fuel injectors

[boostedc10]

Just to clear up a few things about injectors and sizing;

The PSI the injector was flow tested at only gives you a reference of where the injector puts out the advertised lb/hr, nothing else. An example is the deka 60's which are flowed @ 39.15 psid. Put them in an application like a boosted LS with a rail pressure of 58psi they flow more lbs/hr (about 73#s).

Hart is right, having the data is good and most reputable injector companies will have it. Any good tuner should have most of this data though so its not a deal breaker in my opinion.

Almost every LS based engine out there runs a base line pressure of 58psi, including the LS1. When you see an injector lb/hr for them they will be at this PSI not the 43.5 (unless noted).

Not saying Rob is wrong because many of the LS injectors used are also used in other applications and more than likely flowed at 43.5 by the manufacture.

In the end you need to figure out what lb/hr your engine requires at 58 psi and buy the ones that match the closest. If you are between 2 normal sizes go up not down. 40's for your combination will work just fine.