DeMan Motorsport Tuned Cayman May Be The Perfect Sports Car
A Crazy Shop Building A 560-HP 4.5-Liter Cayman GT4
Cayman GT4.5 by DeMan Motorsport
These videos are timely considering none of us has any hope of getting an allocation on a 718 Cayman GT4 RS. In the first review, Matt Farah focuses on the Porsche Cayman Complex a.k.a. how the rear-engine 911 must always be better than the mid-engine 718 — at least from the factory. But when you have Porsche tuners like DeMan Motorsport develop a 4.5L crate engine to give the Cayman the power it truly deserves, well… find out why Matt calls it “bananas” on this episode of MODIFIED. There are several other videos below that really capture just how special this upgrade is.
The 4.5-liter engine upgrade package started out as a passion project for DeMan, seeking to bring his personal GT4’s engine up to match the sublime chassis, and his customers quickly took interest. It started out with a displacement bump to 4.0 liters, with the package growing to 4.25 liters, and eventually, 4.5 liters.
The engine is the result of some skillful old-school hot-rodding techniques and years of development. DeMan takes the original 3.8-liter engine from the car being upgraded, and sends it to a machinist to increase bore from 102 mm to 108 mm. Mahle racing pistons, Carrillo connecting rods, and a crankshaft from the 991-generation 911’s flat-six are added to increase stroke. Those are just the basics. There are lots of other changes DeMan declined to share, in the interest of keeping his discoveries secret from competitors.
DeMan Motorsport has developed an exclusive gear setup where the Main shafts and ratios PERFECTLY match to their large displacement high HP and TQ engines for a gearbox that will rival the PDK for close gear spacing and linear acceleration! Essentially, it gives you a Cayman GT4 with shorter gear ratios which is what it desperately needed. More power, shorter gear ratio and lots of other goodies. Where do I sign up? DeMan continues to develop the GT4 package and you can learn about it a bit more here.