I've pulled the sparkplugs a few times now, and the second cylinder on the right has been consistently lean in appearance while the others have a pretty good tan color. I know this mainly represents around-town driving, but lean is still lean. I'm thinking of buying a few more stock injectors and sending them down to RC Eng to have them flow tested to find the most consistent set of four. Anyone ever do this?

 

Just got my injectors back from RC (bought a used pair of 750's). Two of them, after cleaning and servicing, were at 750. 1 was 753 cc and the other was 754. That's within .05% of one another. On my Evo, cylinders 2&3 looked the most lean (looking at the exhaust mani runners after pulling it off) so that's where Mr. 753 and 754 are going


P.S. I am resending that e-mail.

 

Could be alot more to do with the stock intake manifold flow design then with injector flow. One cylinder might be getting alittle more air from a better flowing runner. Yes flow matching is a great thing to have done, especially on any car that doesn't have the ability to fire sequentially. With flow matching at least you know each individual injector is flowing the same as the one next to it and all cylinders are getting fueled equally.