Re: CS injector?

[ptimmerm@mashtun.jpl.nasa.gov]

>>   what the stock CS injector is rated for flow? Are there other Bosch
>>   peak-and-hold injectors of the same physical dimensions that could mount
>>   in the stock location but support higher flow rates? I'm really dreaming
>>   now, how about part numbers?

>	From what I have heard, the stock CIS system is capable of ALOT 
>of HP.  No need to change injectors unless you are making 500HP.  In that 
>case, you should change over to a programmable EFI system anyway.

The stock injector may be capable of alot of HP, but the stock
fuel regulator starts to lean out at about 275 hp. (per ned) The later
model fuel regulators are capable of more, but not 500 hp.

I don't know much about the callaway system, but in general add-ons
give uneven fuel enrichment.  The use of the cold start injector is
popular but problematic.  You don't want different fuel ratios in
different cylinders.

I thought the rising rate fuel regulator was the way to go, and Probst
is my source for that info.  Ned didn't think so.  The mechanical fuel
injectors rate of delivery if proportional to pressure, and having
higher pressure gives higer flow.  Ned's point was that the control
are for the air mass sensor was fully deployed at about 275 hp, and
above that no more fuel was coming out, thus leaning out.  We know
what happens then (reference two blown Q's at Brainerd). With higher
pressure, the leaning out would be forstalled.  Since the pressure
increases with boost, it acts in addition to the air mass sensor.

The best of both worlds is probably both the bigger fuel regulator AND
the boost sensative / rising rate fuel pressure regulator. maybe :-}

paul timmerman