower gainTorque gain (ft.-lb.)
1. K&N panel filter3 
2. K&N FIPK7 
3. Brian Stroud's RamIT cold air intake? 
4. Kolak 3" cat-back exhaust? 
5. Modified Y-pipe + 3" high-flow cat? 
6. ASE chip? 

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