Turbobike Web Site www.Turborick.com
The reason the fuynnybikes wing their engines is that the turbos are huge units (really almost over-sized for the application and unusable on the street) and they want boost immediately off the line. The only way to build boost on the line is to spin the turbine by increasing the mass airflow past the turbine. Simply holding the revs up won't do it since the throttle body or carb is almost closed and flows little air. So you have to either get wildly on and off full throttle or go on the 2-step. A healthy nitrous dump off the line also brings the boost up. Once you're up, however, then you're running 40-50 psi boost and 500+ horsepower, depending on your combination. Your Aerocharger is a very small turbo compared to your friends draw through (probably an FF40 Rayjay). His turbo will ultimately make more power, but yours is more user friendly on a street machine. The Rayjay is also a very old, high inertia design which doesn't help. The normal thing to do on the old Rayjays is build as much displacement into the engine as possible to make a better match to the turbo. My old FJ wouldn't build any appreciable boost until 6000 rpm with the stock 1098 motor, and then it was like being kicked by a mule. By bumping it to 1314cc it built boost at 4000 rpm and only brought peak power down from 10,300 to 10,000 rpm. It filled in the midrange like you wouldn't believe and made it much more fun to ride. L8R ABNZX9@aol.com on 11/23/99 04:28:06 AM To: turbobike@natvideo.com cc: (bcc: Bob Shammas/EQA/Nsk-Corp) Fax to: Subject: Re: [turbobike] Carb Question In a message dated 11/22/99 4:21:19 PM US Eastern Standard Time, shammar@nsk-corp.com writes: << I believe that the amount of time it will take to fill the plenum will be insignificant. >> Could this be why some turbo dragbikes rev the bike repeatedly at the line? That is one thing I really like about my Aerodyne compared to a friends draw thru turboed GSXR my bike has no turbo lag whatsover.