Which computer? Just look up the MOTEC site, there is a many variants there. As for development time, it dependents on if working on it full time or a hobby like Wayne1992. Typically, if there is a product already on the market, it is cheaper (time / money) wise to buy it. Unless a) you doing it as a hobby, got time to kill.
b) there is a deficiency in the curreny product and improvement can be made.

Throw out what you want in your dream ECU/monitoring unit (this goes for everyone not just HDDP).
We can evaluate the specs and go from there.

But be warned, if this goes on as an opensource / hobby, you might not get anything back before your car hits 200k miles.

chung


Unless your proposition includes funding.