Maybe a solution for FMU system

[Stou]

I read an article in the HCI (february 2003) about turbo and return-less system like the one we have on our car. They said that its the ECU that control the fuel pump and adding a bigger pump can't correct the problem. It can even cause more problem like erratic iddle and poor drivability.

But they also used a device on a Turbo Focus that use the same kind of return-less system. They used with succes, a device called BOOST-A-PUMP product review
BOOST-A-PUMP site


It can control the voltage and make the stock increase the fuel flow up to 50%.

Maybe it's a solution for those who run turbo with FMU and have some fuel problem.

 

[70]

Interestingly, the Kenne Bell web site has a twin screw super charger for the 1.8 liter Miata.

But, on topic, I thought we determined that the fuel system was a return type and that an auxiliary fuel pump helped solve fuel pump problems.

I thought the main problem with the fuel set up was the ECU, which once fixed will solve all the fueling problems the F/I guys are having.

 

[spoolinmp3]

Yes I am famailiar with this Boost a pump unit and it will work on our cars just like many other things. However Stuutters is correct we do have a return line fuel system.

 

[LinuxRacr]

However Stuutters is correct we do have a return line fuel system.

I concur.

 

[Stou]

I never check it and I heard that we have a return-less system.

So now I'm happy to know that's it's a return system type. Thanks guys!

 

[spoolinmp3]

So now I'm happy to know that's it's a return system type

We are all happy

 

[falkofire]

anything new wit your car lately stou...u still running 8 psi daily?

 

[Stou]

Not much right now Falkofire, I'm still rining it at 8 psi, no problem. I just got an Autoexe replica lip and a grill but not installed yet. I also did and airbrush tribal design on my hood (the one with scoops). Here it's winter, -25 celcius and snow.....

But my Turbo MP3 still runing good, even in those condition!

The next thing I will need it's a piggy back to retard the timing and mapp the fuel, anybody have something new for that?

 

[spoolinmp3]

Man post pics of your car with the new parts installed asap!!!

 

[Stou]

I will probably not install them before something like 6 weeks.

Like I wrote it earlier, it's winter here :mad:, we got snow and I don't want to broke the lip in the snow!!!

You will have to wait until March before I install my new stuff!

 

[twizyours]

The next thing I will need it's a piggy back to retard the timing and mapp the fuel, anybody have something new for that?

I got my 2002 MSD catalog in today and they have a DIS 2 that you can plug into a computer and change the igntion timing, they also have this box to retard timing for miata, I dont know if the miata one will work for our cars but thought it was nice to see Mazda vehicles to have a exclusive product. Will try to scan and post soon.

 

[twizyours]

Dis2

http://www.mazdamp3.com/members/twizyours/dis2.jpg

Miata Boost Retard

http://www.mazdamp3.com/members/twizyours/miataboost.jpg

 

[Stou]

Here's the answer I got from MSD in May 2002.

The first one is:

Dear Sir;

I would suggest using PN 6212. This is a fully programmable DIS 2 with mappable boost curves. If you would like some more information on this unit, send us your mailing address and we'll send you out our latest catalog.

Thank You,
MSD Tech

One day after that, they wrote me back with this one:

Dear Sir;

Upon further inspection of the wiring diagrams, we noticed that the coils have integrated transistors. This makes wiring any type of aftermarket ignition impossible. We're looking into producing a system but it probably wouldn't be available until next year sometime.

Thank You,
MSD Tech

I need to check with them if there's any new device that can fit on our cars!

 

[70]

Well, that's cool that they at least looked at stuff and realized what was needed...

 

[Kooldino]

What's the diff between a return and a returnless?

 

[Chojin]

Kooldino -

A returnless fuel system does not have a fuel pressure regulator or a return line from the fuel rail back to the fuel tank.

Cheers.

-Shawn

 

[spoolinmp3]

Hence its a big pain in the tush to actually run an FMU or FPR since one would need to devise a fuel line running back to the fuel pump ect. Alot of newer cars on the market are like this such as the IS300 and matrix

 

[Kooldino]

IS300 and matrix are returnless?
and returnless is bad, right?

What does having a fuel line back to the tank accomplish exactly?

 

[Stou]

On stock car, it is just a return line for the extra fuel to return to the gaz tank. On a car with a FMU, it's more fuel supply for the FMU.

 

[Kooldino]

How does it "supply" fuel with an FMU? Do we force air into it to create positive pressure on the incoming line or something?