Welcome to the JeepSpecs.com feature of WJ Generation Jeep Grand Cherokee performance and power options. Want to feature your Jeep? Please get in touch with us and tell us about it!
Performance related links on this web site:
WJ Engine specifications / Elapsed Times
HO Engine specifications and features
FIPK (Fuel Injection Performance Kits)
Spark plug removal and installation
Other Performance links: |
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| 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 | |
| 4×4 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
| 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 |
|
Torque |
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
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| 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 | |||||||
4.7 HO V8 engine
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| 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 | ? | |||||||