On a MAF system, if you UP the fuel
pressure 7 - 10 %, and set the flow rate to a value 7 - 10%
higher, the 305 injectors will have the best chance on a
un-hotrodded 350 motor IMO. you can add 20% more FP and
mess up idle and cause BLM skewing, and the WOT will have more
fuel, or you can leave the FP alone and idle will be great but
WOT may have the injectors static and still have low o2
readings. Either is a comprimise. 305 to 350 = bit
more than 14% more air, need 14% more fuel and thats with no
other intake mods. If you were using 12ms at WOT on the 305
you'll use the same injectors 14% longer in the 350 - closer to
static (or over)
dont just change the BPW by 14%,
(in a MAF) you'll do the opposite of what you are after. the
injector base PW should be the actual setting for the injectors
used - then you adjust it a bit for more FP.. which makes the
injectors have a higher flow rate than they are
"stamped". a better spray pattern too. On a TPI
(not TBI) each of the 8 are rated at 19#/hr for a 305 and 22#/hr
for a 350. 19 * 1.14 = 21.66 amazingly... keeps the injectors
below something like 80% of max duty cycle.
and you're "off road" so
no problem with the feds.
Please anyone correct anything. I'm
not a pro, I just play one on TV.
PS - my soon to be dropped-in 383
will start out with 350 injectors. (MAF too).
----- Original Message -----
Sent: Tuesday, February
22, 2000 4:46 PM
Subject: BPW
numbers
Greetings guys,
Just wondering what BPW
numbers would do when a guy changes a 305 to a 350. The 1988
TBI injectors are different, PROM BPW numbers are 148 for a
305 and 135 for a 350.
This is based on flow in grams/sec...what would you have to
set a 305 injector to, to work in a 350 properly -- or is
the flow rate too low already ?
Lyndon.