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Naturally-aspirated horsepower not enough?
Force-feed your engine with either a supercharger, turbocharger or nitrous oxide kit. This is the single most effective method to achieve a large torque increase from your engine without increasing the engine displacement.
This is real bolt-on power without needing to modify the engine internally.
For the ultimate horsepower/torque increase, you can even add any of these power adders to your stroker engine.
505 Performance Jeep 4.0 YJ/TJ Turbo Kit
NEW Turbo kit for '91-'06 Jeep 4.0 Wranglers from 505 Performance
Garrett SuperT 60 Modified Turbo air cooled 6.5psi maximum boost
Fuel management system from Split Second
Complete Exhaust from header to converter
All Stainless or quality braided hoses
Stainless T-bolt Clamps
Oil pan-gasket one piece
Boost Gauge and hardware
All necessary air intake system including high flow K&N
Stock TJ: 148.8rwhp/191.3rwtq
Turbo TJ: 214.2rwhp/280.7rwtq
Available for 1987-1995 Wranglers, Cherokees and Grand Cherokees with a 4.0L engine (w/o ABS brakes) and 1997-2002 TJ's.
This is the ultimate bolt-on performance product available on the market for Jeep today. The Supercharger kit can be installed in a weekend by anyone with basic mechanical knowledge. Bring out 275 hp. and 305 ft.lbs. of torque in your Jeep in a week-end.
The kit is complete with all adapters, mounting hardware, drive belt and instructions.
Not advised for high mileage or engines in poor running condition.
Stock # HES40SC
Kenne Bell has just introduced a twin screw supercharger with intercooler for the Jeep Wrangler 4.0. HP/TQ numbers are:
Stock TJ: 148rwhp/201rwtq
5.5psi street: 214rwhp/307rwtq
8.5psi competition: 252rwhp/362rwtq
Our inlet manifold accepts up to 70mm throttle sizes (stock is 60mm). The dedicated Kenne Bell Cool Air Kit produces yet another 13HP over the stock restrictive inlet system. The whisper quiet Kenne Bell Superchargers feature a self contained oiling system. Punching holes in the engine oil pan is not required to lube the supercharger. Larger 42 lb injectors, a re-calibrated stock ECM, and the Kenne Bell OPTIMIZER II are required. Without these, "flatline" AF ratio and linear power gains throughout the rpm range are not possible. Finally, the kit is 50 State Legal and is easy to install.
No longer sold.
Our supercharger system utilizes the most efficient positive displacement compressor in the world, the Autorotor.
As if the Autorotor wasn't enough, our supercharger system is also intercooled! Our intercooler is a patented air to water heat exchanger used by some of Europe's best racing teams. The intercoolers water circuit is independent of the engine cooling system. A small centerfugal pump circulates water through the intercooler and supplemental radiator in an endless loop.
Our system is set at 6 psi, it would take an Eaton system using approximately 9psi to make the same power! Additional fuel on boost is injected via a 600cc/min injector controlled by a microprocessor. The microprocessor is a true "3D" mapped system, using engine speed and load (boost) to calculate the precise amount of fuel to inject. All factory accessories stay in place and no routine maintenance items are obscured by the installation.
Nitrous Express nitrous oxide kit
JEEP 4 & 6 CYL. EFI SYSTEM Part # 20920-10
10lb. bottle with Pure-Flo valve
Lifetime guaranteed large solenoids
Hinged steel bottle brackets
14 foot stainless steel braided supply line
Heavy duty 40 amp anti-flyback relay
All necessary hardware
It's sold at Summit Racing under the part no. NEX-20920-10 and at Hesco. DYNOmite chassis dyno tests show a 65hp/100lbft gain at the rear wheels (~76hp/117lbft flywheel) of a 4.0 TJ when using the maximum recommended (for internally stock engines) 75hp kit.
Venom VCN-1000 nitrous oxide system
Jeep, Cherokee, Wrangler, Grand Cherokee, 4.0L kit Part # N48-137
VENOM VCN-1000 computer controlled nitrous oxide kits practically run themselves. All you have to do is set the nitrous flow by choosing one of the four nitrous nozzles supplied with the kit (25, 50, 75, or 100 additional horsepower). The kits are designed to cut off nitrous flow automatically if the air/fuel mixture becomes too lean. Plus, they adjust fuel flow through the injectors, so you don't have to modify the vehicle's fuel pressure. VENOM VCN-1000 computer controlled nitrous oxide kits are ideal for return-less fuel systems.