Inliners International Forums General Discussion Hi Performance Dyno day for a 250

Tom,

Re TBI

For a dyno pull the only real tuning required is idle, off idle tranisiton to WOT and WOT. The mid-range normally used for driving is not seen during a pull except for the off idle trasistion.

If the AFR from previous pulls on a carb were entered into the AFR target table and a wideband O2 sensor used to gather actual AFR data by logging the pull with the MS tuning interface you would only need 2-3 pulls to have a fully tuned system.

The tuning process involves data logging a pull, then use the fuel curve optimization s/w. Once the optimization application on the laptop is running then the datalog, and tuneup file for the logged run are opened. The tuneup file contains the fuel table, AFR target table and spark table.
Once opened the optimization anaylsis is run which will adjust the fuel table rich or lean based on the AFR target table and the datalog. The resulting fuel table is then loaded into the EFI controller and a confirmation dyno pull made with logging enabled.

Repeat the above process once and you have a fully tuned system. This whole process would take no more than 15 min's including the 2 dyno pulls.

Idle and off idle tuning does not have to be precise and can be done in 2-3 min's. If the AFR is a bit off at idle/off idle it doesn't matter.

As for the fuel system I think Beater has the complete tank/pump/lines ready to roll.

If it wasn't so difficult to get there from here I'd come down to handle the tuning.