Fuel Cut Defender DIY MIA
01-14-11, 08:27 AM
#1
Rotartist
Thread Starter
iTrader: (13)
Join Date: Sep 2003
Location: Spring Hill TN 37174
Posts: 7,252
Likes: 0
Received 2 Likes
on
2 Posts
Fuel Cut Defender DIY MIA
So back in the day I use to build my own FCDs off the Fc3s.org website... Well the link is dead and I can't remember how to build this thing.. I have searched all over the Googleness and everytime it pops up in any forum it is a link to the dead F3CS.org writeup...
Due to the winter weather I am bored and indoors and would like to make one for the AE while I am all cabinfever infected.
Any active links, pictorials ect would be great...
Due to the winter weather I am bored and indoors and would like to make one for the AE while I am all cabinfever infected.
Any active links, pictorials ect would be great...
01-14-11, 10:26 AM
#2
Now With 10th AE Fun!
iTrader: (1)
Join Date: Jun 2005
Location: CA
Posts: 1,869
Likes: 0
Received 0 Likes
on
0 Posts
Here you go... Yes I am amazing. http://web.archive.org/web/200502052...rical/fcd.html
01-14-11, 02:43 PM
#5
Rotartist
Thread Starter
iTrader: (13)
Join Date: Sep 2003
Location: Spring Hill TN 37174
Posts: 7,252
Likes: 0
Received 2 Likes
on
2 Posts
Here you go... Yes I am amazing. http://web.archive.org/web/200502052...rical/fcd.html
01-14-11, 10:44 PM
#7
Rotartist
Thread Starter
iTrader: (13)
Join Date: Sep 2003
Location: Spring Hill TN 37174
Posts: 7,252
Likes: 0
Received 2 Likes
on
2 Posts
Upgrading fuel injectors ect doesnt help much without an ECU upgrade..
The FCD when used properly on a mildly modified car is cheap and easy insurance. For someone with a turbo/exhaust upgrade it is a wise modification.
My car has a S5 turbo, and a 3" Downpipe and Midpipe with Cat delete, doesnt exactly merit a full ECU/fuel upgrade.
The FCD when used properly on a mildly modified car is cheap and easy insurance. For someone with a turbo/exhaust upgrade it is a wise modification.
My car has a S5 turbo, and a 3" Downpipe and Midpipe with Cat delete, doesnt exactly merit a full ECU/fuel upgrade.
Trending Topics
01-15-11, 04:15 AM
#9
Senior Member
I dont call it a wise mod at all. I only agree with you that it is a cheap solution.
Only thing you do is fooling your car by making it think the intake presure is lower to avoid fuel cut. Fuel cut is there for a reason.
Only thing you do is fooling your car by making it think the intake presure is lower to avoid fuel cut. Fuel cut is there for a reason.
01-15-11, 05:28 AM
#10
^....
ya to prevent the engine from creating more power, lessening the ex. pressure, thus droping boost. but fuel cut can create detonation, and with our fragile apex seals, one det. could
be the last...
copied via Aaroncakes webpage, and what he says, as far as im concerned is GOLD!
Fuel Cut, FCD and Fuel System Modifications
The stock fuel system is programmed to prevent overboosting the car by cutting fuel past about 8.5 PSI. This system is designed to protect the engine and must be defeated if higher then stock boost is run. Fuel cut feels a bit like the car hitting a wall just after 8 PSI. The Fuel Cut Defender (or FCD) is available from most of the vendors (there is also a DIY version) to trick the ECU into thinking that the car is running less then 8.5 PSI of boost, thus avoiding fuel cut. However, the FCD does not add more fuel to the engine in response to higher boost. Because of this, just running around with high boost levels and an FCD is a very bad thing and virtually guarantees short engine life. One would hope that there is a special place in hell for those that sell a car with cranked up boost, an FCD and no other supporting fuel mods.
For cars running the stock turbo at less then 10 PSI, a fuel pump is generally all that is required. Cars running more boost and upgraded turbochargers will require larger injectors, an upgraded pump and some way to control all of this. The exact configuration will depend on how the car is setup and there are many, many options. It is most important to verify that at least something has been done to supply the engine with the proper amount of fuel.
More radical modifications will require a complete fuel system upgrade, known as generically as a "standalone" or "standalone EMS". There are many options but most popular are the systems by Haltech, Microtech, Wolf and the Megasquirt. Each of these systems is set up differently and it is beyond the scope of this document to cover them all. However you will want to examine the wiring harness and quality of installation carefully. Is wiring neat and tidy? What is the condition of the connectors? Is everything fused? Beyond that, there is the quality of the tune. Does the car start easily cold or hot? Drive smoothly? Any smoke? It is definitely recommend that if you are not familiar with standalone systems that you seek out someone who is
heres the page:
http://www.aaroncake.net/rx-7/buy2.htm
Fcd's ARE a cheap solution to raise boost and allow for more tuning.
not really sure why ur seeing them as a bad idea, buuut i think you may have been mislead about them
ya to prevent the engine from creating more power, lessening the ex. pressure, thus droping boost. but fuel cut can create detonation, and with our fragile apex seals, one det. could
be the last...
copied via Aaroncakes webpage, and what he says, as far as im concerned is GOLD!
