peak-n-holds

[rr]

No, just changing the drivers won't make any difference. Both
a P-n-H and Sat driver apply the full voltage across the
injector at the start. 

It's only after the current reaches 4A (P-n-H driver), does
the driver chip make a change in it's operation. That is, back
off the current to a 1A level (hold).

The saturated injector current won't even reach 1A, so even
if the time-out circuit is used in the P-n-H driver, it won't
make a difference. (This would be relative to a single injector
per driver, such as a sequential system).

-All of the above is relative to GM system's-

BobR.

For static testing of P-n-H injectors, use a 10-Ohm/10W resister
in series with the injector and a 12 to 14 V P/S. It will open,
and the current is limited, so no smoke. Can get them at the
local RatShack.

Mike Pitts wrote:
> 
> Has anyone ever taken fuel delivery measurement differences
> between peak-n-hold and saturated drivers, for the same
> injector at the same PW and fuel pressure?
> 
> My thinking is that the P-n-H drivers may open the injector
> a little quicker, therefore delivering slightly more fuel
> for a given PW.
> 
> Just want to know ahead of time if the fueling is gonna
> change when I upgrade my ECM.
> 
> Thanks,
> -Mike