8:1 Fmu good enough?

i was told that i can run a vortech 8:1 fmu for my turbo set up and it would "plenty enough". i am running all of spo0Ls stuff, tubular manifold, t3/t4 turbo, 2 1/2 down pipe, big interco0Ler, stuff like that, and you think a 8:1 would be good enough? thanks for the advice

Keola
 
No thats not good enough especially for that turbo. You will need an inline pump and a 12:1 FMU. And keep the boost at 5-6 psi with that sized turbo on 92 octane
 
KEOLA!!!!!! DO YOU EVER LISTEN TO ME OR WHAT!!!!!
 
Also, what's the ratio mean? I take it as...

additional fuel psi:1 psi of boost
 
markmurray77 said:

Eek. So we're ADDING 12psi of fuel for for every psi of boost?

So @ 8psi, we'd be adding 96psi of fuel to our stock 45psi = 141psi of fuel?????? This sounds a bit ridiculous. Besides, our pumps die at mid 70's in psi, don't they???
 
from what i understand man it doesnt push more fuel to the fuel rail, but instead restrict all the fuel from coming out, so it in turn keeps more psi of gas in the injectors or whatever. so it doesnt use the fuel pump, just restricts the fuel from leaving and going back to the gas tank. i think thats how it works

Keola
 
that FMU is a fixed unit
if it is a 12 - 1 it will adlust to 12psi of fuel for every1 pound of boost
this system has alot of draw backs
you need an ADJUSTABLE rising rate reg from BEGI and the proper piggy back to control the pulsing of the injectors

as for how it works it mounts after the stock reg
it basically controls how much will return to the tank from the info it recieves via vacuum
 
howmuch is that stuff from begi? and terry, you sell that stuff??? i need anything that will make this car smooth idling and riding
 
call kieth at flyn miata
the reg is a step in the right direction
check fuel pressure first and then go over all your connections
are you using a piggyback

they run like $240
 
you need an ADJUSTABLE rising rate reg from BEGI and the proper piggy back to control the pulsing of the injectors
Now perfworks why come on here and misinform people:rolleyes:

There are PLENTY cars running an FMU without problems, you have to be very careful in telling people what to do and then giviing them false info.
you need an ADJUSTABLE rising rate reg from BEGI and the proper piggy back to control the pulsing of the injectors
as far as modifying fuel requirements an afpr basically is just like an FMU. However the afpr can be tweaked and the FMU uses little disks to alter fuel pressure


To awnser your question Keola
Yes you can use the FM fmu. Will it help alleviate your problem? Most likely not.
You need to check vacum leaks first like I stated in the other thread. Unless the FMU is damaged it will not affect idle because it is not adding fuel at idle. Remember an FMU is boost referenced so it does not affect anything if it does not see boost. Hence it will not affect idle.
Just verify if you have it hooked correctly. Because from what we discovered on Little Beavis's car if the FMU is installed incorrectly it will damage the unit and it will dump fuel all the time even at idle.

The 2 nipples where fuel go in and out should be connected as follows:

The FMU splices into the factory fuel line before it goes into the oem fuel rail. The top nipple connects to a vacuum line that will provide boost to the unit allowing it to increase fuel pressure when needed. The factory fuel line will need to be cut (fuel line coming from gas tank) this will be inserted in the intake of the FMU located under the unit. Then the outlet located on the side of the unit will connect to the factory fpr (fuel rail)
 
in all respect spoolin i dont think i am misinforming them
how can you say it does nt affect fuel pressure at idle
when first you say it mounts BEFORE the fuel rail and second dont you have to set base line pressure in order for it to start at a reference point at boost?
all i said is that that particular fmu has draw backs
the BEGI unit allows adjustability to the individual turbo set up
the vortech one does not
i also stated that it was a good step BUTTTT the need to check all connections is the primary course of action
also i stated that i needed some more info
such as what typr of module is being used

sorry for the miscomunication
 
all i said is that that particular fmu has draw backs
how can you say it does nt affect fuel pressure at idle
when first you say it mounts BEFORE the fuel rail and second dont you have to set base line pressure in order for it to start at a reference point at boost?
Ok lets get this straight.
First the FMU is a great unit for what does. So dont knock it if you have not tried it on a turbo protege.
The FMU does NOT affect fuel pressure at idle. The base point at where it starts increasing pressure is already internally set by vortech. This is a hair before positive manifold pressure. As far as adjustabilty yes it is very adjustable. With a callabration kit you can adjust the fuel pressure accordingly. We have them at a 12:1 ratio for 6-7 psi of boost and they are running 12:1 to 12.5:1 ratios at WOT. And there is no need for a piggy back system to run safe a/f ratios at those boost levels
the BEGI unit allows adjustability to the individual turbo set up
not true
 
if you dont use a piggyback or something to interface with the stock ecu you will NEVER get the A/F ratio you desire
my point with the adjustability is that a kit is not needed for the begi unit.
i have used the fmu from vortech
im not saying its not a good unit ive used it on many hondas
but for ease of tunability the begi unit is superior
i guess thats just my opinion
 
if you dont use a piggyback or something to interface with the stock ecu you will NEVER get the A/F ratio you desire
So what type of piggy back system are you talking about?
Link, emanage, or something else? Currently all the turbo kits on the market run just simple fmu/afpr. So they are not running piggy systems. Do you mean an o2 signal modifier or voltage clamp? Because our kits include those.



but for ease of tunability the begi unit is superior
I agree with you on this. Instead of changing out disks you simply tweak a screw.
 
there are many on the market like you say but nothing for this particular vehicle that is of relative ease to use
or even a haltech etc. has to be hard wired to work
thats a pain
i am or should i say will be installing a module that i program from my laptop. it controls up to four drivers ( i believe, it might be three i have to check)
it come from a gentleman out here in jersey called MODERN PERFORMANCE
i can control spark retard or adv.
fuel, o2, and boost
as soon as i have more info this week ill let you know
 

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