DIYEFI.org Forum

I was simply using it to justify and explain my reasoning with respect to which configurations match with which RPM expectations etc. The final result is "up to 270 injections per second" is a reasonable expectation. You should run your math there IMO.

I just added a note about 257 injections per second, which turns out to be a bit over 5 watts per channel with 40V OVP's.

one question does it has to be a vnp mosfet? I know the work well but the are hard to get locally where I live. In ms I used irfz44 and they made the job any reason I can not use this one for my freeEfi proyect?

No, not at all. You need to protect the FET from input, ouput voltage conditions, over current, over temperature etc yourself if you don't use them, and if choose one that is not logic level then you need an additional FET driver to go with it. The beauty of the autofets is that they do all of that in the one package (well, some of them do all of it) thus saving space and/or increasing reliability in the same space.

I hope that helps, welcome along! :-)

Fred.

got it I understand your all of your points. Just a side note the Irfz44 is a logic level fet and the break down voltage is quite hi I don't remember well but is something like 24 to 30 A it worked as a direct substitute in my last ms project. Then again for the new project I will stick with you guys and your advice.

Btw I know is not possible yet but the project is a K20A2 RSX Type S. I know I will lose a lot of features with the initial set up but I have faith in the end is going to be worth it.

Thanks for the vote of confidence! Re your engine, I started a thread, let me know what you know. Maybe it is possible, after all ;-)