bigger injectors stock tuning

[ForceFedV6]

anyone know if I can install a set of 42# fuel injectors on my 3.4L with stock tuning? would i run the risk of damaging my motor or would it even run at all?

[Smoke Panther]

Re: bigger injectors stock tuning

you'll be running unbelievably rich

[3.4grapeofwrath]

Re: bigger injectors stock tuning

Don't even try. I ran 24lber's on my 3.4 and it ran really rich especially during start up at open loop mode. How many lbs of boost are you running?

[firebirddrvr]

Re: bigger injectors stock tuning

might not even start

[ForceFedV6]

Re: bigger injectors stock tuning

i'm running 6psi of boost for now. Do you guys recommend an adjustable regulator, the speed shop where i'm getting it tuned said that they don't think it will be necessary. i've got a higher flow fuel pump, but it's being held back by the stock regulator.

[3.4grapeofwrath]

Re: bigger injectors stock tuning

i'm running 6psi of boost for now. Do you guys recommend an adjustable regulator, the speed shop where i'm getting it tuned said that they don't think it will be necessary. i've got a higher flow fuel pump, but it's being held back by the stock regulator.

I would recommend getting an FMU. Your stock regulator won't hold back the fuel pump because it is only adding more fuel volume.
What kind of tuning is your speed shop doing?

[ForceFedV6]

Re: bigger injectors stock tuning

yeah, i've got an fmu installed. as for the tuning, they just looked at my ecu's numbers purchased a certain cable and told me to bring it in when i get the chance. so i'm guessing just a basic computer tune.

[97rs4life]

Re: bigger injectors stock tuning

yea sounds like the shop you are using has no clue about the 3.4 engine if they think they can just buy a cable.

Use the FMU for upping the fuel with the walbro pump

[ForceFedV6]

Re: bigger injectors stock tuning

they said they've got the software...so far, i'm pleased with their knowledge and skills, i've spent quite a few hours checking out their work, i just hope they don't make me put my foot in my mouth

[97rs4life]

Re: bigger injectors stock tuning

do they realize that it is different than a lt1 pcm?

[ForceFedV6]

Re: bigger injectors stock tuning

I hope they do, when i first went to their shop, they kept on calling it a z28 until they finally saw that the intake manifold said 3.4 on it...these guys originally started their shop with american vehicles, but i'm still concerned about how mine will go since it's their first v6 camaro their tuning. I'll let you guys know how it goes

[97rs4life]

Re: bigger injectors stock tuning

yea they are in for a nice surprise. lol. You will leave still using that FMU