Turbosmart FCD-1 Fuel Cut Defender

[pepdebollox Junior Member Find all posts View Profile Close pepdebollox]

Have been looking at this bit of kit, has anyone used one and does putting boost up to 18 make a noticeable difference from 13 on a 1kz te.

https://i.ebayimg.com/images/g/FlwAA...d0/s-l1600.jpg

[adrian5800 Advanced Member Find all posts View Profile Close adrian5800]

I made my own, simple voltage tap with 2 resistors and 2 zener diodes. Clips the signal voltage from the map sensor to 12psi. Works well.

I can make more, if you want one, $50 posted

[carco Advanced Member Find all posts View Profile Close carco]

I'd go the electronic route. Anything pneumatic from turbo smart is notoriously inaccurate, especially at such low boost pressures.
Electronic FCD's have been around forever.

[pepdebollox Junior Member Find all posts View Profile Close pepdebollox]

Fitted 3 bar map sensor instead getting 18psi boost, will see how this goes

[SamSta Member Find all posts View Profile Close SamSta]

I made my own, simple voltage tap with 2 resistors and 2 zener diodes. Clips the signal voltage from the map sensor to 12psi. Works well.

I can make more, if you want one, $50 posted

Hey mate, interested to know more about this device you've thrown together.

Trying to get more power for highway driving and towing. I've installed a 3 bar map sensor and boost controller. Neither of which have helped with highway driving and towing however have made a massive performance improvement with around town driving (which I didn't really need to be honest...). With boost controller wound fully open, I only seem to be getting around 12psi boost? How is everyone else getting 16-17psi + boost??

What improvement towards my needs will your device make?

Cheers

[adrian5800 Advanced Member Find all posts View Profile Close adrian5800]

Hey mate, interested to know more about this device you've thrown together.

Trying to get more power for highway driving and towing. I've installed a 3 bar map sensor and boost controller. Neither of which have helped with highway driving and towing however have made a massive performance improvement with around town driving (which I didn't really need to be honest...). With boost controller wound fully open, I only seem to be getting around 12psi boost? How is everyone else getting 16-17psi + boost??

What improvement towards my needs will your device make?

Cheers

It won't make any difference to your setup as you're only getting 12psi boost anyway. The std 2 bar MAP sensor's signal to the ECU at around 14 psi is at the point the ECU starts to cut fuel, adding a 3 bar MAP as you have will have raised that threshold at the expense of lower boost levels slightly lower fuel injection quantity.
Just adding more boost to a standard 1KZ engine won't achieve much without more fuel, freer flowing exhaust (especially the dump pipe) or other mods.

[SamSta Member Find all posts View Profile Close SamSta]

Thanks for your response.

So if I put the original map sensor back in and a FCD, I would be better off than I am now? As in I would be able to wind my boost up more and the fuelling would increase accordingly?

Sorry for all the questions, I'm playing catch-ups here with all this. Seems everyone else has been through all this 10-15 years ago.

[adrian5800 Advanced Member Find all posts View Profile Close adrian5800]

Thanks for your response.

So if I put the original map sensor back in and a FCD, I would be better off than I am now? As in I would be able to wind my boost up more and the fuelling would increase accordingly?

Sorry for all the questions, I'm playing catch-ups here with all this. Seems everyone else has been through all this 10-15 years ago.

Adding more boost over the standard 10-12 psi won't increase fueling without other mods, you might get more torque if it is way on the rich side of stoichiometric.

[SamSta Member Find all posts View Profile Close SamSta]

Damn... I'm reading so many conflicting views on this. This gentleman (see link below) recommends 3" exhaust + FCD-2 to resolve my problems based on his experience and he says the FCD does allow more fuel based on the lower boost readings being recieved by the ECU. Am I reading that correct or have I misinterpreted what he's saying?

I wasn't entirely convinced on the exhaust recommendation based on conflicting views however I'm starting to come around now and understanding the benefits.

https://youtu.be/NP9R527VvXQ

[carco Advanced Member Find all posts View Profile Close carco]

Your fuel pump has a maximum output set from factory.
Doesn’t matter how much boost you give, the pump can’t supply more fuel than that.
As a safety function, the stock ecu has the 1.0 bar boost limit which an FCD will override allowing you to run more boost than factory until the stock turbo‘s efficiency is exceeded.
But you’re still limited to that factory fuel delivery, unless you have the pump output lifted.
Then your next restriction would be injectors which also have a flow limit.
So by simply increasing boost, your car will feel much more livelier at low/moderate loads where the fuel delivery will be in excess of the factory parameters for that particular load.
But once the car is under full load, that’s all the fuel she’s going to get.