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[StreetDragster]

Hi Everyone,

What does the Amal valve on a FRST look like? I'm trying to see if i have one as i have been told that i can use it to make a two stage boost controller, but i have also been told that a few people remove them.

Anyone know how i wire it up to do this off a toggle switch?

Thanks in advance

Matt

[xrsi]

the amal valve is useually on the drivers side if you have a t2 turbo.... its a round thing with a multiplug and a vacume sort of hose on it! has two locating brackets at right angles to the body of it as well....

useually it wil be somewhere ilke conected to the airbox or such like!

you CANNOT use an frst amal valve for 2 stage boost... u need an erst one!

[StreetDragster]

Great info!

Don't suppose you know how to make one from a ERST amal valve do you?

Thanks

Matt

[Sunil_FiestaRS_16V]

is not bad to turn up the boost via the amal valve as the fueling wont be right for the set boost??

[Excursion]

is not bad to turn up the boost via the amal valve as the fueling wont be right for the set boost??

If you use the Amal for 2 stage boost, then the highest setting will still only be the max boost you are seeing now. The second stage will be actuator boost which will be around half

[StreetDragster]

Right, so the amal valve becomes a sort of electronic bleed valve/boost solenoid?? If the boost level is set on the actuator, then i assume there is no point trying to use an amal valve as a two stage boost controller?

[Sparky]

You can use the FRST amal valve as a 2 stage boost controller but as standard the amal valve only bleeds off around 3 psi so without internal modification (and I don't know what this involves) the adjustment between high and low will only be around 3psi.

To wire it up you need one wire to ground and the other wire to your switch which will switch on an ignition live. When your switch is on, it will hold open the valve, bleeding the pressure and giving you the high boost setting.

Always get your car set up on the high boost setting.

Switching off will close the valve and boost will be controlled solely by the actuator. Low boost setting.

As standard the actuator on a FRST is set to only aroung 4psi and the 7psi boost is maintained by the amal valve.

I am currently switching between 6 and 9psi, its just a bit of a gimmick really 'cos I never use low boost.

[StreetDragster]

Cool, thanks very much thats a great help!!

Thanks again

Matt

[GavStyli]

You can use the FRST amal valve as a 2 stage boost controller but as standard the amal valve only bleeds off around 3 psi so without internal modification (and I don't know what this involves) the adjustment between high and low will only be around 3psi.

To wire it up you need one wire to ground and the other wire to your switch which will switch on an ignition live. When your switch is on, it will hold open the valve, bleeding the pressure and giving you the high boost setting.

Always get your car set up on the high boost setting.

Switching off will close the valve and boost will be controlled solely by the actuator. Low boost setting.

As standard the actuator on a FRST is set to only aroung 4psi and the 7psi boost is maintained by the amal valve.

I am currently switching between 6 and 9psi, its just a bit of a gimmick really 'cos I never use low boost.

how exactly could i do this, would come in usefull when i leave the car at mechanics

[Sparky]

Pretty straightforward and as described above.

If using it as a kind of Valet system you could substitute the toggle switch for an electrical key switch that would require a key to switch on and off

[StreetDragster]

Now thats a good idea!

Thanks

Matt

[Jur]

I myself have the switching amal valve too..

but i just use the following method (without loosing the overboost protecting principal of the amal valve)

just cut one of the wire's .. (the one with the 12V on it)

wire it up to the inside
place a switch (of a rear-fog light for instance)
wire up the switch with the incomming wire..

put the wire that comes of the other end of the switch back again into the engine bay.. and to the amal valve..

now hook up the 2 wires to the cut wire..

You now have a 2 stage boost control, with light (high boost) or no light (low boost)

You can even make it a 3 stage boost control or even more ...

All you have to do is take another amal valve.. and a T piece and some tubing.. for every extra stage you want..

put the t-piece in between the T piece that is already there and the amal valve..

use some tubing to connect the (right side of the) amal valve to the tubing..

electrical connection of the 2nd amal valve.. just use gnd on the one side.. and a switched 12V + on the other..

and there you have it.. 2 switches.. and 3 stages..
0 switches .. run low boost.. (4psi)
1 switch .. run middle boost (7psi)
2 switches.. run high boost (10psi)

Contact you local electronics shop .. the might have a selector switch .. and if you are handy enough (using some electronics/relays).. you kan make a boostcontroller using this pricipal with just using a selector switch (like a in-car boost dial.. with 3 or more positions..

[BUTRE]

something does not sound right...

you have your FRST fuel setup for 16PSI of boost for example, and you guys are geting down on boost? This way you're getting way to rich mixture.

or you're doing the other way around? fuel is setup for 8psi (std pressure I think) and you getting the boost up to 16PSI? getting a lean mixture... too hot combustion, overheat and engine meltdown.

I'm not in love for "in car" boost switches, unless they setup both injection and boost pressure for diferent "stages".

[StreetDragster]

Thought the fuel pressure was raised by the Fuel Pressure Regulator, which uses manifold pressure as a reference. therefore if you are set up for 16psi, and only run 8psi, the mixture stays the same, please correct me if i'm wrong

Thanks

Matt

[BUTRE]

I think the best way is to setup the fuel pressure to the highest boost you're going to run. Then boost down the turbo... but by doing this you will have the too rich mix.

[Jur]

so .. long live the flame-thrower :-p

[BUTRE]

eheh..

seeing black smoke coming from exhaust pipes... too much unburned fuel going to waste.

[Sparky]

Boost Pressure is sensed by the MAP sensor and the correct amount of fuel added. As long as the car has been set up for the maximum you will run, all stages in between are catered for.

In a standard car, when pootling around off-boost the engine is not running too rich.

[BUTRE]

hum...

Has I know, MAP sensor is for the ignition advance and retard, not fuel. Dont know if it has other kind of use on the FRST.

FRST doest not have lambda sensor, so no reading of the oxygen on the exhaust... there is no way of the ecu knowing if the mix is rich or lean. Even if it had a lambda sensor, only till a certain rpm would be able to read the mix (somewhere up to 4000rpm).

[voorhas]

On a general basis, a MAP is a sensor that transforms manifold pressure into a voltage reading... you can use the info it gathers for anything, really... including setting the air/fuel mix.

Goncalo D.

[saqmaster]

The fuelling map on the car is boost vs. engine speed.. boost is read by the MAP sensor The ignition map in the ecu also used the MAP sensor.. boost vs. engine speed.. as well as throttle angle, water temps, charge temps, many things.. you wouldnt believe how many maps are in eec-iv!

Oxygen (lambda) sensors are only used for part throttle anyway, for emissions.. Their limit is nothing to do with revs.. narrow band sensors are just switches anyway, they switch high or low depending on whether or not they below or above stoichometric..


I think that answers the questions...

[Ben RS Turbo]

If I understand, the map sensor give information about the turbo pressure, and this information are used in order to correct fuel injection...

so what the role of the amal valve???? I think it cut injection if boost pressure is too hight.
My version of chip (165BHP) run as if the amal valve isn't here....

can you explain me.....now I can unplug my amal valve without change for my car

[BUTRE]

If I'm not wrong, the amal valve its a solenoid valve that bleeds the boost away from the actuator.

Maybee the 165 chip ignores the amal valve not using it.