PE table and IFR question
06-28-2004, 12:21 PM
#2
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IFR is a fundamental cal table telling the PCM how
much fuel will be delivered. It affects everything
everywhere.
PE is an adjustment table telling the PCM what AFR
to shoot for, at higher MAP / higher throttle. The IFR
based fuel delivery info will be used in calculating the
right shot pulse width to hit that value.
much fuel will be delivered. It affects everything
everywhere.
PE is an adjustment table telling the PCM what AFR
to shoot for, at higher MAP / higher throttle. The IFR
based fuel delivery info will be used in calculating the
right shot pulse width to hit that value.
06-28-2004, 12:41 PM
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tune
Originally Posted by jimmyblue
IFR is a fundamental cal table telling the PCM how
much fuel will be delivered. It affects everything
everywhere.
PE is an adjustment table telling the PCM what AFR
to shoot for, at higher MAP / higher throttle. The IFR
based fuel delivery info will be used in calculating the
right shot pulse width to hit that value.
much fuel will be delivered. It affects everything
everywhere.
PE is an adjustment table telling the PCM what AFR
to shoot for, at higher MAP / higher throttle. The IFR
based fuel delivery info will be used in calculating the
right shot pulse width to hit that value.
06-28-2004, 12:42 PM
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Originally Posted by ESR
See basically the problem Im running into is I have a T76 TTI camaro with and it produced 500 rwhp and 550 rwtq on the dyno at 5000 rpms but anything above that the power starts to fall and if your in the car it feels as if the one or two of the plugs are getting the spark blown out. Im trying to figure out if the fuel may be wetting the plugs it ran 11.2 to 1 AFR on a dynojet but wierd that power dropped after 5000 and the cam should be good till like 6000 rpm its a 228/234 569/569 @ 114 I looked on auto tap and cylinder 3 at WOT has like 50 misfires and the rest seem to be within tolerace of a couple every so often say 3 or 4 the cylinder next to three picks up 10 misfires or so but thats probably just picking it up off of the cylinder which has 50. Any thoughts.
oh yeah I have dual rev springs so doubt its a valve float issue.
Eric
06-28-2004, 01:10 PM
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Is the fuel delivery (pump, wiring) up to supplying the
injectors you've got in there? This sounds sort of like
fuel starvation. I presume these are oversize injectors?
You should look at the pulsewidth and duty cycle to see
if you're maxed out, but if you are making changes that
say "throw more fuel" and it just doesn't happen, then
you have to suspect the hardware.
If it's a single cylinder that acts up, you might want to
try stuff like swapping its injector with some other cyl
and see if the problem moves. Same with plugs if you
aren't up for a full set replacement, and coils. Try and
find the misfire source because it's probably pulling
timing on you.
11.2:1 is plenty chubby. Is that what you FI guys have
to run, normally? Or are you just there, trying to cover
up the misfire / knock problem?
injectors you've got in there? This sounds sort of like
fuel starvation. I presume these are oversize injectors?
You should look at the pulsewidth and duty cycle to see
if you're maxed out, but if you are making changes that
say "throw more fuel" and it just doesn't happen, then
you have to suspect the hardware.
If it's a single cylinder that acts up, you might want to
try stuff like swapping its injector with some other cyl
and see if the problem moves. Same with plugs if you
aren't up for a full set replacement, and coils. Try and
find the misfire source because it's probably pulling
timing on you.
11.2:1 is plenty chubby. Is that what you FI guys have
to run, normally? Or are you just there, trying to cover
up the misfire / knock problem?
06-28-2004, 01:19 PM
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tune Well basically 42 pound svo injectors and yeah Im trading a buddy for some 6.0 L coil pack (supposedly a little stronger ) and a dual walboro set up. yeah basically that was the next idea to swap the items on the cyclinder thats acting up but wanted to check tune. So if fuel was not burnt would the o2 s pick that up or do they only read spent gases? yeah probably just that one cyclinder thats holding me down though. Thanks for the insight. reply back if you can think of anything in regards to the tune.
eric
eric
