![\"NHRA](\"http:\/\/www.racingjunk.com\/news\/wp-content\/uploads\/2017\/09\/Pro-Mod-NHRA-Rules-Feature.jpg\")
On the eve of the 10th annual NHRA Carolina Nationals, series officials broke an earlier promise made to drivers and teams competing in the J&A Service Pro Mod Drag Racing Series.<\/p>\nOn the eve of the 10th annual NHRA Carolina Nationals, series officials broke an earlier promise made to drivers and teams competing in the J&A Service Pro Mod Drag Racing Series.<\/p>\n
Surprising drivers, the National Hot Rod Association made several sudden and unexpected changes to the pro mod class, primarily that turbo-charged entries will lose two pounds of boost, from 38 to 36 psi.<\/p>\n
According to officials, these changes were necessary to adjust for performance advantages that one particular engine combination might have over another.<\/p>\n
\u201cIn Pro Mod we have three engine combinations: nitrous, supercharged and turbocharged. We specifically look at the average of the four quickest ETs of each of the three engine combinations at each race. When any of them gets more than a three hundredths advantage in ET at a number of races we typically make a rule change to bring the three combinations closer together in performance,\u201d said Vice President of Technical Operations for NHRA Glen Gray.<\/p>\n
“In this case the turbocharged combination had a more than three hundredths difference in performance over the supercharged combination and a greater than four hundredths difference over the nitrous combination over the past five races. While we don’t like to make changes this late in the season, we still have 25 percent of the Pro Mod season left.\u201d<\/p>\n
This is a massive power hit for competitors like two-time series champion Troy Coughlin.<\/p>\n
![\"2017](\"http:\/\/www.racingjunk.com\/news\/wp-content\/uploads\/2017\/09\/Troy-Coughlin.jpg\")
<\/p>\n
\u201cWith just three races left in our season the timing of this decision is tough, but it’s the NHRA’s sandbox so they can do whatever they want I suppose,” said Coughlin.<\/p>\n
\u201cWe actually started hearing this rumor a week or so ago so we figured they would target the turbo-charged cars, so we went to work right away to try and find different ways to make power. Eric Dillard and his crew at Proline Racing Engines have been very proactive and we’re fighting back the best we can.\u201d<\/p>\n
It remains to be seen\u00a0how this rule change will affect this weekend\u2019s Pro Mod race outcome.<\/p>\n
Stay tuned to RacingJunk.com for the latest on all things NHRA.<\/p>\n","protected":false},"excerpt":{"rendered":"
The NHRA has made an abrupt rule change to the Pro Mod class prior to this weekend’s Carolina Nationals.<\/p>\n<\/div>","protected":false},"author":39,"featured_media":43759,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[3465,3470,5029,3399],"tags":[4946,5529,7,1666,5528,5530],"class_list":["post-43756","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-drag-racing","category-news","category-racing","category-nhra","tag-2017-nhra-mello-yello-series","tag-2017-rule-changes","tag-nhra","tag-pro-mod","tag-rule-changes","tag-troy-coughlin"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/www.racingjunk.com\/news\/wp-content\/uploads\/2017\/09\/Pro-Mod-NHRA-Rules-Feature.jpg","jetpack_shortlink":"https:\/\/wp.me\/p42YSK-bnK","jetpack_sharing_enabled":true,"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/posts\/43756","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/users\/39"}],"replies":[{"embeddable":true,"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/comments?post=43756"}],"version-history":[{"count":3,"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/posts\/43756\/revisions"}],"predecessor-version":[{"id":43762,"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/posts\/43756\/revisions\/43762"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/media\/43759"}],"wp:attachment":[{"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/media?parent=43756"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/categories?post=43756"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/tags?post=43756"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}