BOV, Air Intake and FCD

[gonzfonz]

I am planning on buying a BOV, an air intake and an FCD for my '91 MR2 Turbo... what brands would you really recommend in buying that can improve performance?

[JekylandHyde]

Any BOV you buy will rob performance, not give you any.

There is no reason to buy a FCD, unless you want fuel cut protection. Otherwise, you can eliminate FC for free by capping off the vac line to the OEM map sensor.

I recommend the K&N intake.

[willowlee]

Originally Posted by JekylandHyde

Any BOV you buy will rob performance, not give you any.

There is no reason to buy a FCD, unless you want fuel cut protection. Otherwise, you can eliminate FC for free by capping off the vac line to the OEM map sensor.

I recommend the K&N intake.

is it still safe to not get a fcd and just cap the vac line off?

[Im JDM Yo]

Originally Posted by JekylandHyde

Any BOV you buy will rob performance, not give you any.

There is no reason to buy a FCD, unless you want fuel cut protection. Otherwise, you can eliminate FC for free by capping off the vac line to the OEM map sensor.

I recommend the K&N intake.

Wait wait.. whats the difference of buying FCD, and capping off the OEM map sensor vac line?

[JekylandHyde]

willowlee, if you cap the vac line off you have negated the reason for owning an FCD. It would be pointless to do both.

Fuel cut is a built in protection device to save your engine from over boost. Fuel cut from the factory is set at 12 psi (91-93 mr2s and 16 psi on later MR2s).

A fuel cut defencer allows you to RAISE the fuel cut point. The maximum you can raise it to is 17.7 psi. If you want to run more than 17.7 psi of boost you HAVE to get rid of fuel cut.

The OEM map sensor only does 2 things:
*controls fuel cut
*operates the OEM boost gauge (which is worthless)

So, if you cork that vac line you will 100% eliminate fuel cut (and the OEM boost gauge will stop registering).

You can by an HKS FCD and raise the fuel cut.

The GReddy boost cut controller eliminates fuel cut ... so it is worhtless to buy it since you can eliminate FC for free.

Hope that helps.

[gonzfonz]

Right now i am running 13psi but i get fuel cut at 14psi.... how much psi can a CT26 withstand if I am running standard engine with no heavy mods?? I want to know this because I am planning on getting rid of the fuel cut and set up my boost up to 15 or 16psi... will I have any problems with this?

[JekylandHyde]

Beyond 15 psi you are out of the CT26s efficiency range and you are increasing your chances of detonation without adding a significant amount of power.

General rule of thumb is keep the CT26 to 15 or less psi.

[gonzfonz]

do you know where i can find a guide to cut fuel cut? any instructions in how to?

[JekylandHyde]

I'm not sure what you are asking.
Do you want to eliminate FC or raise it?

[gonzfonz]

i want to eliminate it since i don't want to buy an HKS FCD.... that is what i want to do

[MR2Driver]

Just cap off the OEM map sensor vac line

[willowlee]

how dangerous can it be to run without a fcd? what can it do to ur car? is it worth it to get a fcd if lets say, i'm boosting around 15 psi or less on a greddy tdo6?

[JekylandHyde]

The danger is if you overboost ... FC protects you from this. The most you can hit is 17 psi.
Without FC, you can hit whatever boost ... assuming boost controller failure.

[gonzfonz]

what do you mean by OEM??? Is it the same as the Vacuum Sensor (Manifold Absolute Pressure Sensor)??

[JekylandHyde]

OEM = original equipment manufacturer.

It's short hand for "the part that came on the car when it was new."