I just bought a set of 4 new JCW 380cc injectors from MinSpeed.net. Wondering if they are flow-matched. Or any significance on sending them out to flow-match before putting them on? How much difference is between with and without?

 

they will be clean and as flow matched as they can be. If you run them for a while, the build up on them will get them to diverge a bit. FWIW, I used a company called witch hunter (www.witchhunter.com) to clean a set of injectors a while ago. They were about 4.5% peak to peak before cleaning, and 1.1% after cleaning.

Usually, flow matched injectors cost more because they are tested and a a set that matches very well are picked from the "new" bin....

Matt