It’s not that common of a sight to see a Jeep Wrangler strapped onto a dyno, so if you ever do, there is probably a very good reason behind it. Like this Cummins-power JK Wrangler, for example. Florida-based Bruiser Conversions swapped the Wranlger’s stock 3.6-liter with a 3.8-liter Cummins ISF four-cylinder turbo diesel, and then gave it a date with the dyno to find out what kind of monster they had created.
And what a monster she is. According to this dyno run, the diesel Wrangler laid down 228 hp and 485 lb-ft of torque at the rear wheels with peak hp comes in at about 2,600 rpm, while max torque kicks in at around 2,000 rpm. For comparison, a stock 2014 Jeep Wrangler puts out 285 hp (209 kW) at 6,400 rpm and 260 lb-ft (353 Nm) of torque at 4,800 rpm.
When the swap was first announced back in May, initial engine estimates put output at around 170 hp and 470 lb-ft of torque. After adjusting the pressure of the fuel rail and making some other “mild accessories modes,” the final output was achieved. Better yet, the swap kit uses a custom bellhousing to pair the Cummins four-cylinder to the Wrangler's factory automatic transmission.
Bruiser Conversions is located in Clearwater, FL, and in addition to its diesel swaps for the Wrangler, the shop is also known for dropping a Chrysler Hemi V-8 engine under the hood and even LS engines from a Chevrolet Corvette.
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