evil5.3

ok if are cars are lean why dont we put a bigger fuel pump and change the injectors tune and call it a day or am i missing something . and what injectors do we have lbs wise .

texasGXP08

I believe these are tuned lean from the factory for emissions and fuel economy reasons (ratings and for competitive data). A dyno tune remedied my problems. I do not know what size injectors our cars have but for anyone near stock a simple tune is more than sufficient.

AlabamaGuy

iTrader: (5)

Our injectors are marginally smaller than LS6 injectors. We have plenty of fuel, they're just tuned lean.

Rossko85

iTrader: (11)

im wanting to say 28-34lbs...its somewhere in that ball park im pretty certain

AlabamaGuy

iTrader: (5)

Yes sir.
28#

LS1 Racing

iTrader: (15)

Quoted for truth. I'm beginning to think our friend evil is looking for the most difficult ways possible to make power.

AlabamaGuy

iTrader: (5)

Sounding like a former DSM owner.

evil 5.3

thanks guys no im not trying to be difficult on making the power i just didnt understand why they tuned the car with knock retard in it . my 05 gtp comp g was my problem maker you did everything possible to get rid of the kr* and i had it late 04 so there was only hp tuners and i was on a limited budget because i was doing a gto build at the same time and well i had extra parts laying around justlike i do now i have a set of 36 pound ls1 injector laying around that y im asking

AlabamaGuy

iTrader: (5)

It's all good, man. Those 36# injectors would be a downgrade for us though. Plus we have different injector harnesses so they wouldn't plug in anyway. If you're wanting to do an intake swap, try to sell them and buy a set of the 28# F-body injectors.

evil 5.3

im going to do an intake swap of some sort i have a couple of intake manifolds i already have an ls1 and a ported ls6 because a friend went to a fast set up so im piecing it together slowly hope to have every thing i need by tax time to get my headders to but like they say their is always more than one way to reach a goal and i do like a road alittle less traveled but thanks for all the info guy really appricate it

06MonteSS

y'all are panicking over nothing really...



they're not THAT lean... and are actually RICH at WOT...

WOT/PE fueling comes into play after 87% throttle (stock), at which point, you're over 5000 rpm... and again at which point, the fueling is actually RICH, not lean....

stock tune - anything less than 87% throttle and 5000 rpm, the ecm considers you to be at "part-throttle" and fuel trims are still in affect, and adjust the fueling...

if you are MORE than 87% throttle and OVER 5000 rpm, you're in WOT/PE mode, and the fueling is richened up, so you are not lean....

all of this of course, is fixed and adjusted appropriately with a custom tune, to change the ranges, throttle %, fueling, etc etc...

in all the tunes I've done for these cars, the only point at which I've seen most have some KR, is about 4200-4800 rpm... but not from being lean, the timing is a little high... I reduce the timing in that area by a couple degrees, and all is well...