double you tee eff? maxing out injectors?

[shenanigans]

anything above 80% duty cycle is maxing out injectors... correct...


how come I am seeing 90% at upper rpms... stock fuel, jacked up timing?

other then that tune is pretty damn stock minus some little things?


also off hand what size injectors do we have and what is stock fuel pressure?

[98Camaro3.8]

Originally posted by shenanigans:
also off hand what size injectors do we have

Talk about a can of worms.
http://www.camarov6.com/ubb/ultimate...;f=16;t=003498

Originally posted by shenanigans:
and what is stock fuel pressure?

Fuel pressure with the engine off is 48-55 psi. With the engine running it should be 3-10 psi lower.

[foff667]

eric considering the stock tune tries to get your a/f at like 11.0:1 or something rediculous what do you expect/

[ November 16, 2005, 02:05 PM: Message edited by: foff667 ]

[shenanigans]

just another thought...

t-punks car was hitting 85-89% duty cycle...(z28 takeoff exhaust, air silencer delete) 100% factory tune.

Last night I was hitting 96% on the factory tune except for speedo recal. (cutout on shaved lid, air silencer delete)


Why would the factory prettu much have our injectors max out from the factory?

[South Tampa V6]

Yep, was shocked to be at 94-102% with minimal bolt ons and 13+ AFR. The cam definitely needs new injectors. GM is gay.

[foff667]

Originally posted by shenanigans:
just another thought...

t-punks car was hitting 85-89% duty cycle...(z28 takeoff exhaust, air silencer delete) 100% factory tune.

Last night I was hitting 96% on the factory tune except for speedo recal. (cutout on shaved lid, air silencer delete)


Why would the factory prettu much have our injectors max out from the factory?

I'll go slower this time for you because its obviously not sinking in...the stock tune for say a 98 car commands a base afr of 12.8:1 at normal operating temp + all the adders

now there are no tps % adders only rpm vs time adders

I'll give you a couple of rows
the 0-21 second rows all look like this

0.00000 0rpm
0.00000 800rpm
0.00000 1600rpm
0.00000 2400rpm
-0.54980 3200rpm
-0.79980 4000rpm
-1.00000 4800rpm
-1.40039 5600rpm
-4.59961 6400rpm

now simple math shows that at 5600 your commanded af is 12.8+(-1.40039)=11.4:1 commanded a/f ratio...anywhere between 5600 and 6400rpms it blends that -1.4 and -4.6... -4.6 that means at 6400 rpms your COMMANDED A/f would be 12.8+(-4.59961)=8.2:1 Hello mcfly...gee I wonder why my injectors are maxing out on the stock fueling??? drrr and this is all before the COT fueling thats added in on top of all that, you figure it out from there.