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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:
Name Link Content
Dino's Jeep 4.0 performance site 4.0 performance page Comprehensive 4.0 perfomance information and specifications.
Dodge Dakotas.com Performance forum
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
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 ?


 

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