With the motor fitted up to the Bonneville chassis we were able to start the process of tuning the engine. After a quick startup in the workshop just to make sure that the bike was running smoothly it was time to get it on the Dyno. The before doing that we installed a PowerCommander to allow us to build a new fuel map as the engine will be needing a lot more fuel than the standard bike! The installation of the PowerCommander is very simple, just plug it into the standard loom and its all ready to go.
We were lucky enough to Andrew Hallam of Hallam Racing on hand to help us with the tuning, Halam Racing have done all of the design and development work on the motor and the performance of this engine really is a testament to the quality of their work. The first run on the dyno showed that as we were expecting we needed a lot more fuel, a few quick tweaks and we were quickly getting close to a well balanced map. The objective for the first runs were to check if the standard injectors were going to be big enough and to build a map suitable for running the bike in on the road. We planned to only test the motor up to 75% throttle, after some running in and a check of the motor we will then push it right up to 100% throttle and build a map suited to our Land Speed attempt.
The question everyone is asking is “how much power?”, we have been a little shy in sharing those figures in detail but here is a summary from our first run;
At 75% throttle on 98 octane pump gas we saw almost 88hp at the back wheel. To put this in context a standard Bonneville on the same dyno recorded a figure of 42hp at full throttle (the dyno we are using is a little conservative so all figures should be assessed relative to the performance of the standard bike on the same dyno). To say that we were happy with double the hp of the standard bike at only 75% throttle is an understatement, at 100% throttle it should be developing ~100hp but we are not expecting to stop there. We still have to run the motor in properly, build a new exhaust and swap the standard 98 octane pump gas for something a bit more potent. There is still a lot of development to be done but so far we are off to a promising start.
The next job is to put about 500km on the bike to run the motor in (tough job but someone has to do it!). Following that we will strip the motor, check everything closely and re-assemble prior to final tuning in the Salt Racer chassis.