1991 GMC Syclone - Ride Of The Valkyries

Sweden Native Robert "Mr. Syclone" Pothorcki Runs 8s & Takes Title Of World's Fastest AWD SY

The airy side of the mixture is provided by a specially designed PTE GT45 ball bearing turbo (spooling around 28 psi), cooled by a custom PTE air-to-air intercooler. When Robert gets a chance to retune the FAST computer, he will also be running a 70 horsepower shot of nitrous (from an NOS kit) to further aid cooling. A Crane HI-6 Digital Ignition box, high output coil, and MSD billet distributor do the igniting. Unneeded air and exhaust is routed through an HKS GTI 60mm wastegate, custom stainless steel turbo headers, and a full 4-inch stainless exhaust. Believe it or not, this truck is street driven and meets Sweden's strict emissions laws (provided that Robert has the cat on during testing), so there are no dumps-a Borla muffler resides aft of the 4-inch downpipe and mid-pipe.

A heavy-duty 4L80E electronic overdrive tranny maintains total streetability with nearly limitless potential for torque. Robert built the tranny himself as well as fabricating all of the necessary adaptation-he was one of the first to transplant a 4L80E into a SyTy. A similar endeavor was undertaken with the rear end, as a Moser 12-bolt was retrofitted to the Sy's chassis packed with 35-spline axles, 3.42 gear and a posi. A Dynotech Engineering HD front prop shaft and custom carbon-fiber 3.5-inch rear driveshaft should be capable of containing over 1,000 horsepower and high rpm blasts down the 1320. The suspension setup is a bit non-conventional by SyTy standards in using AFCO double adjustable coilovers front and rear. The coilover suspension in the rear negates the factory leaf spring setup and uses ladder bars to compensate. In combination with the English-made 16-inch Team Dynamics Pro Race and 15-inch Mickey Thompson lightweight racing wheels, as well as the Wilwood brakes and Momo racing seat, there should be significant weight reduction despite a Swedish-spec chrome-moly roll cage. Unfortunately, Robert has not been able to weigh the truck to confirm this. But one thing is for sure: this setup definitely hooks. With Mickey Thompson 26x10.5 ET Drag slicks at all four corners, the Swedish Sy cuts a 1.38 sixty foot.

Nitrous, good track prep, and favorable DA could all put a serious dent in short times as well as ET-something Robert hoped to achieve when visiting the States last year for the SyTy Nationals. It just wasn't in the cards, though, and a few tuning issues kept him from setting any new records. But this didn't take anything away from the enormous pride Robert takes in his truck, and in himself for building it. Who can blame him?




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