MegaSquirtPNP
#9
Former Vendor
iTrader: (31)
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 15,442
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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
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
#16
walbro 195 HP
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.
It has worked good on two FI motors for over 200,000 miles.
#17
Former Vendor
iTrader: (31)
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 15,442
Total Cats: 2,100
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.
#18
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
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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"
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empirewaff
Miata parts for sale/trade
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06-15-2015 08:59 AM