Jeep WJ Grand Cherokee Performance And Power Options

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)

Manifolds, standard and HO

Spark plug removal and installation

 

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  
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

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
 

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

 

 

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

 

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 ?