TPS/AFM?

[cvrle]

I read a lot of it on forum , but I dont uderstand one thing.

What TPS work and what is his role in conjuction with AFM?

I now that AFM make ratio with air and fuel but what TPS work. Does eny chance that TPS just there for ignition timing?

My question is what will hapend if I put dellorto carburetor with modified TPS sensor on it and run with stock ECU. Does I will have same ignition timing like with AFM or the timing will be locked ?

[jondee86]

AFM contains a potentiometer to signal engine load (=airflow) to the ECU.
It also contains a switch to turn the fuel pump on, the idle air control and
(sometimes) the entering air temperature sensor.

TPS contains a potentiometer to signal throttle position, and contacts for
throttle closed (= idle) and throttle >70 deg open (= WOT or open loop).

The ECU uses the signals from both the AFM and the TPS to calculate
the mixture and ignition timing, accelerator pump function, fuel cut on
overrun, off-idle enrichment, hot and cold idle settings etc.

I believe it is possible to use the ECU to control ignition timing only, but
you will need to ask one of the Megasquirt gurus how this is done. The
other alternative is to use a distributor with built-in electronic advance,
such as is found on one of the K-Series (4K ?) engines.

Cheers... jondee86

[cvrle]

Thanks, I just be confused with that thing, how it works, and mybee someone skip some other solution.

I think that must be done only on two way's, with MSD ignition or similiar, or with 4K distributor, as already talk here on forum.