daves12secV6

iTrader: (3)

will lt1 injectors work on with the stock v6 ecm?
reason im asking is cause my 3.4 injectors arent big enough for the twin turbo setup.i was gonna get a stock set of tpi injectors but those are gonna be to small.and i can get a stock lt1 24# set for 60$'s
i dont want to spend the money on new aftermarket injectors caue it looks like i will be selling the car shortly

redbird8628

iTrader: (1)

a fourth gen guy(tiago) runs them on his 3.4 turbo with no problems, im assuming he has a tune to go from 17lb injectors to 24 lb injectors, they will plug into your harness, and get a tune, and your good to go.

daves12secV6

iTrader: (3)

thnx man yeah i have 17# injectors now and there to small,
anyone have any idea what fuel presures and lt1 runs at,wanna make sure in not gonna have to bump fp to get that 24# flow out of them

redbird8628

iTrader: (1)

i think it is 45, but i also dont think it matters, a 24 lb injector in an lt1 will still be a 24 lb'er in a 2.8, but if i am wrong, which i dont think i am, nothing a afpr cant help to set the needed base fp. are you gonna use a FMU or tune the ecm for fuel?

daves12secV6

iTrader: (3)

i have an fmu on the car now and with a 12-1 ratio disk the car goes lean at high rpm @8-9 psi with 17# injectors,and thats whith the single turbo.if the 24# injectors are large enough i should be able to tune with the wideband and fmu,cause the maf deff maxes around 5-7 psi.the 24# injectors will deff require ecm tunning though so it dosent idle dead rich,with the 17# ones i didnt have a problem

RBob

iTrader: (1)

The LT1 24#/hr rating is at the nominal 45 psi that the 3.1l runs at. In the LT1 they run them at 58 psi for 28#/hr of flow.

They will plug right into the 3.1l harness and rails. Just remember that they are Multec's. And have the Multec issues.

RBob.

daves12secV6

iTrader: (3)

rbob its 2.8 they are going in.what issues are ther with the multecs?are those the ones that lock up above 80 psi fp?i can get a set of used 24# svo injectors instead but im trying to spend as lil money as possible.since i hav somone comming to look at the car next week to possibly purchase the car.(and they know the car is going to need tunning)

RBob

iTrader: (1)

Biggest issue with Multec's is that the windings short. This causes all kinds of problems. If you can measure the coil resistance prior to purchase, it is a good idea.

As for increased pressure, the differential pressure needs to be kept below 60 psi.

Differential being fuel pressure minus the manifold pressure. Say, at 6 psi of boost: 6 + 60 = 66 psi max fuel pressure. It is typical for them to start locking up somewhere between 60 and 65 psi of differential pressure.

RBob.

daves12secV6

iTrader: (3)

so if i run 14+ psi boost i can prolly get away with 74#'s fp?