Went today to tune after firing up my engine for the first time

made 403rwhp 407rwtq on a dynojet

But car is still running lean on higher rpms HP Tuners reading saying injectors are 120% !!!

Motor is Stock bottom end LQ4

Patriot #243 Stage III Heads
Comp Cams XER273HR 224/230 581/591 114lsa
Stock Lq4 Intake untouched
Vararam Tri Power CAI
Pacesetter's LTs
Offroad Y Catless
backed by a built 65E
stock verter
and all the possible boltons (UD Pullies etc.. except TB)

Any ideas which injectors to get? 8.1 maybe?

 

get bigger injectors
j/k manm for a good plug and play injectors grab some 8.1l "Marine" injectors.
at our fuel pressure they flow about 42lbs

 

really? maxed out on pretty much stock motor? like pewter said buy new ones or you can have one of the guys on the ls forum modify yours is it worth it i really dont know you will have to ask someone who has had theirs done. I wonder where my 42lb injectors are at on my set up hm...?

 

How is it pretty much stock? It's got worked over 243 heads and decent sized cam. That's not hard to do with a 6.0 with stock injectors. I maxed out my stock injectors with a cam and bolt ons with my 5.3 and they use the same injectors as the 6.0s.


OP, I'd go with the 8.1 Marine injectors for longevity. They should handle just about anything N/A wise.

 

Very similar to my planned setup, same cam specs and everything (although I've been considering the EPS 224/230 lately). I sold my gas 8.1 injectors (29.9#) as the info that I gathered said they would be cutting it close...seems everyone recommends the Marine 8.1 injectors (42#)

 

dont forget to add a 255 in tank fuel pump

 

Thank you FLaco i forgot to mention that, I have a corvette intank pump

 

bigger pump, and bigger injectors...