Anone have any idea on how to build an impedance converter emulating the "Peak and Hold" logic of an acceleronics converter?

 

Why don't you just buy LJ's kit? Or convert to an aftermarket system.

 

Maybe because it's easy to build, cheap, and you can take pride in doing it your self?

 

This is a start-

http://www.national.com/pf/LM/LM1949.html

 

Sure the parts may be cheap, but what about your time? Not to mention, not everybody knows how to do circuit design so you'll be copying someone else's design. Then all you did was assemble a bunch of components and if/when something goes wrong in the testing phase you won't know where to begin looking unless of course you happen to have an oscilloscope at home.

 

ok from reading the link posted above I understand the basic operation but why would you need one?

 

What about my time? This is simple circuit (8 pin chip with a couple of resistors, couple of capacitors, a zener diode, and a darlington transistor ... Might take an hour to do all 8 injector drivers - my guess the hardest part would be making a pretty housing for it. Just looking at Digikey, I'd say the total for all the parts would be around $70. I think the acceleronics box runs around $400 ... I'm sure some people wouldn't want to mess with building their own box just to save a measly $300+, but I'm not one of them. As for the circuit design, everything is right there on the Nationl specs page for the LM1949, you just need to know how to read a *very* simple schematic.

 

You wouldnt need one, you would need 8.

 

Keep in mind that those chips are $4.23 times 8 for a cost of $34. Then you still need the other components, a custom PCB and an enclosure.

 

Grover, pessimistic aren't we? I have background in wiring and PLC programming, this circuit is so basic its a shame that acceleronics can make so much money off this. The only real pricey part in that system is the darlington resistor and the lm1949, everything else is probably .40 cents a piece (x8).

www.kak.com/camaro/injector.JPG

Unlike many people I take pride in working on my car and my accomplishments, so time and experience I gain isn't being wasted. Imagine going to school and actually being able to apply what you learned to a real life situation for your own personal use, doesn't make it seem like such a waste does it? I am 19 years old and going to have a 1000+rwhp car funded completely by myself, which would not have been possible if I didn't try and save a few bucks doing things myself.

 

I wasn't trying to be pessimistic Pat. I didn't know what your background was, nor did I know that the circuit was so readily available that's why I mentioned buying LJ's tried and trued unit. I also know what your plans are for that car and was wondering why you would try and reach that goal with the very limited factory PCM, that's why I said convert to an aftermarket unit because it will make the programming MUCH easier especially dealing with the amount of boost you're going to need.

And PLC programming is much different from circuit design, I have been doing it for 10+ years.

 

I have dfi gen 7 and i know they are different, this is for a different setup

 

O.K. so why would you need 8? is this to drive a second set of injectors or just huge ones with the stock computer?

 

All 8 injectors aren't running at the same time are they? The PCM has 8 different channels.

 

sounds great pat! hows it all coming!