twkdSS

Can anyone recommend what fuel injector size for a 2005 Cadillac CTS-V with a LQ9 416 stroker, 228 cam, ls6 intake, headers. Currently running the stock 28 lbs.
Thanks!

G Atsma

Actually your stock injectors are 25.2#, not 28#, according to Summit's LS database

twkdSS

Thanks. Any recommendations on upgrading? the stock ones maxed out on the dyno today and not sure which ones to go with.

G Atsma

How much power are you now making (fuel limited) and how much do you plan on making?
Do some quick math and you will arrive at your fuel demand.
Get the next injector size over your new fuel usage number and you should have no trouble.

RedXray

You are limited to either adapting a factory injector like the Gen4 L96 (12613412) 50lb/hr Flex Fuel truck injector ($100 set of 8) or buying aftermarket. The LS1 and LS6 injectors are the longest in the LS family so running any other factory injector will require a cup like spacer to lengthen the shorter factory injectors. The connector is also different so it would need a harness adapter.

The guys over a ICT Billet have a nice factory LS injector chart with measurements. You can see the LS1 adapter cup above the L96 injector. It's either adapt or go aftermarket. There is good data on the Gen4 L96 injectors converted over to Gen3 format.

Attachment 712074

gametech

iTrader: (1)

Siemens Deka 60lb injectors used to be the go to injector for pretty much any ls1/6 length upgrade, because they were idle tunable and could flow a lot at higher pressures. Now that another 15 or 20 years have passed, I would think the price on them should be lower, but they are still capable.

gagliano7

As RedXray said the 50 lb injectors would a good choice since tuning is simple with them. You will connector adapters for your harness to the 50 lb flex fuel injectors.