S10xGN

iTrader: (11)

Are the '99 Camaro stock injectors (gray body) worth keeping? What do they flow and if I run an adjustable regulator and jack up the rail pressure, what HP will they support?

bww3588

iTrader: (49)

Increasing rail pressure on stock injectors is only good if your injectors aren't maxed out. Stock 99 injectors are 26lb/hr @ 58 psi. They will support about 400 at the wheels before duty cycle exceeds 85%.

Depending on your setup, I would look into larger injectors.

mezzyshreder

I increased the injector size once I began pushing over 400 hp to the crank. Made a difference

trans_am7935

iTrader: (15)

i have seen guys have problems with cam only cars making 400whp with stock injectors, but have seen others do fine. it is better to change them, as a lean motor is an exploded motor

bww3588

iTrader: (49)

Lean is mean...

On a serious note, always best to err on the side of caution and upgrade them.

S10xGN

iTrader: (11)

OK, looks like some 42.5's are on the list...

MikeWS6

I am still running the stock injectors. My car put down 370 on a mustang dyno so that might be close to 400 on a dyno jet. I havent had any problems but I am considering changing them.