lxcoupe

iTrader: (8)

Hey all, I'm considering using a set of GM OEM LS3 injectors with the FIC (Fuel Injector Connection) extenders for my heads/ cam build.

FIC also recommended the new Siemens 42lb injectors.

What about the new Bosch Gen III skinny 42lb injectors, that already come with an EV1 plug and need no adapters at all?

redtan

iTrader: (5)

LS3 injectors with the top extenders work great and drive/idle like stock. All I had to change was the flow rate in the tune copied directly from a stock Z06 file. Done.

All of this for half the price of any aftermarket injector.

lxcoupe

iTrader: (8)

Any other opinions?

I'm wondering now about the GTP injector spray pattern, is it correct for an LSx application?

Is the GTP spray pattern the same as the a 42lb Bosch Gen III injector?

thunderstruck507

iTrader: (18)

I use the GTP injectors. For the price and ease of tuning you will be hard pressed to beat them IMO.

Werewolf SS

iTrader: (3)

Same, I use the GTP injectors as well. They are stated as 36lb injectors but the GTP uses a lower fuel pressure. On LS 58psi rails it equates to 42lbs. As far as tuning. I literally had to copy just one table to my tune from the GTP tune. That's it, you can find info on HPTuners forum on what table that is and what values to add. No other fuel injector tuning needed.

Can't get any easier.

mjs1012

iTrader: (36)

+1 on the white bosch (GTP) injectors. My tuner had zero issues with them and they can be had for cheap.

Mike Blanco

Where did actually purchase these GTP injectors from?

lxcoupe

iTrader: (8)

You can get them from the junkyard, eBay, the classifieds, or new from GM (they sell them individually and just buy 8). I bought mine new off the classifieds, then sent them to RC Engineering for cleaning and flowmatching. Well worth it to have an injector that is easy to tune, and plugs right into the factory connector.

Phil'sC5vette

iTrader: (4)

Ive been using the LSA 56# injectors for a lot of application

Mike Blanco

Do you have a part number for the 42#

redbird555

iTrader: (14)

do you have a gen III car or GEN IV? you cannot simply copy that data from a gen iv pcm and paste it into a gen III it might work but its not correct and the numbers will be off due to the changes in format between the pcm's.


i have ls3's on mine got them with low miles for 100 bucks. i then just used DSTECK's ls3/ls7 data from hptuers forum which converts it to ls1 format and pasted that into the tune and she purrs like a kitten