Peak and hold conversion (crossposted)

[the Fredericks]

The data sheets for the P&H drivers from Cherry Semiconductor are on the
web.  I have a  converted 192 ECM that was done on the board.  Basically,
the 5 pin P&H drivers are the same TO-220 case size as the transistor they
replace; you bend two legs up and put the new zeners and dropping resistors
flat on the board; solder them to their respective pins on the drivers.
Then pot the whole mess in place.  It's kind of ugly but fits into the ECM
case fine.

A stand-alone P&H adapter that would also allow duty cycle tuning  for each
cylinder is a project I hope to build someday.   I  know Accel makes one but
it's for batch fire ECMs only.

Kendall Frederick

> -----Original Message-----
> From: owner-gmecm at esl.eng.ohio-state.edu
> [mailto:owner-gmecm at esl.eng.ohio-state.edu]On Behalf Of CSH-HQ
> Sent: Thursday, August 26, 1999 6:59 PM
> To: gmecm at efi332.eng.ohio-state.edu
> Subject: Re: Peak and hold conversion (crossposted)
>
>
> Mike Pitts, did a tab by tab what too do posting, maybe at gmecm.
> Bruce
>
>
> >I spent some time reading through the 332 and DIY archives today looking
> >for anyone that has converted to P-H drivers.  Obviously it would be
> >nice to integrate the conversion right into the existing board, but that
> >looks impossible now that I see the driver ICs.  Actually having an
> >interface box might be useful so that others could use it for their high
> >performance LTx engines without having to hack the PCM extensively.
> >
> >Since I have no EE background, I am a little crippled with respect to
> >some of the discussion, but did see something interesting.  Someone
> >mentioned building a P-H drivers and putting them inline with the
> >injectors to adapt P-H to a non P-H controller.  Is anyone doing this or
> >is it just 'one of those ideas' that sounded good, but not really
> >worthwhile.  I would really like to get started on figuring out how to
> >run the P-H injectors with my P6 PCM, but am not sure where to start.
> >--
> >Scott Knight  mailto:sknight at mich.com
> >http://www.mich.com/~sknight IRC:SS396man
> >'95 Black Impala SS
> >'94 Ducati 900SS CR
> >
>