[Richard L]

Does the 87 Ruf uses low impedance injectors from factory?

The H6 (discontinued 3-4 years ago) was not strictly designed to run all types of low impedance injectors due to different "peak and hold" technique used by different companies. You have a better chance of success if you go for the newer HFS-4.

Spoke to Jeff, he did recommend the HFS-4 so for some reason you have decided to purchase a second hand HFS-6 (NIB). If you had told Jeff at the time of enquiry that you are running a Motec and low impedance injectors, he wouldn't gave you a lead for a S/H HFS-6.


Suggestions:

1. The best way to get around this is by driving the H6 directly from a separate PWM output off the motec.
2. Use resistor pack (6-8 ohms).
3. Run the system via manifold pressure sensor instead of IDC.