Hi, Iam using twm itbs with hondata s300 and I need some help to calibrate them. I check the tps with a multimeter and the specs are very close to factory .5 close 4.5 open, but in hondata when the itbs are close say almost 90% and wide open over 130%. The car was tune using map, but I think I can see better performance using aplha n (TPS).

 

1. Check your wiring.
2. Make sure the tps is sending .45 volts to the signal wire at the ecu when the throttle bodys are closed and 4.5 when open.
3. Make sure your properly calibrating the tps via the parameters in the s300 software.

 

Thanks very much, do you think I will see better performance results tuning via TPS vs MAP?

 

It all boils down to how much vacuum you have.

If you choose to stick with a map based tune, you'll have to focus on a few areas of the map you typically wouldn't have to worry about. As soon as you crack the throttles, you lose almost all manifold vacuum and your noid will shoot straight to the bottom left corner of the map (in s300) so this area becomes critical. In a single throttle body situation, where you don't have as much response, you'd probably never hit this area because rpm increases before you lose all vacuum.

Alpha-n makes this transition much more gradual on the map, but you still have to fuel for the amount of air coming in, meaning your first few rows will be pretty steep.