Get a Grip
Gaining more consistent boost with a Whipple 10-rib belt drive upgrade
By Steve Turner
Photos courtesy of Lethal Performance
We haven’t checked in on Lethal Performance’s 2015 Mustang GT project in a little while, but if you have followed our coverage so far you know the car quickly escalated from bolt-ons to nitrous to a supercharger. It has since run a 10.53 at 135 mph on the quarter mile. Of course, that isn’t the end of the road for this project.
In fact, there are more aggressive mods in the plans for this project, but before things get really wild, the Lethal team wanted to maximize the existing combination. With more trips to the track in mind, they wanted to ensure that there was no boost-robbing belt slip. To head that off at the pass, the car gained one of Whipple Superchargers 10-rib belt drive upgrades (PN WHP-WB-COY10-15; $1,500).
“We’re always looking to take things to the next level and it’s no different with the new 2.9-liter Whipple kit. Although we really didn’t experience any belt slip at the stock 11- to 12-psi range we knew we would probably see some once we started upping the boost with a smaller pulley,” Jared Rosen of Lethal Performance explained. “So it was a good idea to tackle that problem with the 10-rib setup Whipple designed. Their kit was complete and fairly easy to install and no there’s no worrying about whether we’ll see boost loss when going down the track at higher boost levels.”
The kit in question is a bolt-on replacement for the standard six-rib drive. It features all the necessary 10-rib pulleys, tensioners, idlers, and belt for the swap. And, not only does the kit’s wider belt reduce belt slip, but its crank pulley helps produce more boost with the same blower pulley size. That’s because the heart of the kit is a 10-rib, 20-percent-overdriven damper from ATI.
“The car hasn’t been to the track with the new belt setup however on the dyno our tuner Ken Bjonnes of Lund Racing said that the higher boost levels were much more consistent and held better than before,” Jared added.
With reduced belt slip and more consistent boost, the new belt drive is ready to help push this project to its next level of performance. We can’t wait to see how this car runs with more boost, but to see how it gained more blower belt grip at Power by the Hour in Boynton Beach, Florida, keep on reading.