Diesel Power - - Contents - Words by KJ JONES + Pho­tos by DIESELPOWER STAFF AND BEN COOPER PHO­TOG­RA­PHY

DAY 3 of Diesel Power Chal­lenge 2018 Pre­sented by XDP fea­tured what is ar­guably the most pop­u­lar com­pet­i­tive seg­ment of the six gru­el­ing stages that com­prise the an­nual event: the wor­shipped-by-all chas­sis-dyno show­down to de­ter­mine which player’s rig is su­pe­rior when it comes to mak­ing rear-wheel horse­power and torque.

One day af­ter the Mus­tang dyno at

ATS Diesel Per­for­mance proved to be more chal­leng­ing than some com­peti­tors might have an­tic­i­pated (four drivers failed to com­plete a gru­el­ing fuel-con­sump­tion drive), our nine teams re­turned to ATS with a ton of

con­fi­dence—the trash talk among them con­firms this—and ready to take on DPC’s mar­quee per­for­mance test.

Mak­ing four-digit horse­power in the Diesel Power Chal­lenge dyno test is the op­ti­mistic per­for­mance goal most com­peti­tors have each year. And, while their trucks cer­tainly may be ca­pa­ble of mak­ing that type of big steam on their re­spec­tive “home dynos,” such vari­ables as the Den­ver area’s high el­e­va­tion (5,800 feet above sea level at ATS) and the fact

“Mak­ing four-digit horse­power in the Diesel Power Chal­lenge dyno test is the op­ti­mistic per­for­mance goal most com­peti­tors have each year.”

that our com­pe­ti­tion uses data that is not cor­rected for that al­ti­tude of­ten leave par­tic­i­pants scratch­ing their heads in dis­be­lief, ques­tion­ing the dyno’s ac­cu­racy, or try­ing to con­jure up some plau­si­ble ex­cuse for per­for­mance that falls (some­times far) be­low what they ex­pected and/or boasted about.

Ba­si­cally, where a truck might post 1,200 (cor­rected) horse­power on a com­peti­tor’s reg­u­larly used dyno (that is typ­i­cally in a lower al­ti­tude), its un­cor­rected fig­ure on the ATS Mus­tang unit will prob­a­bly be a tick less than 1,000 hp.

Un­der­stand­ably, the dif­fer­ence is dra­matic and can be a bit hum­bling (one crewmem­ber/ tuner con­fessed his pride was a lit­tle hurt by his truck’s per­for­mance on the pump). But when a team makes all the right moves when pre­par­ing for DPC Dyno Day—specif­i­cally by fo­cus­ing on cal­i­brat­ing the ECM with an op­ti­mal tune for mak­ing power in thin air and adding a lot of ni­trous-ox­ide for much-

needed ad­di­tional at­mos­phere—boasts of big power can be backed up.

Diesel Power Chal­lenge alum Dmitri Mil­lard proved this by tun­ing Kodi Koch’s (pro­nounced as “Cook”) ’01 Chevro­let Sil­ver­ado 2500HD and coach­ing Kodi (it was his first time ever driv­ing on a dyno) to a dom­i­nant win in the seg­ment (1,400.4 hp/2,417.7 lb-ft). Un­cor­rected horse­power and torque val­ues are com­bined, and the over­all to­tal is used in scor­ing this seg­ment.

There were smiles (es­pe­cially in the Koch camp), and there were frowns. But all in all, the dyno seg­ment was an awe­some dis­play of diesel-en­gine per­for­mance and great com­pe­ti­tion.

With one mighty pull, Kodi Koch's ’01 Chevro­let Sil­ver­ado 2500HD elim­i­nated any thought that the Mus­tang chas­sis dyno at ATS Diesel Per­for­mance is in­ac­cu­rate. While other com­peti­tors tried hard to make the magic "1,000 hp," Kodi's rig made blast­ing 1,400 un­cor­rected horse­power to the rear tires look easy.

Com­peti­tors lis­ten in­tently as Editor KJ Jones cov­ers the "rules of en­gage­ment" for DPC's all-im­por­tant dyno seg­ment.

We feel "smoke," the diesel hobby's neme­sis, is com­mon and ac­tu­ally OK in dyno tests, drag rac­ing, and other com­pet­i­tive events like Diesel Power Chal­lenge, that are not held on public streets.

Gar­rett Osen's ’10 Ford F-350 is an­other mem­ber of the DPC 1,000hp club. Af­ter Gar­rett sorted out a ni­trous-ox­ide is­sue, his black beauty posted a 3,036.2 com­bined horse­power/torque score.

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