FlowForce

FlowForce NA/NB 640cc Injector Kit

Name: FlowForce NA/NB 640cc Injector Kit
Rating: 4.50 (8 reviews)

FlowForce NA/NB 640cc Injector Kit

$329.00 USD

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Shipping calculated at checkout.

Add a DW200 Fuel Pump? No Thanks 94-05 DW200 90-93 DW200

We build injectors for Flyin' Miata. When the biggest name in Miata performance needs injectors, they come to us. The kits on this page come off the same bench in Tennessee.

The FF640 is FlowForce's flagship plug and play injector kit for NA/NB Miatas. Flowing at 640cc in NA Miatas and 739cc in NB Miatas, these deliver clean idle quality plus the headroom for serious street and track builds.

We start with large batches of new OEM EV14 injectors and match them into sets flowing within +/-1% at both idle and wide open flow. Careful matching is essential at this size, since small variances in idle flow hurt drivability on a 4-cylinder. We then package the matched set with carefully designed components to make them plug and play in NA and NB Miatas.

Good for around 300-350hp on a turbocharged build. The FF640 is the right pick for most Miata projects.

Rated flow is measured at 3 bar. NA cars run 3.0 bar and NB cars run 4.0 bar, which is where the higher NB number comes from.

Add a DW200 fuel pump to your kit above, shipping included. The DW200 is the best pump for most people. It uses stock wiring and requires no changes to your tune.

Plug and play for 1990-2005 Mazda Miatas. Requires standalone engine management.

Installation and configuration guidelines:
goflowforce.com/pages/instructions

Goes well with

R8 Ignition Coil Kit, cleanest install on a confirmed ECU
LS Ignition Coil Kit V2, works with any standalone ECU
AMP Plug-and-Play ECU, if you still need engine management
Injector Seal Kit, cushions and O-rings for future service

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5 stars: 7 (88%)
4 stars: 0 (0%)
3 stars: 0 (0%)
2 stars: 0 (0%)
1 star: 1 (13%)

Ordered the injector kit for my 1.8 turbo-charged Miata setup and they work beautifully! Smooth acceleration and graphing through the whole fuel curve. Had them in about a year now and they still work beautifully.

I had to remove the filter screens to clean out dirt that came through my fuel lines from the vehicle sitting so long prior. But these filter screens made it super easy to clean out and get it back up and running. Definitely recommend

Was asked to review them. Have not even received them yet.

The injectors are prefect and very high quality
And the customer service is 20/10
Highly recommended

Very nice package with all the necessary to mount the injectors. At the moment everything is ok, I use the video attached to see how to mount them.
Honestly I didn't understand that the shop is in the USA by the way, that was not a problem.

640CC Injectors and DW200 Fuel pump. 2004 MazdaSpeed Miata. Put in a Beer Money Motorsports ECU and a tune. Car is much more fun, picked up 40HP just with injectors and tune.

Worked great on my 92 NA Miata. It does require some ÉCU tuning and I wish the dead times would be provided on the data sheet (I was able to find them on the website), but that is expected hurdle.

Worked great on an M45 1.6 NA. Kit is excellent and fit perfectly. Even included some spares in case you drop something into the engine bay abyss.

Noticeable difference in performance. Car idles smoothly, injectors are a little louder than the rx8 550cc ones I ran but I'm glad I made the switch. Highly recommend for a street car.