Dodge Ram Cummins Triple Turbo Daily Driver
Three Of A Kind Beats Two Pair Every Time
Triple-turbo setups seem to be all the rage these days. We started seeing them in high-level sled pulling applications but are now seeing them on daily driven street trucks. And why not? Three agents of forced induction can provide instant spool-up, low exhaust gas temperature, and make more power at lower boost levels than twins. And, of course, who can argue that three turbos aren't better than two?
Due to the inline Cummins architecture, the passenger side of a Dodge Ram's engine compartment can easily house a set of triplets-which is exactly what David Hall of Bullseye Power did with his 5.9L common-rail. Based on Schwitzer S300s, the first stage of compression begins with the top two chargers, which are CompR 62-71 units with 1.00 A/R turbine housings. The bottom turbo is a CompR 64-71 model with a 0.91 A/R turbine housing and uses a divided T4 mounting flange. Nearly everything under the hood is stainless steel, including the cast second-generation exhaust manifold.
A set of 5x0.0105 injectors and a Level 3 CP3 from Wicked Diesel, in conjunction with Smarty tuning, provides 743 hp and 1,312 lb-ft of torque-and the small, triple setup spools instantly. To hold up to the boost created by the triples, the stock cylinder head was fire-ringed, stiffer valvesprings from Hamilton Cams were added, and second-generation Cummins connecting rods were fitted. A set of H-11 head studs from Haisley Machine holds down the fort and keeps the head mated to the block.
Because it's still in testing, there are no wastegates on the system to control drive pressure (yet). However, the folks at Bullseye Power told us that under half-throttle, 60 to 70 psi of boost can be observed. It also stated that if boost couldn't be kept to less than 100 psi, at least one external wastegate would be added to the bottom charger, or the turbine wheel diameter on the bottom unit would be increased. Under a considerable load, we're told that the truck's EGT has never exceeded 1,400 degrees. This summer, some heavy fifth-wheel tow testing will be in store for Hall's test mule as well. After that, look for Bullseye Power to offer a variation of this system to the public.
BullseyeMuskegon, MI 49442