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Performance related links on this web site:
WJ Engine specifications / Elapsed Times |
| Other Performance links: | ||
| Name | Link | Content |
| 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 | |
| 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 rpmTorque 1993-1995: 225 lb ft @3950 rpm
1996-1998: 220 lb ft @2400 rpm
1999-2004: 230 lb ft @3000 rpm
Item Horsepower gain Torque gain (ft.-lb.) 1. K&N FIPK 7 2. Bored 62mm TB 3 3. Bored 62mm TB spacer 2 3 4. Intake manifold heatshield ? 5. HP plugs 0-2 6. Splitfire plug wires 3 6 7. Dynomax Super Turbo cat-back exhaust 7 9 8. High-flow cat 2 9. Tri-Y header/S-pipe 10 10. JET Stage 2 PCM 8
(auto transmission) 11. Speedtweaks IAT adjuster ? 12. Electric fan conversion 3 3 13. Ported stock cyl. head 11 4 14. Accurate Power big valve head 16 7 15. Crane #753901 camshaft 10 15 16. Raise CR from 8.8 to 9.5:1 8 17. Accurate Power 4.6L stroker engine 75 105 18. Accurate Power supercharger 85 90 19. Nitrous Express kit 50-75 90-135
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
Horsepower 235 @4800 rpm
Torque 295 lbft @3200 rpm
Mod Horsepower gain Torque gain (ft.-lb.) 1. K&N FIPK 5 6 2. Brian Stroud's RamIT cold air intake ? 3. Kolak 3" cat-back exhaust 5 6 4. Modified Y-pipe + 3" high-flow cat 10hp 5. Mopar Performance PCM flash 9 8 or 6. ASE chip 6 26 or 7. Kenne-Bell Optimizer II 10 9 8. Flometrics 70mm TB 5 7 9. Relocate IAT sensor ? 10. KRC Performance HO camshafts & intake manifold 19 11. Remove clutch fan + short belt PS/alternator bypass 10 17 12. Duner's fuel rail cooling system 16 29 13. Kenne-Bell supercharger 99 14. Paxton Novi-1000 supercharger 102 62 15. Garrett T04B turbocharger 10psi boost 144 16. Nitrous Express kit 50-150 With mod #'s 1-12, output should be about 300hp.
4.7 HO V8 engine
Factory power ratings
Horsepower 235 @5200 rpm
Torque 325 lbft @3600 rpm
Mod Horsepower gain Torque gain (ft.-lb.) 1. K&N panel filter 3 2. K&N FIPK 7 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 ?