bigger injectors

[Alxsmt]

ok so i need bigger injectors, found out my 3400 and 3500 injectors will be too small and they cant be modified like i was hoping.. whats my options? i need at least 30#

[MY91GT(Z)]

some ppl r running trailblazer injectors if im not mistaken i think they 27-28lb injectors or else u could go w/ gtp injector at 36lb for like 160 on zzperformance.com for some brand new ones

[sprucegagt]

some ppl r running trailblazer injectors if im not mistaken i think they 27-28lb injectors or else u could go w/ gtp injector at 36lb for like 160 on zzperformance.com for some brand new ones

FYI,

ZZP used to sell 36# injectors but not lately and they are not new. There used injectors that have been cleaned and flow balanced. Last time I checked, they were not listed on their site.

[Alxsmt]

arnt the gtp injectors too tall for the 3400?

what year trailblazer?


EDIT: will these work?? http://www.jegs.com/i/Accel/110/1506...749691%7C10299

also could these be flow matched better that what it says they are? i dont know how close that means they are

[sprucegagt]

arnt the gtp injectors too tall for the 3400?

what year trailblazer?


EDIT: will these work?? http://www.jegs.com/i/Accel/110/1506...749691%7C10299

also could these be flow matched better that what it says they are? i dont know how close that means they are

Just the opposite, GTP injectors are too short. You'll need to grind off about 1/8" from the fuel rail bolt bosses or get the adapter plates from the WOT-TECH store.

For the trailblazer injectors you'll want any year with the inline 6 engine.

Those Accel injectors are flow matched pretty well, but I don't know if they will fit.

[Alxsmt]

hmmm, would it be possable to tune it so it wouldnt run rich cuzz those are a bit bigger than i need, im assuming it is (gonna get it tuned right after i get my engine in)

[merlot566jka]

im going with s/c 3800 injectors. they are 36# at 60psi. about 32 at 45psi

[IsaacHayes]

You can tune for large injectors, but if you don't need them then it's best to get close to what your motor will be using.

[Alxsmt]

isnt the 3400 55psi?

[merlot566jka]

i got 43 psi off my 3400 rail

[sprucegagt]

isnt the 3400 55psi?

Only on the 2000+ model years. 99 and earlier were 43 PSI.

[Alxsmt]

oh ok, so i have 55 then. im gonna have to look into that

[Alxsmt]

does any1 know what psi trailblazers injectors are rated at?

i found some for cheap and i THINK they will be enough for me. im hoping for 250whp im guessing that would be around 275fhp. but chances are it willl be only around 230whp or so. will those injectors be plenty????

[sprucegagt]

The trailblazer injectors are rated 28 lb/hr @ 55 PSI and they should be enough for your goals.

[Superdave]

Yes, 28lb/hr would be good.. you could also snag a set of 3.4 DOHC injectors and run them @ 55PSI for around 26lb/hr.