Well, the 750cc injectors we ordered from
RnR Racing finally arrived. What we
actually received were a set of very poorly packaged PTE/Delphi 780cc
injectors. (Which are really just machined versions of GM Rochester
injectors, and which flow-test at about 748cc/min; how's that for a
mouthful?) RnR listed the injectors at a sale price of $300, so we figured
it was a good deal. Not really; they weren't in stock (why would you put an
item you don't have in stock on sale?), and we ended up waiting three weeks
for them. When we said "cancel the order", Ryan at RnR emailed us a tracking
number instead, insisting that the injectors went out that morning. Three
days later, UPS picked the box up from RnR. *sigh* I can't say enough bad
things about this; he lied when we asked for a ship date (twice), and then
he lied about having actually shipped it (and bought a shipping label for
a package he didn't even have available for sending to us!). This is shady
business, and I'll have no part in it again. The sad thing is, I defended
his long lead times on his exhausts (I bought his downpipe for the Eclipse),
mainly because of the fine craftsmanship of the unit I received. That's it;
no more business with this guy.
Anyway, to the injectors: after a little searching around the
dsm-ecu mailing list and
DSMLink forums, I came up with a
deadtime adjustment of about 315us. So, we flashed a new chip for the Laser
accounting for a 750cc flow rate, and 315us of deadtime, and made a couple
of additional changes: octane reset (every time the car starts, the ECU
now resets it's rough idea of the "octane" of the fuel we're running), and
kpt4321's
modified fuel and timing maps. Installed the injectors, popped in the
chip, and the car idled like stock. You'd never know we put bigger injectors
in there. Took it out for a quick trial run, and hit 63.7% duty cycle at 7500
RPM where previously we'd be topping out at 103% at 6000 RPM. Niiiiice.
Downside: we have a leaking upper o-ring on the #3 injector. *sigh* No upgrade
ever goes perfectly, does it? So, we'll have to pull the fuel rail again
tonight, check to see if the ring is just seated poorly, or replace it if
necessary with one from the stock 450s. But overall, I'm pretty happy with the
results; next stop: rewiring the fuel pump to make sure the fuel flow we need
is there.