Fuel Cut, FCD and Fuel System Modifications
The stock fuel system is programmed to prevent overboosting the car by cutting fuel past about 8.5 PSI. This system is designed to protect the engine and must be defeated if higher then stock boost is run. Fuel cut feels a bit like the car hitting a wall just after 8 PSI. The Fuel Cut Defender (or FCD) is available from most of the vendors (there is also a DIY version) to trick the ECU into thinking that the car is running less then 8.5 PSI of boost, thus avoiding fuel cut. However, the FCD does not add more fuel to the engine in response to higher boost. Because of this, just running around with high boost levels and an FCD is a very bad thing and virtually guarantees short engine life. One would hope that there is a special place in hell for those that sell a car with cranked up boost, an FCD and no other supporting fuel mods.
For cars running the stock turbo at less then 10 PSI, a fuel pump is generally all that is required. Cars running more boost and upgraded turbochargers will require larger injectors, an upgraded pump and some way to control all of this. The exact configuration will depend on how the car is setup and there are many, many options. It is most important to verify that at least something has been done to supply the engine with the proper amount of fuel.
More radical modifications will require a complete fuel system upgrade, known as generically as a "standalone" or "standalone EMS". There are many options but most popular are the systems by Haltech, Microtech, Wolf and the Megasquirt. Each of these systems is set up differently and it is beyond the scope of this document to cover them all. However you will want to examine the wiring harness and quality of installation carefully. Is wiring neat and tidy? What is the condition of the connectors? Is everything fused? Beyond that, there is the quality of the tune. Does the car start easily cold or hot? Drive smoothly? Any smoke? It is definitely recommend that if you are not familiar with standalone systems that you seek out someone who is
heres the page:
http://www.aaroncake.net/rx-7/buy2.htm
Fcd's ARE a cheap solution to raise boost and allow for more tuning.
not really sure why ur seeing them as a bad idea, buuut i think you may have been mislead about them
01-15-11, 08:13 AM
#11
Senior Member
That is a nice description ROD.
Why i dont like it?
"....However, the FCD does not add more fuel to the engine in response to higher boost....."
That would mean the engine will run lean. Personaly i dont like the fact that my engine runs lean. If i am at 8.5 / 9 psi with fcd i would scratch my head knowing that i am at the edge. But sometimes i also read the combination: boost controller and FCD. And that is something waiting to go wrong if you ask me.
What i always thought was that the stock fuel system can not deliver more fuel and therefore it needs to prevent overboosting with the fuelcut. If this is not true i recommend trying to find a way getting more fuel delivered in combination with an FCD.
Why i dont like it?
"....However, the FCD does not add more fuel to the engine in response to higher boost....."
That would mean the engine will run lean. Personaly i dont like the fact that my engine runs lean. If i am at 8.5 / 9 psi with fcd i would scratch my head knowing that i am at the edge. But sometimes i also read the combination: boost controller and FCD. And that is something waiting to go wrong if you ask me.
What i always thought was that the stock fuel system can not deliver more fuel and therefore it needs to prevent overboosting with the fuelcut. If this is not true i recommend trying to find a way getting more fuel delivered in combination with an FCD.
01-17-11, 01:56 AM
#12
im not arguing that more boost on a stock system will or will not cause lean conditions, we all know it will...
that being said, there are several tuning programs that help with that,
rtek, motec, megasquirt, are all programs that add fuel, in its basic explanation.
i dont know about the others but the rtek comes with FCD wired into the ecu, and works in conjunction with it
im not trying to be an ***, im just wondering if u know that there are tuning systems available for our cars, that eliminate leanout?
an fcd is a essential mod for a semi stock car, running a larger exhaust (possible getting boost creep)
imho fuel cut is FAR more dangerous, then slightly leaning out under boost.
now, having an afr of ~14.whatever at 10-15psi is stupid and someone F-ed up somewhere
but thats why one NEEDS a wideband o2 sensor, boost controller, and some sort of fuel tune, whether it be electronic (piggyback, standalone, or chipped)
or mechanical
either way leaning out is up to the owner to control, and keep in check.
that being said, there are several tuning programs that help with that,
rtek, motec, megasquirt, are all programs that add fuel, in its basic explanation.
i dont know about the others but the rtek comes with FCD wired into the ecu, and works in conjunction with it
im not trying to be an ***, im just wondering if u know that there are tuning systems available for our cars, that eliminate leanout?
an fcd is a essential mod for a semi stock car, running a larger exhaust (possible getting boost creep)
imho fuel cut is FAR more dangerous, then slightly leaning out under boost.
now, having an afr of ~14.whatever at 10-15psi is stupid and someone F-ed up somewhere
but thats why one NEEDS a wideband o2 sensor, boost controller, and some sort of fuel tune, whether it be electronic (piggyback, standalone, or chipped)
or mechanical
either way leaning out is up to the owner to control, and keep in check.
Thread
Thread Starter
Forum
Replies
Last Post
Snook
3rd Generation Specific (1993-2002)
21
09-01-15 06:32 PM
armans
3rd Generation Specific (1993-2002)
5
08-15-15 09:08 PM
