I'm thinking about trying to use the Under Hood 1227727 ECM for a TBI. I'm thinking of using definition $8D with a resistor network to trick the ECM to thinking the Low Impedance TBI are High Impedance TPI injectors.

I found the information (Formulas) below from a MegaSquirt website.

Injector Resistors
This method has been used by many OEMs as a simple approach to driving low-z injectors. The installer has the option of installing a 5 to 8 ohm resistor (with a 20 to 25 watt rating) in series with each injector (in effect converting them to hi-z.)
1980s Volvos were fitted with a resistor pack that conveniently combines a number of resistors.
To limit the current to under 2 amps, you need:
resistor ohms = (alternator voltage / 2.0 amps) - injector resistance
For example:
resistor ohms = (14.0 volts / 2.0 amps) - 1.2 ohms
=> resistor ohms = 7.0 - 1.2 = 5.8 ohms

The application I am thinking of converting to $8D TBI is a Marine SBC application. Using an under dash ECM is not an OPTION!

Couple things I'm thinking about:
TPI and TBI are different DRP's.
The OEM '7727 TBI definition is not hacked as nicely as the $8D / Super $8D!
Injector flow settings; seems like injector flow of about 15 Lb / Hr would equal one TBI injector of 60 Lb / Hr?

Any thoughts Pro's / Con's are welcome.

dave w