Relay Help. 12V supply but only 7v out..I don't get it

[truegearhead]

Let me preface this question with the fact that this car has 0 factory electronics or anything else for that matter. So this is more of a basic electrical question than a Boxster question.

I am trying to start my audi V8 swap and have spark but I only have 7V at the injectors which is preventing them from operating. I've traced the power back to the relay that is powering them and I am seeing 7V out of the relay as well. Oddly, both the signal and power coming into the relay are 12V and the ground is ohm'ing out at 0 ohms (the ground is good). I moved it just to be sure. I thought the relay was bad so I swapped it out and have the same result...12V in and 7V out... Any ideas on what witchcraft is at play here?