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Sixth Annual Modified Tuner Shootout - Dyno + Emissions + dB

As Shakira famously sang, “The dyno don’t lie.”

Modified Staff
Aug 16, 2012
Photographer: Kyle Pope
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Our version of Groundhog Day involves flying to Phoenix and putting the tireless Tony Szirka and his UMS Tuning Dynapack dyno through their paces for the first event of the Shootout. If our eyes water from the exhaust fumes and the hair on the backs of our necks stands on end from the sound of a highly tuned engine bouncing off the rev limiter, we know spring has arrived.

This annual springtime tradition has also proved to be the perfect way to start the Shootout because UMS is such a gracious host and because we get to take a very close look at every car in the competition. The teams also get to rub shoulders and size each other up in a no-BS environment because, as Shakira famously sang, “The dyno don’t lie.”

Just like at the previous five Shootouts, for the purposes of scoring, we totaled horsepower in 100-rpm increments across the best 3,000-rpm range for each team. Our logic here is pretty simple: Usable power in the rpm range the engine will typically operate in while out on the autocross course, racetrack, or dragstrip is all that matters.

Peak horsepower and torque figures are really only for bragging rights, but since we enjoy some booze-enhanced bench racing almost as much as Snail Performance’s Travis “Sauce Bauce” Barnes, we’ve also included these numbers for your viewing pleasure.

Full-Race’s R14, powered by a seriously sweet-sounding RB26DETT out of an R33 Nissan Skyline GT-R, took top honors in both the power-under-the-curve scoring and the bench racing peak horsepower category with a total horsepower of 19,696 and a peak horsepower of 704. That’s some serious jam right there, good enough for the maximum 25 points for the event. Dragan Rasuo’s privateer Mk IV Toyota Supra TT was also a monster on the dyno, posting the highest peak torque value of the day (673 lb-ft to go along with 685 whp) and the second-best total horsepower score of 18,845. Science of Speed’s daily-driven, turbocharged NSX took Third thanks to a rock-solid horsepower total of 17,803 and an impressive 665 whp at its peak. Sportcar Motion/MAR Financial’s K24-swapped FA5 Civic Si sedan was the top FWD performer on the dyno with 7,407 total horsepower and 270 naturally aspirated ponies at its peak.

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These new tests were conducted immediately after the power-under-the-curve test on the dyno, using a five-gas analyzer tailpipe sniffer and NASA AZ’s dB meter.

This year we (meaning Jeremy Ward, who was also our NASA AZ group leader at Firebird the following day) also had some extra work to do since we’ve added an emissions test and a dB exhaust sound level test to satisfy our street car requirements. These new tests were conducted immediately after the power-under-the-curve test on the dyno, using a five-gas analyzer tailpipe sniffer and NASA AZ’s dB meter.

In hindsight we should have made both the emissions and the dB tests a pass or fail affair, where a fail would result in a five-point penalty applied to the team’s overall Shootout score (an approach we’ll almost certainly implement next year). But instead we opted to score the emissions test data—we only used HC and NOx to keep things simple while still getting a good sense of which teams were hugging Mother Nature and which were assaulting her—the same way we score the timed events, with the winner taking max points and the remaining teams being scored on a percentage basis against the winning value. As you’ll see from the emissions scores, this approach resulted in some pretty wacky points totals, but it still served as a meaningful way to differentiate between the cleanest and dirtiest machines in the competition.

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The exhaust dB test results were much more straightforward, with every team passing the test (we set the standard at 95 dB, per California law). This meant no teams were penalized as noise violators, but it was still interesting to see that MazdaManiac’s RX-8 was closest to the limit (at 94 dB) in typical screaming rotary fashion, while Hasport’s V6-swapped CRX was whisper quiet at 80 dB.

Hasport’s CRX was also the cleanest machine overall during the emissions testing, and this had a rather significant effect on the battle for the FWD class trophy, as you’ll soon see. Science of Speed’s NSX was cleanest on the hydrocarbon portion of the e-testing, an amazing accomplishment given its power output.

As a result, the SoS NSX leapfrogged the Full-Race R14 for the points lead heading into the speed events at Firebird Raceway.

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Power Under the Curve
RANK TEAM PUC POINTS
1 Full-Race R14 19696 25.00
2 Dragan Supra 18845 23.92
3 SoS NSX 17803 22.60
4 FAT/Snail WRX 14508 18.41
5 Whelan GT-R 11386 14.45
6 Mann Type-25 CS 10183 12.93
7 Gates 311RS 9578 12.16
8 Bonanni 370Z 8162 10.36
9 Novak S2000 8161 10.36
10 MazdaManiac RX-8 8151 10.35
11 SCM Si Sedan 7407 9.40
12 Gruppe-S tC 6192 7.86
13 Hasport CRX 6092 7.73
Emissions
HC TEST NOX TEST
TEAM PPM POINTS MG/M3 POINTS
Hasport CRX 12 2.08 11 5.00
Mann Type-25 CS 29 0.86 1 5.00
Gates 311RS 36 0.69 1 5.00
Whelan GT-R 45 0.56 1 5.00
Bonanni 370Z 47 0.53 1 5.00
SoS NSX 5 5.00 50 0.10
Gruppe-S tC 7 1.47 10 0.50
MazdaManiac RX-8 55 0.45 10 0.50
SCM Si Sedan 431 0.06 7 0.71
FAT/Snail WRX 193 0.13 10 0.50
Full-Race R14 263 0.10 30 0.17
Novak S2000 339 0.07 30 0.17
Dragan Supra DNF 0.00 DNF 0.00

By Modified Staff
43 Articles

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