In the past I've used a Matco digital multimeter at the dyno... it had %
duty cycle built into the meter... I picked one up at Sears that has that
function, but have yet to use it. Duty cycle would only be of concern
(IMO) at WOT, due to the fact that after 'x' % cycle, the pintle would be
unable to complete it's full open/close cycle, thus hanging up.
On 2001.04.13 21:35 TommFern@aol.com wrote:
> I've read in the past that Jon and some of you others have found out
> what %
> duty cylce your inj are running at. 1) How was this done? 2) Is this only
>
> manipulated at part throttle conditions or also at WOT? I assumed that at
> WOT
> the PCM only used the fuel maps and the IAT. If this is the case, I would
>
> assume chrysler would have engineered the pulse width NOT to be maxed out
> at
> WOT. My reason for asking this is because I have a theory as to why I
> need a
> larger fuel inj. than would normally be required for a mass-air car. I'm
> thinking that if the PCM cannot max out the pulse width at WOT I've read
> in
> the past that Jon and some of you others have found out what % duty cylce
>
> your inj are running at. 1) How was this done? 2) Is this only
> manipulated at
> part throttle conditions or also at WOT? I assumed that at WOT the PCM
> only
> used the fuel maps and the IAT. If this is the case, I would assume
> chrysler
> would have engineered the pulse width NOT to be maxed out at WOT. My
> reason
> for asking this is because I have a theory as to why I need a larger fuel
>
> inj. than would normally be required for a mass-air car. I'm thinking
> that
> because the PCM cannot max out the pulse width at WOT, a larger than
> normal
> inj is required to supply the fuel for such a short pusle width.
> My 30lbs are set at 62psi, and it is still lean! This should not be
> needed
> for a NA 360 with the power I'm making unless of course I'm right. I now
> plan
> to go up to a 36lber. Any comments?
> Tom
>
>
-- _______________ Jon Smith Raleigh, NC www.fast4x4.net '94 CC 4x4 318 344rwhp/424rwtq ~~~~~~~~~~~~~~~
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 12:01:02 EDT