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Message: [QUOTE="superpsd, post: 1034702, member: 15821"] I consulted with Crazy Carl a guy who builds and sells Whipple kits for the Cummins crowd. He has built setups both ways and has found that the blower over the turbo is the most effecient way to go. He did say a bypass is necesarry to let the turbo take over when the suction over comes the flow from the blower. In these setups they are seeing increased response, less smoke, lower egts, elimination on lag between shifts on a manual trans equipped truck, and quicker cool off shutdown times. I drove my rig to work and back last night and even with a low boost you can already feel the difference normal average acceleration from 1000-1500 is smoother that I have ever felt it on the stock tune. I ordered an 2.5" pulley this morning. I will see soon how well it improves the speed. It should be the ticket. My current setup drives the blower at 2.25:1 the 2.5" will spin the blower at an ratio of 2.7:1. Current blower speed @ 650rpms is 1462.5 rpms and will jump to 1,755 rpms. Rpms @ 2000 is currently 4500 and will jump to 5400. At 3500 rpms the blower will be @ a maximum speed of 9450. The Eaton is big enough but a whipple is a far more effecient blower that will be more versatile. I am limited to a 2.5" pulley on the Eaton without expensive machining of the snout to accept a smaller pulley. I would have to build a dual piggy back pulley drive to gain more blower speed. A whipple will flow more air at a lower speed lowering intake temps and overall efficiency. Not to mention a smaller pulley can be more prone to belt slippage at higher loads. [/QUOTE]

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