Im planning on the MSPNP this spring and just ordered a walbro 190, and dont want to make any additional upgrades that will be rendered useless with the MSPNP, do i need a upgraded fuel regulator, currently using a vortech FMU.

 

no. injectors.

 

Get rid of the vortech, the stock regulator is fine. Your next purchase should be some injectors. 440-550cc injectors depending on how much power you plan to tune for.

 

Is a walbro 190 the preffered pump 'round these parts? We run 255's on the SR20's.

C

 

the 190 is proven to not overrun the stock fpr, the 255 might i don't know, regardless unless you're looking for big power the 190 is very sufficient

 

Thanks, that's the answer I was looking for. The 255's need an afpr to bring the pressure back down to 3bar on an sr20.

Oh, what would you say the horsepower limit is on the 190?

C

 

I currently have 1.8 injectors, what am I looking for if in 550 injectors for ease of install. basically looking for plug and play

 

I wonder if there's some sort of post that answers all these questions.....i wonder if it's stickied? i wonder if the title is super easy to figure it out?

 

Cancel your fuel pump order. You don't need it. Stock fuel pump will flow 300whp worth of fuel at stock pressure.

All you need for a comprehensive spark and fuel package for a Miata is the MSPNP, properly-sized injectors (460s or 550s depending on power goals) and a wideband O2 sensor. No fuel pump, no FPRs, no O2 clamps, no bullshit. Just a proper EMS setup

 

my 255 didnt overpower the stock fpr

 

I would put a fuel pressure gauge on your system to make sure your stock pump is up to par. Your pump may not be as strong as it used to be.

 

Yea im still going to install the 190 for insurance, its only 80bucks

 

Yes, installing parts you don't need in any way, shape, or form is a GREAT way to blow $80.

 

He has a 91, his fuel pump might not be in very good shape. It's not a complete waste.

 

the current setup, and I just wanted to test the photobucket link.

 

The guys at APE engineering hooked me up with a Walbro 195 High Pressure (HP), good up to 500 hp they said. Plenty of pressure and supply, they said most 4 cly don't need 255's, 255s just reciurculate more back to the tank. heat the fuel up by pumping it. That's after I went through 2 stock pumps, sometimes they hold when you raise the rail pressure, but not normally, I have heard of using a booster pump in line to help, but it's easier and cheaper to go with a 195. Just needed minor modification and it went right in.
It has worked good on two FI motors for over 200,000 miles.

 

But you aren't raising rail pressure with a PROPER EMS like the MSPNP. You are just adding injectors that will provide enough fuel at stock pressure. This is why bandaid guys need a 190HP for 200whp, but standalone guys can take stock pumps to 250-300.

 

here is the flow of a stock pump.

to determine how much HP the pump can deliver:

convert Gal/Hr to Lbs/Hr - Multiple by 6

Then Multiple that by .80 (duty cycle) and divide by .55 (BFSC) and see how much B.H.P. the pump is capable of flowing for.

example:

10psi would put you at roughly 60psi of fuel.

30 gal/hr x 6 = 180 x .8 / .55 = 260BHP

with that said, there are plenty of us running EMS greater than 250rwhp on the stock pump with plenty of fuel to spare.



I wonder where I pulled that image from? Man, if there was a collaboration of all these things in "one big post"