Wrangler YJ 4.0 Liter 6 Cylinder Supercharger


NOTE! The supply/labor shortage has caused us delays in manufacturing. We cannot guarantee ANY shipping times but we will do the best we can. Accessory orders will ship faster than full supercharger kits.

Supercharger for 1988-1995 Wrangler 4.0 L

Clear selection

Gloss Black

Ford Red [+$249.95]

Alpine Green [+$249.95]

Cast Iron Gray [+$249.95]

Chevrolet Orange [+$249.95]

Chrysler Blue [+$249.95]

Dull Aluminum [+$249.95]

Cummings Beige [+$249.95]

GM Blue [+$249.95]

Satin Black [+$249.95]

Steel Blast Gray [+$249.95]

Universal Silver [+$249.95]

Universal White [+$249.95]

Flat Black [+$249.95]

Ford Blue [+$249.95]

Ford Gray [+$249.95]

Ford Merc Blue [+$249.95]

SKU: BTM90FTC121YJ40TM Categories: ,


Safe, reliable, affordable, hard-wire direct to ECM
Low boost, instant boost, no lag
Easy install, 3-4 hours typical install
*4-7 pounds boost on the stock 4.0L
Works and has been tested at all altitudes
Utilizes a modified GM 3.8L Eaton M90 supercharger
Rotor pack and nose drive are easily rebuildable
Retains A/C!  No relocation of any engine components, uses stock tensioner pulley
Will work for ‘strokers’ 4.5+L engines, but expect lower boost, +20-25% increase power
Fully compatible with all bolt-ons, 62-70mmTB, cat back exhaust, 703/784 injectors, roller rockers, even cam and ported big valve heads
Completely stock EFI settings and function when not in boost
7th injector, 60lbs/hr, provides additional fuel under boost and liquid intercooling effect
Split Second FTC controls boost timing retard and auxiliary 7th injector control
FTC is fully laptop programmable
FTC comes with base tune pre-loaded
FTC must be spliced into your jeep’s existing wiring harness
FTC has enrichment built-in to force a safe AFR under low load/boost situations
FTC is legal only for racing vehicles which may never be used upon a highway
Green Filter cleanable filter element is included
Free remote tuning if you have an AFR gauge and tuning cable
*Requires ’99 or newer intake manifold with 3 bolt power steering pump and tensionner bracket. Manual transmission models may require smaller single diaphragm brake booster from 87-90 YJ due to the 4″ clutch master cylinder spacer.
*Return-style requires 97+ fuel rail and addition of external fuel pressure regulator (The AFPR1 works very well. Ask if you need us to provide one for you.)

* altitude dependent. unit comes with standard pulley, higher boost pulleys can be purchased under accessories.


  1. Austin

    I just wanted to tell you how happy I am with the SuperCharger. First off let me tell you about my Jeep. It’s a 93YJ with a factory 4.0, 6 speed and transfer case out of a Rubicon. It has 1 ton axles and 5:13 gears turning 40″ tires. These things weigh 150lbs with wheels. The whole Jeep is 4600lbs. Needless to say it was way under powered for living in Colorado and just about any other place. To drive from my house in Durango to Silverton/ Ouray I would have to gear down to 3rd just to keep it around 45mph. Yesterday after swapping controllers, I was able to drive the same passes in 5th sometimes hitting 70mph! I was blown away. I actually had to back out of the throttle?! My girlfriend is the one who talked me into the SuperCharger instead of the V8 swap. I’m glad I went with the SuperCharger, it’s a torque monster. The girlfriend a keeper, by the way.
    Off-road is just like on road. The SuperCharger makes tons of power that is usable almost all the time. It makes climbing easier and keeps the motor from bogging down. This is especially important when you wheel at 12,000 ft. It just plan works everywhere.
    Yes it has been trying at times but in the end, it was well worth it. My Jeep is a Beast!
    Thanks for all of your effort and hard work. You make a great product that I am proud to tell people that I have.
    If you or anyone else need more info on my install don’t hesitate to call.

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