1999 NB with BRP MP62, 330 injectors. Running low on fuel at the top.

Which Walbro fuel pump to buy?

 

255hp

 

Want to make sure I get the right thingamujig.

 

This, or if you can justify an extra 60 bucks go ahead and get the Deatschwerks 300lph pumps for a lot of extra head room.

 

If you have a feul returnline from the injectorrail you'll probably fload the FPR, raising the fuel pressure at idle. There is a Miata turbo Wiki that gives a guideline for the pump.

Here you go:

http://miataturbo.wikidot.com/fuel-pump

 

Not the NB. 255HP is win on the NB.

 

i totally have a 255HP to sell too.

 

Get the neew super awesome mega flow 400lph wally!!! Love

 

255 +1

 

No. This one!

http://www.full-race.com/store/fuel-...ro-400lph.html

 

yup 255 is what i ran on mine

 

255 i= win. 300 = more win. 400 = epic win. 255 is fine for me at the moment tho

 

theoretically the 255 is good to a little over 500 bhp on the NB (@ 60psi)

 

You are getting annoying really fast.

 

Simple math crew checking in:



ID1000cc injector @ 87% DC, ~14v, and 72.5psi (for example) flows ~1000cc/min.

Therefore 4 of these injectors is 4000cc/min.

1000cc per liter
60 minutes per hour
cc/min * 0.06 = liter/hour

4000cc/min = 240lph

A DW300 flows ~255lph at 72psi.

A while ago, I used Injector Dynamics' online calculator to get some basic horsepower capabilities for ID1000s at various fuel pressures. ID1000s at 70psi will support ~750bhp on gasoline at 70psi, or ~550bhp on E85.

Since the DW300 will flow enough fuel to support the flow capacity of the injectors, we can therefore say that a single in-tank Deatschwerks DW300 fuel pump will support 650+whp on gasoline.

Someday I will decide to crack 500whp on E85. Probably not with the 2871R, but as soon as I can actually get my hands on a twin-scroll BW 7064 .92a/r I'll switch over and see what that turbo will do at high boost. Since 240lph is a safe number for 400whp, 25% more fuel is 320lph. The DW300 will clear 325lph, but only at 30psi, so I'll use a DW300 in the tank and an external Bosch 044 to knock the fuel pressure up to ~90psi. This is the smart way to do a big power fuel system, since the track crew knows the importance of having the OEM fuel sock in the OEM location in the tank.

 

I'm using a Bosch 040 intank...

 

I use the 190hp with 305's and at 10-11psi I have no issues.

 

+1. I like the Walbro 190HP. I ran one in the black car when the stock pump crapped out around 220whp.

 

I have the walbro 255hp. It's annoying loud with the hard top on, and the pitch changes when you have the turn signal on. Holds a steady 40psi at WOT though.

 

still hanging onto that dang ole fuel pump?