V3 injector curent limit?

arlo#1 · Post by **arlo#1** » Thu Mar 29, 2007 8:53 pm

I need to know what the limit for the ms2 v3 bord is per injector driver. I am going to be running 16 injectors 8 per side I belive they are 12ohm injectors but I need to know if I need to use pwm or a set of resitors. I realy just need to know what the max curent the ms2 v3 can flow is then I can do all the math my self thank you.

arlo#1 · Post by **arlo#1** » Sat Mar 31, 2007 8:48 pm

Thanks for the reply Jim, but I am after one spesific answer that being the amount of current (amp's) I am able to run off of each bank eg pin # 32&33 together like you would normaly do it and pin 34&35 together.

Mike_Robert · Post by **Mike_Robert** » Sun Apr 01, 2007 5:13 am

This link http://www.irf.com/product-info/datashe ... fiz34n.pdf will display the spec sheet for the injector drivers. Even though we use these drivers in a pulsed mode, high duty cycle operation more closely resembles a continuous drain mode, I would think. For reliability I would use the 100oC rating of 15 amps as an absolute max and would still not be terribly comfortable running things on the ragged edge. Of course, you could run it on the bench for a while in worst case scenario and see how hot they actually get - real world observation trumps theoretical predictions every time.

-Mike

renns · Post by **renns** » Sun Apr 01, 2007 5:25 am

The weak link in the MS is probably the DB-style connector, which is typically rated at 5A per pin. For the injector outputs, that's 10A limit per bank. If you run 8 injectors per bank, then you'll be right at that limit at high duty cycles. So long as those high duty cycles are intermittent, you should be fine.

Roger.