Re: Install HFS-3 on DI engines - any need to connect MAP sensor?
If you connect the MPS on the H3, you are opening up new grounds, see below.
The HFS-3 can use 70% IDC and 30% MPS (manifold pressure sensor) for controlling flow. Factory default is 100% IDC control. To activate the 30%, you need to cut solder link on the underside of the circuit board.
Choice of trigger (IDC or MPS) remains functional and independent of the above options.
What make and model is the new DI car?
There are a few differences on the HFS-4:
1. MPS can be 1 bar (absolute), 2.5 or 3.5 bar. H3 is 0-5V absolute.
2. H4 has infinite ratio between IDC and MPS, 100/0 <-> 50/50 <-> 0/100%.
3. H4 also read the HPFP (high pressure fuel pump to compensate DI's fuel line pressure.
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Richard L
aquamist technical support
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