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Building a 10-Second 2018 Mustang with Mail Order Parts

HOT ROD logo HOT ROD 8/23/2018 Jason Sands
2018-Mustang-track-test-001
2018-Mustang-track-test-001© Hot Rod Network Staff 2018-Mustang-track-test-001

The Baseline

First up was a trip to the scales and to the dragstrip, to see what they would be working with. The weight of the no-option car did indeed seem lighter than most at a curb weight of 3,680 pounds, which would hopefully lead to quick elapsed times. Next up was a bone-stock pass at Sacramento Raceway, which would give Paramount Speed owners, Steve Ellis, and Michael Ayers, an idea of just what their stock 5.0 could do. Traction was less than optimal at the street-legal Wednesday night drags, but the Mustang still managed a 12.18 at 119 mph, with a 1.96 60-foot time.

Engine Modifications

If you can remember the old days of Fox-bodied Mustangs, you may remember that extensive cylinder head and camshaft modifications were needed to make big power. Well, thanks to technology, that's no longer the case! Rated at 460 flywheel horsepower from the factory, the 2018 models are already stout, but there's room for more. A big jump in performance came from a Paramount Speed programming change, which allowed the use of E85 fuel (85 percent methanol or ethanol and 15 percent gas) in the Mustang. E85 is less energy dense than gasoline but can make better power thanks to a richer stoichiometric air/fuel ratio. Compared to pump gas, E85 is usually worth a good 10-15 percent jump in power, plus more aggressive tuning can be realized thanks to its 105 octane rating. Ellis also freed up the intake and exhaust tract of the engine with a set of long-tube headers, including a cat-back system from MBRP. The factory throttle-body was ported and intake casting was cleaned up (yielding a 12-percent increase in flow) and the engine was outfitted with a simple high-flow air intake. All of these modifications picked up nearly 80 horsepower at the wheels, going from 410rwhp to a strong 488rwhp.

Other than the tune, the second biggest factor in dropping the 2018's elapsed time was a switch from the factory wheel and tire combination to a set of lightweight wheels with Mickey Thompson Drag Radials. Up front, the factory wheel and tire setup were replaced with a set of 17x5-inch Weld Wheels RT-S wheels, along with 26x6-inch Mickey Thompson Sportsman tires. Out back, much wider 17x10-inch Welds were outfitted with 305/45-17 E.T. Street R drag radials. The advantage of the wheel and tire change was three-fold, as there now would be more traction out back, less rolling resistance up front, and less weight all around. Ellis wasn't done however, as a last-minute addition of Baer brakes dropped another big chunk of rotating weight off of the Mustang.

The big news for the 2018s was the addition of a wild 10-speed automatic, that would only have a little over a 1,000-rpm drop during most gear changes, keeping the engine directly in its powerband. Just like the engine, the transmission received tuning too, but other than that, it's bone stock, including the stock torque converter. Ellis did at a QA-1 driveshaft however, to reduce rotating weight and enhance smoothness. There was also a gearing change, as the factory 3.15:1 pumpkin was replaced with deeper 3.55 gears that would help get the car out of the hole. The final step entailed installing a full BMR suspension kit which makes the car hook "with all the power we can launch with," notes Ellis.

10.98 at 127.5 mph!

"Our first ever pass with the Mustang was an 11.66 at 125 mph," notes Ellis. "We kept changing little things in the tune and the launch and finally got it to run 11.0-11.1 consistently," Ellis adds. Then one magical run everything clicked with the 60-foot time, the track, and the air density (which was still over 2,000 feet), and the Mustang stormed to a 10.98 at 127 mph. The short time was a 1.67, and the eighth-mile was 7.12 at 103 mph.

What's Next?

With the Mustang already in the 10s, the team is unsure just how much of an e.t. drop they can accomplish, but the hope is that it's substantial. "We'll be stretching the limits quite a bit, especially the stock fuel system," says Ellis. But, we're working on talking to companies about camshafts, converters, and engine intakes geared for higher rpm. Are mid-10s in the cards? We may just find out.

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