I'm thinking about getting the secondary fuel injectors off of an AT RX8, (given the fact that they are 500 cc's) for my car (6 sp., but secondaries are a bit smaller at 400 cc's). Just wondering if anybody has a part # for them. Kind've difficult to talk to Mazda dealerships without part #'s. Want to look at increasing boost but this is one of the first steps. I want to increase fuel delivery.

Why do the automatic Rx8s have largersecondary fuel injectors anyway?

fiveomotorsport.com

just tell them what type of injector and see if they have the 780's in stock. probably 1/4 the cost of mazda OE too.

Why do the automatic Rx8s have largersecondary fuel injectors anyway?

Four ports maybe...

Yep, because they only have 4 on the AT model vs. 6 on the 6 sp.

The guy who has installed GReddys kit on his automatic Rx8 was saying he needs to upgrade HIS injectors to 550cc

. Jumpers 5 and 6 inside the emanage were turned off. I am using just the additional injector map to control the 4 injectors. My initial tuning has the air/fuel ratio in the 11 range. I would like to gradually lean it out to about 11.5. The only problem is that the injectors are running at about 95%+ duty cycle. This is too high, so I am going to replace the secondary injectors with 550 cc ones from RC Engineering.