Mazda MX-5 Miata

Anyone know the max flow fuel injectors you can upgrade to with a stock ECU?

Anyone know the max flow fuel injectors you can upgrade to with a stock ECU?

10 Answers

Get a fuel management unit.

Im running 330cc of a 2jz na on stock ECU no problem so far

What size it stock?

There’s plenty of injector calculators out there. And with a adjustable regulator you can push them up to 50-60 psi and get a little more from them

I think as long as their below 400cc and comes stock off another car. Could be wrong.

Going to any other injector without tuning for them is going to make it run rich all the time.

Get an FMU.

I had read the Supra 305’s were about tapping it out.

I ran 7m non turbo 305cc injectors from a supra before I went MS. Even with an fmu this is around the max you’ll want. I originally had rx7 420cc injectors with fmu and it would just run super rich

Running 285cc on a stock 97 ecu. Reset the ECU and it runs a bit rich but it’s at 14.7 now after awhile.

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