IRF640N as INJFET anyone?

[PeepPaadam]

Here in Wiki someone claims to use those with great success but there's no details how to exactly use them. Here's the link: http://www.vems.hu/wiki/index.php?page=MembersPage%2FGergelyLezsak%2FFlyBack

Do you have to have power-flyback/30V transinet diode etc still in place or not?

IRF640N's are cheap and they would be very easy to use.

[MWfire]

I did 6cars with irf640n without any problem.
I allway use flyback.

[GintsK]

Low-Z also?
What voltage flyback?

[MWfire]

Low-Z also?
What voltage flyback?

yes, two cars with lpg(0.9ohm, 4A for open, 1A for staying open). 0.4V when pwm is activate, 30V when injector must close.

[PeepPaadam]

Could you be more specific? Do you use just the 30v diode on the flyback lead and no add-on board power-flyback with Low-Z?

[MWfire]

It's active flyback

http://www.vems.hu/wiki/index.php?page=MembersPage%2FDamirMuha%2FLowZinjectorsFlyback
http://www.vems.hu/wiki/index.php?page=MembersPage%2FGoranJurkovic%2FDaewooLaNOS%2FLPG