Yes for ITB TPS base tuning is better due to the lack of stable vacuum for ITBs. The plenum is too small to provide a smooth signal. Some have made it work but speed density(MAP) based tuning is better if you have a single throttle valve and a plenum. A very good tuner can blend the two and utilize both TPS and MAP. My tuner recommended using the MAP sensor on my ITBs and he has been able to successfully tune ITBs on GTRs and other ITB engines. Hoping to finish mine by the end of the year so I’ll update on my setup. Haltech R3, Clewett ITBs, full built 2.7 with forged internals. Hopefully it does well.
